College Physics:
11th Edition
ISBN: 9781305965515
Author: SERWAY, Raymond A.
Publisher: Brooks/Cole Pub Co
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Textbook Question
Chapter 5, Problem 7CQ
As a mass tied to the end of a string strings from its highest point down to its lowest point, it is acted on by three forces: gravity, tension, and air resistance. Which force does (a) positive work? (b) negative work? (c) zero work?
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6. A car drives at steady speed around a perfectly
circular track.
(a) The car's acceleration is zero.
(b) The net force on the car is zero.
(c) Both the acceleration and net force on the car
point outward.
(d) Both the acceleration and net force on the car
point inward.
(e) If there is no friction, the acceleration is
outward.
9. A spring has a force constant of 100 N/m and an
unstretched length of 0.07 m. One end is attached to
a post that is free to rotate in the center of a smooth.
table, as shown in the top view in the figure below.
The other end is attached to a 1kg disc moving in
uniform circular motion on the table, which
stretches the spring by 0.03 m. Friction is negligible.
What is the centripetal force on the disc?
Top View
(a)
0.3 N
(b)
3.0 N
(c)
10 N
(d)
300 N
(e)
1000 N
4. A child has a ball on the end of a cord, and whirls
the ball in a vertical circle. Assuming the speed of
the ball is constant (an approximation), when would
the tension in the cord be greatest?
(a) At the top of the circle.
(b) At the bottom of the circle.
(c) A little after the bottom of the circle when the
ball is climbing.
(d) A little before the bottom of the circle when the
ball is descending quickly.
(e) Nowhere; the cord is pulled the same amount at
all points.
Chapter 5 Solutions
College Physics:
Ch. 5.1 - In Figure 5.5 (a)-(d), a block moves to the right...Ch. 5.2 - A block slides at constant speed down a ramp while...Ch. 5.3 - Three identical halls are thrown from the top of a...Ch. 5.3 - Bob, of mass m, drops from a tree limb at the same...Ch. 5.5 - Calculate the elastic potential energy of a spring...Ch. 5.5 - True or False: The elastic potential energy of a...Ch. 5.5 - Elastic potential energy depends on the spring...Ch. 5.6 - A book of mass in is projected with a speed v...Ch. 5 - Consider a tug-of-war as in Figure CQ5.1, in which...Ch. 5 - Choose the best answer. A car traveling at...
Ch. 5 - (a) If the height of a playground slide is kept...Ch. 5 - (a) Can the kinetic energy of a system be...Ch. 5 - Two toboggans (with riders) of the same mass are...Ch. 5 - A bowling ball is suspended from the ceiling of a...Ch. 5 - As a mass tied to the end of a string strings from...Ch. 5 - Discuss whether any work is being done by each of...Ch. 5 - When a punter kicks a football, is he doing any...Ch. 5 - The driver of a car slams on her brakes to avoid...Ch. 5 - A weight is connected to a spring that is...Ch. 5 - For each of the situations given, state whether...Ch. 5 - Suppose you are reshelving books in a library. As...Ch. 5 - Two stones, one with twice the mass of the other,...Ch. 5 - An Earth satellite is in a circular orbit at an...Ch. 5 - Mark and David are loading identical cement blocks...Ch. 5 - If the speed of a particle is doubled, what...Ch. 5 - A certain truck has twice the mass of a car. Both...Ch. 5 - If the net work done on a particle is zero, which...Ch. 5 - A car accelerates uniformly from rest. Ignoring...Ch. 5 - A weight lifter lifts a 350-N set of weights from...Ch. 5 - In 1990 Walter Arfeuille of Belgium lifted a...Ch. 5 - A cable exerts a constant upward tension of...Ch. 5 - a shopper in a supermarket pushes a cart with a...Ch. 5 - Starting from rest, a 5.00-kg block slides 2.50 m...Ch. 5 - A horizontal force of 150 N is used to push a...Ch. 5 - A tension force of 175 N inclined at 20.0 above...Ch. 5 - A block of mass m = 2.50 kg is pushed a distance d...Ch. 5 - A mechanic pushes a 2.50 103-kg car from rest to...Ch. 5 - A 7.00-kg bowling ball moves at 3.00 m/s. 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It has been...Ch. 5 - A 50.0-kg projectile is fired at an angle of 30.0...Ch. 5 - A projectile of mass m is fired horizontally with...Ch. 5 - A horizontal spring attached to a wall has a force...Ch. 5 - A 50.-kg pole vaulter running at 10. m/s vaults...Ch. 5 - A child and a sled with a combined mass of 50.0 kg...Ch. 5 - A 35.0-cm long spring is hung vertically from a...Ch. 5 - A 0.250-kg block along a horizontal track has a...Ch. 5 - A block of mass m = 5.00 kg is released from rest...Ch. 5 - Tarzan savings on a 30.0-m-long vine initially...Ch. 5 - Two blocks are connected by a light string that...Ch. 5 - The launching mechanism of a toy gun consists of a...Ch. 5 - (a) A block with a mass m is pulled along a...Ch. 5 - (a) A child slides down a water slide at an...Ch. 5 - An airplane of mass 1.50 104 kg is moving at 60.0...Ch. 5 - The system shown in Figure P5.43 is used to lift...Ch. 5 - A 25.0-kg child on a 2.00-m-long swing is released...Ch. 5 - A 2.1 103-kg car starts from rest at the top of a...Ch. 5 - A child of mass m starts from rest and slides...Ch. 5 - A skier starts from rest at the top of a hill that...Ch. 5 - In a circus performance, a monkey is strapped to a...Ch. 5 - An 80.0-kg skydiver jumps out of a balloon at an...Ch. 5 - Q A skier of mass 70.0 kg is pulled up a slope by...Ch. 5 - What average mechanical power must a 70.0-kg...Ch. 5 - While running, a person dissipates about 0.60 J of...Ch. 5 - The electric motor of a model train accelerates...Ch. 5 - When an automobile moves with constant speed down...Ch. 5 - Under normal conditions the human heart converts...Ch. 5 - Prob. 56PCh. 5 - A 1.50 103-kg car starts from rest and...Ch. 5 - A 6.50 102-kg elevator starts from rest and moves...Ch. 5 - The force acting on a particle varies as in Figure...Ch. 5 - An object of mass 3.00 kg is subject to a force Fx...Ch. 5 - The force acting on an object is given by Fx = (8x...Ch. 5 - An outfielder throws a 0.150-kg baseball at a...Ch. 5 - A roller-coaster car of mass 1.50 103 kg is...Ch. 5 - A ball of mass m = 1.80 kg is released from rest...Ch. 5 - An archer pulls her bowstring back 0.400 m by...Ch. 5 - A block of mass 12.0 kg slides from rest down a...Ch. 5 - (a) A 75-kg man steps out a window and falls (from...Ch. 5 - A toy gun uses a spring to project a 5.3-g soft...Ch. 5 - Two objects (m1 = 5.00 kg and m2 = 3.00 kg) are...Ch. 5 - A 3.50-kN piano is lilted by three workers at...Ch. 5 - A 2.00 102-g particle is released from rest at...Ch. 5 - The particle described in Problem 71 (Fig. P5.71)...Ch. 5 - In terms of saving energy, bicycling and walking...Ch. 5 - A 50.0-kg student evaluates a weight loss program...Ch. 5 - A ski jumper starts from rest 50.0 m above the...Ch. 5 - A 5.0-kg block is pushed 3.0 m up a vertical wall...Ch. 5 - A childs pogo slick (Fig. P5.77) stores energy in...Ch. 5 - A hummingbird hovers by exerting a downward force...Ch. 5 - In the dangerous sport of bungee jumping, a daring...Ch. 5 - Apollo 14 astronaut Alan Shepard famously took two...Ch. 5 - A truck travels uphill with constant velocity on a...Ch. 5 - As a 75.0-kg man steps onto a bathroom scale, the...Ch. 5 - Prob. 83APCh. 5 - A cat plays with a toy mouse suspended from a...Ch. 5 - Three objects with masses m1 = 5.00 kg, m2 = 10.0...Ch. 5 - Two blocks, A and B (with mass 50.0 kg and 1.00 ...
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