# Brett

Most popular questions and responses by Brett
1. ## Physics

An explorer is caught in a whiteout (in which the snowfall is so thick that the ground cannot be distinguished from the sky) while returning to base camp. He was supposed to travel due north for 5.7 km, but when the snow clears, he discovers that he

2. ## physics

Influenced by the gravitational pull of a distant star, the velocity of an asteroid changes from from +19.0 km/s to −19.4 km/s over a period of 1.85 years. (a) What is the total change in the asteroid's velocity? (Indicate the direction with the sign of

3. ## Geometry

Suppose J is between H and K. Use the Segment Addition Postulate to solve for x. Then find the length of each segment. HJ=2x+5 JK=3x-7 KH=18

4. ## Algebra

a tuxedo rental shop rents tuxedos with sleeve lengths from 20 inches to 40 inches. The shop says the length of the sleeves should be about 1.2 times a person's arm length. Write and solve a compound inequality that represents the arm lengths of people the

5. ## chem

A ground state hydrogen atom absorbs a photon of light having a wavelength of 93.03 nm. It then gives off a photon having the wavelength of 2165 nm. What is the final state of the hydrogen atom?

6. ## Chemistry

Given the Data: N2(g) + O2g) = 2NO(g) delta H = 180.7kj, 2NO(g) + O2(g) = 2NO2(g) delta H = 0113.1kj, 2N2O(g) = 1N2(g) + O2(g) delta H = -163.2kj. Using Hess’s Law calculate delta H for the reaction: N2O(g) + NO2(g) = 3NO(g)

7. ## Chemistry

A solution of hydrogen peroxide, H2O2, is titrated with potassium permanganate, KMnO4, according to the following equation: 5H2O2 + 2KMnO4 + 3H2SO4 = 5O2 + 2MnSO4 + 8H2O + K2SO4. It requires 46.0 mL of 0.145 Mol/L KMnO4 to titrate 50.0 mL of the solution

8. ## Geometry

Need help finding dimensions of a triangular prism. It has a volume of 900 cubic inches. Two of the dimensions are consecutive even numbers. Two of the dimensions are multiples of 5. All the dimensions are less than 16, but greater than 6. All lengths are

9. ## Chem 30

1) Suppose the mass of the NaOH used in a reaction was doubled. What would you expect to happen to the heat given off by the reaction? Explain your answer. 2)Again, suppose the mass of the NaOH used in a reaction was doubled. What would you expect to

10. ## college algebra

An investment initially worth \$5300 earns 7.7% annual interest, and an investment initially worth \$8000 earns 5.6% annual interest, both compounded annually. How long will it take for the smaller investment to catch up with the larger one?

11. ## algebra

a number is more than 12 units from 0

12. ## Physics

A plumb bob (a mass m hanging on a string) is deflected from the vertical by an angle θ due to a massive mountain. A) Make an estimate of the mass of Mt. Everest, assuming it has the shape of a cone 3910 m high and base of diameter 3910 m. Assume its mass

13. ## Calculus

A test tube is knocked off a tower at the top of a building that is 400 feet above the ground. (For our purposes, we will assume that air resistance is negligible.) The test tube drops 16𝑡^2 feet in 𝑡 seconds. a) Calculate the average velocity in the

14. ## Physics

A 73.3 kg man steps out a window and falls (from rest) 1.09 m to a sidewalk. What is his speed just before his feet strike the pavement? 4.62 m/s If the man falls with his knees and ankles locked, the only cushion for his fall is a 0.510 cm give in the

15. ## science

A series RL circuit contains two resistors and two inductors. The resistors are 33 W and 47 W. The inductors have inductive reactances of 60 W and 30 W. Angle theta is _____.

16. ## Trig

A soccer goal is 24 feet wide. Point A is 40 feet in front of the center of the goal. Point B is 40 feet in front of the right goal post. Which angle is larger A or B? How much larger?

17. ## Chemistry

Using standard enthalpies information, calculate the standard enthalpy change for this reaction: a) (thermite reaction) 2Al(s) + Fe2O3(s) = Al2O3(s) + 2Fe(s) b) Mg(OH)2(s) = MgO(s) + H2O(I) c) N2O4(g) + 4H2(g) = N2(g) + 4H2O(g) d) SiCl4(I) + 2H2O(I) =

18. ## physics

What is the time constant of a 10 H inductor and a 200 ohm resistor connected in series? Is my work correct? I did: T= L/R = 10 H divided by 200 ohm = 0.05 seconds = 50 milliseconds mS. Is that correct?

19. ## Physics

Two physical pendulums (not simple pendulums) are made from meter sticks that are suspended from the ceiling at one end. The sticks are uniform and are identical in all respects, except that one is made of wood (mass = 0.17 kg) and the other of metal (mass

20. ## Calculus

Find The Derivative y=5x^(2)e^(3x) Please Show Work

21. ## physics

A 2.00 kg ball moving to the right at 10.0 m/s makes an off-center collision with a stationary 3.00 kg ball. After the collision, the 2.00 kg ball is deflected upward at an angle of 30o from its original direction of motion and the 3.0 kg ball is moving at

22. ## Probability

an urn contains 40 red chips and sixty white chips. six chips are drawn out and discarded, and a seventh is drawn. what is the probability that the seventh chip is red?

23. ## AP Physics

Consider four masses arranged (clockwise from A at the top) in a cross (looks like a giant plus symbol). Each is 1cm from the center of the cross. Mass A has a charge +1𝜇C , mass B has a charge of −1𝜇C , and mass C has a charge of +2𝜇C . At the

24. ## Honors Chemistry

What is the Lewis dot diagram for C2Cl2?

25. ## Calculus

Find the values of the constants 𝑎, 𝑏 and 𝑐 for which the following function is differentiable. (Give 𝑎 and 𝑏 in terms of 𝑐.) 𝑓(𝑥)={𝑐𝑥^2+4𝑥+1, 𝑥≥1 & 𝑎𝑥+𝑏, 𝑥

26. ## physics

What is the rotational speed of the minute hand on a clock? Convert from rad/s to rev/s

27. ## Physics

Consider four masses arranged (clockwise from A at the top) in a cross (looks like a giant plus symbol). Each is 1cm from the center of the cross. Mass A has a charge +1𝜇C , mass B has a charge of −1𝜇C , and mass C has a charge of +2𝜇C . At the

28. ## Economics

From 1962 to 1965, federal spending on non-defense-related education and training rose from \$9.6 billion to \$19.5 billion, while from 2001 to 2004, it rose from \$178.4 billion to \$217.5 billion. Given that the Consumer Price Index ( in January) was 30.0 in

29. ## Geometry

I need to find the dimensions of this rectangular prism. It has a volume of 108 cubic inches. The length and width of the base are identical. The height is half of the length. Can you help explain how to do this given this information?

30. ## Chemistry

1. Nitric acid is produced via the following equation: 3 NO2 + H2O = 2HNO3 + NO. How many grams of NO2 are required to produce 7.5 grams of HNO3?

31. ## Chemistry

I have 3 I don't understand how to do. A 33.2 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 12.3 grams. What was the percent iron in the sample

32. ## physics

A 610 kg satellite orbits at a distance from the Earth's center of about 5.3 Earth radii. What gravitational force does the Earth exert on the satellite?

33. ## physics

Cliff and Will are carrying a uniform 2.0m board of mass 69kg. Will is supporting the board at the end while cliff is 0.6m from the other end as shown in the following figure. Cliff has attached his lunch to his end of the board, and the tension in the

34. ## Calculus

A. In a circuit with resistance 10 ohms, power 𝑃 (measured in watts) is equal to 10𝐼^2 , where 𝐼 is the current measured in amperes. When 𝐼=6 amperes, what is the rate of change of 𝑃 with respect to 𝐼 ? B. If we additionally know that

35. ## programming

You have the final sales figures for the four quarters in 2010 for Bennets Used Auto Sales, and you are to design a program that asks for the sales figures, computes the total sales for the year, and calculates and displays the average quarterly sales for

36. ## Calculus

For the following function, find the values of the constants 𝑎 and 𝑏 for which the function is continuous, but not differentiable. 𝑓(𝑥)={𝑎𝑥+𝑏,𝑥>0 & sin𝑥,𝑥≤0.

37. ## physics

A woman with a mass of 56 kg runs at a speed of 8 m/s and jumps onto a giant 30 kg skateboard initially at rest. What is the combined speed of the woman and the skateboard?

38. ## chemistry

A 4.30 g nugget of pure gold absorbed 293 J of heat. The initial temperature was 23.0°C. What was the final temperature?

39. ## Calculus

Evaluate the derivatives by implicit differentiation. Assume all letters represent constants, except for the independent and dependent variables occurring in the derivative. 𝑃𝑉^𝑐=𝑛𝑅𝑇

40. ## Calculus

Suppose in January, 𝑡=1 , a lake is covered by 2 square meters of algae. Every month, the area covered by algae doubles. (Assume that the growth occurs continuously.) Find the growth rate as a function of time with units square meters per month. Enter t

41. ## Calculus

In a circuit with resistance 10 ohms, power 𝑃 (measured in watts) is equal to 10𝐼2 , where 𝐼 is the current measured in amperes. When 𝐼=6 amperes, what is the rate of change of 𝑃 with respect to 𝐼 ?

42. ## chemistry

A buffer solution contains 0.200 M NH3 and 0.250 M NH4Cl. What is the pH of the buffer solution after the addition of 10.0 mL of 0.100 M NaOH to 50.0 mL of the buffer? Kb for NH3 is 1.8 x 10-5.

43. ## physics

Search: The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.029 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.049 kg and is initially at

44. ## Physics

When a 81.0 kg. person climbs into an 1400 kg. car, the car's springs compress vertically 1.5 cm. What will be the frequency of vibration when the car hits a bump? (Ignore damping.)

45. ## Physics

A 14.6-g marble is dropped from rest onto the floor 1.23 m below. If the marble bounces straight upward to a height of 0.665 m, what is the magnitude of the impulse delivered to the marble by the floor. If the marble had bounced to a height of 0.884 m,

46. ## Calculus

Find the linear approximation of 𝑓(𝑥)=√(𝑎+𝑏𝑥) at 𝑥=0 . (Here 𝑎 and 𝑏 are constants; assume 𝑎>0 .)

47. ## physics

A coach is hitting pop flies to the outfielders. If the baseball (mass = 145 g) stays in contact with the bat for 0.08 s and leaves the bat with a speed of 75 m/s, what is the average force acting on the ball?

48. ## Chemistry

Four ice cubes at exactly 0 degrees Celsius having a total mass of 55.0g are combined with 120g of water at 77 degrees Celsius in an insulated container. If no heat is lost to the surroundings, what will be the final temperature of the mixture?

49. ## Algebra

Using the formula h=-16^2+vt+s Answer the question: A rocket is shot upward off a 25 foot high balcony with an initial velocity of 96 feet per second. How many seconds will it take until the rocket hits the ground?

50. ## Science

A car of mass 1190 kg is on an icy driveway inclined at an angle of 28◦ If the incline is frictionless, what is the acceleration of the car?

51. ## physics

A .145kg baseball is thrown at 40 m/s (~89.5mph). What is the momentum of the baseball?

52. ## Chemistryq

A cylinder of gas contains 96.0 g of oxygen gas, O2. If the volume of the cylinder is 9.00 liter and at 25.0 degrees C. What is the pressure of O2 in the cylinder?

53. ## Algebra, URGENT!! HELP!

Rewrite the following as a perfect square: 144b^18

54. ## physics

The net external force on the propeller of a 3.9 kg model airplane is 6.8 N forward. What is the acceleration of the airplane?

what is 3/10 divided by 13/14

56. ## chemistry

If you know that the mass concentration of a NaCl solution is 58.5 g/L, the molar concentration (mol/L) of the solution is ? can sum1 help me plz 1 mol of NaCl has a mass of what? 58.5 g NaCl x (1 mol NaCl/molar mass NaCl) = mols NaCl on 58.5 gg NaCl. Mols

57. ## physics

A soccer ball kicked with a force of 14.8 N accelerates at 6 m/s2 to the right. What is the mass of the ball?

58. ## Calculus

The derivative of an inverse: Suppose that 𝑔=𝑓^−1 (f inverse) . If 𝑔(3)=2 , what is 𝑔′(3) ? Express your answer solely in terms of 𝑓 , not 𝑔 .

59. ## Chemistry

A 28.4288 g sample of impure magnesium car- bonate was heated to complete decomposition according to the equation MgCO3(s) ! MgO(s) + CO2(g) . After the reaction was complete, the solid residue (consisting of MgO and the original impurities) had a mass of

60. ## Micro econ

1: Suppose John had a utility function of U=X^2/3Y^1/3 . Derive Johns demand function from his utility function showing all the necessary steps. i know that the MUx=MUy and first i derive the equation to 2/3X^-1/3 1/3Y^-2/3 then im stuck i need help with

61. ## Economics

2. Suppose Fred has a utility function of the form U = X ½ Y ½ . Fred has an income of \$100, good X costs \$1.00, and good Y costs \$2.00. How much of good X and how much or good Y will Fred buy? Ive already drawn my graph. i know that fred could buy 100

62. ## spanish1

If you could tell me the right answers, and an explanation why each is right thatd be great! thank you 1. A boot verb is irregular A in four subjects B in two subjects C in three subjects D in one subject E in five subjects F in all subjects 5. ¿Cómose

63. ## chem

a) Potassium-40 undergoes three different modes of radioactive decay (Beta decay, Positron decay, and Electron Capture decay). Write balanced nuclear reactions for each of these decay modes. Are the products stable (not radioactive)? b) Potassium-40 has a

64. ## physics

The net external force on the propeller of a 3.9 kg model airplane is 6.8 N forward. What is the acceleration of the airplane?

65. ## chemistry

How much heat is evolved when 269 g of ammonia gas condenses to a liquid at its boiling point?

66. ## physics

A 1.13 × 103 kg car accelerates uniformly from rest to 10.6 m/s in 3.22 s. What is the work done on the car in this time interval? Answer in units of J

67. ## physcis

A soccer ball kicked with a force of 14.8 N accelerates at 6 m/s2 to the right. What is the mass of the ball?

68. ## spanish

Change the following constructions to an adjetivo posesivo and noun according to the example: Example: la mesa de ella su mesa 1. el gato de Juan y María 2. las sillas de ti 3. el hermano de mí 4. la computadora de tu y yo 5. la mesa de usted 6. la mesa

69. ## Geometry

A rectangular prism has the following characteristics. It has a volume of 71 cubic inches. The sum of the three lengths is 14. The width is 2 less than the length. The length is 5 more than the height. What are the dimensions of this rectangular prism?

70. ## Math

Photography reprints cost \$0.52 each at a local photo shop. Through the mail, they cost \$0.44 each plus \$1.20 postage and handling. How many reprints must a customer purchase to make it less expensive to use mail order?

71. ## Math

Which represents the type of sequence: 12, 22, 30, 36, 41, …? neither arithmetic nor geometric both arithmetic and geometric arithmetic geometric

what is the probabilty of spinning a divisor of 12?

73. ## Math

the length of a rectangle is 3cm more than twice the width. the perimeter is 84cm. find the length

74. ## Economics

Ive been stuck on this forever now if someone could please walk me through it i was appreciate it: 1: Suppose John had a utility function of U=X^2/3Y^1/3 . Derive Johns demand function from his utility function showing all the necessary steps. i know that

Gina and Jules were shopping together when they decided to buy lottery tickets. Each bought one ticket and agreed that if either won, they would split the winnings. Two days later, Gina discovered that she had won. She refused to share with Jules. 2 of 2

76. ## physics

A car of mass 907 kg coasts on a level road, starting with an initial speed of 14.2 m/s and coming to rest 15.2 s later. Find the frictional force acting on the car.

77. ## physics

A satellite orbits at a distance from the Earth's center of about 4.40 Earth radii and takes 13.0 hours to go around once. What distance (in meters) does the satellite travel in one day?

78. ## Geometry

We have a triangular prism that has the following characteristics. It has a volume of 360 cubic inches. The base of the triangle is twice the height of the triangle. The difference between the height of the prism and the height of the triangle is 4 inches.

79. ## math

the length of a rectangle is 3cm more than twice the width. the perimeter is 84cm. find the length Please show me the steps on how you get the answer. Thanks

80. ## college Econ

Suppose Fred and Ethel need to divide 20 pizza slices and 10 cans of beverage. Fred's utility function is given by the equation U=Min(Z,B), where Z is the amount of pizza and B is the amount of beverage. Ethel's utility is given by the equation

81. ## ECONOMICS

Sorry, the last Question didn't post Suppose Fred has a utility function of the form U = X ½ Y ½ . Fred has an income of \$100, good X costs \$1.00, and good Y costs \$2.00. How much of good X and how much or good Y will Fred buy? Be sure to show all your

82. ## Physics

Merry go round is push by a 100 kg man Radius is 2 m how much force is exerted. Maximum force in newtons

83. ## physics

The Earth orbits the Sun once per year.What is the centripetal force keeping the Earth in orbit? T = 1 year (convert to seconds) r = 1.5e+11 meters m = 6e+24 kg

84. ## physics

Phrank (36.4kg) runs at 2.2 m/s and jumps onto a large stationary skateboard (2.3kg) on which Phrancine (22.7kg) is sitting. After the collision, Phrank, Phrancine, and the skateboard move at 1.3 m/s. Find the momentum before and after the collision along

85. ## Art

Compare and contrast the representation of weight and space in the painting of The Good Shepherd in the Catacomb of Saints Pietro and Marcellino and the mosaic of Justinian and Attendants in Ravenna’s Church of San Vitale.

86. ## physics

A hippo has a mass of 6000kg. When standing on 4 feet, how much pressure is exerted on the ground? Assume each foot has an area of 0.10 square meter. Show your work.

87. ## Chemistry

Find the thetrical formula for .012 mol of H20, .0056 moles of Cl2 and .0060 of copper with a formula like this CuCl*H20 *=point in center

88. ## physics

A 50 gram ball enters a a pendulum with mass 200 g. The pair then swings up to a height of 10 cm. Find the velocity at which the pair move immediately after the collision. Your answer is incorrect. 1.4 m/s Find the initial velocity of the ball before the

89. ## Physics

What net external force is required to give a 35.7 kg suitcase an acceleration of 2.8 m/s2 to the right? Answer in units of N.

90. ## us history

Why do some people consider Andrew Jackson a tyrant?

91. ## chemistry

The temperature of a sample of water increases from 20.7°C to 45.7°C as it absorbs 5675 J of heat. What is the mass of the sample?

92. ## algebra

how do i factor 8m^2-6mn-9n^2

93. ## Economics (Equilibrium)

Suppose fred ethel ricky and lucy have the following demand functions for a public good Qf= 40-1/2p Qe= 20-p Qr= 30-1/2p Ql= 50-p The good can be produced at a constant cost of 5 dollars Calculate the Lindahl Equilibrium I know that the lindhal is the

94. ## ECON

Suppose the marginal cost of pollution reduction is ½ R, where R is the amount of pollution reduced given in percentage terms. The marginal benefit of pollution reduction is 90 - R. The government plans to auction off marketable permits in order to reduce

95. ## college grammar

Iknow the right answers but I cannot explain why they are right. Please help using the indicator of what to look for. Pronoun-antecedent agreement 12a. When a driver wants to buy a new vehicle, he or she usually test drives them. COM 150 12b. When a driver

96. ## MICROECONOMICS

Hello ive been struggling with this problem for about 2 days now could someone walk me through it? Suppose a firm faces a downward sloping demand curve given by the equation Q = 100 - (1/3)P. The firm's cost function is given by the equation C = 30 +

97. ## Physics/Dynamics

A truck has wheels of diameter 0.9m, a weight of 8000kg, a wheel-base of 4m, and a tray height of approximately 1.2m. The truck’s weight distribution is 50% on the rear wheels and 50% on the front wheels. The truck’s front springs have a combined

98. ## Calculus

Solve the exponential equation for t. Round your answer to three decimal places if necessary. e^(0.08t)=4 Please show work