1. Science

    A wagon was used to move a 90 lb rock 120yds. It took 40 sec and 70 lbs of force to do this. Find horsepower and efficiency

    asked by Heather on December 11, 2007
  2. Physics

    A wagon was used to move a 90 lb rock 120 yds. It took 40 sec and 70 lbs of force. Can someone help me solve for efficiency and horsepower????? PLEASE :)

    asked by Heather on December 11, 2007
  3. physics

    A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 94.0 kg. The mass of the rock is 0.350 kg. Initially the wagon is rolling forward at a

    asked by Sam on October 22, 2011
  4. physics

    A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 96.5 kg. The mass of the rock is 0.250 kg. Initially the wagon is rolling forward at a

    asked by Sarah on October 15, 2010
  5. College Physics

    A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 96.5 kg. The mass of the rock is 0.250 kg. Initially the wagon is rolling forward at a

    asked by Jordan on October 14, 2010
  6. Physics

    A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 97.0 kg. The mass of the rock is 0.320 kg. Initially the wagon is rolling forward at a

    asked by Sara on October 14, 2012
  7. Physics 141

    A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 93.0 kg. The mass of the rock is 0.320 kg. Initially the wagon is rolling forward at a

    asked by dakota22 on March 11, 2014
  8. physics

    A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 90 kg. The mass of the rock is 0.26 kg. Initially the wagon is rolling forward at a speed

    asked by alika on October 2, 2014
  9. physics

    A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 95 kg. The mass of the rock is 0.34 kg. Initially the wagon is rolling forward at a speed

    asked by Meagan on November 4, 2011
  10. Physics

    A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 94 kg. The mass of the rock is 0.27 kg. Initially the wagon is rolling forward at a speed

    asked by Dreama on October 8, 2013
  11. Physics

    A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 92.5 kg. The mass of the rock is 0.310 kg. Initially the wagon is rolling forward at a

    asked by Elizabeth on October 22, 2012
  12. physics

    A wagon is used to help deliver papers. There is a force applied at an angle of 25 degrees to the horizontal that causes the wagon to move a distance of 15m[N] in 10.0s from rest. There is a force of friction of 3.1 N acting on the 27kg wagon. What is the

    asked by Melissa on April 9, 2012
  13. Physics

    You pull on a wagon resting on the sidewalk. What will happen next? The wagon moves because you apply more force to the wagon than it applies to you. The wagon doesn’t move because the force you apply to the wagon is equal to the force it applies to you:

    asked by BlessedGalPal on October 8, 2018
  14. Physics

    A child sits in a wagon with a pile of 0.60 kg rocks. If she can throw each rock with a speed of 10 m/s relative to the ground, causing the wagon to move, how many rocks must she throw per minute to maintain a constant average speed against a 3.7 N force

    asked by Carden on April 29, 2010
  15. Physics

    A horse pulls upon a wagon, but according to Newton’s third law the wagon pulls back with an equal and opposite force upon the horse. How then can either the wagon or the horse move? I'm supposed to draw a free body diagram but I'm not sure on the

    asked by Alex on July 17, 2012
  16. PLEASE HELP

    with the following problem: A wagon was used to move a 90 lb rock 120 yds. It took 40 seconds and 70 lbs of force. Find Horsepower and Efficiency % THANKS.

    asked by Heather on December 11, 2007
  17. Math

    For this problem, a person standing on the edge of a cliff throws a rock directly upward. it is observed that 2 secs later the rock is at its maximum height (in feet) and that 5 secs after that (meaning 7 seconds after being thrown) the rock hits the

    asked by Leah on October 7, 2014
  18. Physics

    A wagon with a weight of 200.00 N is accelerated across a level surface at 0.8 m/sec squared. What net force acts on the wagon?

    asked by Brittany on October 26, 2009
  19. physics

    Consider a rock that is thrown off a bridge of height 27 m at an angle θ = 24° with respect to the horizontal as shown in the figure above. If the initial speed the rock is thrown is 12 m/s, find the following quantities: (a) The time it takes the rock

    asked by tommy on September 7, 2010
  20. Calculus Help Please Urgent!!!

    At time t=0, an astronaut stands on a platform 3 meters above the moon's surface and throws a rock directly upward with an initial velocity of 32 m/sec. if the acceleration due to gravity is 1.6 m/sec^2. a) find the equations of motion for the throwing of

    asked by Anonymous on April 24, 2014
  21. calculus help

    At time t=0, an astronaut stands on a platform 3 meters above the moon's surface and throws a rock directly upward with an initial velocity of 32 m/sec. if the acceleration due to gravity is 1.6 m/sec^2. a) find the equations of motion for the throwing of

    asked by Anonymous on April 25, 2014
  22. Calculus Help Please!!! Check

    If a rock is propelled upward from the surface of Mars at a velocity of 93 m/sec, it reaches a height s = 93t – 1.86t^2 after t sec. a. Find the rock’s velocity and acceleration at time t. v'(t)=93-3.72t a''(t)=-3.73 b. How long does it take the rock

    asked by Tenshi on April 8, 2014
  23. Calculus Help Please!!! Check

    If a rock is propelled upward from the surface of Mars at a velocity of 93 m/sec, it reaches a height s = 93t – 1.86t^2 after t sec. a. Find the rock’s velocity and acceleration at time t. v'(t)=93-3.72t a''(t)=-3.73 b. How long does it take the rock

    asked by Tenshi on April 8, 2014
  24. Physics

    A ball is sitting in a child's wagon and a child is holding the wagon's handle. The ball then rolls to the back of the wagon without anyone touching the ball directly. Which of the following statements according to Newton's first law of motion could

    asked by Sam on June 8, 2014
  25. Physics

    You are pulling handle of a wagon with a force of 270N. The handle makes an upward 35 degrees angle with the ground. The loaded wagon has a mass of 95kg. 1.what is the weight of the wagon? 2.How much of your applied force pulls the wagon forward? 3.what is

    asked by Anonymous on October 14, 2015
  26. Physics, Please Help

    A homeowner is trying to move a stubborn rock from his yard which has a mass of 1025 kg. By using a lever arm (a piece of wooden board) and a fulcrum (or pivot point) the homeowner will have a better chance of moving the rock. The homeowner places the

    asked by Mike on November 25, 2012
  27. Physics

    A 32 kg child puts a 15 kg box into a 12 kg wagon. The child then pulls horizontally on the wagon with a force of 65 N. if the box does not move relative to the wagon, what is the static friction force on the box?

    asked by T on January 16, 2012
  28. Physics

    A wagon is coasting at a speed vA along a straight and level road. When twenty-five percent of the wagon's mass is thrown off the wagon, parallel to the ground and in the forward direction, the wagon is brought to a halt. If the direction in which this

    asked by Anonymous on March 24, 2014
  29. Physics

    A wagon is coasting at a speed, vA, along a straight and level road. When ten percent of the wagon's mass is thrown off the wagon, parallel to the ground and in the forward direction, the wagon is brought to a halt. If the direction in which this mass is

    asked by Shauna on March 1, 2014
  30. physics

    A tractor pulls a loaded wagon with a constant force of 300 N. If the total mass of the wagon and its contents is 275 kg, (a) what is the wagon's acceleration? (b) Assuming the wagon started from rest, how far does the tractor travel in 4.00 s?

    asked by Anonymous on November 2, 2012
  31. 12th Grade Physics

    Ben pulls a rope that is attached to a wagon with a magnitude of 300N. He pulls it in a way that te rope is at an angle of 30 degrees from the horizontal. The mass of the wagon is 2kg and the mass of Mike, who sits on the wagon, is 20kg. While the wagon

    asked by Ana on August 28, 2014
  32. Physics

    A cart is coasting at a speed v A along a straight and level road. When ten percent of the wagon’s mass is thrown off the wagon, parallel to the ground, and in the forward direction, the wagon stops. However, if this same amount of mass is thrown out the

    asked by Chad on August 7, 2012
  33. Physics

    A child pushes a wagon with a passenger of total mass 42 kg along a horizontal surface as fast as the child can run, and then releases the wagon, which continues for another 16 m before stopping. The coefficient of kinetic friction acting to slow the wagon

    asked by Jatin on November 12, 2016
  34. Calculus

    A blast blows a rock straight up at 150 ft/sec. The path of the rock is described by the s(t) = 150t-16t^2 where s is measured in feet and t in seconds. Find the velocity of the rock when it is 200 ft above the ground and when the rock hits the ground.

    asked by Desperate!!!! on February 18, 2012
  35. physics

    A child pulls a wagon by the handle along a flat sidewalk. She exerts a force of 80.0 N at an angle of 30.0 above the horizontal while she moves the wagon 12 m forward. The force of friction on the wagon is 34 N. Calculate the mechanical work done by the

    asked by Rosie on October 28, 2014
  36. physics

    A 38.2 kg wagon is towed up a hill inclined at 19° with respect to the horizontal. The tow rope is parallel to the incline and exerts a force of 140 N on the wagon. Assume that the wagon starts from rest at the bottom of the hill, and disregard

    asked by Corey on December 5, 2010
  37. physics

    A 38.2 kg wagon is towed up a hill inclined at 19° with respect to the horizontal. The tow rope is parallel to the incline and exerts a force of 140 N on the wagon. Assume that the wagon starts from rest at the bottom of the hill, and disregard

    asked by Corey on December 5, 2010
  38. Science

    You Are Out In The Woods And You Need To Move A Boulder That Is In The Way, You Happen To Have A Long 2-by-4 Board With You And You Decide To Use It As A Lever. You Find A Rock To Act As A Fulcrum. Which Of The Following Would Be A Good Thing To Try? I

    asked by Jenny on March 4, 2009
  39. physics

    A 48-kg girl stands on a 8-kg wagon holding two 19.5-kg weights. She throws the weights horizontally off the back of the wagon at a speed of 9.0 m/s relative to herself. Assuming that the wagon was at rest initially, what is the speed with which the girl

    asked by sara on December 5, 2015
  40. physics

    A 35.2 kg wagon is towed up a hill inclined at 18.3◦ with respect to the horizontal. The tow rope is parallel to the incline and exerts a force of 125 N on the wagon. Assume that the wagon starts from rest at the bottom of the hill, and disregard

    asked by Anonymous on October 27, 2014
  41. physics

    A child pulls a wagon with a force of 16 N by a handle making an angle of 20 degrees with the horizontal. If the wagon has a mass of 4.9 kg, to the nearest hundredth of a m/s2 what is the acceleration of the wagon?

    asked by llama on July 21, 2016
  42. physics

    A child pulls a wagon with a force of 58 N by a handle making an angle of 27 degrees with the horizontal. If the wagon has a mass of 4.5 kg, to the nearest hundredth of a m/s2 what is the acceleration of the wagon

    asked by Anonymous on July 7, 2016
  43. math

    A child pulls a wagon with a force of 33 N by a handle making an angle of 11 degrees with the horizontal. If the wagon has a mass of 5.5 kg, to the nearest hundredth of a m/s2 what is the acceleration of the wagon?

    asked by billy on March 7, 2011
  44. samoana high school

    phoebe physics pulls a wagon with a force of 80 N. a) what is the net force of friction between the wagon and the ground is 12 N. b) if she uses 80 N to pull the wagon through a med puddle, and the net force on the wagon is 38 N, what friction force asts

    asked by davina on January 12, 2015
  45. physics

    A child pulls on a wagon handle at an angle 37° above the horizontal with a force of 45 N. If the wagon accelerates at 8.1 m/s2 horizontally, what is the mass of the wagon? Assume frictional forces are negligible.

    asked by anonymous on February 13, 2011
  46. Science

    I don't understand Newton's second law: Net Force = Mass x Acceleration I don't understand what this says. Does it mean that the higher the mass, the more force it takes to move it the same distance as a lighter mass or something? HEEELP! The equation,

    asked by charlottethetragedy (: on April 2, 2007
  47. Science

    a wagon that has a mass of 8kg? If the net force on a wagon is 4N, what is the wagon’s acceleration?

    asked by Ann on November 3, 2013
  48. HELP! - Physics

    I need help with this. A frustrated farmer is trying to move a large rock from his land. The stone has a mass of 1275 kg. By using a piece of board as a lever and a fulcrum the farmer will have a better chance of moving the rock. The farmer places the

    asked by Johnny on October 28, 2014
  49. physics

    One day I decide I want to see how high I can throw a rock. I throw a rock straight up in the air and it has a speed of 30 m/s when it leaves my hand. I then realize this was foolish, as I need to get out of the way before the rock comes back down and hits

    asked by HELP!! on May 17, 2013
  50. Physics

    Example 1: (Rock A) is thrown against a larger stationary rock(Rock B). considering the following possibilities... 1. Rock A bounces off of Rock B 2. Rock A splits into two pieces off of Rock B 3. Rock A explodes into many pieces off of Rock B What factors

    asked by Cole on November 8, 2013
  51. Physics

    Consider a ball at rest on the middle of a toy wagon. When a wagon is pulled forward, the ball rolls against the back of the wagon. Interpret this observation in terms of Newton's First Law of Motion. thanks ;)

    asked by neymar jr :-* on January 5, 2015
  52. Science

    Lever, You Find A Smaller Rock, Use As A Fulcrum, You Place It A Meter From Boulder. What Works? """I choose A"""" A)move the fulcrum rock closer to the boulder b)move the fulcrum rock farther from the boulder c) try using the board without a fulcrum d)

    asked by Jenny on March 4, 2009
  53. physics

    A small child has a wagon with a mass f 10 kilograms (KG). The child pulls on the wagon with a force of 2 newtons (N). What is the acceleration of the wagon?

    asked by Bri on December 4, 2012
  54. Physics

    Starting from rest Maria pulls horizontally on her new wagon for 1.1 seconds. She exerts a constant force of 89N against a frictional force of 43N. The wagon's final velocity is 3.2m/s. If she is on a level ground, how much does the wagon weigh?

    asked by help on January 26, 2010
  55. physics

    Buffy is rolling along in her 12.7 kg wagon at 3.6 m/s (in the positive direction) when she jumps off the back. She continues to move forward at 1.2 m/s relative to the ground. This causes her wagon to go speeding forward at 9.51 m/s relative to the

    asked by dean on February 9, 2014
  56. physics

    Buffy is rolling along in her 11.1 kg wagon at 4.6 m/s (in the positive direction) when she jumps off the back. She continues to move forward at 1.5 m/s relative to the ground. This causes her wagon to go speeding forward at 13.03 m/s relative to the

    asked by jim on February 9, 2014
  57. Integration

    Intergrate ¡ì sec^3(x) dx could anybody please check this answer. are the steps correct? thanks. = ¡ì sec x d tan x = sec x tan x - ¡ì tan x d sec x = sec x tan x - ¡ì sec x tan^2(x) dx = sec x tan x + ¡ì sec x dx - ¡ì sec^3(x) dx = sec x tan x

    asked by Vidal on October 15, 2006
  58. math

    on earth, in the absence of air, the rock in excersise 13 would reach a height of s=24t- 4.9t^2 meters in t seconds. How high would the rock go? (exercise 13:a rock thrown vertically upward from the surface of the moon at a velocity of 24m/sec reaches

    asked by sammi on October 12, 2009
  59. physics

    A worker has to move a rock with mass 50 kg on a stairway from the first floor to the second floor of a house. The second floor is 4.6 m above the first floor and the stairway has 18 steps. The rock is lifted from step to step. How much energy (in Joule)

    asked by diane on April 7, 2015
  60. physics

    A 48-kg girl stands on a 8-kg wagon holding two 19.5-kg weights. She throws the weights horizontally off the back of the wagon at a speed of 9.0 m/s relative to herself. - Assuming that the wagon was at rest initially, what is the speed of the girl after

    asked by maria on December 5, 2015
  61. physics

    A wagon is pulled by a handle making an upward angle of 25° with a force of 25 N. What is the horizontal force pulling the wagon foward? What is the force lifting the wagon off the road?

    asked by Alyssa on November 3, 2012
  62. physics

    A wagon is pulled by a handle making an upward angle of 25° with a force of 25 N. What is the horizontal force pulling the wagon foward? What is the force lifting the wagon off the road?

    asked by Alyssa on October 31, 2012
  63. DES

    A rock is being pushed by a stream with 30 N of force. The rock has a static friction of 40 N and a sliding friction of 20 N. Does the rock move?

    asked by Judie on March 18, 2013
  64. physics

    A 40.0 kg wagon is towed up a hill inclined at 17.9° with respect to the horizontal. The tow rope is parallel to the incline and has a tension of 140 N. Assume that the wagon starts from rest at the bottom of the hill, and neglect friction. How fast is

    asked by luc on October 10, 2009
  65. physic

    A 1.2-kilogram basketball travelling at 7.5 meters per second hits the back of a 12-kilogram wagon and bounces off a 3.8 meters per second, sending wagon off in the original direction of travel of the ball. How fast is the wagon going?

    asked by Anonymous on August 31, 2015
  66. Math

    Free fall equation is s=6.1t^2 ft, where t is in seconds. Assume a rock is dropped from a 100 ft cliff. Find speed of the rock at t=3.5 sec.

    asked by Beth on December 13, 2015
  67. Earth Science

    1. In the classroom during a visual inspection of a rock, a student recorded four statements about the rock. Which statement about the rock is an observation? (1)The rock formed deep in Earth’s interior. (2)The rock cooled very rapidly. (3)The rock

    asked by Anonymous on June 18, 2008
  68. math

    how far will a rock fall in 15 sec if it is dropped 150 feet above the river at an initial speed of 24 ft per sec

    asked by carol on December 17, 2012
  69. college physics

    if a girl pulls on a 15 kg wagon with a constant horizontal force of 35N.Her friend pushes on the wagon in the same direction with a constant horizontal force of 10 N. and there is a friction force of 15 N. I need to draw a diagram of this problem and

    asked by patti on March 18, 2013
  70. physics

    A boy pulls a wagon with a force of 20N on a handle of .50 meters long. The end he holds is .25 meters higher than the end attached to the wagon. What is the magnitude of the horizontal component that acts to pull the wagon forward?

    asked by Kim on September 13, 2011
  71. mechanics

    An empty railway wagon of mass 4500kg travelling at 15m/s collides with a stationary loaded wagon of mass 2400kg. The empty wagon bounces backwards at 4m/s. a) Find the velocity of the loaded wagon after the collision (answer was 3.49m/s) b) Find the

    asked by kelly on June 23, 2010
  72. Physics

    A 40.7kg wagon is towed up a hill inclined at 18.1 degrees with respect to the horizontal. The tow rope is parallel to the incline and has a tension of 139N in it. Assume that the wagon starts from rest at the bottom of the hill, and neglect friction. The

    asked by Ethan on February 15, 2012
  73. physics

    A large rock is dropped from a plane flying horizontally at an altitude of 4.00 x 10 ^3 ( to the power of 3) and with a speed of 900km h. a) calculate the distance that the rock will move horizontally before hitting the ground b) find the velocity of the

    asked by sabine on June 11, 2013
  74. Hs Math

    on the moon, the acceleration due to gravity is 1.6m/sec^2 a. if a rock is dropped into a crevasse, how fast will it be going just before it hits bottom 30sec later? b. how far below the point of release is the bottom of the crevasse? c. if instead of

    asked by ET on November 6, 2008
  75. English help

    "The wagon turned and crawled out the entrance" is an example of personification. What is the impact of using this method? A. It implies that the fixer does not want to leave. B. It shows that the fixer is very fond of his wagon. C. It helps the reader

    asked by Cassie on January 31, 2014
  76. physics

    a girl pulls a wagon along a level path for a distance of 15.0 m. the handle of the wagon makes an angle of 20.0 degrees with the horizontal, the girl exerts a force of 35.0 N on the handle. Friction provides a force of 24.0 N. Find the net work done on

    asked by lalaglaze on October 19, 2009
  77. physics

    a child causes a wagon to accelerate by pulling it with a horizontal force. newton's third law says that the wagon exerts an equal and opposite force on the child. how can the wagon accelerate? (hint: draw a free-body diagram for each object.)

    asked by billy on November 2, 2009
  78. physics

    A wagon with a width of 2.4 m, moving at a speed of 15 m per second, was shot through by a bullet perpendicular to the movement of the wagon. The distance between the two bullet holes in the wagon’s walls is 6 cm. What is the speed of the bullet?

    asked by Mia on August 17, 2011
  79. science

    A wagon 8kg travelling due east with a velocity of 10m/s collides with a second wagon of mass 12kg travelling due west at 2m/s. After collision the wagon moves off at 3m/s due east. Determine the magnitude and direction of the velocity of the 12kg wagon

    asked by Lucky chembe on April 16, 2016
  80. physics

    A boy pulls his little brother in a little red wagon. He keeps the handle horizontal to the ground. His little brother and the wagon weigh 40 kg. How much tension will the boy have to place on the wagon's handle to get it moving from a standstill?

    asked by Jordan on December 6, 2010
  81. Math

    A rock is thrown upward with a velocity of 12 meters per sec from the top of a 25 meter high cliff and it misses on it's way back down. When will the rock be 3 meters from water

    asked by Kelly on September 1, 2015
  82. Physics

    a child causes a wagon to accelerate by pulling it with a horizontal force. newton's third law says that the wagon exerts an equal and opposite force on the child. how can the wagon accelerate

    asked by Betsy on November 22, 2008
  83. Calculus

    A rock is thrown upward off a bridge. In 2sec. the rock passes you on the way down. In 3 more sec. it hits the water. How high is the bridge above the water and how high did the rock go above the bridge? Can someone help me start his problem!?

    asked by Justyna on March 19, 2008
  84. science

    A wagon with a weight of 300N is accelerated across a level surface at 0.5 m/s . What net force acts on the wagon

    asked by BJ on December 5, 2010
  85. physics

    a net force of 200 newton's is applied to a wagon for 3 seconds. this causes the wagon to undergo a change in momentum of

    asked by john on December 1, 2014
  86. physics

    a net force of 100 newton's is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of

    asked by john on December 1, 2014
  87. earth

    #40 which type of rock is a result of a rock changing by heat and pressure? a. metamorphic rock b. igneous rock c. sedimentary rock d. metal ores

    asked by ? on January 13, 2013
  88. vacunero sto. domingo

    a 50 kg wagon is at rest on a rough surface.The coefficient of sliding friction is 0.85.How much force is needed to start moving the wagon.

    asked by maria on July 2, 2015
  89. Physics 11th grade 2

    1) A 20 kg rock is on the edge of a 100 m cliff. a. What potential energy does the rock possess relative to the base of the cliff? b. The rock falls from the cliff. What is the kinetic energy just before it strikes the ground? c. What speed does the rock

    asked by Isis on March 11, 2013
  90. Gweedo8

    a man stand on a 100 m cliff and throws a rock with speed of 40ms at 42degrees above horizontal. what time before rock hits ground. the horizontal distance the rock traveled from base of cliff.? my answer is 4.08 sec before rock hits ground 81.6 m distance

    asked by Physics on January 29, 2010
  91. Calculus

    Given f '(x) = (x − 4)(4 − 2x), find the x-coordinate for the relative maximum on the graph of f(x). a) 12 m/sec; 22 m/sec^2 b) 22 m/sec; 18 m/sec^2 c) 22 m/sec; 6 m/sec^2 d) 14 m/sec; 3 m/sec^2

    asked by Alice on February 1, 2019
  92. Earth Science

    1.Which statement made by a student after examining a rock specimen is an inference? (1)The rock is of igneous origin. (2)The rock has rounded edges. (3)The rock is light-colored. (4)The rock contains large crystals. Is it (1)?

    asked by Anonymous on June 18, 2008
  93. PHYSICS

    A ROCK IS THROWN OFF A CLIFF WITH AN HORIZONTAL VELOCITY OF 55.0 M/SEC. IT TAKES THE ROCK 7.0 SEC TO HIT THE GROUND A)WHAT IS THE HEIGHT OF THE CLIFF B) HOW FAR FROM THE FOOT OF THE CLIFF DOES THE ROCK HIT THE GROUND C)WHAT IS THE HORIZONTAL COMPONENT OF

    asked by HELPPPPPPP on October 16, 2011
  94. physics

    a rock is thrown of a cliff with an horizontal velocity of 55.0 m/sec. it takes the rock 7.0 sec to hit the ground a) what is the height of the cliff. b)how far from the foot of the cliff does the rock hit the ground. c) what is the vertical component of

    asked by ru on October 15, 2011
  95. physics

    How much work is done by the boy pulling his sister d = 25.0 m in a wagon as shown in figure below? Assume no friction acts on the wagon and he pulls with a force of 65.0 N and at an angle θ = 31.0°.

    asked by stephanie on November 14, 2017
  96. physics

    A 44-kg girl stands on a 7-kg wagon holding two 15.0-kg weights. She throws the weights horizontally off the back of the wagon at a speed of 9.5 m/s relative to herself. Assuming that the wagon was at rest initially, what is the speed of the girl after she

    asked by anonymus on August 30, 2018
  97. calculus

    a toy wagon is pulled by exerting a force of 15 pounds on a handle that makes a 30 degree angle with the horizontal. find the work done in pulling the wagon 50 feet.

    asked by Nancy on May 12, 2010
  98. Integral calculus

    A particle is put inside an accelerator at time t=0. After t sec, its velocity is 10^5t^2 m/s. How far does the particle move during the first 10**-2 sec? distance= int velocity dt = INT 1E5 t^2 dt limits 0 to 1E-2 sec

    asked by Febby on April 13, 2007
  99. Science: Drifting Continents

    Sandstone is a sedimentary rock. Which of the following characteristics would you look for in a piece of sandstone? A) Rock has sparkly or alternating color layers that are bent or folded B) Rock has layers and smaller pieces of rock in it. It also has

    asked by TikiKiwi on February 5, 2016
  100. Physics

    A 200kg wagon is pushed along a horizontal surface at a constant 10m/s when it is released. After rolling a distance of 45m the wagon comes to a complete stop. Find the coefficient of friction.

    asked by Emma on December 4, 2016