# Questions Asked onApril 7, 2011

1. ## geometry

A triangles shows the altitude qt and pm of triangle pqr. If qr=8cm , pr=7cm and qt=4cm what is pm?

asked by Onile ganiyu lukman
2. ## Physics

a) The x-coordinate of an electron is measured with an uncertainty of 0.20 mm. What is the xcomponent of the electron’s velocity, vx, if the minimum percentage uncertainty in a simultaneous measurement of vx is 1.0%. b) Repeat part (a) for a proton.

asked by B. Ramez
3. ## Chemistry

A 100.0 mL sample of 0.20M HF is titrated with 0.10M KOH. Determine the pH of the solution after the addition of 100.0 mL of KOH. The Ka of HF is 3.5 x 10^-4

4. ## physics

an oil drop has a charge of 8.0 x 10^-19 C. How many excess electrons does the oil drop have?

5. ## Physics

A raindrop (mass 1.00 g) is travelling at a speed of 40m/s when it hits the surface of 100 g of water contained in a drinking glass. What is the change in temperature of the water in the glass if we assume that a) all the kinetic energy of the raindrop is

6. ## PHYSICS

Given: The energy equivalent of one gallon of gasoline is 1.3 × 108 J. A compact car has a mass of 847 kg, and its efficiency is rated at 18.1%. (That is, 18.1% of the input power available is delivered to the wheels.) Find the amount of gasoline used to

7. ## english

find the subject and the predicate in these sentences?????????? 1.There is large envelope on the table. 2.Lend me your dictionary.

8. ## psychology

particular factors encourage people to be drawn into liking one another. in this context the reciprocity of liking effect is primarily associted with? a.) exposure b.)propinquilty c.) similarity d.) physical attractiveness. I think its D but not 100%

asked by alisha s
9. ## psychology

Whether you're persuaded by a message will primarily depend on which factor? a.) your preception understanding of the recipient of the message b.) your characteristics, including your personality and intelligence c.) whether your receive the message while

asked by alisha s
10. ## Physics

A 225 kg box is loaded onto a truck by pulling it up an inclined plane (10 m hypotenuse difference) by a force that is parallel to the incline (T = 315 N). If the bed of the truck is 1.2 m above the ground what is the efficiency of this simple machine in

11. ## psychology

mandy has decided that she has no control over the aversive stimull she encounters at work and at home day by day. thus, she has given up trying to make her life better psychologists would say mandys worldview illustrates a.) emotion-focused coping b.)

asked by alisha s
12. ## science

which typ(s) of RNA is/are involved in protein synthesis?

13. ## Physics

The moment of inertia of a solid uniform sphere of mass M and radius R is given by the equation I=(2/5)MR2 . Such a sphere is released from rest at the top of an inclined plane of height h, length L, and incline angle è. If the sphere rolls down the

14. ## Physics

5. The surface of a glass plate (index of refraction n3 = 1.50) is coated with a transparent thin film (index of refraction n2 = 1.25). A beam of monochromatic light of wavelength 6.0 X 10^-7 meter traveling in air (index of refraction n1 = 1.00) is

15. ## English

Huck struggles to decide what he should do when his heart and his conscience pull him in different directions. He eventually decides to go with his heart. * Write a short essay explaining why you agree or disagree that this was a good strategy for Huck to

16. ## Data Management

This is a hard question as it has a diagram. Basically the diagram states: Victoria - Montreal costs \$580 Victoria - Saskatoon costs \$230 Victoria- Toronto costs \$505 Saskatoon - Toronto costs \$398 Toronto - Charlottetown costs \$395 Toronto - Montreal

17. ## chemistry

which system is under higher pressure, a column of mercury or a column of water

18. ## calculus

determine the dimensions of a rectangular solid (with a square base) with maximum volume if it's surface area is 289 meters

19. ## Chemistry

Draw structural formula for each reaction and state the type of reaction that is occuring: a. 4-nonene and fluorine gas b. hexane and oxygen gas c. pentanol and butanoic acid d. propene and hydrogen gas

20. ## Prob. Math

Sarah draws a card from a deck of 52 cards. She receives 40 cents for a heart, 50 cents for an ace, and 90 cents for the ace of hearts. The cost of a draw is 15 cents. How much will Sarah lose if she plays this game?

21. ## geometry

Find the supplement to the angle whose measure is 85 degrees.

22. ## statistics

A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is 15. a) Compute the 95 % confidence interval for the population mean. b) Assume that the same sample mean was obtained from a sample of 120 items.

23. ## Statistics

If the mean of a set of data is 20.00 and 12.20 has a z-score of -1.30, then the standard deviation must be: What formula would you use to determine this?

24. ## Math

Which statement is always true about a parallelogram? A. It has 4 congruent sides B. It has 4 right angles. C. It has opposite angles that are congruent. D. The sum of any 3 angles is 360 Is it a?

25. ## physics

A wire carries a current north. Above the wire the magnetic field is directed _________. Is it east? You are looking at a coil carrying a current clockwise. The magnetic field at the center of the coil is directed _________. Is it right?

26. ## Physics

An explorer in the dense jungles of equatorial Africa leaves his hut. He takes 43 steps at an angle 45north of east, then 80 steps at an angle 60 north of west, then 51 steps due south. Assume his steps all have equal length. Save him from becoming

27. ## math

A square has symmetry with respect to a line containing a median of the square. True False true?

28. ## Chemistry

A student titrates 0.100M KOH, potassium hydroxide, into 50.0ml of 0.10M HCOOH, formic acid (Ka=1.8 x 10^-4. What is the pH of the mixture after 25.0ml of the KOH has been added

29. ## Chemistry

Determination of the solubility product of PbI2. From the experimental data we obtain [I-] directly. To obtain Ksp for PbI2, we must calculate [Pb2+] in each equilibrium system. This is most easily done by constructing an equilibrium table. We first find

30. ## Physics

The seeing ability, or resolution, of radiation is determined by its wavelength. If size of an atom is of the order of 0.1 nm, how fast must an electron travel to have a wavelength small enough to “see” an atom?

31. ## Chemistry

I can't figure out how to solve this problem: The Ka for hydroflouric acid is 4.5 *10^-4 at 298K. Calculate the amount of sold NaF that is required to prepare a 250. mL acidic buffer with pH = 2.75. The initial molarity of hydroflouric acid is .250M but

32. ## Physics

An 8.5 x 10^2 elevator is pulled up at a constant velocity of 1 m/s by a 10 kW motor. Calculate the efficiency of the motor.

asked by Wendy A.
33. ## English

Urgent! Can someone please look these over? The sentences are very vague (welcome to online schooling, I guess). Some of them are questionable. Please help! Need to write whether the sentence is a "POINT" or "TOPIC" sentence. Point Sentence-Announces the

34. ## 4th grade

The 93 nature camp students ate lunch at the lodge. They sat at an even number of tables. There were 5 students at one table, and an equal number of students sitting at each of the other tables. How many students were sitting at each of the other tables?

35. ## physics

In a scene in an action movie a person is being chased across a roof top. To escape, the person runs off the edge of the building and falls to the roof of a nearby shorter building. The tall building is 50m high, the short building is 40m high and there is

36. ## 5th grade Math

Explain how you can find the product of 5 and 3/4.

37. ## math algebra

factor 20x^3-4x^2-72x

38. ## chemistry

Can someone please explain how to do this question? A 0.057M solution of a weak acid has a pH of 4.93. Determine the ionization constant, Ka, of the acid. a) 2.1 x 10^-4 b) 2.4 x 10^-9 c) 4.1 x 10^-8 d) 2.8 x 10^-7 e) 1.4 x 10^-10 -- Well, to be honest, I

39. ## Language 7

Rewrite the sentences below so that the pronouns match the correct nouns, or change the pronoun so that it matches the right noun or nouns. a) She took the sweater out of the drawer and wrapped it up. b) The ball slowly rolled into the net, but it was

asked by Curly Sue
40. ## Chemistry

A student titrates 0.100M KOH, potassium hydroxide, into 50.0ml of 0.10M HCOOH, formic acid (Ka=1.8 x 10^-4. What is the pH of the mixture after 25.0ml of the KOH has been added

41. ## Geometry

The area of a regular octagon is 25. What is the area of a regular octagon with sides five times as large as the sides of the first octagon?

42. ## chemistry

Write a paragraph explaining how to determine how many hydrogen atoms are in 6.5g of water. No equations are permitted in this answer.

43. ## physcis

A stone is shown at rest on the ground a vector shows the weight of the stone. complete the vector diagram showing another vector that results in zero net force on the stone. b. what is the conventional name of the vector you have drawn

44. ## Physics

A person is jogging at 3.5 m/s and grabs a rope that is hanging vertically from a tree. How high can the student swing?

asked by Wendy A.
45. ## Quantitative methods

the mean and standard deviation of the grades of 500 students who took an maths exam were 69 and 7 respectively. if the grades have a bell shaped distribution, how many of these students received a grade of more than 83 marks?

46. ## English huckleberry finn

The book ends with Huck saying he's going to "light out for the Territory ahead of the rest." But there's a part of me that wonders if he won't decide to go back home to the Widow's with his friends. * Write a short paragraph or two to make another "last"

47. ## statistics

Suppose that A,B and C are mutually exclusively events such that; P(A) =0.3, P(B)=0.1, and P(C)=0.5. Evaluate; P(AuBuC)

48. ## algebra

p(x)=x^3+2x^2-3x+20 one of this functions zeros is -4 When using synthetic division to find all the zeros of a polynomial function, would you plug in 4 or -4 into the actual equation?

49. ## physics

A 15.5-m length of hose is wound around a reel, which is initially at rest. The moment of inertia of the reel is 0.42 kg · m2, and its radius is 0.170 m. When the reel is turning, friction at the axle exerts a torque of magnitude 3.63 N · m on the reel.

50. ## Chemistry

The Ka for hydroflouric acid is 4.5 *10^-4 at 298K. Calculate the amount of sold NaF that is required toprepare a 250. mL acidic buffer with pH = 2.75. The inital molarity of hydroflouric acid is .250M but you have only 75mL.

51. ## statistics

Approximately how many research participants would be required for 80% power for a study using the t test for dependent means (assume a one-tailed hypothesis with an expected medium effect size of .50):

52. ## Chemistry

Tooth enamel is made up of hydroxyapatite, Ca_10(PO_4)_6(OH)_2 or the empirical formula, Ca_5(PO_4)_3(OH). Use the empirical formula for all calculations because stoichiometry plays two significant roles. A. Print the balanced chemical equation for the

53. ## math

A bell rings every 2 hours, a second bell rings every 3 hours, and a third bell rings every 4 hours. If all 3 bells ring at 9:00 AM. , at what time will all 3 bells next ring?

54. ## us history

from fdr's first inaugral speech ,how did he attempt to win the support of the american people for his leadership during the economic crisis of the great depression

55. ## math

At the greenhouse where you work you need to make soil and vermiculite mixtures for potting plants. Flowering bushes need a mixture of 70% soil and 30% vermiculite by volume. About how many buckets of vermiculite should you add to 5 buckets of soil?

56. ## chemistry

If the reaction below proceeds with a 96.8% yield, how many kilograms of CaSO4 are formed when 5.97 kg SO2 reacts with an excess of CaCO3 and O2? 2 CaCO3(s) + 2 SO2(g) + O2(g) 2 CaSO4(g) + 2 CO2(g)

57. ## English

1. A Swiss family were pulling spaghetti off trees. 2. A Swiss family were pulling spaghetti from trees. (Which preposition do we have to use, off or from? Are both OK and the same?

I don't want someone to do this for me-I'm just totally lost and don't even know where to start-I'm totally lost on this one- the earth is surrounded by an electric field with a strenth of 100 N/C at the surface. Its electric properties are the same as a

59. ## logarithms

Please help, im so confused. how would you solve: 2log(subscript6)(4) - (1/3)log(sub6)(8) = log(sub6)(x)

60. ## chemistry

Cobalt-60 is radioactive isotope used to treat cancers. A gamma ray photon emitted by this isotope has an energy of 2.13 x 10—13 J. What is the wavelength of this gamma ray in SI unit?

61. ## US HISTORY

from fdr's first inaugral speech ,how did he attempt to win the support of the american people for his leadership during the economic crisis of the great depression

62. ## Acid/Base

Why is the normal concentration for HCl compared with the Molar Concentration of [H3O+] different? Why is The normal concentration for Acetic acid compared with the Molar Concentration of [H3O+] different?

63. ## Math/Geometry

What are thre 3 figures of a 36 cm 2?

64. ## chemistry

whatspecies are present in kcl

65. ## Math

5 is ___% of 7. a. 714.29 b. 71.43 c. 7.14 d. 0.71 I believe that it looks like that 5=R x 7 R= 5:7 R=0.7142 Is it correct? d ? Thank You

66. ## Chemistry

At which temperature will the following reactions reverse? Use the thermodynamic date provided at the end of the book. a) 2Ca(s) + O2(g) -> 2CaO(s) b) 2CH4(g) + 4 O2(g) -> 2CO2(g) + 4H2O(g)

67. ## Physics

Suppose Fuzzy, a quantum mechanical duck, lives in a world in which h = 2 J.s. Fuzzy has a mass of 2.0 kg and is initially known to be within a region 1.0 m wide. a) What is the minimum uncertainty in his speed? b) Assuming this uncertainty in speed to

68. ## English

Explain how Tom Joad's imprisonment affect the way he behaved during the journey and throughout his search for work in California.

69. ## calculus

find the derivative f(x)= e^1/x^2ãx

70. ## accounting

Dsoft manufactures PC’s. The company’s Notebook Division reports the following results for the current year: Sales Revenue \$2,000,000 Operating Income \$500,000 Average Operating Assets \$5,000,000 Dsoft’s management’s required rate of return on

71. ## physics

Electrons in a beam incident on a crystal at an angle of 300 have kinetic energies ranging from zero to a maximum of 5500 eV. The crystal has a grating space d=0.5A0, and the reflected electrons are passed through a slit .Find the velocities of the

72. ## precalc

Find the equation of the parabola: x^(2)+4x = y-8

73. ## MATH

Without writing them all out, what is the number of subsets of set A ={king, queen, knight, prince, princess, duke, earl}?

74. ## English

Explain how Tom Joad's imprisonment affect the way he behaved during the journey and throughout his search for work in California.

75. ## math

At the end of an basketball game daniels couch told him he scored 20% of all of his teams points. If Daniel scored 19 points exactly how many points did his team score?

76. ## social studies 8th grade

what are the factors of industrial development

77. ## Dante's Infero/Kwami KiIlpatrick

So, for a project I'm doing. We're reading dante's inferno right now in English and we got a project to pick any person on the planet and put them in Hell, and to decribe the level they'd be on and why. I'm having trouble picking the Level of Hell to put

78. ## Math

the concentration of a certain substance in our organism is given by the model Q9t) = Q(subscript 0) e^-0.1960t a) what quantity of substance is present in the organism of this individual 3 hours after ingestion? b) after how many hours will there only be

79. ## precalc

solve the system of equations: x^(2)+y^(2) = 12 xy = -4

80. ## MATH

Region A that on xy-plane is bounded by two (2) curves and a line. The curves are y=x^3-2x+3 and y=-x^2+3 while the line is x=0. It is located in the first quadrant of xy-plane. Determine the area of region A.

81. ## precalc

What are parametric equations? How would you find the rectangular eq's when given parametric eq's? and how would you find parametric eq's when given rectangular eq's? for example, given x=cos4t and y=sin4t (t is between 0 and 2pi) what is the retangular

82. ## math

i never can do word problems....please help... i got 7 of them.....these are word for word 1) Larry is 8 yrs older than his sister.In 3 yrs, hr will be twice as old as she will be then.how old is each now? 2) Jennifer is 6 yrs older than Sue. in 4 yrs, she

83. ## com220

identify the legislation that you think is linked to the issue

84. ## math

The ratio of the number of postcards john had to the number of postcards Zachary ha d was 4:9. Zachary had 45 more postcards than John. After giving some postcards to John, Zachary had 6/7 as many postcards as John. (A) How many postcards did Zachary have

85. ## sociology

Is this statement correct as a social structure? Based on the Durkheim’s theory of social structure, this best matches who I am as a person and as part of a group. According to Durkheim’s theory, my social structure is based on the groups that one

86. ## social studies

The Calvinists also believed that ? should not control their church,but that the congregation should choose their leaders.

87. ## math

how do you make 25 1/3, 25 1/7 and 7 4/5 into a decimal? thank you

88. ## physics urgent!!!

A canoe of mass 70 kg with a paddler of mass 55 kg are in a river. If the river's current exerts a force of 15 N [E] while the paddler is paddling with an average force of 22 N [N38degreesW], find the acceleration of the canoe and paddler. Use both a

89. ## algebra

(1/(1+x))+(1/x) Factor

90. ## Math

The product of two numbers is 108, and the quotient is 12. What are the two numbers.

91. ## calculus

find ds/dt at (2,1) given t6(2)-2ts+s^(2)=s possible choices are -2/3, 2/3, -3/2 or 3/2

92. ## physics

I need help confirming my answers: 1) The work done on an electric charge equals a) IR b)q/t c)Vq d) It I think it's C.(Vq) 2) The direction of an electric field is the direction that a ___ test charge will move when placed in the field. a)negative b)

93. ## mmh

wats xsquared-13x+36=0

94. ## Math

Akira is selling raffle tickets to raise money for the school band. The odds aginst winning a prize in the raffle are 9:1. What is the decimal probability of winning a prize?

95. ## 4th grade math

explain why it can be better to use compatible numbers to estimate rather than rounding.

96. ## Physics

A 65kg boy and his 40kg sister, both wearing roller blades, face each other at rest. The girl pushes the boy hard, sending him backwards with a velocity of 2.9m/s towards the west. Ignore friction. What is the minimum amount of chemical energy is converted

97. ## geometry

Suppose a triangle has side lengths of 6, 7, and 10. What best describes it? Acute, right, obtuse, or not enough information?

98. ## 9th grade math word problems

i never can do word problems....please help... i got 7 of them.....these are word for word 1) Larry is 8 yrs older than his sister.In 3 yrs, hr will be twice as old as she will be then.how old is each now? 2) Jennifer is 6 yrs older than Sue. in 4 yrs, she

99. ## nutrtion

Create a 6-slide Microsoft® PowerPoint® presentation, including speaker notes, tracing the nutrition needs of both a man and a woman throughout the various stages of life. Be sure to address what their nutritional needs are: o As infants o As teenagers o

100. ## math

The ratio of the number of postcards john had to the number of postcards Zachary ha d was 4:9. Zachary had 45 more postcards than John. After giving some postcards to John, Zachary had 6/7 as many postcards as John. (A) How many postcards did Zachary have

101. ## Social Studies

Hi I need some notes on how The Castle is an australian icon. I have tried and tried but my computer is mucking up!

102. ## physics

you are given the formula d=30-q. use it to find a formula for q using d.

103. ## Prob. Math

Two teams have played each other 14 times. Team A won 9 games and team B won 5 games. Bob offers to bet \$6 on team A winning while you bet \$4 on team B winning. The winner gets \$10. How much money should you expect to lose on such a bet? (Round to the

104. ## grammar

Can you say that someone felt as congruent as they felt before?

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such

106. ## 8th grade math

The Exotic Pets Club has 23 members, all of whom have a snake, an iguana, or a tarantual. Four members have all three kinds of pets. Ten members have a snake, 14 have iguanas, and 13 have tarantulas. Two have a snake and an iguana, three have an iguana and

107. ## physics

A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 25.0° and the angle of refraction is 14.0°, find the critical angle for the liquid when surrounded by air. im not sure how to start this problem.

108. ## fractions

Rida has 32 pages to read for homework, she read 5/8 pages then took a break. She read another 5 2/3 after dinner. How many pages does she have to read?

asked by ken robertson jr
109. ## science physics

describewhat is an importance of microscope to mankind it's urgent please help?

110. ## Chemistry

Find the Ph: of 7.01 x 10-5 M Ba(OH)2 thanks:)

111. ## english

When should I use a comma in a sentence.

112. ## physics

alpha particles are accelerated through a potential of 1000volts and then enter a magnetic field 0.2T perpendicular to the their direction of motion.Calculate the radius of the circular path that they traverse.An alpha particle has a mass 6.68x 10^-27kg

113. ## math

A company with 364 employees increases its workforce to 455. What is the percent increases in the workforce?

114. ## physics

The potential difference applied to an X-ray tube is 5 kV and the current through it is 3.2 mA. Then the number of electrons striking the target per second and speed at which they strike?

115. ## math

230 divided by 2634

116. ## Math

Can a golden rectangle have a shorter base than height? I'm not sure how to answer this can you please help :)

117. ## pys202

Contrast 2 theories or perspectives from the late stage adult development?

118. ## sociology

Does Emile Durkheim theory of social structure have anything to do with a person veiwing their family closeness as being the primary group that matches that person social structure?

119. ## English

What are the steps for editing?

120. ## biology

You are gardening and accidentally puncture your arm with a nail that was in the soil. No significant occurred but your arm was swollen. Recall that soil contains many microorganisms that could be pathogenic. Describe in detail the nonspecific and specific

121. ## chemistry

If 448 L of ethene gas are reacted with excess water at STP, how many grams of ethanol will be produced?

122. ## Math

The perimeter of two equalater triangles are in ration 2:3. If the perimeter of the smaller triangle is 16 cm what is the measure of a side of the larger triangle?

123. ## chemistry

how much heat is absorbed when 500.g of copper goes from 25.0 celcius to 35.0 celcius?

124. ## chemistry

Hello! Please correct me if I'm wrong. For the following compound, predict whether the solution is acidic, basic, or neutral and why: NH4Cl. a) acidic, NH4Cl is the salt of a weak base b) neutral because there is no hydrolysis c) acidic, NH4Cl is a strong

125. ## Maths

A swing 5 metres long swings through a vertical angle of 50 degrees. Through what vertical distance does the seat rise in going from its lowest position to its highest?

126. ## science

Why isn't heat matter

127. ## chemistry

Hello! Can someone please tell me if I am wrong here? For a reaction where rate = k (A)(B)^2, what factor will NOT change k? a) raising the temperature b) increasing concentration of A c) adding a catalyst d) none of these e) lowering the temperature -- I

128. ## Trigonometry

cos(54º-X)=sin2X

(3+ab)(7-ab)

130. ## Trigonometry

If 13 sin x + 5= 0 and x є (0º; 270º) calculate the sum of 2x

131. ## word problems

I can never do word problems...please help!!!! Larry is 8 yrs older than his sister.In 3 yrs, hr will be twice as old as she will be then.how old is each now?

132. ## Trigonometry

Proof the identity 1 + sin 2x/cos 2x = cos x + sin x/ cos x - sin x

133. ## Science

If the volume of air at 23 Degrees C and at 710 mm Hg is 100 mL, calculate the volume at 25 Degrees C and 760 mm Hg.

134. ## health, safety and nutrition

Following the nutritional label on a jar of peanut butter, you determine that 1 ounce of the peanut butter contains 115 calories and 9 grams of fat. what percent of the calories come from that?

135. ## English

1. A Swiss family in the country were pulling spaghetti off trees. 2. A Swiss family in the country were pulling spaghetti from trees. (Can we use 'from' instead of 'off'? Are both sentences the same? What is the part of speech of 'Swiss' in the sentences?

136. ## Math

Rename each mixed number in simplest term 1.1 7/5 2.5 10/6

137. ## Precal grade 11

If 3 is one root of 2x^2 + bx + 3 =0 find the other root and the value of b. The answers are r2=1/2 and b=-7 but i don't know how to get those.

138. ## Physics

In one section of the pool, there is a thin film of oil on the surface of the water. The thickness of the film is 1.0 X l0^-7 meter and the index of refraction of the oil is 1.5. The light source is now held in the air and illuminates the film at normal

139. ## english

When should I use a comma in a sentence.

140. ## English

1. The penguins from King George Island flew (for) thousands of miles to South America to spend the winter. (Is 'for' missing before thousands of miles?)

141. ## English

Describe something that has been carefully observed. A flower please.

142. ## geometry

find the area of a pentagon with the co ordinates of A(0,4) B(3,2) C(3,-1) D(-3,-1) E(-3,2)

143. ## Statistics

For a set of data with mean 12 and variance 9, approsimately 68% of the values will fall between 6 to 18. Is the true or false and how do you find the answere?

144. ## Language 7

At one time, he, him, and his were used to represent individuals of either gender, but this practice is no longer acceptable. change the pronouns in these sentences so that both ales and females are represented. a) No one has to stay in his seat after the

asked by Curly Sue
145. ## Physics

Suppose Fuzzy, a quantum mechanical duck, lives in a world in which h = 2π J.s. Fuzzy has a mass of 2.0 kg and is initially known to be within a region 1.0 m wide. a) What is the minimum uncertainty in his speed? b) Assuming this uncertainty in speed to

146. ## Economics

Why is it important for the government to regulate the activities of natural monopolies? Can you name 2 restrictive practices carried out by a company?

147. ## Physics

Electrons in a beam incident on a crystal at an angle of 30ͦ have kinetic energies ranging from zero to a maximum of 5500 eV. The crystal has a grating space d=0.5 Aͦ, and the reflected electrons are passed through a slit .Find the velocities of the

148. ## college chem

a. According to the Henderson-Hasselbalch equation, how many grams of sodium acetate will you need to add to 125 mL of 0.100 M acetic acid to make a pH=4.74 buffer? b. What is the actual pH of the resulting buffer when you add that many grams of sodium

149. ## 8th grade math

How do you determine if a relationship's linear using a equation?

asked by Alaura Amanda
150. ## introduction to accounting

a merchandising company wants to include the cost of operating its warehouse in the cost of inventory. The company’s controller argues that the cost of the warehouse is a reasonable and necessary cost of getting the inventory ready for sale and,

151. ## 4th grade math

marco:87 bridget:95 erin:93 jinwon:910 david:94 describe how a bar graph could illustrate the test scores.

152. ## algebra

perform the indicated operation and simplify013/18 /20/27

153. ## Science

Hi, I asked this question earlier, but didn't get any replies. If anybody could help, it would be extremely appreciated! A 225 kg box is loaded onto a truck by pulling it up an inclined plane (10 m hypotenuse difference) by a force that is parallel to the

154. ## calculus

Let f (x) = 5 - x/2. What is the value of the Riemann sum R(f ,0,8), obtained by using four rectangles and left-hand endpoints?

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such

156. ## geometry

Find the volume of a rectangular solid with the following dimensions: 2ã3 cm x 7ã5 cm x 4ã6 cm.

157. ## Chenistry

If 1.55g of ptassiumhydroxide is dissolved in 20ml of water, what is the expected temperature change for water?

158. ## English

Can you please check these sentences for me, please? It's urgent. 1) What do you think about going to the cinema? How about meeting at school? 2) How do I arrive at the school? I put the clothes back in the wardrobe. I put (is "take") the rubbish out once

159. ## calculus

The approximation to the area under the graph of the function f(x)= 1/(1+x^2) on the interval [-1,1], using four rectangles and the midpoint rule is

160. ## History

Why do you think Native Populations were not included in the Democratic process?

161. ## chemistry

What total mass of a 16 gram sample of 60co will remain unchanged after 15.8 years?

162. ## Math

Find the unknown dimension width 5 1/2 ft 3 1/4 ft volume 143 ft3

163. ## English

Thank you very much. I need to wrie instructions of an MP3 player, a video recorder and a CD-player. Could you help me? I included a few more sentences. 1) I must be silent during teachers' explanations. I hang the clothes in the sun so that they get dried

164. ## calculus

For large values of n, the Riemann sum 1/n(sin0 + (pi/2n) + sin(2pi/2n) +sin(3pi/2n)+...sin((n-1)pi/2n)) is an approximation for which of the following integrals?

165. ## PHYSICS

An object undergoes simple harmonic motion. During that motion the object needs 1.1 seconds to reach one point of zero velocity from the previous such point. If the distance between those points is 0.3 m, calculate the period.

166. ## childcare

You're a teacher in an area day care center. Before your children arrive each morning, you set up several areas with a variety of hands-on activities. As each child arrives, he or she chooses an activity that interests him or her. What type of curriculum

167. ## CHEMISTRY HELP!

a. According to the Henderson-Hasselbalch equation, how many grams of sodium acetate will you need to add to 125 mL of 0.100 M acetic acid to make a pH=4.74 buffer? (I found this to be 1.025g) I need help with the rest b. What is the actual pH of the

168. ## statistics

Compute the standard error of the estimate for the data below. X values 3 â€“2 2 5 10 Y values 4 6 â€“2 0 â€“3

169. ## math

what is the correct order from least to greatest: 3/8,0.23, 35%

170. ## childcare

Two-year-old Gerald is starting at your day care center tomorrow. His mother is going back to work for the first time since Gerald was born. You have four groups at the center. In which group should you place Gerald? A. A group of six toddlers B. A group

171. ## physics

i'm in 5th grade and i really need some help. in science, we got this science packet that's really hard. it's really hard. the question is: Jarrod measured the temperatures of two containers of water with two different thermometers. The water in Container

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such

173. ## childcare

6. You've developed a file in which you keep pictures of different colored birds. One day you give the group of pictures to a preschooler and ask him to separate the pictures by color-all red birds in one pile, all blue birds in another pile, and so on. He

174. ## Math

During scuba lessons Sue dove 30 feet. Harriet dove 120 feet, and Kathy dove 90 feet. What integers represent these depths? Order the integers from least to greatest. Is it 30, 90, 120 or is there something else I need to do?

175. ## childcare

7. Questions 7-10 are based on the following scenario: Carlos is playing in the sandbox. Thomas approaches the sandbox, observes Carlos for a moment, then knocks over the bucket Carlos has just filled with sand. Carlos pushes Thomas away saying, "Get out

176. ## English

I forgot to include the following sentences. Thank you 1) Alonso is desperate because he thinks his son had drowned (or is drowned?). 2) Ariel informs Prospero aboutthe plan to kill him. 3) Dr Jekyll believed that man is (or was) a mixture of good and

177. ## childcare

An appropriate science activity for an infant would be A. weighing and measuring other infants. B. planting a flower. C. feeling different textured objects. D. caring for pets of the facility.

178. ## childcare

An inappropriate science activity for a toddler would be A. reporting on the weather. B. caring for pets of the facility. C. planting a flower. D. watching a science show on TV.

179. ## childcare

Children with special needs should A. be directed to lower age-level activities. B. have little interaction with others. C. be directed to appropriate age-level and developmental activities. D. have stricter discipline.

180. ## vocabulary

the greek base ANGI- means: a)gland b)vessel c)bile D)head

181. ## childcare

14. Caregivers shouldn't allow dress-up play with hats when _______ is/are a problem. A. cradle cap B. dandruff C. lice D. psoriasis

182. ## childcare

When working with special needs/learning disabled children, caregivers should A. provide positive role models for them. B. ignore their disabilities. C. try to do as much as possible for them. D. instruct other children to disregard them.

183. ## science

what does the "lac" repressor bind to? lac is in italic

184. ## geometry

a trapezoid has an area of 4 square units and a height of 1 unit what are the possible lengths and bases

185. ## physics

Suppose that 90 g of hot water at a temperature of 75 degrees C is poured into a cavity in a very large block of ice at 0 degrees C. (a) What will be the final temperature of the water in the cavity? (b) What mass of ice must melt in order for the water to

186. ## physics

a climber with a weight of 441 N is held by a belay rope connected to her climbing harness and belay device; the force of the rope on her has a line of action through her center of mass. The indicated angles are θ = 45˚ and φ = 25˚. If her feet are on

187. ## math

cesar bought 2 bags of flower that each weighed a kilogram and another bag that weighed 500 grams.how many grams of flower did he buy?

188. ## math

Katie is on the 15th floor of a building. She throws a ball straight down from the window, which is 220 feet above the ground. How fast must she throw the ball(in feet per second) for it to hit the ground in 3 seconds?

189. ## physics

Two particles, each of mass 6.00 kg and speed 4.67 m/s, travel in opposite directions along parallel lines separated by a distance 4.89 m. What is the magnitude of L, the angular momentum of the two-particle system around a point midway between the two

190. ## IGCSE 9th grade Chemistry

Why do tomatoes ripen faster in a greenhouse?

191. ## Physics Urgent!!

A day on Mars is 24.6 Earth hours long. A year on Mars is 687 Earth days long. How do the angular velocities of Mars’ rotation and orbit compare to the angular velocities of Earth’s rotation and orbit? w(M)/w(E)= and w(My)/w(Ey)= w is what I used to

192. ## language arts

from the following words I got to separate them into 3 groups: omitted syllable, omitted letter, and added syllable. drowned, restaurant, ivory, chocolate, desperate, lightning, adjective, penetrate, aspirin, athletes, identity , sisastrous, ecstatic,

193. ## physics

A 0.203 kg plastic ball moves with a velocity of 0.30 m/s. It collides with a second plastic ball of mass 0.106 kg, which is moving along the same line at a speed of 0.10 m/s. After the collision, both balls continue moving in the same, original direction,

194. ## MATH URGENT!

Madison is standing on the roof of a building that is 350 feet above the floor. She throws a ball straight up with a velocity of 20 feet per second. How long will the ball be in the air before it hits the ground?

195. ## physics

A 0.210 kg plastic ball moves with a velocity of 0.30 m/s. It collides with a second plastic ball of mass 0.109 kg, which is moving along the same line at a speed of 0.10 m/s. After the collision, both balls continue moving in the same, original direction,

196. ## Earth Science

Compare the general temperature and direction of flow of the current that flows off the east coast of the United States with the temperature and direction of flow of the current that flows off the west coast of the United States.

197. ## geometry

Is it possible to construct a triangle using segment lengths of 5, 8, and 2?

198. ## math

From the information given here, determine the 95% confidence interval estimate of the population mean.

199. ## Chemistry

Why do tomatoes grow better in a greenhouse?

200. ## Math

During weeks in a certain flu season, the rate at which the number of cases of influenza per 100,000 people in a country changed could be approximated by I'(t)=3.298e^0.1044t where I is the total number of people per 100,000 who have contracted influenza

201. ## MATH

IF A DOOR MEASURES 42" WIDE BY 84" TALL CAN A TABLE MEASURING 96" IN DIAMETER FIT THROUGH?

202. ## Geometry

An architect is designing a public storage building with 2 different sized storage units the ceilings are 8 feet high in each storage unit a. All storage units have square floors the volume will be 1800 what are the dimensions of each small unit b. The

203. ## social studies

I need a lot of help. Which of the following statements best explains why many believed that Constantinople would be a better seat for the head of the Christian church than was Rome? A. Constantinople was closer to the Holy land B. Rome was remote and

204. ## Physics-Totally lost

I'm totally lost on this one- the earth is surrounded by an electric field with a strenth of 100 N/C at the surface. Its electric properties are the same as a point charge located at its center. How would the gravatational force and electrical force

205. ## poetry

Help with a format to write an essay, in general. Thanks selena

206. ## Quantitative methods

the mean and standard deviation of the grades of 500 students who took an maths exam were 69 and 7 respectively. if the grades have a bell shaped distribution, how many of these students received a grade of more than 83 marks?

207. ## math

A line segment has an endpoint at (3,2). If the midpoint of the line segment is (6.-2), what are the coordinates of the point at the other end of the line segment?

208. ## math urgent!

Tyler is on the 15th floor of a building. She throws a ball straight down from the window, which is 220 feet above the ground. How fast must she throw the ball(in feet per second) for it to hit the ground in 3 seconds?

209. ## Advanced accounting

Up owns 80% of Down. During 2009 Down began selling merchandise to Up at gross profit margin of 20%. Sales by Down to Up for the year totaled \$80,000, of which \$10,000 remain unsold. In 2010 Down sold \$100,000 merchandise to Up at gross margin of 40%.

210. ## PHYSICS

An object is attached to an ideal spring. It undergoes a simple harmonic motion with a total energy of E = 2.2 J. The amplitude of the motion is 0.7 m and the maximum speed of the object is 0.5 m/s. Find the spring constant.

211. ## chemistry

A 6.58g sample of compound was placed in a 12.6 L container. At 25.0*C, the pressure was found to be 0.75 atm. what is this compound?

212. ## Physics...help please!

Unlike a ship, an airplane does not use its rudder to turn. It turns by banking its wings: The lift force , perpendicular to the wings, has horizontal component, which provides the centripetal acceleration for the turn, and a vertical component, which

213. ## chemistry

what is the solubility of potassium nitrate (KNO3) in 100.0g of water at 80.0 degrees celcius?

214. ## social studies

The guild system of the Middle ages is analogous to what current-day organization? A. royal family B. a craft(labor) union C. a farmer's co-op D. a political party

215. ## statistics

Suppose that M and S are two events such that; P(S)=4/32, P(MnS)==3/32 and P(MuS) = 25/32. evaluate P(M)

216. ## Safety

Hi for my safety class I have to do a powerpoint about the risk and hazards in recreational indoor activities. I'm having trouble locating websites about this topic. Any help would be appreciated, thanks!

217. ## statistics

the mean and the standard deviation of the wages of 1000 factory workers are \$20,600 and \$2,400 respectively. if a worker's annual wage is \$20,000, find and interpret the worker's sample z-score.

218. ## social studies

I need a lot of help. Which of the following statements best explains why many believed that Constantinople would be a better seat for the head of the Christian church than was Rome? A. Constantinople was closer to the Holy land B. Rome was remote and

219. ## math

Tasty squares- Fiber-3 grams Oaty bits- Fiber: 10 grams QUESTION You should get 25 grams of fiber a day. How many serving of each cereal would it take to get 25 grams of fiber? Tasty squares 21 serving Oaty bits 15 serving

220. ## math

the pea data is;2,3,4,5,6 and the frequency is ; 7,9,5,3,1 find the mean, median, mode and midrange number of peas per pod

221. ## math

I need help on finding the median for 17,11,13,18,13,21.

222. ## English

What level of take home pay does one need to meet basic needs? to live comfortably? to not have to worry about having enough money? I don't know, like somewhere in the hundred thousands? I don't get this, please help!!!!!

223. ## math

Find the exact value (either decimal or fractional form) of the first term of an arithmetic sequence if the sum of the first 100 terms is 7099.5 and the sum of the next 100 terms is 20799.

224. ## English

What services are available to young people living on their own that would enable them to get by earning less money I don't understand.

find the area of a 30 degree circle r or d. round to the nearist whole number. 1.r=2m 2.r=35in. 3.d=50cm 4.d=10ft. CAN YOU PLEASE HELP ME!!!!!!!!!

226. ## Physics

If the expression for a given vector is Vector A-Vector B=(4-5)i^+(3+2)j^ and the magnitude of the difference of the vector is equal to 5.1. What is the direction of the difference Vector A - Vector B. (in the counterclockwise and +x direction)

227. ## chemestry

true or false the equivalence point is the point at which a neutraliztion reaction has occured

228. ## english

I need help on writing an essay on how entrepreneurship affects me

229. ## social studies

The Magna Carta did which of the following? A. ended the institution of slavery in Europe B. provided all British males the right to vote C. strengthened the british monarch D. lessened the kings power with respect to aristocracy I think its d.

230. ## Buisness Law

What is the function of a negotiable instrument? Describe the essential elements of a negotiable instrument.

231. ## physics

if you have an element that starts out at 40g and has a half-life of 10 days, you keep it for 30 days- how much doe you end up with? .

232. ## social studies

The samurai of Japan were analogous to what European class of people? A. serfs B. slaves C. nobility D. monarchs I think the answer is c.

233. ## physics

alpha particles are accelerated through a potential of 1000volts and then enter a magnetic field 0.2T perpendicular to the their direction of motion.Calculate the radius of the circular path that they traverse.An alpha particle has a mass 6.68x 10^-27kg

234. ## social studies

which of the following best accounts for the success of the african empires in the 10th through 15th centuries? A. location on the silk road trade route B. the christianization of that area C. the presence of gold and precious metals D. technological and

235. ## geometry

IN this triangle, R=8ã2 what is the value of P

236. ## mathematics

hence calculate the value of x if the area is 25cm2

237. ## math

The weekly take-home pay (in dollars) for 20 graduate teaching assistants at University Z is as follows: 500.75,217.43,488.25,405.78 485.46,495.48,370.75,435.40 479.65,482.56,470.28,489.90 382.50,500.75,465.32,481.25 506.43,225.50,504.38,179.25 Find the

238. ## physics

A canoe of mass 70 kg with a paddler of mass 55 kg are in a river. If the river's current exerts a force of 15 N [E] while the paddler is paddling with an average force of 22 N [N38degreesW], find the acceleration of the canoe and paddler. Use both a

239. ## math

25 pea pods were broken apart and the number of peas in each pod recorded. The record looked as follows: # peas in pod; 2,3,4,5,6 and frequency; 7,9,5,3,1 Make a histogram for this data, does this data appear to be skewed? What is the model class for this

240. ## calculus

suppose a price-demand function p(x) is defined implicitly by x= p^3-3p^2+200 find p'.

241. ## Geometry

In Circle A, AB=12 and measure of angle BAC= 60. Find the lenght of Arc BC

242. ## Chemistry

I did an experiment using 20ml of 0.1M acetic acid and added 8ml of 0.1M NaOH. pH obtained after adding NaOH was 5.2. How do i calculate the mols of NaOH that reacted? mols of acetate formed, acetic acid initially present and acetic acid unreacted. Also

243. ## chemistry

1 ) A sample of vapor occupies a volume of 125 ml at 100 celcius and 748 torr. What is its volume under STP conditions? 2) A sample of vapor weighing 0.745 g filled a 250 ml flask when placed in a water bath at 98 degree celcius. The barometric presure

asked by mark matat
244. ## Biology . Ahh , help me with this question please

summarize how unicellular organisms may have given rise to the first animals ? Please , & thank you(:

245. ## english

choose the subject and the predicate in these sentences????? 1.There is someone at the door. 2.Have a good time at the fair. 3.Go to your room. 4.Get the grocery at the ones. 5.Yesterday there was a full moon in the sky. 6.There are row of plants on either

246. ## Math 7th

In order to be allowed to go on a does trip, 80% of the students in a class must pads a pop quiz. If there are 26 students in the class. Approximately how many must pass the quiz?

247. ## chemistry

i start with 10 g of zinc. I have 12.5 mass of oxide formed. How the reaction will increase

Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such

249. ## Math 7th

In order to be allowed to go on a does trip, 80% of the students in a class must pads a pop quiz. If there are 26 students in the class. Approximately how many must pass the quiz?

250. ## physics

what is 2 meters long or 2 meters high that you can find in a home

251. ## calculus

find the derivative f(x)= 8ln(x^5-2x)

252. ## Geometry

In the accompanying diagram, ABC and AB are congruent to BC. If the coordinates of C are (2,3) and the coordinates of B are (0,0), find the coordinates of A.

253. ## math

2) A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance.

254. ## social studies

What are a few early motions towards the abolition of slavery

255. ## physics ( help)

A large (15kg) holiday decoration is suspended on either side of Hay Street in Perth by two cables stretching between buildings. The length of the first cable is 8m, the second is 6m and the buildings are 12m apart. The 8m rope hangs at an angle 26.4°

256. ## Goverment

I have a question about my homework. Alright here it is........................ I live in Downingtown Pennsylvania My question is who runs the municipal goverment? Hope u can answer it!:)

257. ## Math

What is the perimeter of a rhombus with sides each 9 inches long?

258. ## calculus

what is the integral of [e^(11x)]/[e^(11x)+8]

259. ## gen chemistry

How mucn 0.6 M barium chloride solution would be needed to completely react with 150mL of a 1.4 M sodium solution

260. ## physics

An engine provides a 10kw of power to lift a heavy load at a constant velocity a distance 20m in 5s. what is the mass of the object being lifted?

261. ## calculus

how do you set up the volume of the region bounded by y=x and y=x^2 rotated about the line y=3.

262. ## logarithmic functions

log(subscript 2)(0.5) I know how to convert it into: 0.5 = 2^(y) but then how do I find y?

263. ## economics

how would you illustrate the impact of each of the following events on a production possibilities curve for factory goods and farm goods? a.) the computer in invented b.)1 million farm workers remain unemployed for six months c.) a drought

264. ## Chemistry

Silver ion reacts with excess CN- to form a colorless complex ion,Ag(CN)2 , which has a formation constant Kf = 3.0*10^20 . Calculate the concentration of [Ag] in a solution prepared by mixing equal volumes of 1.8×10−3m NaNO3 and 0.20M NaCN. When I did

265. ## chemistry

If you have 200. mL of a 0.50 M solution of KOH and you wish to dilute it to 0.30 M, how many mL of water should you add?

266. ## trig

find the period and amplitude of each sine function.then sketch each function from 0 to 2pi: 1)y=-3.5 sin 5theta

267. ## geomatry

two similar plygons have a similarity ratio of 4 to 5 the larger polygon has an area of 700 cm2 what is the area of the smaller polygon

268. ## geometry

For Chapeter 10. Section 7 in the workbook how would you work those problems because I have been looking at the tips in the book that explains what to do but as I try to apply those methods my answer seems to get tangled up from the way in the actual book?

269. ## geometry

what measure of an exterior angle of a hexagon? a)45 B)60 C)120 D)150

270. ## geometry

the widthe width of a rectangle is 6 inches less than the length. the perimeter is 72 inches. find the lengtj and the width

271. ## math

The Fred Hartman Bridge allows Texas State Road 146 to cross the Houston ship channel. The bridge is 0.237 mile long. How many feet long is the bridge?

272. ## math

A bell rings every 2 hours, a second bell rings every 3 hours, and a third bell rings every 4 hours. If all 3 bells ring at 9:00 AM. , at what time will all 3 bells next ring?