College Physics
7th Edition
ISBN: 9780321601834
Author: Jerry D. Wilson, Anthony J. Buffa, Bo Lou
Publisher: Addison-Wesley
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Chapter 4, Problem 2MCQ
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Truck suspensions often have "helper springs" that engage at high loads. One such arrangement is a leaf spring with a helper coil spring mounted on the axle, as in the figure below. The helper spring engages when the main leaf spring is compressed by distance yo, and then helps to
support any additional load. Consider a leaf spring constant of 5.45 × 105 N/m, helper spring constant of 3.60 × 105 N/m, and y = 0.500 m.
Truck body
Dyo
Axle
(a) What is the compression of the leaf spring for a load of 4.90 × 105 N?
m
(b) How much work is done compressing the springs?
]
A skier of mass 75 kg is pulled up a slope by a motor-driven cable.
(a) How much work is required to pull him 50 m up a 30° slope (assumed frictionless) at a constant speed of 2.8 m/s?
KJ
(b) What power (expressed in hp) must a motor have to perform this task?
hp
A block of mass 1.4 kg is attached to a horizontal spring that has a force constant 900 N/m as shown in the figure below. The spring is compressed 2.0 cm and is then released from rest.
a
x = 0
x
b
(a) A constant friction force of 4.4 N retards the block's motion from the moment it is released. Using an energy approach, find the position x of the block at which its speed is a maximum.
cm
(b) Explore the effect of an increased friction force of 13.0 N. At what position of the block does its maximum speed occur in this situation?
cm
Chapter 4 Solutions
College Physics
Ch. 4 - Prob. 1MCQCh. 4 - A force (a) always produces motion, (b) is a...Ch. 4 - If an object is moving at constant velocity, (a)...Ch. 4 - If the net force on an object is zero, the object...Ch. 4 - The force required to keep a rocket ship moving at...Ch. 4 - Prob. 6MCQCh. 4 - Prob. 7MCQCh. 4 - The weight of an object is directly proportional...Ch. 4 - Prob. 9MCQCh. 4 - A brick hits a glass window. The brick breaks the...
Ch. 4 - Prob. 11MCQCh. 4 - Prob. 12MCQCh. 4 -
The condition(s) for translational equilibrium is...Ch. 4 - Prob. 14MCQCh. 4 - Prob. 15MCQCh. 4 - Prob. 16MCQCh. 4 - Prob. 17MCQCh. 4 - Prob. 1CQCh. 4 - Prob. 2CQCh. 4 - Prob. 3CQCh. 4 - Prob. 4CQCh. 4 - Prob. 5CQCh. 4 - The following is an old trick (Fig. 4.28). If a...Ch. 4 - Prob. 7CQCh. 4 - A student weighing 600 N crouches on a scale and...Ch. 4 - An astronaut has a mass of 70 kg when measured on...Ch. 4 -
In general, this chapter has considered forces...Ch. 4 - Prob. 11CQCh. 4 - Prob. 12CQCh. 4 - Prob. 13CQCh. 4 - Prob. 14CQCh. 4 - Prob. 16CQCh. 4 - Prob. 17CQCh. 4 -
Identify the direction of the friction force in...Ch. 4 - Prob. 19CQCh. 4 - Prob. 20CQCh. 4 - Prob. 21CQCh. 4 - Prob. 22CQCh. 4 - Prob. 23CQCh. 4 - Which has more inertia, 20 cm3 of water or 10 cm3...Ch. 4 - Prob. 2ECh. 4 - In Exercise 2, if the 35-N force acted downward at...Ch. 4 -
A net force of 4.0 N gives an object an...Ch. 4 - Prob. 5ECh. 4 - Prob. 6ECh. 4 - A 5.0-kg block at rest on a frictionless surface...Ch. 4 - (a) You are told that an object has zero...Ch. 4 - A fish weighing 25 lb is caught and hauled onto...Ch. 4 - A 1.5-kg object moves up the y-axis at a constant...Ch. 4 - Three horizontal forces (the only horizontal ones)...Ch. 4 - Prob. 12ECh. 4 - Prob. 13ECh. 4 - Prob. 14ECh. 4 - IE ● A 6.0-kg object is brought to the Moon, where...Ch. 4 - A gun is fired and a 50-g bullet is accelerated to...Ch. 4 - Prob. 17ECh. 4 - Prob. 18ECh. 4 - Prob. 19ECh. 4 - Prob. 20ECh. 4 - Prob. 21ECh. 4 - Prob. 22ECh. 4 - Prob. 23ECh. 4 - Prob. 24ECh. 4 - An object (mass 10.0 kg) slides upward on a...Ch. 4 - In an emergency stop to avoid an accident, a...Ch. 4 - Prob. 27ECh. 4 - A force of 10 N acts on two blocks on a...Ch. 4 - Prob. 29ECh. 4 - In a pole-sliding game among friends, a 90-kg man...Ch. 4 - A book is sitting on a horizontal surface. (a)...Ch. 4 - In an Olympic figure-skating event, a 65-kg male...Ch. 4 -
A sprinter of mass 65.0 kg starts his race by...Ch. 4 - Jane and John, with masses of 50 kg and 60 kg,...Ch. 4 - Prob. 35ECh. 4 - A 75.0-kg person is standing on a scale in an...Ch. 4 - Prob. 37ECh. 4 - Prob. 38ECh. 4 - The weight of a 500-kg object is 4900 N. (a) When...Ch. 4 - A boy pulls a box of mass 30 kg with a force of 25...Ch. 4 - Prob. 41ECh. 4 - Prob. 42ECh. 4 - Prob. 43ECh. 4 - Prob. 44ECh. 4 - Prob. 45ECh. 4 - Assuming ideal frictionless conditions for the...Ch. 4 - Prob. 47ECh. 4 -
A55-kg gymnast hangs vertically from a pair of...Ch. 4 - A physicist’s car has a small lead weight...Ch. 4 - A 10-kg mass is suspended as shown in Fig. 4.41....Ch. 4 - Prob. 51ECh. 4 - Prob. 52ECh. 4 - Prob. 53ECh. 4 - A horizontal force of 40 N acting on a block on a...Ch. 4 - The Atwood machine consists of two masses...Ch. 4 - Prob. 56ECh. 4 - Prob. 57ECh. 4 - Prob. 58ECh. 4 - Prob. 59ECh. 4 - In the frictionless apparatus shown in Fig. 4.43,...Ch. 4 - In the ideal setup shown in Fig. 4.43, m1 = 3.0 kg...Ch. 4 - A20-kg box sits on a rough horizontal surface....Ch. 4 - Prob. 63ECh. 4 - Prob. 64ECh. 4 - Prob. 65ECh. 4 - Prob. 66ECh. 4 - A 1500-kg automobile travels at 90 km/h along a...Ch. 4 - Prob. 68ECh. 4 - Prob. 69ECh. 4 - Prob. 70ECh. 4 - Prob. 71ECh. 4 - Prob. 72ECh. 4 - Suppose the slope conditions for the skier shown...Ch. 4 - Prob. 74ECh. 4 - A block that has a mass of 2.0 kg and is 10 cm...Ch. 4 - In the apparatus shown in Fig. 4.46, m1 = 10 kg...Ch. 4 - In loading a fish delivery truck, a person pushes...Ch. 4 -
An object (mass 3.0 kg) slides upward on a...Ch. 4 - For the apparatus shown in Fig. 4.40, what is the...Ch. 4 - Prob. 81ECh. 4 - Prob. 82ECh. 4 - Prob. 83ECh. 4 - Prob. 84ECh. 4 - Prob. 85ECh. 4 - Prob. 86ECh. 4 - Prob. 87ECh. 4 - Prob. 88E
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