College Physics
3rd Edition
ISBN: 9780134201948
Author: Knight, Randall Dewey, Jones, Brian, Field, Stuart
Publisher: Pearson,
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Textbook Question
Chapter 4, Problem 53GP
Problems 49 through 61 describe a situation. For each problem, draw a motion diagram, a force identification diagram, and a free-body diagram.
53. A sprinter has just started a race and is speeding up as she runs down the track.
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A teenager of mass m1 = 68 kg pushes backward against the ground with his foot as he rides his skateboard. This exerts a horizontal force of magnitude Ffoot = 15 N. The skateboard has m2 = 2.6 kg.
a) Write an expression in terms of given quantities for the magnitude of the skateboard's acceleration, a, while the teenager is pushing backwards on the ground.
b) What is the numerical value for the magnitude of the acceleration, a, in m/s2?
A constant force applied to object A causes it to accelerate at 5 m/s2. The same force applied to object B causes an acceleration of 3 m/s2. Applied to object C, it causes an acceleration of 8 m/s2.a. Which object has the largest mass?b. Which object has the smallest mass?c. What is the ratio of mass A to mass B (mA/mB)?
Two crates, one with mass 4.00 kg and the other with 6.00 kg, sit on the frictionless surface of a frozen pond, connected by a light rope. A woman wearing golf shoes (so she can get traction on the ice) pulls horizontally on the 6.00-kg crate with a force F that gives the crate an acceleration of 2.50 m/s22.
(a) What is the acceleration of the 4.00- kg crate?
(b) Draw a free- body diagram for the 4.00-kg crate. Use that diagram and Newton's second law to find tension T in the rope that connects the two crates.
(c) Draw a free-body diagram for 6.00- kg crate. What is the direction of the net force on the 6.00-kg crate? Which is larger in magnitude, force T, or force F?
(d) Use part (c) and Newton's second law to calculate the magnitude of the force F.
Chapter 4 Solutions
College Physics
Ch. 4 - If an object is not moving, does that mean that...Ch. 4 - An object moves in a straight line at a constant...Ch. 4 - If you know all of the forces acting on a moving...Ch. 4 - Three arrows are shot horizontally. They have left...Ch. 4 - A carpenter wishes to tighten the heavy head of...Ch. 4 - Internal injuries in vehicular acci-dents may be...Ch. 4 - Heres a great everyday use of the physics...Ch. 4 - Suppose you are an astronaut in deep space, far...Ch. 4 - Jonathan accelerates away from a stop sign. His...Ch. 4 - Normally, jet engines push air out the back of the...
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