Questions Asked onNovember 1, 2012

1. Chemisty

Enrico Fermi was a famous physicist who liked to pose what are now known as Fermi problems in which several assumptions are made in order to make a seemingly impossible estimate. One example of a Fermi problem is "Caesar's last breath" which estimates that

2. Andrew Carnegie treating his workers??????

How did Andrew Carnegie treat his workers? He treated them very bad. They were paid little and worked long hours, they were beaten and threatened even though he fought for workers who have bad working conditions he treated his very poorly.

3. calculus

If x^2 + y^2 = 100 and dy/dt = 6, find dx/dt when y = 8. (Enter your answers as a comma-separated list.)

4. Chemistry

Dry air (0% humidity) is approximately 78% N2, 21% O2, and 1% Ar by moles. Calculate the molar mass and density of dry air at 0 °C and 1.0 atm. Assume ideal behavior and use two significant figures in your answers.

5. Physics

Tom the cat is chasing Jerry the mouse on a table. Jerry puts on the brakes and stops and Tom continues right off the edge of the table at 4.00 m/s. If it takes Tom 0.50 seconds to hit the ground, then the table is approximately ____ meters high and Tom

6. Thermal Physics, Kinetic Theory of Gases

Oxygen (O2) has a molar mass of 32 g/mol. (e) Suppose an oxygen molecule traveling at this speed bounces back and forth between opposite sides of a cubical vessel 0.10 m on a side. Find the average force it exerts on one of the walls of the container.

7. CHEM Periodic Trends

Each of the statements below attempts to explain why some periodic property varies predictably among elements in the periodic table. Determine if each statement is true or false. Within a family, elements with higher atomic numbers have higher

8. AP Psychology

Chlorpromazine is an antipsychotic drug that reduces paranoia and hallucinations by increasing involuntary muscle movements. reducing involuntary muscle movements. dampening responsiveness to irrelevant stimuli. decreasing the availability of

9. Physics

A 190-kg merry-go-round in the shape of a uniform, solid, horizontal disk of radius 1.50 m is set in motion by wrapping a rope about the rim of the disk and pulling on the rope. What constant force would have to be exerted on the rope to bring the

10. Chemistry

In a reaction between methane, CH4 and chlorine, Cl2 four products can form: CH3Cl, CH2Cl2 + CHCl3 and CCl4. In a particular instance, 20.8 g of CH4 were allowed to react with excess Cl2 and gave 5.0 g CH3Cl, 25.5 g CH2Cl2+ and 59.0 g CHCl3+ all the CH4

11. chem

A very flexible helium-filled balloon is released from the ground into the air at 20degree C The initial volume of the balloon is 5.00L , and the pressure is 760mmHg. . The balloon ascends to an altitude of 20Km , where the pressure is 76.0mmHg and the

12. General Chemistry

An electron in a hydrogen atom relaxes to the n = 4 level, emitting light of 114 THz. What is the value of n for the level in which the electron originated? I am halfway through, but uncertain as to how to simplify the problem to completion. (6.63 x 10^-34

13. Chemistry

Given that the initial rate constant is 0.0190s^-1 at an initial temperature of 20 degrees Celsius, what would the rate constant be at a temperature of 170 degrees Celsius? Activation energy = 45.2kJ/mol

14. chemistry

A 15.0ml sample of NaCL solution has a mass of 15.78g.after the NaCL solution is evaporated to dryness, the dry salt residue has a mass of 3.26g. calculate the following concentrations for the %(m/m), % (m/v), molarity (M)

Oxygen gas can be generated by heating KClO3 in the presence of some MnO2. 2KClO3 → 2KCl + 3O2 If all the KClO3 in a mixture containing 1.00 g KClO3 and 0.25 g MnO2 is decomposed, how many liters of O2 gas will be generated at T = 24.0°C and P = 755.6

16. Stats

A student takes a 32 question multiple choice exam but did not study and randomly guesses each answer. Each question has three possible choices for the answer. Find the probability that the student guesses more than 75% of the questions correctly. (Round

17. English

you are a speaker in a school debate on the topic "Boys must not help in the kitchen" stand for the motion

18. math

The pair of points (6, y) and (10, –1) lie on a line with slope 1/4. What is the value of y? –5 –2 2 5 I think it might be -2?

19. Physics

A 5.00 cm tall candle is placed at a distance of 50.0 cm from a double convex lens having a focal length of 15.0 cm. What is the magnification of the image? -0.429 -2.33 0.429 2.33

20. Chemistry with Qualitative Analysis

Help please with Carbon analysis. An air bubble accidentallyy enter the CO2-collection graduated cylinder after the completion of the reaction. How does this error affect the reported moles of CO2(g) collected--too high, too low, or unaffected? Explain.

asked by EJ Nunez
21. AP Chemistry

A 2.50 L balloon is filled with helium gas at sea level, 1.00 atm and 32 degrees celsius. The balloon is released and it rises to an altitude of 30,000 ft. If the pressure at this altitude is 228 mm Hg and the temperature is -44 degrees celsius, what is

22. Calculus

F(x) = x^5 ln x A) Find the interval on which f is increasing Find the interval on which f is decreasing B) Find the local minimum value of f C) find the inflection point (x,y) Find the interval in which f is concave up Find the interval in which f is

23. Physics

A person walks the path shown below. The total trip consists of four straight-line paths. Path 1 is 30.0 m due east. Path 2 is 200.0 m due south. Path 3 is 140.0 m 30.0° south of west. Path 4 is 170.0 m 60.0° north of west. At the end of the walk, what

24. AP Physics B

A 2189 kg car moving east at 9.73 m/s collides with a 3285 kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 35.7◦ north of east and at a speed of 4.79 m/s. What was the speed of the 3285 kg car before

25. chemistry

Assume you are performing the calibration step of Experiment 8 and you begin with 70 g of water at 20 oC and 70 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment,

26. science

What volume of a 6.0 M NaOH solution would you need to prepare 250.0 milliliters of a 3.0 M NaOH solution?

27. Math

A multiple-choice test has four possible answers for each question. If a student guesses at the answer, what is the probability that he or she selects the correct answer

asked by Pamela Straw
28. algebra

A landscaper is designing a flower garden in the shape of a trapezoid. She wants the shorter base to be 3 yards greater than the height and the linger base to be 7 yards greater than the height. She wants the area to be 295 square yards. The situation is

29. Microecon

Using the midpoints approach to the cross elasticity of demand-calculate the cross eleasticity the demand for golf at all 3 prices. Price Demand1 D2 D3 50 15 10 15 35 25 15 30 20 40 20 50 D1 -Income \$50k per yr, movies \$9 D2 -Income \$50k -movies \$11 D3

30. chemistry

In a reaction between methane, CH4+ and chlorine, Cl2+ four products can form: CH3Cl, CH2Cl2 + CHCl3+ and CCl4. In a particular instance, 20.8 g of CH4 were allowed to react with excess Cl2 and gave 5.0 g CH3Cl, 25.5 g CH2Cl2+ and 59.0 g CHCl3+ all the CH4

31. Chemistry

What is the total number of atoms in one unit (molecule or formula unit) of CO2? Then what is the total number of atoms in a mole of CO2 how do I figure this out please

32. math

9. If possible, change each comparison of red paint to white paint to a percent comparison. If it is not possible, explain why. a. The fraction of a mix that is red paint is b. The ratio of red to white paint in a different mix is 2 to 5. 10. If possible,

33. University Physics

A 8.3-g bullet, when fired from a gun into a 1.1-kg block of wood held in a vise, penetrates the block to a depth of 7.05cm. This block of wood is next placed on a frictionless horizontal surface, and a second 8.3-g bullet is fired from the gun into the

34. Science

If 200ml of water were used instead of 100ml,how many grams of the compound would dissolve at 40c

35. Chemistry

A pressurized can of whipped cream has an internal pressure of 1.080 atm at 25°C. If it is placed in a freezer at -8°C, what is the new value for its internal pressure (in atmospheres)?

36. chemistry

if 53.0mL of 0.150M of HCl is needed to neutralize all the NH3 from a 2.28g sample of organic material. what is the mass percent of notrogen in the sample?

asked by lisa mendez
37. Physics

A 5.00 cm tall candle is placed at a distance of 50.0 cm from a double convex lens having a focal length of 15.0 cm. What is the image distance? -21.4 cm 21.4 cm 65 cm 35 cm

38. math

If you are flying to a city 800 miles away, what will be the difference in flight times between flying into a 40-mph headwind and flying with a 40-mph tailwind if the plane's maximum speed with no wind is 160 mph?

39. Algebra

steps to solving : 28-6x+4=30-3x

40. circle

two parallel chords of length 30 cm and 16 cm are draw on the opposite sides of center of a circle of radius 17 cm find the distance between the chord

asked by surbhi kumari
41. chemistry

In an experiment a student allowed benzene C6H6+ TO REACT WITH EXCESS BROMINE BR2+ In an attempt to prepare bromobenzene C6H5Br. This reaction also produced as a by-product, dibromobenzene, C6H4Br2+ On the basis of the equation. C6H6 + Br2 -> c6h5Br + H Br

42. Physics B

An air puck of mass 0.289 kg is tied to a string and allowed to revolve in a circle of radius 0.51 m on a horizontal, frictionless table. The other end of the string passes through a hole in the center of the table and a mass of 0.98 kg is tied to it. The

43. Chemistry

In an experiment a student allowed benzene C6H6, TO REACT WITH EXCESS BROMINE BR2, in an attempt to prepare bromobenzene C6H5Br. This reaction also produced as a by-product, dibromobenzene, C6H4Br2, On the basis of the equation. C6H6 + Br2 -> c6h5Br + H Br

44. Anatomy & Physiology

what would happen if there were no negative feedback control on growth hormone and thyroid hormone?

the evening melted away like a snowflake.the answer is what simile oe personification

asked by charly pierre
46. math

at the grocery store 3/8 of the 408 employees are under the age of 25. How many workers at the grocery store are under the age of 25

47. physics

moment of inertia of a ring perpendicular to tangent and its plane

48. Chemistry

Find the theoretical pH of .01M and .05M benzoic acid buffer when 2ml of .1MNaOH was added to each buffer.

49. Physics

A roller-coaster car speeds down a hill past point A where R1 = 10.4 m and then rolls up a hill past point B where R2 = 15.6 m, as shown below. R1 and 2 are radii (a) The car has a speed of 21.0 m/s at point A. if the track exerts a normal force on the car

50. Statistics

Opinion polls find that 13% of Americans "never have time to relax." If you take an SRS of 543 adults, the approximate distribution of the number in your sample who say they never have time to relax will be binomial with parameters: n= p=

51. Calculus

Find the volume of the solid obtained by rotating the region enclosed by y=x^3, y=25x, x ≥ 0

52. Chemistry

consider the following molecules:SiH4, PH3, H2S. What is similar about these molecules? What is different about these molecules and why?

53. physics

A curve of radius 20 m is banked so that a 970 kg car traveling at 50 km/h can round it even if the road is so icy that the coeﬃcient of static friction is approximately zero. The acceleration of gravity is 9.81 m/s^2 Find the minimum speed at which a

54. math

Jacob opens a savings account on January 1 with a deposit of \$350. He has "direct deposit," in which \$25 is deposited every other week. The bank also charges a \$3 monthly processing fee. How much money will he have at the end of the year?

55. Geometry

Suppose you have four identical pieces of wood like those shown below. If m

58. chem

A very flexible helium-filled balloon is released from the ground into the air at 20degree C The initial volume of the balloon is 5.00L , and the pressure is 760mmHg. . The balloon ascends to an altitude of 20Km , where the pressure is 76.0mmHg and the

59. Math

James is making a quart of won ton soup using canned chicken broth. A can of chicken broth holds 14 fl oz. How many cans will James need to buy? 32 fl oz=1 qt? 3 cans?

60. Chemistry for Eng.

Select the delta H values associated with the dissolution of lithium chloride that are exothermic. delta H1: energy associated with the separation of water molecules delta H2: energy associated with the separation of ions delta H3: energy associated with

61. AP Physics B

A 0.408 kg puck, initially at rest on a horizontal, frictionless surface, is struck by a 0.0886 kg puck moving initially along the x axis with a speed of 3.14 m/s. After the collision, the 0.0886 kg puck has a speed of 2.14 m/s at an angle of 38◦ to the

62. Calculus

Find the volume of the solid obtained by rotating the region enclosed by y=x^3, y=25x, x ≥ 0

63. chemistry

In an experiment a student allowed benzene C6H6+ TO REACT WITH EXCESS BROMINE BR2+ In an attempt to prepare bromobenzene C6H5Br. This reaction also produced as a by-product, dibromobenzene, C6H4Br2+ On the basis of the equation. What is the maximum amount

64. History---Modern World History

Write a short paragraph that traces the rise of Japan from an isolated society to a major industrial and imperial power. I'm good at writing paragraphs but I really don't understand the question! If someone could explain to me what my teacher wants and how

65. Physics

A stone is released from an elevator going up with accelaration 'a' . The acceleration of the stone after release is ?

66. Math

Im really struggling with these proving identities problems can somebody please show me how to do these? I'm only aloud to manipulate one side of the equation and it has to equal the other side of the equation at the end Problem 1. (1-tanx) =

67. statistic

in a random sample of 400 voter, 120 plan to vote for candidate A. determine a 95% confidence interval

68. chem

A sample containing 6.40 g O2 gas has a volume of 15.0 L. Pressure and temperature remain constant. a. What is the new volume if 0.600 mole O2 gas is added? b. Oxygen is released until the volume is 12.0L. How many moles of O2 are removed? c. What is the

69. calculus

a rectangle has its base on the x-axis, and its upper corners in the graph of y=27-x^2. what is the maximal area of this rectangle?

70. chem

Calculate the amount of heat transferred when 2.06 g of Mg(s) reacts at constant pressure. 2 Mg(s) + O2(g) ¨ 2 MgO(s) ƒ¢H = -1204 kJ

71. Physics

A car is stopped at a stoplight. When the light turns green, it accelerates with a constant acceleration of 2.5 m/s^2. At the same instant, a truck passes the car in the same direction with a constant velocity of 15 m/s. how long until the car catches the

72. chemistry

How many moles are in 4.80 grams on SnO2?

73. Physics

A submarine dives 96 m at an angle of 24° below the horizontal. What are the two components? x = m y = m

74. physics

A car traveling in a straight line has a velocity of +5.5 m/s. After an acceleration of 0.65 m/s^2 , the car’s velocity is +8.9 m/s. In what time interval did the acceleration occur? Answer in units of s

75. math

round 529 to the nearest hundred

76. Physics

A shopper pushes a cart 38 m south down one aisle and then turns 90.0° west and moves 25 m. He then makes another 90.0° turn and moves 17 m. (a) What is the largest possible displacement of the shopper? m ° counterclockwise from west (b) What is the

77. Chem

What pressure (atm) is needed to confine an ideal gas to 68.0 L after it has expanded from 44.0 L and 2.3 atm at constant temperature?

78. math

if 400 customers come to a grand opening and every 5th customers receives a coupon for jeans and every 7th customers receives a coupon for a free sweater. how many customers will leave with both

79. SS8R: Robber Baron or Captains of Industry Project

Create a PowerPoint about your Captains of Industry (min. 7 slides) I chosen Andrew Carnegie, John D. Rockefeller, and Cornelius Vanderbilt for me previous assignment (that's why I ask you those questions about them). Now I have to choose ONE OF THEM to do

80. math

How many pounds of candy selling for \$2.25 a pound should be added to four pounds of candy selling for \$4 a pound to create a blend, which will sell for \$3.25 a pound?

81. Physics

The system shown in the ﬁgure is in equilibrium. A 15 kg mass is on the table. A string attached to the knot and the ceiling makes an angle of 54◦ with the horizontal. The coeﬃcient of the static friction between the 15 kg mass and the surface on

82. Statistics

Suppose the mean height of a population is 65 inches with a standard deviation of 1.5 inches. What is the z value for a height (x) of 67 inches?

83. math

how many possible combinations are there to make \$1.55 using a dollar, dimes and pennies?

84. IT

Can someone please help me start this? Using Shannon’s formula, calculate the data transfer rate given the following information: signal frequency = 10,000 Hz signal power = 5000 watts noise power =230 watts.

85. algebra

A Square Has A Side Length Of S . Write A Rule In Function Notation To Represent The Perimeter

86. statistics

the monthly sales at a computer store have mean of \$25,000 and a standard deviation of \$4,000. profits are calculated by multiplying sales ny 30% and subtracting fixed cost of \$60,000. find the mean and standard deviation of monthly profit

87. physics

A car traveling at +6.3 m/s accelerates at the rate of 0.65 m/s^2 for an interval of 2.2 s. Find vf . Answer in units of m/s

88. physics

An object with a mass of 5000kg is 6.5m away from an object with the mass of 2000kg. What is the force exerted on the smaller mass by the bigger mass?

89. algebra

The time it takes you to get to campus varies inversely as your driving rate. Driving at a rate of 40 miles per hour, it takes 1.5 hours. How long would the trip take you driving at a rate of 60 miles per hour?

90. Psychology

Which of the following would best explain a situation in which a small child is afraid of a guinea pig because he had a previously fearful experience with a hamster? Stimulus discrimination Second-order conditioning Stimulus generalization Sensory

91. Physics

A space station shaped like a giant wheel has a radius 105 m and a moment of inertia of 5.09 108 kg · m2. A crew of 150 lives on the rim, and the station is rotating so that the crew experiences an apparent acceleration of 1g. When 100 people move to the

92. 7th Grade Art

1. If you take this aesthetic view, you believe that how the artist used the elements and principles of art is the most important part of an artwork. -Civic View -Composition View 2. If you take this aesthetic view, you believe that the meaning, message,

93. Information Systems

Richard's Plumbing Co. has rapidly grown to become a multi-state business, and it has recently acquired Mr. Plumber, a smaller company with multiple outlets located in the same states. Each of the companies has its own data network. Mr. Plumber's network

94. Math

Im really struggling with these proving identities problems can somebody please show me how to do these? I'm only aloud to manipulate one side of the equation and it has to equal the other side of the equation at the end Problem 1. Sinx/(cotx+1) +

95. Physics

Tom the cat is chasing Jerry the mouse on a table. Jerry puts on the brakes and stops and Tom continues right off the edge of the table at 4.00 m/s. If it takes Tom 0.50 seconds to hit the ground, then the table is approximately ____ meters high and Tom

96. Physics

The essential part of the Hot Wheels speed booster is made of two fast spinning, rubberized disks of radius r=0.048 m each. The toy car entering the booster is in direct contact with both wheels, which send it away after brief encounter with it. When the

97. calculus

Find the dimensions of the rectangle with the largest area that is inscribed inside the parabola y = 16- x^2 and the x-axis

98. circle

two parallel chords of length 30 cm and 16 cm are draw on the opposite sides of center of a circle of radius 17 cm find the distance between the chord answer

asked by surbhi kumari
99. Angular Speed-Physics

Stars originate as large bodies of slowly rotating gas. Because of gravity, these clumps of gas slowly decrease in size. What happens to the angular speed of a star as it shrinks? Explain.

100. AP Psychology

Why would a neurosurgeon cut the corpus callosum and therefore disrupt left/ right brain hemisphere communication? reduce anxiety attacks and phobic reactions. prevent the spread of epileptic seizures. reduce the incidence of violent behaviors. treat

101. Psychology

What approach to therapy would be used by a therapist who teaches a deaf child to sign "help" by rewarding him each time he makes the sign? Cognitive Biological Behavioral Psychodynamic Humanistic I'm torn between behavioral and cognitive.

102. Physics

A o.1 kg coin is placed on the horizontal surface of a rotating turntable at a position that is 0.12 m away from the center of the turntable. If the coefficient of static friction equals 0.3 between the coin and the turntable, what maximum speed, v, can

103. math

A line has slope –. Through which two points could this line pass? A.(12, 13), (17, 10) B.(16, 15), (13, 10) C.(0, 7), (3, 10) D.(11, 13), (8, 18) I think it is A?

104. Math

Sarah is following a recipe that calls for 1 1/4 cups of flour. About how many cup of flour would she need to make 4/9 batch of the recipe?

105. physics

If a disk rotating at 900 rpm couples to a stationary disk with five times the moment of inertia, what is the angular speed of the combination?

106. Physics

A line of identical train cars collide inelastically. (They couple.) Three carts are initially coupled and moving at speed v: the rest are stationary. The three moving cars hit a fourth, then those four hit a fth, and so on. This continues until the speed

107. Physics

A 63 Ω resistor is connected to a 4.7 V battery a) When the switch is closed, calculate the current I. Answer in units of A. A 7.4 Ω resistor is connected to a 4.7 V battery When the switch is closed, calculate the current I. A 69 Ω resistor is

108. pre-algebra

why there's no # 54-72 on pg. 214 on the 7th grade math textbook??? if you can't tel why it's ok and thanks by the way

109. chemistry

If 75mL of a hard water sample required 23.00 mL of .200 M EDTA, calculate the total hardness

110. Physics

An air puck of mass 0.289 kg is tied to a string and allowed to revolve in a circle of radius 0.51 m on a horizontal, frictionless table. The other end of the string passes through a hole in the center of the table and a mass of 0.98 kg is tied to it. The

If glaciers worldwide were to melt, would temperature around the glacier rise, fall or remain the same as the glacier was melting?

112. Chemistry

How many moles of compound are in 1.55 x 10^3 Kg of carbon tetrafluoride, CF4

113. math

A blue candle is twice as long as a red one. The blue takes 6 hours to burn out and red takes 15 hours. After 5 hours, what fractional part of each is left? Thanks for your help!

114. Psychology

Which of these believe that a healthy child will choose what is good for his own growth? Humanistic Social learning theory Psychoanalytic Behavioral Psychodynamic

115. Psychology

Jennifer reads books recommended by her history teacher even though there is no grade given for reading them. Which of these applies? Functional fixedness Intrinsic motivation Inductive reasoning Incubation Heuristics

116. Biology

Name of banana's stem,flower

117. physics

A ray of light is incident at an angle of 20degrees to the normal on one face of an equilateral prism made in glass of refractive index 1.523. Find the total deviation produced.

118. psychology

Hello, can you lead me to how I would search for peer reviewed journal articles on freud psychoanalysis peer reviewed thanks

119. Chemistry Class

What is the molality of a solution made by adding 0.145 g of sodium acetate to 119 ml water? How do I find molality?

120. Physics

A 58-kg vampire and 176-kg werewolf clash during the Feat of Strength part of the annual celebration of Festivus. The werewolf velocity just before the clash is 7 m/s and is directed upwards, while the vampire velocity at the moment of the collision is

121. working with children from culturally diverse

which cultures are most closely aligned in valuing dependence over autonomy? American mainstream and Native American or Mexican American and Native American

122. Physics

A current of 4 A flows in a copper wire 10 mm in diameter. The density of valence electrons in copper is roughly 9 × 1028 m−3. Find the drift speed of these electrons. Answer in units of m/s.

123. Calculus

f(x)=(1/3)x–4 on the interval [2,9]. The domain of the inverse function is the interval [A,B] where A=? and B=?

124. physics

Digital COmmunication describes the development of digital storage in stages and different forms of digital storage.

125. economics

According to your text, our main sources of ethical standards are religion and A. philosophy. C. culture. B. social habit. D. circumstances

126. Psychology

To establish a cause and effect relationship, which should be used? Naturalistic observation An experiment A survey A test A case study Wouldn't you need to conduct an experiment..?

127. algebra

Use the quadratic formula to solve the equation. -4x^2-3x+2=0 Can someone please explain

128. Chemistry

Elemental analysis is performed on an organic liquid with a fishy odor. Vaporization of 260.0 mg of the compound in a 110 mL bulb at 100°C gives a pressure of 410.0 torr. What is the molar mass of this compound? whats the formula for this and do I need to

129. Chemistry

Number these in order of ease of hydrolysis. 1= easiest to hydrolyze 4=hardest to hydrolyze C6H5C(=O)OC66H5 C6H5C(=O)OCl C6H5C TRIPLE BOND N C6H5(=O)NHC6H5

130. math

If the area of a rectangle is 84 square inches.How do i find its length and width? Length is (x+3) width is (x-2).

131. physics

The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. A swimming polar bear climbs onto a piece of floating ice that has a volume of 3.25 m3. What is the weight of the heaviest bear that the ice can support without sinking completely

132. Algebra

A clothing company makes two basic products- shirts and pants. The company has 50 labor hours per day in the cutting department and 70 hours available in the sewing department. It takes 12 minutes to cut a shirt and 15 minutes to sew it. It takes 13

133. AP Physics B

A gadget of mass 17.85 kg ﬂoats in space without motion. Because of some internal malfunction, the gadget violently breaks up into 3 fragments ﬂying away from each other. The ﬁrst fragment has mass m1 = 4.12 kg and speed v1 = 3.57 m/s while the

134. physics

Digital Communication Describes in detail the stages of digital storage of information in different forms with examples such as CDs and DVDs help me please

135. Statistics

What critical t value would be needed to construct a 90% confidence interval on a sample of size 22? 1.717 1.323 2.080 1.321 1.721

136. Statistics

You have two independent samples of size 24 and 27. You conduct a hypothesis test and obtain a p-value. Using the conservative method what would you use for the degrees of freedom for comparison? 24 27 23 26 49

137. math

Dave swam 6 laps and did 9 dives at the swimming pool.crystal did 4 drives and swam 8 laps.how many more laps than drives did crystal and Dave do?

138. physics

Two blocks are connected by strings and hung from the ceiling as shown. Tension T1 is 187 N and tension T2 is 78 N. Find the mass of each block.

139. math

If half the batch of 6,000 vials are contaminated, what is the probability of finding no contaminated vials if only two vials are selected from the total amount produced?

Is sledding done better when the air temperate is 25 degrees Fahrenheit or 0 degrees Fahrenheit? Why?

141. Math

Jason made 34 bottles of flavored olive oil to give to his class. How many pints of flavored olive oil did Jason make if each bottle holds 8 fl oz? Does 16fl oz=1pt? And if It does how do I solve this problem

142. Math/Physics(Please check work)

For an experiment on specific heat capacities of metal in physics, I am trying to calculate my percent error but am having some trouble. After collecting my experimental data for c (cal/g) for the object that was used which was aluminum my results are:

143. Childhood Education

How does poverty relate to a child's risk for inadequate health and well-being?

144. physics

find energy of a single photon of light when you have 5.4*10^12 hertz.

145. Parent

the perimeter of the triangle is 55 inches. what is the value of X?

146. Math

3. Factor completely and solve. Check your solutions. Show all work. 6x^3 – 15x^2 – 36x = 0

147. Algebra

May you please help me understand how to do this? Thanks Give the slope of a line perpendicular to the given line. 1. y=3x+5

148. algebra

if x% of y = 15 then y% of x = what?

149. physics

determine the energy of a photon radio wave electromagnetic radiation. i know which formula to use 6.64*10^-34 what

150. Chemistry

NAME THESE COMPOUNDS a)HOC(=O)CH(OCH3)CH=CHCH3 B)LiOC(=O)C(OCH3)HCH=CHCH3 C)C6H5OC(=O)C(OCH3)HCH=CHCH3 D)CH3CH2NHC(=O)C(OCH3)HCH=CHCH3

151. Physics

What is the angular momentum (in J*s) of a mass of 1.45 kg which completes an orbit about a point 23.0 meters away every 5.30 seconds.

152. Chemistry

A pressurized can of whipped cream has an internal pressure of 1.080 atm at 25°C. If it is placed in a freezer at -8°C, what is the new value for its internal pressure (in atmospheres)? I did this but got a negative number that wasn't correct

153. Physics

a major league outfielder throws a baseball horizontally with a velocity of 22 m/s, released from a height of 1.8m. how far does it go before it hits the ground ?

154. PHYSICS

When the speed booster is set up horizontally at the edge of a table (h=1.11 m) it sends a toy car of mass m=0.06kg in the projectile motion, so that it lands at horizontal distance of x1=1.36 m away from the edge of the table. When the sam car with the

155. Math

How many yards in 48in? Can you explain how to do it?

156. Math

g=(50-(50/((1/(.0005+(1/10X)))+100-10X))*(100-10X)) Can this be simpler?

158. math

how do i find the equivalent decimal for 2 3/4

I am trying to draw a constitutional isomer for the compound CH3CH=CHCH3 but I am having some trouble. H-C-C=C-C-H I drew the first compound like this with more hydrogens on the Cs. How could I draw another strucutre?

160. Chem Ideal Gas Law

A 1.05 g sample of an ideal gas occupies 1.045 L at 20.0°C and 0.975 atm. What will be its volume at -8.6°C and 0.5 atm? I used PV=nRT for this. substituted P for 0.5 then n for 1.05, R .0821 then T for 264.4 K After doing this I got .0219 but it is

161. Math,Physics,Chemistry

Calculate the gravitational force of attraction between two protons in a chemical compound.Take the mass of proton as 0.0000000000000000000000000000167 kilogramme and the distance between the protons in a chemical compound is 0.000000000010 metre.

162. check my precalc

Rewrite each of the following as a product of linear factors 1. x^2+3 My Answer: (x+iroot 3)(x-iroot3) 2. x^2-2x+3 MA: (x-(1+iroot2))(x-(1-iroot2)) 3. x^4+x MA: IM not sure how to do it! can you help? 4. x^5-x^4+5x^3 MA:

163. Physics

A 45.4 kg of beer rolls down a 3.05 m long plank leading from the flatbed of a truck 0.880 m above the ground. Determine the amount of work (in Joules) done on the keg by gravity.

164. algebra

Describe a scenario that can be modeled with an inequality.

165. math

2. Solve 2/3 =(x+5)/3 A. x = –3 B. x = 3 C. x = 2/3 D. No answer shown

166. Math

Im really struggling with these proving identities problems can somebody please show me how to do these? I'm only aloud to manipulate one side of the equation and it has to equal the other side of the equation at the end Problem 1. tanx-cotx =

167. math

A blue candle is twice as long as a red one. The blue takes 6 hours to burn out and red takes 15 hours. After 5 hours, what fractional part of each is left? Thanks for your help!

168. Math

1. 5yd=15ft 2.3yd=108in 3.6mi=10560yd 4.4mi=21120ft 5.72in=6ft 6.8ft=2yd and 2ft or 2.6

169. math

27(2/3) 81(-3/2) how do i put those in radical form?

170. psych

Alfred Binet's work is associated with intelligence testing visual perception psychopathology comparative psychology classical conditioning

171. Psychology

Which statement best illustrates the idea that people adjust their behavior according to the gender schema theory? Choose one answer. a. Agnes tells her son that it is wrong to put makeup on his face and that boys don't wear dresses and skirts. b. Bart

172. Pre-Calculus

An open box is to be made from a piece of cardboard 11 in by 17 in, by cutting out a square of length x from each corner and turning up the sides. Express the volume V of the box as a function of the length x of the side of the square cur from each corner.

173. Math

What is 6x minus 6x? 0x or just 0?

174. Chemistry

Show the steps necessary to transform the compound on the left into the acid on the right (CH3)3CCH2BR ------------------>(CH3)3CCH2C(=O)OH

175. Pre-Cal

How do I do these questions? I'm supposed to prove them so that both sides are the same and I'm only supposed to manipulate one side and leave the other side alone but I'm stuck. Problem 1. (secx/cosx)-(cscx/sinx)=tan^2x-cot^2x Problem 2.

176. math

A line has slope –. Through which two points could this line pass? A.(12, 13), (17, 10) B.(16, 15), (13, 10) C.(0, 7), (3, 10) D.(11, 13), (8, 18) I think it is A?

177. University Physics

A 60-kg vampire and 194-kg werewolf clash during the Feat of Strength part of the annual celebration of Festivus. The werewolf velocity just before the clash is 5 m/s and is directed upwards, while the vampire velocity at the moment of the collision is

A hydraulic cylinder with a radius of 0.0268 m has a piston on the left end and a safety valve at the right end. The safety valve is a circular opening with a radius of 0.00639 m, sealed with a disk. The disk is held in place by a spring (spring constant =

179. IT

So how do industries deal with the impacts of mobile computing and convergence?

asked by Sam Cook
180. composition&communication

I am in the middle of a draft for my final essay I would like to know what you think and if you think there is something that should be added, deleted, or changed please tell me. This essay is a compare/contrast essay about flat irons and curling irons. I

181. us history

southern members of congress resisted antislavery efforts by

182. math

square root of 3 to the second power minus 5 divided by 8

asked by jack bakersfeild
183. English

????? Is to rock. Answer needs to have these letters. Clerad

184. Chem

A gas mixture in a 3.100 L container at 415°C contains 1.30 g each of Ar, CO, and CH4. Find the partial pressure of Ar (in atmospheres). Find the total pressure of the gas mixture (in atmospheres). Find the mole fraction of CO. Do I use PV=nRT for partial

185. Math

How do you round 0.0694 to the greatest place?

186. Math

(x+1)/3 + (3x - 2)/4 = (x + 5)/8 - (7x - 1)/6 - 37/12 I need the steps please...I know the answer

187. Chemistry

A pressurized can of whipped cream has an internal pressure of 1.080 atm at 25°C. If it is placed in a freezer at -8°C, what is the new value for its internal pressure What formula do I use for internal pressure?

188. math

-16343-x=-343 Find x

189. math

I have 92 quarters, 46 dimes and 23 nickels in my jar. how money do i have

190. math

On a geo board how would you draw a right triangle that showed 4 units squared? would you draw it with the height being the length of 4 squares and the base being the length of 2 squares which would be 1/2 (b x h) which would be 1/2 (2 x 4) = 4 units

191. maths

If * stands for -, /stands for +, +stands for *, then which of the following is TRUE? A) 32/14*6+40-8=44.8 B) 14*8/6+40-8=16.8 c) 32*6/14+32-8=9.9 D) 32/6*14+32-8=18.9

192. Science

Each student is pulling with a force of 10 newtons

193. Physics

A 5.00 cm tall candle is placed at a distance of 50.0 cm from a double convex lens having a focal length of 15.0 cm. What is the magnification of the image? -0.429 -2.33 0.429 2.33

194. math

What fraction is the same as 72%

195. English

We express our love for each other by exchanging gifts. (for each other) Is that a prepositional phrase? What is (by exchanging gifts)

196. Childhood Education

What items would you first look for to determine whether lead is present in the environment where children are present?

197. Math

A mower can cover 7.2 acres per hour. A newer model can cover 8.1 acres per hour. What percent more can the newer model cover?

198. Science

Use Dr.Vents results. Examine the graph . To increase the solubility , would you increase or decrease the temperature .

199. mg495

You learn that 25 percent of the cost of goods sold and operating expense figures for 2009 are fixed costs that will not change in 2010. Reconstruct the pro forma income statement.

200. geometry

the heigth of a tree is 7.2 m its shadow is 2.4 m the meter stick is 1 m tall what is the length of te metersticks shadow?

201. math

27(2/3) 81(-3/2) how do i put those in radical form?

202. math

My hundredths digit is the product of 3 x 2. My tenths digit is the multiple of 3 that comes before the digit that is in the hundredths place. My thousandths digit could not be any greater. What number am I?

203. Social Studies

Did The CElts celebrate New Year's Eve in autumn?

204. Psychology

To measure the relationship between age and cell phone use, a researcher should use a Correlation Central tendency A histogram Standard deviation A t test

205. composition&communication

I have to think of situations that asking a question in my introductory paragraph wouldn't work but I can't think of any, any ideas?

206. Math

After a reflection over the x-axis I have to find the coordinates of A1, B1, C1 I am having trouble with b1. A(1,4) B(3,-2) C(4,2) The reflection should be: A1 should be (1,-4) B1 ?????? C1 should be (4,-2) Can younhelp with the b1 coordinates and check my

207. Chemistry

Show the steps necessary to transform acid on left to compound on right... Make sure you use SOCl3.................. (CH3)3CCH2C(=O)OH ----------> (CH3)3CCH2C(=O)OCH2CH=CH2 (CH3)3CCH2C(=O)OH-----------> (CH3)3CHC(=O)N(CH2CH3)2

208. Math

When 8 children go on a picnic, 6/8 of them wear jeans, how many wear jeans

209. math

What is the slope of a vertical line? –5 –2 2 5

210. math

7/12, 14/30 approximation which is greater

211. science

although each place on earth has its own climate,they can be grouped based on certain overall characteristics.what are the keys factors that scientist use to determine the climate of a particular place

212. Social studies

What was the largest city in the 13 English colonies

213. Chmistry

what numerical values of l are possible for n=4

214. 5th grade math

tulips are planted every four feet in a rectangular garden the sides are 16 feet and 12 feet how many tulips are there?

215. Programming-Array

If i have a string with a word 'today' in it. If a user inputs a char (lets say b). how do I right the array to make it see if the char "b" is in the string today. LOOP??? int i; for(i=0; i

216. thermodynamic

1.5kg water in a closed system initiallu have a pressure of 700 kPa and x=0.7.Then,water had been expanding at constant temperature process until the pressure decrease to 150kpa.During the process,1000kJ heat was transferred to the system.Determine the

asked by SYAZWANI URGENT
217. math

what is the work of the square root of 3 to the second power minus 5 divided by 8

asked by jack bakersfeild
218. elementary

please give me response.i don't have any idea from this science project. research graphic organizer we select dolphin.how to prepare that dolphin.which one is the best thing.can u explaine me

219. english 90

what is a strong theies statement when i start off saying it involves color, gender, and discrimination

asked by jamisha harper

For an experiment on specific heat capacities of metal in physics, I am trying to calculate my percent error but am having some trouble. After collecting my experimental data for c (cal/g) for the object that was used which was aluminum my results are: