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

    asked on January 21, 2012

  2. physics

    Influenced by the gravitational pull of a distant star, the velocity of an asteroid changes from from +19.0 km/s to βˆ’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

    asked on September 15, 2015

  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

    asked on August 13, 2012

  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

    asked on October 15, 2015

  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?

    asked on September 13, 2016

  7. 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)

    asked on July 3, 2014

  8. 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

    asked on July 3, 2014

  9. 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

    asked on May 20, 2010

  10. 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

    asked on January 3, 2012

  11. 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?

    asked on November 21, 2014

  12. algebra

    a number is more than 12 units from 0

    asked on October 15, 2015

  13. Physics

    A plumb bob (a mass m hanging on a string) is deflected from the vertical by an angle ΞΈ 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

    asked on April 28, 2012

  14. 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 16𝑑^2 feet in 𝑑 seconds. a) Calculate the average velocity in the

    asked on August 14, 2019

  15. 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

    asked on March 5, 2012

  16. 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 _____.

    asked on January 26, 2019

  18. 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?

    asked on August 28, 2011

  19. 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) =

    asked on July 3, 2014

  20. 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?

    asked on December 6, 2016

  21. 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

    asked on July 24, 2013

  22. Calculus

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

    asked on November 6, 2011

  23. 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

    asked on March 25, 2016

  24. 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?

    asked on September 25, 2013

  25. 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 +1πœ‡C , mass B has a charge of βˆ’1πœ‡C , and mass C has a charge of +2πœ‡C . At the

    asked on July 28, 2019

  26. Honors Chemistry

    What is the Lewis dot diagram for C2Cl2?

    asked on December 6, 2011

  27. Calculus

    Find the values of the constants π‘Ž, 𝑏 and 𝑐 for which the following function is differentiable. (Give π‘Ž and 𝑏 in terms of 𝑐.) 𝑓(π‘₯)={𝑐π‘₯^2+4π‘₯+1, π‘₯β‰₯1 & π‘Žπ‘₯+𝑏, π‘₯

    asked on August 14, 2019

  29. physics

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

    asked on February 23, 2012

  30. 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 +1πœ‡C , mass B has a charge of βˆ’1πœ‡C , and mass C has a charge of +2πœ‡C . At the

    asked on July 28, 2019

  31. 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

    asked on January 29, 2009

  32. 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?

    asked on May 20, 2010

  33. 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?

    asked on June 17, 2014

  34. 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

    asked on September 21, 2012

  35. 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?

    asked on February 4, 2012

  36. 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

    asked on February 23, 2012

  37. 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

    asked on September 7, 2019

  38. 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

    asked on June 1, 2013

  40. Calculus

    For the following function, find the values of the constants π‘Ž and 𝑏 for which the function is continuous, but not differentiable. 𝑓(π‘₯)={π‘Žπ‘₯+𝑏,π‘₯>0 & sinπ‘₯,π‘₯≀0.

    asked on August 14, 2019

  41. 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?

    asked on February 11, 2012

  42. chemistry

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

    asked on May 10, 2010

  43. 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

    asked on September 15, 2019

  44. Calculus

    Suppose in January, 𝑑=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

    asked on September 15, 2019

  45. 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 ?

    asked on September 7, 2019

  46. 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.

    asked on October 26, 2010

  47. 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

    asked on April 20, 2011

  48. 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.)

    asked on July 26, 2013

  49. 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,

    asked on March 26, 2012

  51. Calculus

    Find the linear approximation of 𝑓(π‘₯)=√(π‘Ž+𝑏π‘₯) at π‘₯=0 . (Here π‘Ž and 𝑏 are constants; assume π‘Ž>0 .)

    asked on September 15, 2019

  52. 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?

    asked on February 11, 2012

  53. 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?

    asked on January 22, 2013

  54. 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?

    asked on May 16, 2014

  55. Science

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

    asked on November 14, 2012

  56. physics

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

    asked on February 11, 2012

  57. 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?

    asked on July 3, 2014

  58. Algebra, URGENT!! HELP!

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

    asked on January 27, 2014

  59. 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?

    asked on November 13, 2012

  60. 6th grade

    what is 3/10 divided by 13/14

    asked on October 20, 2010

  62. 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

    asked on June 13, 2006

  63. 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?

    asked on November 13, 2012

  64. Calculus

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

    asked on September 12, 2019

  65. 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

    asked on September 21, 2012

  66. 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

    asked on September 18, 2007

  67. Economics

    2. Suppose Fred has a utility function of the form U = X Β½ Y Β½ . 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

    asked on January 21, 2009

  68. 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. ΒΏCΓ³mose

    asked on May 20, 2011

  69. 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

    asked on September 26, 2015

  70. 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?

    asked on November 13, 2012

  71. chemistry

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

    asked on May 10, 2010

  73. physics

    A 1.13 Γ— 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

    asked on December 16, 2012

  74. 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?

    asked on November 13, 2012

  75. 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 MarΓ­a 2. las sillas de ti 3. el hermano de mΓ­ 4. la computadora de tu y yo 5. la mesa de usted 6. la mesa

    asked on June 23, 2011

  76. 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?

    asked on May 20, 2010

  77. 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?

    asked on February 17, 2009

  78. Math

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

    asked on March 10, 2012

  79. 9th grade Math

    what is the probabilty of spinning a divisor of 12?

    asked on August 18, 2010

  80. Math

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

    asked on April 7, 2010

  81. 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

    asked on September 18, 2007

  82. business law

    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

    asked on October 17, 2015

  84. 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.

    asked on February 20, 2012

  85. 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?

    asked on February 4, 2012

  86. 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.

    asked on May 20, 2010

  87. 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

    asked on April 7, 2010

  88. 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

    asked on February 19, 2009

  89. ECONOMICS

    Sorry, the last Question didn't post Suppose Fred has a utility function of the form U = X Β½ Y Β½ . 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

    asked on January 21, 2009

  90. Physics

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

    asked on June 12, 2014

  91. 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

    asked on February 11, 2012

  92. 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

    asked on February 11, 2012

  93. 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.

    asked on December 5, 2008

  95. 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.

    asked on February 6, 2017

  96. 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

    asked on September 24, 2012

  97. 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

    asked on February 23, 2012

  98. 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.

    asked on September 19, 2011

  99. us history

    Why do some people consider Andrew Jackson a tyrant?

    asked on May 18, 2010

  100. chemistry

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

    asked on May 10, 2010

  101. algebra

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

    asked on November 4, 2009

  102. 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

    asked on March 26, 2009

  103. ECON

    Suppose the marginal cost of pollution reduction is Β½ 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

    asked on February 6, 2009

  104. 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

    asked on November 22, 2008

  106. 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 +

    asked on October 16, 2007

  107. 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

    asked on May 25, 2015

  108. Calculus

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

    asked on November 6, 2011

  109. Calculus

    Differentiate f(x)=(x^(3)-8)^(2/3) Please Show Work

    asked on November 6, 2011

  110. Calculus

    Graph f(x) = 4^(x - 1) Please show work

    asked on November 6, 2011

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