University Physics (14th Edition)
14th Edition
ISBN: 9780133969290
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Question
Chapter 6, Problem 6.45E
(a)
To determine
The sled’s speed when it returns to its uncompressed length.
(b)
To determine
The speed of the sled when spring is compressed.
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At a waterpark, sleds with riders are sent along a slippery, horizontalsurface by the release of a large compressed spring. The spring,with force constant k = 40.0 N/cm and negligible mass, rests on thefrictionless horizontal surface. One end is in contact with a stationarywall. A sled and rider with total mass 70.0 kg are pushed against theother end, compressing the spring 0.375 m. The sled is then releasedwith zero initial velocity. What is the sled’s speed when the spring(a) returns to its uncompressed length and (b) is still compressed 0.200 m?
63. A 10.0-kg block is released from rest at point in Fig-
Mure P8.63. The track is frictionless except for the por-
tion between points and ©, which has a length of
6.00 m. The block travels down the track, hits a spring
of force constant 2 250 N/m, and compresses the
spring 0.300 m from its equilibrium position before
coming to rest momentarily. Determine the coefficient
of kinetic friction between the block and the rough
surface between points and ©.
3.00 m
6.00 m
Figure P8.63
You are working with a team that is designing a new roller coaster-type amusement park ride for a major theme park. You
are present for the testing of the ride, in which an empty 190 kg car is sent along the entire ride. Near the end of the ride,
the car is at near rest at the top of a 102 m tall track. It then enters a final section, rolling down an undulating hill to ground
level. The total length of track for this final section from the top to the ground is 250 m. For the first 230 m, a constant
friction force of 400 N acts from computer-controlled brakes. For the last 20 m, which is horizontal at ground level, the
computer increases the friction force to a value required for the speed to be reduced to zero just as the car arrives at the
point on the track at which the passengers exit.
(a) Determine the required constant friction force (in N) for the last 20 m for the empty test car.
4905.89
N
(b) Find the highest speed (in m/s) reached by the car during the final section of track…
Chapter 6 Solutions
University Physics (14th Edition)
Ch. 6 - The sign of many physical quantities depends on...Ch. 6 - An elevator is hoisted by its cables at constant...Ch. 6 - A rope tied to a body is pulled, causing the body...Ch. 6 - If it takes total work W to give an object a speed...Ch. 6 - If there is a net nonzero force on a moving...Ch. 6 - In Example 5.5 (Section 5.1), how does the work...Ch. 6 - In the conical pendulum of Example 5.20 (Section...Ch. 6 - For the cases shown in Fig. Q6.8, the object is...Ch. 6 - A force F is in the x-direction and has a...Ch. 6 - Does a cars kinetic energy change more when the...
Ch. 6 - A falling brick has a mass of 1.5 kg and is moving...Ch. 6 - Can the total work done on an object during a...Ch. 6 - A net force acts on an object and accelerates it...Ch. 6 - A truck speeding down the highway has a lot of...Ch. 6 - You are holding a briefcase by the handle, with...Ch. 6 - When a book slides along a tabletop. the force of...Ch. 6 - Time yourself while running up a flight of steps,...Ch. 6 - Fractured Physics. Many terms from physics are...Ch. 6 - An advertisement for a portable electrical...Ch. 6 - A car speeds up while the engine delivers constant...Ch. 6 - Consider a graph of instantaneous power versus...Ch. 6 - A nonzero net force acts on an object. 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