Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
ISBN: 9781305116399
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Chapter 6, Problem 6.24P
Review. A student, along with her backpack on the floor next to her, is in an elevator that is accelerating upward with acceleration a. The student gives her backpack a quick kick at t = 0, imparting to it speed v and causing it to slide across the elevator floor. At time t, the backpack hits the opposite wall a distance L away from the student. Find the coefficient of kinetic friction μk between the backpack and the elevator floor.
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You are riding in an elevator on the way to the 18th floor of your dormitory. The elevator is accelerating upward with a = 1.90 m/s2. Beside you is the box containing your new computer; the box and its contents have a total mass of 36.0 kg. While the elevator is accelerating upward, you push horizontally on the box to slide it at constant speed toward the elevator door. If the coefficient of kinetic friction between the box and the elevator floor is mk = 0.32, what magnitude of force must you apply?
A person pushes a box of mass m= 25 kg in a straight line along a rough floor. The applied force F has
magnitude 85 N and acts downward at an angle 0 = 10° with respect to the horizontal, as shown below.
The box is initially at rest at the position x, = 0 m, and it has speed v2 = 0.55 m/s at position x2= 3.50 m.
a). Find the coefficient of friction between the box and the floor.
b). What is the net work done?
c). How much work (magnitude and sign) is done by the friction force?
(This problem involves constant acceleration, Newton's Laws, and work!)
m
2 crates are connected to each other by a rope. One crate(m=17kg) is sitting by the ledge of a cliff, and has a coefficient of friction between itself and the ground of 0.21. The second crate(m=11kg) is hanging off the edge of the cliff. Assuming that the hanging crate is heavy enough to pull the crate by the ledge to the right.
Find a) and b) and Draw FBD for each crate
a) The acceleration of the system
b) The tension force that connects 2 crates together
Chapter 6 Solutions
Physics for Scientists and Engineers, Technology Update (No access codes included)
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