# Questions Asked onMarch 3, 2013

1. ## Physics

A 20 kg crate is placed on a horizontal conveyor belt. The materials are such that us = 0.47 and uk = 0.21. What is the maximum acceleration the belt can have without the crate slipping? If acceleration of the belt exceeds the value determined in part A,

2. ## Physics

A 23 kg child goes down a straight slide inclined 38 degrees above horizontal. The child is acted on by his weight, the normal force from the slide, and kinetic friction.

3. ## physics

How would the force of gravity between two masses be affected if the separation distance between them were the following? (Assume F2 represents the new force and F1 represents the original force.) (a) triple the original distance F2 / F1 = (b) one-fourth

4. ## physics

two point charges q1=3uc and q2=-2uc are placed 5 cm apart on the x asix. at what points along the x asix in a) the electric field zero and b) the potential zero ?

5. ## Math for Ms. Sue please! Last math questions!

For numbers 1–3, find the indicated measurement of the figure described. Use 3.14 for pi and round to the nearest tenth. Find the surface area of a sphere with a radius of 8 cm. 267.9 cm^2 803.8 cm^2 2143.6 cm^2 201.0 cm^2 Find the surface area of a

6. ## science

a river does 6500J of work on a water wheel every second.The wheels efficiency is 12 percent.A)How much work in joules can the axle of the wheel do in a second? B)What is the power output of the wheel?

1. If the surface area of a cube is 294 inches squared, find the volume. 2. If the base of a prism is an equilateral triangle with sides 8cm, and each lateral edge measures 10cm, what is the volume of the prism.

8. ## Chemistry

if the mole fractionof sulfuric acid (H2SO4) in an aqueous solitioin is 0.325, what is the percent by mass of H2SO4?

9. ## math

A flagpole and a building stands on the same horizontal level.From the point P at the bottom of the building.the angle of elevation of the top T of the flagpole is 65 degrees from the top Q of the building the angle of elevation of the point T is 25

10. ## English

June Walters, along with her friend, __________ baked some delicious cakes. A.have B.has C.have been D.haven't I think it is B...A sounds better but I think it is A...?

11. ## math

Under normal circumstances 1.5 feet of snow will melt into 2 inches of water. After a recent snowstorm, there were 3.5 feet of snow. How many inches of water will there be when the snow melts.

12. ## Physics

Assume that in interstellar space the distance between two electrons is about 0.87 cm. The electric force between them are repulsive. Calculate the electric force between these two electrons. The value of the Coulomb constant 9 × 109 N · m2/C2 and the

13. ## Chemistry

An equilibrium mixture contains 0.250 mol of each of the products (carbon dioxide and hydrogen gas) and 0.200 mol of each of the reactants (carbon monoxide and water vapor) in a 1.00-L container. CO(g) + H2O(g) CO2(g)+ H2(g) How many moles of carbon

14. ## probability

the probability of drawing a club from a deck of card is 1/4 what are the odds in favor of drawing a club from an ordinary deck of cards?

15. ## Chemistry

What is the expected mass of anhydrous salt formed after the waters of hydration of CoCl2·6H2O are driven off completely by heating, resulting in a mass loss of 2.000 g water?

16. ## physics

If a 0.50-kg block initially at rest on a frictionless, horizontal surface is acted upon by a force of 5.7 N for a distance of 8.6 m, then what would be the block's velocity?

17. ## chemistry

If 5.30mL of 0.1000 M NaOH solution is needed to just neutralize excess acid after 20.00 mL of 0.1000 M HCl was added to 1.00 g of an antacid, how many moles of acid can the antacid counteract per gram?

18. ## Chemistry

Find the pH of a buffer that consists of 0.82 M methylamin (CH3NH2) and 0.71 M CH3NH3Cl (pKb of methylamine (CH3NH2) = 3.35.) I keep getting 3.41, but it says that it's wrong...

19. ## English

A team of explorers ___________ the ocean floor. A.were studying B.are studying C.have been studying D.has been studying I think it is D...?

20. ## math

If a person draws two cards from a standard deck (without replacing them), what is the probability that at least one of the cards is a face card? (Round your answer to one decimal place.)

21. ## Chemistry

Sodium azide (NaN3) yields N2 gas when heated to 300 degrees Celsius , a reaction used in automobile airbags. If 1.00 mol of N2 has a volume of 47.0 liters under the reaction conditions , how many liters of gas can be formed by heating 35g of NaN3? The

22. ## STAT

Calculate SP (the sum of products of deviations) for the following scores. Note: Both means are decimal values, so the computational formula works well. X Y 0 2 0 1 1 0 2 1 1 2 0 3 Assume a two-tailed test with  .05. (Note: The table does not list all the

23. ## calculus

At 9am, ship B was 65 miles due east of another ship, A. Ship B was then sailing due west at 10 miles per hour, and A was sailing due south at 15 miles per hour. If they continue their respective courses, when will they be nearest one another?

24. ## math

convert the credit card rate to APR Oregon, 2 1/4% per month

25. ## Physics

A 6 uF capacitor is initially charged to 100V and then connected across a 600 ohm resistor. a) what is the initial charge on the capacitor?

26. ## sciences

how high will a body rise that is projected vertically upward with a speed of 100 ft/s how long will it will take a body to reach its maximum height?

27. ## Physics

In unit-vector notation, what is the torque about the origin on a particle located at coordinates (0, -2.24 m, 9.78 m) due to (a) force 1 with components F1x = 2.70 N and F1y = F1z = 0, and (b) force 2 with components F2x = 0, F2y = 2.92 N, F2z = 4.02 N?

28. ## finding present value

Achieve 225,500 at 8/85% compounded continuously for 8 years, 125 days

29. ## math

A bag contains 44 U.S. quarters and six Canadian quarters. (The coins are identical in size.) If seven quarters are randomly picked from the bag, what is the probability of getting at least one Canadian quarter? (Round your answer to one decimal place.)

30. ## Statistics

The heights of young women are approximately normally distributed with a mean of 64.5 inches and a standard deviation of 2.5 inches. Determine the following: what percent of young women would be acceptable as members if being a member required a height of

31. ## Physics

500 calories of heat is added to 2.0 g of water at 80 degrees Celsius. How much steam is produced?

32. ## chemistry

C2H6 + O2 -> CO2 + H2O How many g of carbon dioxide are produced at the same time as 360g of water vapor in the burning of ethane

33. ## math

A planned community has 300 homes, each with an automatic garage door opener. The door opener has eight switches that a homeowner can set to 0 or 1. For example, a door opener code might be 01100101. Assuming all the homes in the community are sold, what

34. ## physics

A carnival ride has a radius of 2.18 m and rotates once every 0.82 sec. What would the speed of a rider be that has been flung from the ride? What would be the angular speed of a second rider !@#\$%^&mains on the ride?

35. ## Physics

A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1390 Hz. The bird-watcher, however, hears a frequency of 1430 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?

36. ## Chemistry

Calculate the pH of 0.215 M carbonic acid (H2CO3). (HINT: do NOT worry about the second H+ in this acid!) How would I solve this?

37. ## science

Q: which of these conditions is least likely to cause a species to become extinct due to environmental changes? A: -less genetic variation -more genetic variation -specific food preferences -more competition for food

38. ## chemistry

a solution is made that is 1.5X10^-3M in Zn(NO3)2 and 0.130 M in NH3. the Kf for Zn(NH3)4^2+ is 2.0X10^9

39. ## Math

A pyramid has a height of 5 in. and a surface area of 90 in^2. Find the surface area of a similar pyramid with a height of 10 in. Round to the nearest tenth, if necessary. 360 in^2 180 in^2 22.5 in^2 3.6 in^2

40. ## Trig

help please!: (sinx + sin2x +sin3x) / (cosx + cos2x + cos3x) = tan2x

41. ## Physics

The distance between a loudspeaker and the left ear of a listener is 2.19 m. (a) Calculate the time required for sound to travel this distance taking the speed of sound to be 343 m/s. (b) Assuming that the sound frequency is 525 Hz, how many wavelengths of

42. ## Emergency help

let A={12, 13, 14,15,16,18 } what is the subset of a A has how many subset B has ------ subset

43. ## Chemistry

What is the mass of gas dissolved in a solution at 150kPa if 0.35g of the gas dissolves in 2.0L of water at 30kPa?

44. ## Chemistry II

Saw this one already answered, but did not understand at all... Calculate the delta Hf of C6H12O6 (s) from the following data: Delta H combustion= -2816 kj/mol delta Hf of Co2 = -393.5 kj/mol delta Hf= of H2 O= -285.9kj/mol

45. ## Chemistry

How many grams of carbon are in 4.30×1023 molecules of (C3H5)2S?

46. ## Chemistry

Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) PCl3(g)+Cl2(g) Kc=1.80 at 250 degrees Celsius A 0.222 mol sample of PCl5(g) is injected into an empty 3.25 L reaction vessel held at 250 °C. Calculate the concentrations of

47. ## holy school

CaCO3 + H2 SO4 ------> CaSO4 + CO2 + H2 O 200 g of calcium carbonate are added to 4 L of water. a. What is the molarity of the calcium carbonate solution? b. How many moles of hydrogen sulfate would be needed to react with a 25 mL sample of the calcium

48. ## chemistry

A lab technician determines the boiling point elevation of an aqueous solution of a nonvolatile, nonelectrolyte to be 1.62°C. What is the solution's molality?

49. ## Chem

At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.200 M and [NO]=0.500 M. N2(g) + 02(g) 2NO(g) If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is

50. ## algebra

A car is stopped at a traffic light. The light changes to green and the driver starts to drive, accelerating at a rate of 4 m/s^2. Write an equation for the distance the car travels in time.

51. ## maths

find the first 3 terms in the expansion of (x+4)(1+3x)^-2 as a series in ascending powers. I expanded the second bracket using binomial expansion and got 1 -6x +27x^2 -108x^3 how do I combine (x+4) with the expansion? Any help would be appreciated.

52. ## Chemistry

Consider the isomerization equlibria of an alkene (C4H8) that co-exists as three isomers. (These 3 are in an equlibrium triangle) Reaction 1: cis-2-butene ⇔ trans-2-butene Reaction 2: cis-2-butene ⇔ 2-methylpropene Reaction 3: trans-2-butene ⇔

53. ## Physics

Two out-of-tune flutes play the same note. One produces a tone that has a frequency of 242 Hz, while the other produces 288 Hz. When a tuning fork is sounded together with the 242-Hz tone, a beat frequency of 26.0 Hz is produced. When the same tuning fork

Q: a species of rodent lives in a moist forest. over time, the climate changes and becomes drier and more desert-like. which of these adaptations is most likely to improve the chances that the species will survive as its environment changes? Answer

55. ## Chemistry

50 mL of copper(II) sulfate reacts with 50 mL of sodium hydroxide. Their concentrations are 0.3 M and 0.6 M respectively. The temperature increased to 23.6 C from 23.4 C. Determine the enthalpy change for the reaction in kJ/mol of sodium hydroxide. Q=mcΔT

56. ## Physics

A woman is standing in the ocean, and she notices that after a wave crest passes by, five more crests pass in a time of 68.0 s. The distance between two successive crests is 34.1 m. What is the wave's (a) period, (b) frequency, (c) wavelength, and (d)

57. ## math

A box contains four red, three blue, and six green lenses. Two lenses are randomly selected from the box. Find the probability of getting two red lenses when two are selected if the first selection is NOT replaced before the second selection is made.

58. ## maths-perimeter

A circular pond has a 95cm wide foot path along the edge.A man walks around theouter edge of te footpath of 55cm long steps.In 640 steps he makes a full round.What is the radius of the pond

59. ## Physics

A specimen has .625 the amount of carbon 14 you would find in a living specimen. How many half-lives has the specimen been through? How old is the specimen?

60. ## maths

A lighthouse is 9.6 nautical miles from a ship which bears 156 degrees from the lighthouse.How far is the ship east of the lighthouse?Give answer correct to one-tenth of a nautical mile.

61. ## Physics

A string is fixed at both ends and vibrating at 120 Hz, which is its third harmonic frequency. The linear density of the string is 4.9x10-3 kg/m, and it is under a tension of 3.6 N. Determine the length of the string.

62. ## physical science

1. Boyle’s law states that if you squeeze a fixed amount of a gas into a smaller volume, the pressure will increase. Explain why in your own words.

63. ## Math 208

Rectangle Dimensions: The length of a rectangle is 7 inches longer than the width. If the perimeter of the rectangle is 62 inches, find the measures of the length and width.

64. ## math

one out of every five people who buy ice cream buys vanilla ice cream. If a store sells 75 ice cream cones in one day, about how many will be vanilla

65. ## Chemistry

What is the difference between a forward and a reverse reaction? I am studying Lechatelier's principal and it states that with an increase in temperature it favors a reverse reaction and when the temperature decreases it favors a forward reaction. What

66. ## GEN CHEM

A solution of CaCl2 is prepared by dissolving 1.004 g of the solid in approximately 30 mL of water. How many moles of CaCl2 does this solution contain?

67. ## physics

A race car travels northward on a straight, level track at a constant speed travels 0.745 km in 22.0 s. The return trip over the same track is made in 27.0 s. (a) What is the average velocity of the car in m/s for the first leg of the run? m/s (b) What is

68. ## Physics help!

Two equal point charges of 5 µC are on the horizontal axis. One charge is at -10 cm, the other is at +10 cm.? These two charges don't move, they are STUCK, take the potential to be zero at infinity. Find the potential at the following coordinates: (0,0)

69. ## Spelling

Here are the words that I have to unscramble to form a sentence. It seems like it might be missing a word. disease contagious could not he doctor his conceal from... I can only come up with a sentence if I add an extra "his". The rules do not say to add an

70. ## physics

A truck of mass 13,100 kg is acted upon by a driving force of 8900 N. The motion is opposed by a frictional force of 2230 N. Find the acceleration.

71. ## Physics

A horizontal spring is lying on a frictionless surface. One end of the spring is attaches to a wall while the other end is connected to a movable object. The spring and object are compressed by 0.074 m, released from rest, and subsequently oscillate back

72. ## physics

suppose you are driving on a straight two lane road at a constant speed of 88 km/h truck travelling at a constant speed of 104 km/h approaches you.what is the truck's velocity relative to you.

73. ## Science

3. Which of the following conditions would likely cause the activation energy to be high? A.atoms are close together B.the temperature is hot C.atoms are not close together * D.a catalyst is present 4. Which of the following materials will burn the fastest

74. ## Physics

A 41.2-kg boy, riding a 2.57-kg skateboard at a velocity of +5.82 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.12 m/s, 9.72° above the

75. ## Chemistry

Can someone check my answers please? I had specific trouble with 7, 13, and 27 (I'm pretty sure my other answers are correct; some reassurance would be nice though). And I have a small question about 8. 1. The ΔHf of an element in its standard state is

76. ## Physics

A woman is standing in the ocean, and she notices that after a wave crest passes by, five more crests pass in a time of 68.0 s. The distance between two successive crests is 34.1 m. What is the wave's (a) period, (b) frequency, (c) wavelength, and (d)

77. ## chemistry

Hey, I need help finding out how many moles of CO2 is produced from this reaction. Any help is appreciated, thanks. Mass of empty Erlenmeyer flask (g): 88.000 g Mass of Erlenmeyer flask and 20 mL H2SO4: 112.198 g Mass of 20 mL H2SO4: 24.198 g Trial I Mass

78. ## Physics

A specimen has .625 the amount of carbon 14 you would find in a living specimen. How many half-lives has the specimen been through? How old is the specimen?

79. ## College physics

Open Question: Two equal point charges of 5 µC are on the horizontal axis. One charge is at -10 cm, the other is at +10 cm.? These two charges don't move, they are STUCK, take the potential to be zero at infinity. Find the potential at the following

80. ## math

three fair coins are tossed. What is the probability that at least one is tail. Enter probability as a fraction

81. ## statistics

7) Your employer, Woodbridge Electric Inc., wants to offer a warranty on the new compact fluorescent light bulb that they have produced and tested. You are called into a meeting and operational experts provide the following data: mean bulb life = 8000

82. ## physics

Two conducting thin hollow cylinders are co-aligned. The inner cylinder has a radius R1 , the outer has a radius R2 . Calculate the electric potential difference V(R2)−V(R1) between the two cylinders. The inner cylinder has a surface charge density of

83. ## Physics

A specimen has .625 the amount of carbon 14 you would find in a living specimen. How many half-lives has the specimen been through? How old is the specimen?

84. ## Physics

Roughly how high could a 340 K copper ball lift itself if it could transform all of its thermal energy into work? Assume specific heat for copper equal to 386 J/kg·K.

Modifying 1)what does the word (originally) modify in the sentence Native American originally developed lacrosse? 2) what does the word (first)modify in this sentence it was first played by the iriquois 3) what does the word (differently) modify in this

86. ## analytical chemistry

Low concentration replicate samples of Pb-EDTA gave the following counts in a mass spectral measurement: 188.3, 145.9, 159.7, 174.7, 143.7, 213.1, 164.7, 169.3, 158.7, 176.3. Ten measurements of a blank had a mean of 27.3 counts. A sample containing 1.00

87. ## Physics

If a string fixed at both ends is vibrating at a frequency of 4.61 Hz and the distance between two successive nodes is 0.293 m, what is the speed of the waves on the string?

88. ## poetry

Which one of the following is NOT necessarily an element of good poetry? A. Unique diction b. carefully selevted words c. Rhyming words d. Meaningful content. I chose c is this right?

89. ## chemistry

0.5g of fuming h2s04 oleum is diluted with water. This solution is completely neutralized by 26.7ml of 0.4N naoh. Find the percentage of free s03 in the smaple solution. The answer 20.6% Assume that 50ml of 0.01M edta solution were added to 25ml of

90. ## physical science

3. Atmospheric pressure at the top of Mt. Everest is about 150 mm Hg. That is why climbers always bring oxygen tanks. If a climber carries a 12.0 liter tank with a pressure of 35,000 mm Hg, what volume will the gas occupy if it is released at the top of

91. ## Statistics

A multiple choice test has five choices. Therefore the probability of getting the correct answer by guessing is 0.2. The test has six questions. Use the binomial formula with n = 6 and p = 0.2 to (a) Determine probability of getting two questions correct.

92. ## Physics

The mass of a string is 6.8 x 10-3 kg, and it is stretched so that the tension in it is 210 N. A transverse wave traveling on this string has a frequency of 190 Hz and a wavelength of 0.67 m. What is the length of the string?

93. ## chemistry

The specific heat of a certain type of metal is 0.128 J/(g·°C). What is the final temperature if 305 J of heat is added to 53.3 g of this metal initially at 20.0 °C?

94. ## maths-geomtery

draw a scelene triangle ABC with AB=6cm, BC=9cm and CA =8cm. Construct tanggents from vertex C to the circle through AB as diameter

95. ## algebra 1

a tree i planted a week ago has grown 6 inches. it was 1 foot tall when it was planted. if it continues at the same rates, how tall will it be 56 days from now?

96. ## programming

Write a program that computes the cost of a long distance call. The cost of the call is determined according to the following rate schedules. a.A call made between 8:00 AM and 6:00 PM is billed at a rate of 6 rupees per minute. b.A call made before 8:00 AM

97. ## statistics

about what percent of the bags of pet food weigh less than 49.8 lb?

98. ## Chemistry

What is 431804 and 10235.0 rounded to four significant figures?

99. ## math

A cylindrical pop canis 12.5 centimeters tall and 5.5 centimeters wide. What is the volume of the pop can?

100. ## physical science

3. Atmospheric pressure at the top of Mt. Everest is about 150 mm Hg. That is why climbers always bring oxygen tanks. If a climber carries a 12.0 liter tank with a pressure of 35,000 mm Hg, what volume will the gas occupy if it is released at the top of

101. ## statistics

8) Why did you choose this figure as the warranty? What percentage of bulbs would need to be replaced if you chose a warranty of 7000 or 7500? Justify your answer statistically. How do you explain this to the board of directors, marketing people and

102. ## Fin 3oo

The Lo Tech Co. just issued a dividend of \$ 2.20 per share on its common stock. The company is expected to maintain a constant 6 percent growth rate in its dividends indefinitely. If the stock sells for \$ 43 a share, what is the company’s cost of equity?

103. ## Geometry

The base of a right prism 50 inches high is a rhombus, with diagonals 30 and 16 inches. Find the total surface area of the prism.

104. ## Trig

A plane if flying at 200 mph with a heading of 45 degrees and encounters a wind of 100 mph from the west. What is the resulting velocity and heading?

105. ## Algebra and Trigonometry

A person who can swim at 3 m/s wishes to swim straight across a river flowing at 2 m/s south. What heading should they swim at? How long will it take to cross the river if it is 56 m wide?

Katya bought 2 gallons of juice. she drank 2 quarts. how much was left?

107. ## English

1-how Do you think Mrs clemm reacted to Poe's message. 2-what new insight into Edgar Allan Poe did you get from this letter

108. ## HELP>>PLZ

the vertical component of earth magnetic field at a place is root3 times the horizontal component.What is the value of angle of dip at this place?

109. ## maths

The vertical angle of a cone is 110 degree and the diametre of its base is 186mm.What is its height?

110. ## Calculus

Find the tangent line approximation for sqrt(3+x) near x=0.

111. ## maths - geometry

if the points A(1,-2) B(2,3) C(-3,2) and D(-4,-3) are the vertices of the paralleogram ABCD, then taking AB as the base, find the height of parallelogram.

112. ## chem

Calculate [OH- ] and pH for each of the following strong base solutions. (Kw = 1.0 10-14.) 3.155 g of KOH in 460.0 mL of solution] how do you do this

113. ## english

Correct the following sentences for subject verb agreement , tenses and fragments 1.my car is very playful 2. When he thought he could afford to pay his own school fees 3.these are great news indeed , I can't believe I made it 4.when I was young , I use to

114. ## Physics

In a room that is 2.69 m high, a spring (unstrained length = 0.28 m) hangs from the ceiling. A board whose length is 2.22 m is attached to the free end of the spring. The board hangs straight down, so that its 2.22-m length is perpendicular to the floor.

115. ## Physics

A 41.2-kg boy, riding a 2.57-kg skateboard at a velocity of +5.82 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.12 m/s, 9.72° above the

116. ## maths

A chord subtends an angle of 68 degree at the centre of a circle of radius 200 mm.Find the length of the chord.

117. ## Math

Althea invested \$10,000 for one year, part at 7% and part at 6 1/4%. If she earned a total interest of \$656.50, how much was invested at each rate?

118. ## Algebra

Jennifer has a recipe that calls for horseradish sauce that is 45% pure horseradish. At the grocery store she finds one horseradish sauce that is 30% pure horseradish and another that is 80% pure horseradish. How many teaspoons of each of these horseradish

119. ## Fiance

Use your knowledge of income statements to fill in the missing items: Sales Cost of goods sold \$575,000 Gross profit \$1,600,000 General and administrative expense \$200,000 Selling and marketing expense \$ Depreciation \$50,000 Operating income \$ Interest

120. ## Chemistry

Factors affecting reaction rate. Use collision theory to explain. Factor: nature of the reactant Affect on rate: more or less reactive based on its chemical identity. reactivity: aq>g>l>s Explanation: For the other factors, we had to explain it based on

121. ## Physics

A string has a linear density of 6.2 x 10-3 kg/m and is under a tension of 250 N. The string is 1.2 m long, is fixed at both ends, and is vibrating in the standing wave pattern shown in the drawing. Determine the (a) speed, (b) wavelength, and (c)

122. ## trig

cos(2x+4h)-cos(2x+2h)

123. ## physics

An electric field of 850 kV/m is desired between two parallel plates, each area 7cm x 5 cm and separated by 2.5 mm of air. a) what charge must be on each plate ? b) how much energy is stored ?

124. ## Spanish 2 help please

Can someone check my answers please? Provide the correct word (quién, quien, qué, que, como, cómo, cuánto, cuanto, cuántos, cuantos, cuando, dónde, donde) to fill in the blank for the following sentences: 1. Susana es de España __cuando____ está en

125. ## finance

if you want to have \$7000 in 10 years, how much money must you put in a savings account today? Assume the account pays 4% compounded daily.

126. ## Physics

Roughly how high could a 340 K copper ball lift itself if it could transform all of its thermal energy into work? Assume specific heat for copper equal to 386 J/kg·K.

127. ## maths

The angle between two tangents from a point to a circle is 82 degree.What is the length of one of these tangents if the radius of the circle is 80mm?

128. ## Applied Calculus

Find the relative extrema, if any, of the function. Use the Second Derivative Test if applicable. (If an answer does not exist, enter DNE.) g(x)=x^(3)-9x

129. ## stat in psyc

A normal distribution has µ = 80 and standard deviation = 10. What is the probability of randomly selecting a score greater than 90 from this distribution

130. ## Chemistry

If you have 200ml of 25% aqueous solution of ethanol, what volume of ethanol and water are in the solution?

131. ## chemistry

What is the mole ratio between all compounds of this reaction:HC2H3O2 + NaHCO3 = NaC2H3O2 + H2O + CO2

132. ## Physics science 1206

You are coasting on your skateboard at 1.4 m/s and you decide to speed up. if you accelerate at 05 m/s2 (square) for 7.0s what is your final speed?

133. ## Hard physics

Two equal point charges of 5 µC are on the horizontal axis. One charge is at -10 cm, the other is at +10 cm.? These two charges don't move, they are STUCK, take the potential to be zero at infinity. Find the potential at the following coordinates: (0,0)

134. ## algebra

A bus is traveling at a speed of 15 m/s^2. The driver approaches the same traffic light in another traffic lane. He does not brake, and continues at the same speed. Write an equation for the distance the bus travels in time (t) (Hint: At a constant speed,

135. ## Physics

A rocket in a fireworks display explodes high in the air. The sound spreads out uniformly in all directions. The intensity of the sound is 3.14 x 10-6 W/m2 at a distance of 121 m from the explosion. Find the distance (in m) from the source at which the

136. ## chm

You are heating crushed ice and a small amount of water and monitoring the temperature of the icy slurry until it reaches the point were the ice is nearly melted. How does the temperature change during this process? The temperature drops as the ice absorbs

137. ## Maths

The diagonals of a rhombus are 320mm and 240mm in length.Find the angles of the rhombus.

138. ## Statistics

Suppose that 7.6% of all people are allergic to the H1N1 vaccine. A sample of 517 people are selected a. Calculate the probability that less than 8% of the sample will be allergic to vaccine.

139. ## Pre cal

A box with a square base and no top is to be made from a square piece of carboard by cutting 8 in. squares from each corner and folding up the sides. The box is to hold 7200 in. How big a piece of cardboard is needed?

140. ## Physics

If a string fixed at both ends is vibrating at a frequency of 4.61 Hz and the distance between two successive nodes is 0.293 m, what is the speed of the waves on the string?

141. ## Chemistry

What is the pH at the equivalence point in the titration of 10.0 mL of 0.6 M HZ with 0.200 M NaOH? Ka = 7.0 × 10−6 for HZ.

142. ## math

The American Dietetic Association reported that 31 out of every 100 people want to lose weight. If 384 students were surveyed at random in the student union, how many would want to lose weight?

143. ## Algebra and Trigonometry

A plane if flying at 200 mph with a heading of 45 degrees and encounters a wind of 100 mph from the west. What is the resulting velocity and heading?

144. ## Physics

A string has a linear density of 6.2 x 10-3 kg/m and is under a tension of 250 N. The string is 1.2 m long, is fixed at both ends, and is vibrating in the standing wave pattern shown in the drawing. Determine the (a) speed, (b) wavelength, and (c)

145. ## Algebra

After one month at a new job you decide to save \$50. Each month you plan to increase your savings by five dollars. a.)Write an explicit formula to model the amount you will save each month. b.)How much will you save in the seventh month?

146. ## math

how do u solve the follow question? you are selling tickets to a football game. Student tickets (x) cost \$4 and general admission tickets (y) cost \$7. You sell 26 tickets and collect \$140. How many of each type of ticket did u sell?

147. ## Geometry

If the edges of a rectangular prism are 8cm, 6cm, and the diagonal is 10radical2, what is volume of the solid? A right circular cylinder with a radius of 4 has a lateral area of 40pi cm squared. What is the volume of the cylinder?

148. ## science

ANSWER to the qestion what is the density of a baseball be if the volume is400mL and the mass is 350g.

149. ## Anatomy and Physiology II

A 45 year-old female has thyroid disease. Because specific prosperities of the thyroid gland classify it as an endocrine organ, you conclude that this disease is an endocrine disease. Which answer below best describes the properties that classify the

151. ## Basic Chemistry (Science)

Determining Chemical Formulas? This was on my test a few days ago for Basic Chemistry, I received 8/20 and I'd really like to see how to work these problems out. *PLEASE SHOW WORK*. Their are four parts to this, If anyone could answer all four with easy

152. ## Science

Which symbiotic relationship is connected with “mutualism”? Select one: a. Mistletoe b. Aphids c. Orchids

153. ## algebra

let t = 0 be the point at which the car is just starting to drive and the bus is even with the car. Find the other time when the vehicles will be the same distance from the intersection.

154. ## math

Distance Traveled An athlete is 16 miles from home, running toward home at 6 miles per hour. (a) Write a formula that calculates the distance D that the athlete is from home after x hours. (b) Determine D when x = 1.5 hours. (c) Find x when D = 5.5 miles.

155. ## Calc

integral (x^3)/(x^2-2x+1) from -1 to 0 How do you get this integral? I was doing partial fractions and got A/(x-1)+B/(x-1), A+B=x^3, but that should equal 0 so where do I go from there?

156. ## organic chem

Draw and give IUPAC name the products of dehydration of 2-ethyl cyclopentanol I know you can't draw it but the name or even how to draw this would be appreciated

157. ## English

Summarize the sequence of events leading to the writers proposal to mimmy.in your summary,highlight the details of the couples journey to finding love.

158. ## College physics

Open Question: Find the electric field between the plates of a capacitor given the following:? (1) C= 10pF (2) the capacitor is connected to a 25 V battery (3) there is a vacuum between the capacitor plates (4) plate separation is 2 mm

159. ## PHYSICS

There is a mass at the end of a 0.6 m string, being swung around overhead at constant acceleration of(3/4)pi rad/sec^2. mass is 39.84 G. Tensile strength is 12.4 newtons need to find how many revolutions there will be before the string breaks, and the time

160. ## math

An advertising agency conducted a survey and found that the number of units sold, N, is related to the amount 'a' spent on advertising (in dollars) by the following formula: N= 1,500 + 400 ln a ( a ¡Ý 1 ) How many units are sold after spending \$ 1,000

161. ## physical science

Boyle’s law states that if you squeeze a fixed amount of a gas into a smaller volume, the pressure will increase. Explain why?

162. ## maths and physics

A particle of mass 4 kg is attached to one end of an inelastic string and a particle of mass 2 kg is attached to the other end of the string.The string has length 4m and is hung over a smooth pivot at its midpoint. The Pivot lies 3m above the ground.How

163. ## geometry

38ft rope extended to end gives 70°angle of elevation what is height

164. ## life orientation

actions can be taken when dealing with unethical behaviour

165. ## Biochemistry

Preform dilution calculations for 10 ml of 2 M stock solution. Molecular weight for the component is 48.6 g / mol

166. ## Applied Math - Cosine Periods)

Trying to decypher something, and am getting fouled up with the radians definition of periodicity. Problem: Average temperatures vary over a one year period, or 365 days. Highest temperature = 5 C, lowest = -37 C. Lowest temperature is on day = 20, highest

167. ## statistics

In order to plan for parking and transportation needs at a college, administrators asked students how they got to school. Some came by bus, some came by car and the others used “personal “ transportation – bikes, skateboards, or walked. The following

168. ## trig

cos(2x+4h)-cos(2x+2h)=?

170. ## Math

ABCD is a square with each side lenght 1 .Suppose BPC is an equilateral triangle ,find the area if the triangle BPD ...

171. ## Physics

At what temp would an intrensic semiconductor behave like a perfect insulator?Why?

172. ## Math

In a set of 400 ACT scores where the mean is 22 and the standard deviation is 4.5, how many scores are expected to be lower than 26.5? How many of the 400 scores are expected to be greater than 31?

173. ## pre-calculus

proving that the statements are true for all natural numbers 1+2+3+....+n=n(n+1)/2 i don't understand when trying to prove that P(k+1) = 1+2+3+...+k+k(k+1)= 1/2 how do you do this step???

174. ## Fluid Imbalances

Why would a person who's blood gasses indicate metabolic acidosis be at risk for hyperkalemia?

175. ## math

calculate the monthly finance charge for the credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. ( round your answers to the nearest cent). \$ 400 balance, 15%, \$ 50 payment. A)

176. ## College Physics

A proton is put on the positive Y axis a large distance (100km) from the origin. What is the minimum speed required in the - Y direction so the proton will just reach the point (0,20) cm?

177. ## world history

Suggested reasons why many New World population centers seem to have been abandoned around 1300 CE include:

178. ## algebra

rachel and rosa each invested the same amount of money in bonds. Rachel got an 8% return on her money and rosa got a 9% return. If rosa's annual interest was \$500 more than rachel's, how much did each invest? Do i need a chart for this problem?

179. ## College Algebra

A calculator company produces a scientific calculator and a graphing calculator. Long-term projections indicate an expected demand of at least 100 scientific and 80 graphing calculators each day. Because of limitations on production capacity, no more than

180. ## science

After a sled passed over a snowy path on a hill, the grass or dirt under the snow may begin to show through where the sled has traveled, why?

181. ## algebra

A bus is traveling at a speed of 15 m/s^2. The driver approaches the same traffic light in another traffic lane. He does not brake, and continues at the same speed. Write an equation for the distance the bus travels in time (t) (Hint: At a constant speed,

182. ## holy school

H2 S + HNO3 --------> NO + H2 O + S 150 g of hydrogen sulfide are dissolved in 3500 mL of water. a. What is the molarity of the hydrogen sulfide solution? b. How many grams of sulfur can be produced from 50 mL of this solution? c. 22.4 L of nitrogen

183. ## algebra

asked by sam help i just switched schools & i am LOST!
184. ## mathematica

Christmas lights that stay on when one bulb burns out are wired as parallel circuits. Resistors can be used with parallel electrical circuits to restrict the current flow and produce heat. If the first resistor (R1) = 20 Ohms, the second resistor (R2) = 30

185. ## science

what combination of mediums will produce a stright line of light? how do you correct for hyperopia? how do you correct for myopia? what kind of people have an astigmatism? what part of the eye act as a lens and what part acts as a screen? how do different

186. ## Math

I am working on a graphing exercise where I had to make a picture using ordered pairs and graph it. Then I had to graph the inverse coordinates. Finally it said to make a different graph this time using the "negative of the ordered pair". I don't

187. ## physics

Eelectrons, like all forms of matter, fall under the influence of gravity. if a electron is projected horizontly with a speed of one-tenth speed of light, how far will it fall in traversing 1 meter of horizontal distance.

188. ## pre calc

show that the statements are true for all natural numbers 1^3 +2^3 +5^3+....+(2n+3)^3 =n^2(2n^2 -1)

189. ## statistics

Given that the general population is normally distributed on a standard scale measuring math aptitude with Mean = 50 (s.d. = 10), approximately what percentage of the population has a math aptitude score between 40 and 60?

190. ## calculus

derivative of (3x+2)^6- 8(7x^2+9)^4 all cube rooted! plz help!

191. ## math

Is it possible to write a Pythagorean triple in which all the numbers all odd?

192. ## Math

A manufacturing firm is thinking of launching a new product. The firm expects to sell \$950,000 of the new product in the first year and \$1,500,000 each year thereafter. Direct costs including labor and materials will be 45% of sales. Indirect incremental

193. ## Chemistry

1.) A 3.000gram sample of a hydrate compound containing Co, C2O4, and H2O was combusted to give 1.316g of Co3O4. What is the percentage of Cobalt in the oxide? 3.) 2.000 grams of a sample containing Co, C2O4, and H2O showed there to be 0.9621g of oxalate

194. ## maths and physics

A cannon is placed on a hillside pointing up the hill, where the hill is at an angle a Pi/4 to the horizontal. The cannon points at an angle Pi/6 to the slope. and a shot is red uphill with initial speed v0. (i) Find the maximum value of the distance

195. ## Math

Can someone tell me whether an enthalpy diagram has 2 axes? Now i know it has 2 but suddenly i'm not very sure because i dunno what they are!! so can anyone help me? i suck at chem!

196. ## algebra

Rectangle Dimensions The length of a rectangle is 7 inches longer than the width. If the perimeter of the rectangle is 62 inches, find the measures of the length and width.

197. ## general chemistry

In an appropriate reference read a dicussion of mass and volume measurements

198. ## physics

If a hollow metal cylinder of radius r is rolling towards a circular bump of height h. calculate the minimum speed needed to progress over a circular bump.

199. ## math

Classify the finacial problem. Assume a 7% interest rate compounded annually. Find the value of a \$ 1,000 certificate in 4 years. a) sinking fund, b) ordinary annuity, c) future value, d) present value e) amortization

200. ## Math Statistics

1. How many ways can you possibly have if you bet on a single number if there are 38 possible number of choices you have? 2. How many winning combinations can you have when you have 12 numbers to choose from out of 38?

201. ## Quantum Physics

Suppose H|ψ> = 1/√2 (|000> + |111>). What is |ψ> ? Specify the probability amplitude for each component: |000> = |001> = |010> = |011> = |100> = |101> = |110> = |111> =

202. ## Economic

A BUSINESS CYCLE IS CHARACTERIZED BY A CONTINUAL CYCLE OF EXPANSION AND CONTRACTION.WRITE AN ESSAY BRIEFLY ANALYZING THE COMPOSITION/PHASES OF BUSINESS CYCLE.

203. ## Quantum Physics

Suppose Alice starts with two qubits in the Bell state 1/√2 (|00> + |11>) and teleports these qubits to Bob by applying the quantum teleportation protocol to each qubit separately. (a) What is the state of the two qubits received by Bob? |00> = |01> =

204. ## Earth Science

Which horizons are composed of unweathered rocks, weathered rocks, young soil, and q well-developed soil?

The sentence is Native Americans originally developed lacrosse what is the word that (originally) modifies

206. ## Math

Please help me factor this, I just can't get it to work. -12x^2 - 35x - 18 Thanks!

207. ## math

Is it possible to write a Pythagorean triple in which all the numbers are even?

208. ## math

Is it possible to write a Pythagorean triple in which all of the numbers are odd? Explain your reasoning.

209. ## french

Translate a Annecy en juin

210. ## algebra

A truck traveling at 16 m/s is 24 meters behind the bus at t = 0. The equation d = -24 + 16t gives the position of the truck. At what time will the truck be the same distance from the intersection as the bus? What will that distance be?

211. ## phi 103

Logic can help analyze ethical problems.

212. ## Math

elaine is stocking a new box that is 24 inches long, 12 inches wide, and 10 inches high. Make a recommendation to elaine regarding a price for this box size. remember that her box supplier charges her 1/2 cent per square inch of surface area for each box

213. ## math

If you need a minimum of 27 correct out of 30 to get an Aon a test, how many correct answers would you need to get an A on an 80-point test assuming that the same ration is used for scoring purposes?

214. ## geometry

167.08 square inches. I need to know the radius of a circle for that number of square inches..

215. ## Math

In American roulette where there are 38 numbers, how many possible outcomes can you have if you bet on an odd number?

(sqrt(ln(x)))/(ln sqrt(x))=6

217. ## Science

Why does the downhill-race bike look the way it does and what magnitude of force and any dynamic loads effect the bike. please help

218. ## math

Let 2^a = 5 and 2^b = 10. Using exponent rules, solve the equation in terms of a and b. 10^x =(1/64)

219. ## Government

When has the constitution protected 2 fundamental principles? When has it failed to protect 2 fundamental principles?

220. ## Physics

Let U=(13i3−i). What is U†? Explicitly indicate multiplication with a * symbol. For instance, you should write 3*i+2 instead of 3i+2.

221. ## math 116

Will someone please help me slove this problem. A family refers to a group of two or more people related by birth, marriage,or adoption !@#\$%^&sides together. In 2,00in Country A, the average family net worth was \$460,000, and there were about 9.3 x 10 to

222. ## algebra

Set the equations equal to each other so you can determine when the car and bus are the same distance from the intersection. Collect all the terms on the left side of this new equation., leaving 0 on the right side. Factor the expression on the left side

223. ## Science

Why does the downhill-race bike look the way it does, what stuff does it have which normal bikes don't and what magnitude of force and dynamic loads effect the bike. please help

asked by Bill Nye The Science Guy
224. ## Math!!

Christmas lights that stay on when one bulb burns out are wired as parallel circuits. Resistors can be used with parallel electrical circuits to restrict the current flow and produce heat. If the first resistor (R1) = 20 Ohms, the second resistor (R2) = 30

225. ## Physics

A 3.0 kg block slides down a 4.5 m ramp of angle 30 degrees and collides inelastically with a 4.5 kg bolck at rest. Calculate the velocity after the collision.

226. ## grammar..

Is it correct.... They themselves are greedy.

227. ## Physiology

When maternal oxygen is transferred to the fetus and fetal CO2 is passed back, how does this affect the maternal dissociation curve? Does this shift increase the transfer of oxygen to the fetus?

228. ## Chemistry

what is the percent by mass of NaCHO3 in a solution containing 12g NaCHO3, dissolved in 450mL of water?

229. ## math (differential equation)

show that y sub n=cos(ncos^-1(x)) satisfies the differential equation: (1-x^2)(d^2y/dx^2)-x(dy/dx)+n^2(dy/dx)=0

230. ## math

calculate the monthly finance charge for the credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. ( round your answers to the nearest cent). \$ 400 balance, 15%, \$ 50 payment. A)

231. ## Economic

A BUSINESS CYCLE IS CHARACTERIZED BY A CONTINUAL CYCLE OF EXPANSION AND CONTRACTION.WRITE AN ESSAY BRIEFLY ANALYZING THE COMPOSITION/PHASES OF BUSINESS CYCLE.

232. ## science

How do i plot i schild plot with this data: Conc (M) 10^-8 Ec50= (microM) 12

233. ## math

Is it possible to write a Pythagorean triple in which 2 of the numbers are odd and one is even? Explain your reasoning.

234. ## math

Is it possible to write a Pythagorean triple in which all of the numbers are even? Explain your reasoning.

235. ## math

As South Campus, the student-faculty ration is about 16 to 1. If the 128 students enroll in Statistics 101, how many sections should be offered?

236. ## Math calculus

Which box is bigger the 10*4*1 or the 6*4*3 box. Thanks.

237. ## algebra

how much money is 16 dimes and 24 quarters?

238. ## Urgent 1 Math question

Elaine has a customer who needs a box with a volume of 12 cubic inches. Th e customer wants to know what size box is the least expensive to buy. • Th e price will be based on surface area. Th e supplier charges _ 21_ cent per square inch. • Th e

239. ## chemistry

What volume (mL) of a 3.23 %w/v saline solution contains 69.1 mg of NaCl?

240. ## chemistry

if a gallon of antifreeze weighs 8.75 pounds. what is the density of the antifreeze in g/ml?

241. ## Life orientation

What,according to the basic conditions of employment act applies with regard to the contraventions that you've identified?

242. ## Life orientation

What can thembi do to deal with the unethical behaviour?name 4 action she can take. 3.3.3 How should discrimination in the work place be dealt with?

243. ## physics

A proton is put on the positive Y axis a large distance (100km) from the origin. What is the minimum speed required in the - Y direction so the proton will just reach the point (0,20) cm?

244. ## Math

The base of a mid pyramid is triangle whose length of 3 sides are 28cm,25cm and 17cm. If the volume of pyramid be 1120 cu.cm then what will be its height

245. ## economics 1A

how does current production choices influence future production possibilities

246. ## Math-Algebra

1) log(9 – x) – log(6 + x) = 1 2) e^2x + e^2x = 1 3) 2e^6x + e^6x = b

247. ## Physics

Find the electric field between the plates of a capacitor given the following: (1) C= 10pF (2) the capacitor is connected to a 25 V battery (3) there is a vacuum between the capacitor plates (4) plate separation is 2 mm

248. ## Grammar.....

She herself knows the truth. Is this correct? The reflexive pronoun is added for emphasis.

249. ## Anatomy and Physiology II

1. Which answer below includes all the phases of respirations? A. Breathing, pulmonary ventilation, gas transport, and cellular respiration B. Pulmonary ventilation, external respiration, internal respiration, and gas transport C. Inhalation, external

250. ## Math-Algebra

10log(5x + 40) = 10

251. ## math

Is it possible to write a Pythagorean triple in which 2 of the numbers are odd and one is even?

252. ## trig

cos(2x+4h)-cos(2x+2h)=?

253. ## us history

what roel did jacksons popularity play n the election of 1836 and 1840

254. ## physical science

10. A balloon has a volume of 0.5 L at 20°C. What will the volume be if the balloon is heated to 150°C? Assume constant pressure and mass.

255. ## math

5b-84/8b-7b-5y/4b+2 simplified

ln x = 6 ln^2 x SOLVE FOR x

257. ## maths

A rectangle has sides 170mm and 130mm.What is the angle between the diagonals?

258. ## Math

what is the point of intercept for 30x+50=25x+75 using the equal values method

259. ## maths-perimeter

Plse tell me if there is any relation between area and perimeter of any regular polygan , if the answer is yes. Can it be applicable to irregular ones also

260. ## math

Is it possible to write a Pythagorean triple in which 2 of the numbers are even and one is odd?

261. ## math

Is it possible to write a Pythagorean triple in which 2 of the numbers are even and one is odd? Explain your reasoning.

262. ## ore algebra

X(yz),for x = 8, y = -9, z = 5

263. ## Math

Elaine has a customer who needs a box with a volume of 12 cubic inches. The customer want to know what size box is the least expensive to buy. .the price will be based on surface area. the supplier charges 1/2 cent persquare inch. .the dimensions of the

264. ## Pre calulus only 15 min left HELP!

((ln(x))^1/2)/(ln(x^1/2))=6 solve for x

265. ## mathematics

how to solve exponatins equations by trial and error

266. ## psyc

A normal distribution has µ = 80 and standard deviation = 10. What is the probability of randomly selecting a score greater than 75 from this distribution?

(sqrt(ln(x)))/(ln sqrt(x))=6

347 O F = OC

269. ## Math

ln x = 6 ln^2 x solve for x