Most popular questions and responses by nate
  1. physics-energy

    A toy gun uses a spring to project a 5.3 g soft rubber sphere vertically. The spring constant is 8.0 N/m, the barrel of the gun is 15 cm long, and a constant frictional force of 0.032 N exists between barrel and projectile. How high does the projectile go

    asked on February 19, 2010
  2. physical science

    a 1.0 kg sample of metal with a specific heat of 0.50KJ/kgCis heated to 100.0C and then placed in a 50.0g sample of water at 20.0C. What is the final temperature of the metal and the water? I can't figure this out. Is the answer room temperature???

    asked on November 7, 2007
  3. calculus

    If a snowball melts so that its surface area decreases at a rate of 3 cm2/min, find the rate at which the diameter decreases when the diameter is 9 cm. (Give your answer correct to 4 decimal places.)

    asked on November 29, 2011
  4. Calculus

    A Norman window has the shape of a rectangle surmounted by a semicircle. (Thus, the diameter of the semicircle is equal to the width of the rectangle.) If the perimeter of the window is 25 ft, find the dimensions of the window so that the greatest possible

    asked on November 18, 2013
  5. physics

    A gray kangaroo can bound across a flat stretch of ground with each jump carrying it 9.3 m from the takeoff point. If the kangaroo leaves the ground at a 17.6 degree angle, what is its takeoff speed?

    asked on September 8, 2012
  6. phsycis

    A tight-rope walker walks across a 30.0 m long wire tied between two poles. The center of the wire is displaced vertically downward by 1.0 m when he is half-way across. If the tension in both halves of the wire at this point is 3675 N, what is the mass of

    asked on September 20, 2012
  7. Physics

    A 69.5 kg painter is on a uniform 30.0 kg scaffold supported from above by ropes . There is a 5.0 kg pail of paint to one side, as shown. The scaffold is 6 m long. 1.0 m on both ends and 4 m in the middle. From the left end at 1.0 m to the pail is 1.0 m.

    asked on November 3, 2010
  8. physics

    A construction worker is carrying a load of 40 kilograms over his head and is walking at a constant velocity. If he travels a distance of 50 meters, how much work is being done?

    asked on October 8, 2014
  9. physics

    A rocket is fired straight up through the atmosphere from the South Pole, burning out at an altitude of 208 km when traveling at 5.8 km/s. (a) What maximum distance from Earth's surface does it travel before falling back to Earth?

    asked on March 26, 2010
  10. Math

    A round silo is 40 feet tall and has a 25 foot radius. How high would a load of 37000 cubic feet of grain fill the silo? Express your answer rounded to the nearest foot.

    asked on October 4, 2016
  11. Physics

    A small sphere X of mass M is placed a distance d from a point mass. The gravitational force on the sphere X is 90 N. Sphere X is removed and a second sphere Y of mass 4M is placed a distance 3d from the same point mass. What is the gravitational force on

    asked on May 3, 2018
  12. Physics

    I got all but this problem. A 0.145-kg baseball is pitched at 42.0 m/s. The batter hits it horizontally to the pitcher at 58 m/s. A. Find change in momentum? Is it =.145*58-(-.145*42)=1.45-kg m/s? B. If bat and ball are in contact for 4.6 x 10-4 s, what is

    asked on February 14, 2010
  13. computer science

    Suppose we are executing the DGIM algorithm for approximate counting of bits in a stream. Let the window size be 1000. (a) What is the largest possible bucket size in the representation of this stream? (b) Suppose each of the last 1000 bits is 1. What is

    asked on June 24, 2019
  14. Physics

    An ice skater spins with his arms outstretched. When he pulls his arms in and raises them above his head he spins much faster than before. Did a torque act on the ice skater? If not how could his angular velocity have increased?

    asked on February 12, 2010
  15. chemistry

    Fe(S)+ 2 HCl(ag) --> FeCL2(ag)+ H2(g What mass of H2 (g) is produced from the reaction of 5.2 Fe(s) with excess hydrochloric acid?

    asked on October 13, 2010
  16. Physics -energy

    A 80 kg diver steps off a 10 m tower and drops from rest straight down into the water. If he comes to rest 5.0 m beneath the surface, determine the average resistance force exerted on him by the water.

    asked on February 18, 2010
  17. Algebra

    Line m passes through points (4, 9) and (2, 2). Line n passes through points (2, 2) and (6, 7). Are line m and line n parallel or perpendicular?

    asked on April 8, 2019
  18. physics

    A 25 kg chair initially at rest on a horizontal floor requires 393 N horizontal force to set it in motion. Once the chair is in motion, a 301 N horizontal force keeps it moving at a constant velocity. a) Find the coefficient of static friction between the

    asked on November 18, 2010
  19. Calculus

    A rocket fired straight in the air is being tracked by a radar station 3 miles from the launching pad. If the rocket is travelling at 2 miles per second, how fast is the distance between the rocket and the tracking station changing at the moment when the

    asked on April 9, 2014
  20. Analytic Geometry

    what is the radius of the circle circumscribing an isosceles right triangle having an area of 162 sq. cm? Show your solutions pls. Thank you!

    asked on June 29, 2016
  21. trig

    the height of a projectile is modeled by the equation y=-2x^2+38x+10, where x is a time, in seconds, and y is height, in feet, During what interval of time, to the nearest tenth of a second, is the projectile at least 125 feet above ground

    asked on December 10, 2010
  22. math

    An executive traveling at 60 km hr would arrive 10 minutes early for an appointment, whereas at a speed of 45 km hr the executive would arrive 5 minutes much time is there until the appointment?

    asked on March 23, 2016
  23. Algebra

    Is H=-4.9t²+vt+s the formula for a projectile motion, where h is height in meters t time in seconds and v velocity in meters per second and s start height in meters

    asked on June 13, 2017
  24. Chemistry

    An 80.0 g sample of a gas was heated from 25 degree C to 225 degree C. During this process, 346 J of work was done by the system and its internal energy increased by 7495 J. What is the specific heat of the gas? J/(g∗C)

    asked on October 22, 2013
  25. college physics

    A cube of ice is taken from the freezer at -9.5 degree Celsius and placed in a 99 g aluminum calorimeter filled with 327 g of water at room temperature of 20.0 degree celsius. The final situation is observed to be all water at 17.0 degree Celsius. What was

    asked on January 18, 2011
  26. chemistry

    How many mL of a 0.90% (m/v) NaCl stock solution will you need to to prepare 250 mL of a 0.225% m/v NaCl solution?

    asked on December 5, 2010
  27. Physics

    A 1-kg ball initially moving with a speed of 3m/s strikes a stationary 2kg ball head-on. After the collision both balls stick together. What are the final velocities of the two balls?

    asked on April 6, 2015
  28. Calculus

    List the critical numbers of the following function in increasing order. Enter N in any blank that you don't need to use. f(x) = (6x+6)/(5x^2+5x+5)

    asked on October 28, 2013
  29. algebra

    The light intensity of a light bulb varies inversely as the square of the distance from the light bulb. The function I(d) =   k/d^2 models this situation, where I is the light intensity, d is the distance from a light source, and k is a constant. If

    asked on February 5, 2018
  30. physics

    You are planning to build a log cabin in northern Minnesota. You will pull the logs up a long, smooth hill to the building site by means of a rope attached to a winch. You need to buy a rope for this purpose, so you need to know how strong the rope must

    asked on September 27, 2012
  31. Math

    The MPG for a certain compact car is normally distributed with a mean of 31 and a standard deviation of 0.8. what is the probability that the MPG for a randomly selected compact car would be less than 32?

    asked on March 25, 2009
  32. algebra

    The force, F, needed to break a board in a martial arts class varies inversely with the length, L, of the board. If it takes 24 pounds of pressure to break a board 2.5 feet long, how many pounds of pressure would it take to break a board that is 18 inches

    asked on February 5, 2018
  33. math

    A reading list contains 3 historical books and 4 science-fiction books. What is the probability that Tena will randomly choose a historical book for her first report and a science-fiction book for her second?

    asked on July 2, 2015
  34. probability

    choose a number 1 to 100. What is the probability that the number is not a multiple of 5?

    asked on March 8, 2013
  35. Math

    A model of A car has a scale of 3 cm : 2m the length of the actual hood of the car is 1m what is the length of the hood of the model

    asked on September 11, 2016
  36. Physics

    A small object of mass 3.00 g and charge -13 µC "floats" in a uniform electric field. What is the magnitude and direction of the electric field?

    asked on October 4, 2010
  37. Social Studies

    Witch country brought basball to the central american countries? Who brought slaves to the central american countries? Witch Country brought The religan Roman Cathlic to the central american countries? witch country brought ecomic aid to the central

    asked on January 30, 2007
  38. algebra

    A model rocket is launched upward with an initial velocity of 200 feet per second. The height, in feet, of the rocket t seconds after the launch is given by h = −16t2 + 200t. How many seconds after the launch will the rocket be 380 feet above the ground?

    asked on September 14, 2014
  39. physics

    You are part of a team to help design the atrium of a new building. Your boss, the manager of the project, wants to suspend a 16.0 kg sculpture high over the room by hanging it from the ceiling using thin, clear fishing line (string) so that it will be

    asked on September 27, 2012
  40. Physice

    I got all but this problem, I A 0.145-kg baseball is pitched at 42.0 m/s. The batter hits it horizontally to the pitcher at 58 m/s. A. Find change in momentum? Is it =.145*58-(-.145*42)=1.45-kg m/s? B. If bat and ball are in contact for 4.6 x 10-4 s, what

    asked on February 14, 2010
  41. Physical Chemistry

    A mole of air (80% Nitrogen, and 20% Oxygen by volume) at 298.15K is brought into contact with liquid water which has a vapor pressure of 3168Pa at this temperature. a) what is the volume of the dry air if the pressure is 1 bar? b) what is the final volume

    asked on February 6, 2012
  42. algebra

    Assume that y varies inversely as x. If y is 2.4 when x = 5, which is an equation that relates x and y?

    asked on February 5, 2018
  43. Chemistry

    How many grams of phosgenite can be obtained from 14.0 g of PbO and 14.0 g of NaCl in the presence of excess water and carbon dioxide?

    asked on November 4, 2013
  44. physics

    Tarzan, who weighs 820 N, swings from a cliff at the end of a 20.0 m vine that hangs from a high tree limb and initially makes an angle of 22.0° with the vertical. Assume that an x axis extends horizontally away from the cliff edge and a y axis extends

    asked on February 21, 2010
  45. Physics

    A horizontal force of 150 N is used to push a 33.0 kg packing crate a distance of 6.65 m on a rough horizontal surface. If the crate moves at constant speed and the work done is 997.5 joules. What is the coefficient of kinetic between the crate and the

    asked on February 18, 2010
  46. algebra

    The time it takes to finish a job varies inversely as the number of workers helping with the job. If 8 workers require 12 hours to finish a job, how much time would 18 workers require to finish the same job?

    asked on February 5, 2018
  47. Math

    You arrive home to find that your 45 foot by 20 foot basement has 3 inches of water in it. A) If 1 cubic foot of water is about 7.48 gallons, how much water will you be pumping out of your basement? Express your answer rounded to the nearest tenth of a

    asked on October 4, 2016
  48. Calculus

    Find the absolute maximum and absolute minimum values of the function f(x)=x^3+6x^2-63x+4 on each of the indicated variables. Enter DNE for does not exist. (A) Interval = [-8,0] Absolute maximum = Absolute minimum = (B) Interval = [-5,4] Absolute maximum =

    asked on October 29, 2013
  49. Chemistry

    In a constant-pressure calorimeter, 65.0 mL of 0.330 M Ba(OH)2 was added to 65.0 mL of 0.660 M HCl. The reaction caused the temperature of the solution to rise from 23.85 °C to 28.35 °C. If the solution has the same density and specific heat as water,

    asked on October 22, 2013
  50. history

    how did the aztecs become so powerful

    asked on January 24, 2019
  51. algebra

    According to Boyle’s law, the volume V of a gas varies inversely to the pressure P exerted by the gas. The volume of a given gas under a pressure of 32 kg per cm2 is 200 cm3. What will be the volume of this gas when the pressure exerted is 40 kg per cm2?

    asked on February 5, 2018
  52. Physics

    A uniform disk of radius 0.45 m is mounted on a frictionless, horizontal axis. A light cord wrapped around the disk supports a 1 kg object, as shown. When released from rest the object falls with a downward acceleration of 4.5 m/s^2. What is the moment of

    asked on February 16, 2016
  53. Physics

    A car of mass m = 1450 kg is traveling at a speed of v0 = 79 km/h (21.9 m/s). Calculate the work that must be done by the brakes to completely stop the car in kJ

    asked on May 27, 2012
  54. Math

    The denominator of a fraction exceeds the numerator by 7. If 3 is added to the numerator and 1 is subtracted from the denominator, the resulting fraction is equal to 4/5 . Find the original fraction. PLZ SHOW ALL WORK AND HURRY!!!

    asked on April 27, 2017
  55. Physics

    You push your couch a distance of 3.6 m across the living room floor with a horizontal force of 198.0 N. The force of friction is 151.0 N. What is the work done by you, by the friction force, by gravity, and by the net force?

    asked on May 27, 2012
  56. calculus

    The force F (in Newtons) required to move a box of mass m kg in motion by pulling on an attached rope is F(x) = f m g/(cos(x))+ f (sin(x)) where x is the angle between the rope and the horizontal, f is the coefficient of static friction and g = 9.8 m/s^2.

    asked on November 14, 2011
  57. algebra

    The height in feet of a projectile with an initial velocity of 32 feet per second and an initial height of 240 feet is a function of time in seconds given by h(t) = −16t^2 + 32t + 240. (a) Find the maximum height of the projectile. ______ ft (b) Find the

    asked on November 4, 2014
  58. chemistry

    what is the density of an object with a mass of 125g and a volume of 176ml?

    asked on September 17, 2013
  59. physics

    Barry Bee is flying through the air when he is struck by a truck. Which encounters more force, him or the truck?

    asked on February 24, 2010
  60. Grade 12 Data Management

    Two cards are drawn without replacement from a deck of 52 cards. a. What is the probability of drawning 2 aces? b. What are the odds in favour of drawing 2 honour cards? (A, K, Q, J, 10)

    asked on December 2, 2009
  61. Physics

    A communications satellite is moving at a constant speed in a circular orbit around Earth. At any given instant in time, what is the resultant force on the satellite? A. zero B. equal to the gravitational force on the satellite C. equal to the vector sum

    asked on May 3, 2018
  62. Calculus

    Answer the following questions for the function f(x)=(x^3-9x^2+27x-27)/(x^2-6x+8) defined on the interval [-14, 22]. Enter points, such as inflection points in ascending order. A. The function f(x) has vertical asymptotes at _______ and ________. B. f(x)

    asked on November 5, 2013
  63. Calculus

    The linear approximation to (1/sqrt(9-x)) at x=0. What is y?

    asked on October 10, 2013
  64. chemistry

    what is the density of an object with a mass of 125g and a volume of 176ml?

    asked on September 17, 2013
  65. phsyics

    To move a large crate across a rough floor, you push on it with a force F at an angle of 21¨¬ below the horizontal. The mass of the crate is 31 kg, ¥ìs is 0.57, and ¥ìk is 0.45. Find the force necessary to start the crate moving

    asked on September 19, 2012
  66. Biomaterials

    What is the theoretical density of tantalum (Ta) with the following characteristics: Crystal structure:     BCC Atomic radius:         14.6 Angstroms Atomic weight:        180.9 g/mol density needs to be in g/cm^3

    asked on May 22, 2012
  67. physics

    An outfielder throws a baseball with an initial speed of 30 m/s at an angle of 13° to the horizontal. The ball leaves his hand from a height of 1.75 m. How long is the ball in the air before it hits the ground?

    asked on May 21, 2012
  68. chemistry

    How many grams of magnesium metal are produced by the decomposition of 19 grams of magnesium chloride?

    asked on February 6, 2012
  69. Chemistry

    Alkali metals are so reactive that they react directly with water in the absence of acid. For Example... 2 K(s) + 2 H2O(l) ¨ 2 K+(aq) + 2 OH− (aq) + H2(g). How many milliliters of hydrogen will be evolved over water when 4.52 g K reacts with an excess

    asked on October 12, 2011
  70. 11th grade Math

    Two cars travel the same distance. The first car travels at a rate of 37 mph and reaches its destination in t hours. The second car travels at a rate of 54 mph and reaches its destination in 3 hours earlier than the first car. How long does it take for the

    asked on November 3, 2010
  71. physics

    A rocket is fired straight up through the atmosphere from the South Pole, burning out at an altitude of 208 km when traveling at 5.8 km/s. (a) What maximum distance from Earth's surface does it travel before falling back to Earth? I know how to do the

    asked on March 29, 2010
  72. Math

    A man 6 feet tall is standing 4 feet away from a 20 foot lamppost. How long is the lampposts shadow?

    asked on April 27, 2016
  73. algebra

    A veterinarian uses 300 feet of chain-link fencing to enclose a rectangular region and also to subdivide the region into two smaller rectangular regions by placing a fence parallel to one of the sides, (a) Write the width w as a function of the length l. w

    asked on November 4, 2014
  74. Calculus

    The radius of a circular disk is given as 24 cm with a maximal error in measurement of .2 cm. What is the percentage error?

    asked on October 10, 2013
  75. Physics

    in a childrens soccer game, one of the children kicks the ball from the ground, giving it an itial velocity of 22m/s a) what height and range does the ball reach? b) How high is the ball 2.25s into flight?

    asked on March 24, 2013
  76. math

    How do I figure the degree of measure from 18-24 people = 11%

    asked on February 15, 2012
  77. Math - Nash equilibrium

    Part 1 Consider a variant of electoral competition on the line that captures features of the US presidential election. Voters are divided between two states. State 1 has more electoral college votes than does state 2. The winner is the candidate who

    asked on February 28, 2011
  78. Info. Tech (Computer Science)

    1.)(a) CPU 1 has speed of 2.6 GH (steps per second) and runs a program which needs 10.9 T steps. (b) CPU 2 has speed of 2.2 GH and runs program which needs 7.3 T steps. ---How long does it take for CPU 1 and CPU 2 to finish the work? (Show all work!)

    asked on November 17, 2010
  79. physics

    Two particles are in a uniform electric field whose value is +4000 N/C. The mass and charge of particle 1 are m1 = 1.0x10-5 kg and q1 = -15 µC, while the corresponding values for particle 2 are m2 = 3.0 x10-5 kg and q2 = +35.0 µC. Initially the particles

    asked on October 4, 2010
  80. physics

    A 6.6 nC charge is located 2 m from a 4 nC charge. Find the magnitude of the electrostatic force that one charge exerts on the other.

    asked on September 30, 2010
  81. physics

    A 755 N man stands in the middle of a frozen pond of radius 9.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1.2 kg physics textbook horizontally toward the

    asked on March 1, 2010
  82. Math

    which fraction is the greatest 1/2 2/6 3/4 3/8

    asked on February 17, 2010
  83. Chemistry

    A gas initially at 20C must be changed to ? C to triple the pressure.

    asked on January 31, 2008
  84. Physics

    A block is released from rest at the top of an incline which makes a 30 degree angle with the horizontal. The incline is 12m long and it takes the block 25 seconds to reach the bottom. What is the coefficient of kinetic friction, µk, between the block and

    asked on February 25, 2015
  85. Business English

    Identify and correct the errors in the following to create parallel structure: To narrow a web search a. Put quotation marks around a phrase when you want an exact term. b. Many search engines have wild cards (usually an asterisk) to find plurals and other

    asked on January 18, 2015
  86. algebra

    A piece of pottery is removed from a kiln and allowed to cool in a controlled environment. The temperature (in degrees Fahrenheit) of the pottery after it is removed from the kiln is shown for various times (in minutes) in the following table. Time(min)

    asked on October 23, 2014
  87. physics

    The engine of a 1250 kg car provides a forward directed force of 3,560 N. If the car accelerates at a rate of 2.60 m/s2, what is the total resistive force (wind resistance, friction, etc.) acting on the car?

    asked on September 13, 2012
  88. Living ENvironment

    can you give me a picture lock and key diagrams. I need to make my own lock and key diagram. I don't know the difference between synthesis and hydrolosis so can you give me some pictures and label them if they are hydrolosis or synthesis.

    asked on February 16, 2012
  89. Trig

    A Person is riding a bike with wheels that have a 14 inch radius at 15 mph. The bicyclist rides over some gum which sticks in the tire, assume this is t=0. 1. Find a function that gives the height in inches above the ground of the gum, with input is second

    asked on March 30, 2011
  90. physics

    A Carnot engine operates between 170°C and 20°C. How much ice can the engine melt from its exhaust after it has done 6.0 104 J of work? i need a step by step process. you don't have to give me the answer.

    asked on September 29, 2010
  91. physics

    A tennis player standing 11.5 m from the net hits the ball at 2.60° above the horizontal. To clear the net, the ball must rise at least 0.252 m. If the ball just clears the net at the apex of its trajectory, how fast was the ball moving when it left the

    asked on September 19, 2010
  92. Social studies word unscramble

    I Have Two Diferent Words I need to unscramble DEIMEATT And NENLETHMEGIN

    asked on September 22, 2009
  93. Math

    Divide. Round to the nearest tenth. 17/6 How do you divide 17 into 6??

    asked on November 12, 2008
  94. algebra

    A pump can be adjusted to empty a 1000-liter pool at different rates. When operated at a rate of R liters per minute, the pump takes T minutes to empty the pool. Which equation below relates R and T correctly?

    asked on February 6, 2018
  95. Math

    The length of a rectangle is 2ft less than tree times width the area is 60 square ft. Find the length of the rectangle.

    asked on August 16, 2017
  96. Math

    Consider an account with an APR of 8.5%. Find the APY with daily compounding.

    asked on August 30, 2016
  97. Chemistry

    The chemistry problem is "How would you make 500.0 mL of a 3.00 M HCl solution form a stock solution that is 6.00 M?" I have no clue how to even approach this problem.

    asked on April 12, 2016
  98. Chemistry

    1). Calculate the initial and final pH when 5.0, 10.0, and 100mL of 0.100M HCL is added to (a) 100mL of water (b) 100mL of a buffer which is 1.50M acetic acid and 1.20M sodium acetate 2). Develop a recipe for making this buffer from acetic acid, sodium

    asked on March 6, 2016
  99. physics

    A stone is thrown straight up from the ground with an initial speed of 26.6 m/s. At the same instant, a stone is dropped from a height of "h" (a variable) meters above ground level. The two stones strike the ground simultaneously. Find the height "h" (a

    asked on August 23, 2015
  100. health

    Its important to choose foods that provide more A.carbohydrates B.potassium C.mercury D.cholesterol

    asked on April 11, 2015


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