College Physics (10th Edition)
10th Edition
ISBN: 9780321902788
Author: Hugh D. Young, Philip W. Adams, Raymond Joseph Chastain
Publisher: PEARSON
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Chapter 4, Problem 49GP
|| Jumping to the ground. A 75.0 kg man steps off a platform 3.10 m above the ground. He keeps his legs straight as he falls, but at the moment his feet touch the ground his knees begin to bend, and, treated as a particle, he moves an additional 0.60 m before coming to rest. (a) What is his speed at the instant his feet touch the ground? (b) Treating him as a particle, what are the magnitude and direction of his acceleration as he slows down if the acceleration is constant? (c) Draw a free-body diagram of this man as he is slowing down. (d) Use Newton's laws and the results of part (b) to calculate the force the ground exerts on him while he is slowing down. Express this force in newtons and also as a multiple of the man's weight. (e) What are the magnitude and direction of the reaction force to the force you found in part (c)?
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Chapter 4 Solutions
College Physics (10th Edition)
Ch. 4 - When a car accelerates starting from rest, where...Ch. 4 - If you step hard on the accelerator of your car....Ch. 4 - A passenger in a bus notices that a ball which has...Ch. 4 - It you hit the sidewalk with a hammer, the hammer...Ch. 4 - In a head-on collision between a compact hybrid...Ch. 4 - It would be much easier to lift a bowling ball on...Ch. 4 - A box of mass m1 is stacked on top of a second box...Ch. 4 - If your hands are wet and no towel is handy, you...Ch. 4 - It is possible to play catch with a softball in an...Ch. 4 - Newtons third law tells us that if you push a box...
Ch. 4 - If you drop a 10 lb rock and a 10 lb pillow from...Ch. 4 - Which feels a greater pull due to gravity, a heavy...Ch. 4 - When youre driving on the freeway its necessary to...Ch. 4 - The accelerations due to gravity near the surfaces...Ch. 4 - A golfer tees off and hits the ball with a mighty...Ch. 4 - Three books are at rest on a horizontal table, as...Ch. 4 - A rocket firing its engine and accelerating in...Ch. 4 - A person pushes horizontally with constant force P...Ch. 4 - Suppose the sun. including its gravity, suddenly...Ch. 4 - Three weights hang by very light wires as shown in...Ch. 4 - A woman normally weighs 125 lb. If she is standing...Ch. 4 - A worker pushes horizontally on a 2000 N...Ch. 4 - Far from any gravity, an astronaut accidentally...Ch. 4 - A worker pulls horizontally on a crate on a rough...Ch. 4 - A person pushes two Poxes with a horizontal 100 N...Ch. 4 - | A warehouse worker pushes a crate along the...Ch. 4 - | Two dogs pull horizontally on ropes attached to...Ch. 4 - | A man is dragging a trunk up the loading ramp of...Ch. 4 - | BIO Jaw injury. Due to a jaw injury, a patient...Ch. 4 - | Workmen are trying to free an SUV stuck in the...Ch. 4 - A box rests. on a frozen pond, which serves as a...Ch. 4 - | In outer space, a constant force is applied to a...Ch. 4 - || A 68.5 kg skater Moving initially at 2.40 m/s...Ch. 4 - BIO Animal dynamics. An adult 68 kg cheetah can...Ch. 4 - || A 2 kg block sits at rest on a frictionless...Ch. 4 - A dock worker applies a constant horizontal force...Ch. 4 - | (a) What is the mass of a book that weighs 320 N...Ch. 4 - Superman throws a 2400 N boulder at an adversary....Ch. 4 - | BIO (a) How many newtons does a 150 lb person...Ch. 4 - | BIO(a) An ordinary flea has a mass of 210 g. How...Ch. 4 - | BIO Calculate the mass (in SI units) of (a) a...Ch. 4 - || A standard bathroom scale is placed on an...Ch. 4 - || At the surface of Jupiters moon lo, the...Ch. 4 - || A scientific instrument that weighs 85.2 N on...Ch. 4 - || Planet X! When venturing forth on Planet X, you...Ch. 4 - | You drag a heavy box along a rough horizontal...Ch. 4 - || A person pushes two boxes with a horizontal...Ch. 4 - | The upward normal force exerted by the floor is...Ch. 4 - | A person throws a 2.5 lb stone into the air with...Ch. 4 - | A tennis ball traveling horizontally at 22 m/s...Ch. 4 - || Two crates, A and S, sit at rest side by side...Ch. 4 - || A ball is hanging from a long string that is...Ch. 4 - | A person drags her 65 N suitcase along the rough...Ch. 4 - || A factory worker pushes horizontally on a 250 N...Ch. 4 - || A dock worker pulls two boxes connected by a...Ch. 4 - || A hospital order y pushes horizontally on two...Ch. 4 - | A uniform 25.0 kg chain 2.00 m long supports a...Ch. 4 - | A 60 kg circus performer is climbing up a rope...Ch. 4 - | A 275 N bucket is lifted with an acceleration of...Ch. 4 - || BIO Human biomechanics. World-class sprinters...Ch. 4 - || A chair of mass 12.0 kg is sitting on the...Ch. 4 - || BIO Human biomechanics. The fastest pitched...Ch. 4 - || You walk into an elevator, step onto a scale,...Ch. 4 - || A woman is standing in an elevator holding her...Ch. 4 - || An advertisement claims that a particular...Ch. 4 - || A rifle shoots a 4.20 g bullet out of its...Ch. 4 - || A parachutist relies on air resistance (mainly...Ch. 4 - As shown in Figure 4.40, force vector F1 always...Ch. 4 - || A spacecraft descends vertically near the...Ch. 4 - || BIO A standing vertical Jump, NFL player Gerald...Ch. 4 - || You leave the doctors office after your annual...Ch. 4 - || BIO Human biomechanics. The fastest served...Ch. 4 - || Extraterrestrial physics. You have landed on an...Ch. 4 - || Jumping to the ground. A 75.0 kg man steps off...Ch. 4 - BIO Forces on a dancers body. Dancers experience...Ch. 4 - BIO Forces on a dancers body. Dancers experience...Ch. 4 - BIO Forces on a dancers body. Dancers experience...Ch. 4 - BIO Forces on a dancers body. Dancers experience...
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