PHYSICS FOR SCIEN & ENGNR W/MOD MAST
4th Edition
ISBN: 9780134112039
Author: GIANCOLI
Publisher: PEARSON
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Textbook Question
Chapter 8, Problem 1P
(I) A spring has a spring constant k of 82.0 N/m. How much must this spring be compressed to store 35.0 J of potential energy?
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An object is subjected to a friction force with magnitude 5.49 N, which acts against the object's velocity. What is the work (in J) needed to move the object at constant speed for the following routes?
y (m)
C
B
(5.00, 5.00)
A
x (m)
©
(a) the purple path O to A followed by a return purple path to O
]
(b) the purple path O to C followed by a return blue path to O
]
(c) the blue path O to C followed by a return blue path to O
]
(d) Each of your three answers should be nonzero. What is the significance of this observation?
○ The force of friction is a conservative force.
○ The force of friction is a nonconservative force.
A block of mass m = 2.50 kg is pushed d = 2.30 m along a frictionless horizontal table by a constant applied force of magnitude F = 10.0 N directed at an angle
25.0° below the horizontal as shown in the figure below.
m
(a) Determine the work done by the applied force.
]
(b) Determine the work done by the normal force exerted by the table.
]
(c) Determine the work done by the force of gravity.
]
(d) Determine the work done by the net force on the block.
]
A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.845 m/s encounters a rough horizontal surface of length = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.357 and he exerts a constant horizontal force of 294 N on
the crate.
e
(a) Find the magnitude and direction of the net force on the crate while it is on the rough surface.
magnitude
direction
---Select---
N
(b) Find the net work done on the crate while it is on the rough surface.
]
(c) Find the speed of the crate when it reaches the end of the rough surface.
m/s
Chapter 8 Solutions
PHYSICS FOR SCIEN & ENGNR W/MOD MAST
Ch. 8.2 - By how much does the potential energy change when...Ch. 8.4 - In Example 83, what is the rock's speed just...Ch. 8.4 - Two balls are released from the same height above...Ch. 8 - List some everyday forces that are not...Ch. 8 - You lift a heavy book from a table to a high...Ch. 8 - The net force acting on a particle is conservative...Ch. 8 - When a superball is dropped, can it rebound to a...Ch. 8 - A hill has a height h. A child on a sled (total...Ch. 8 - Why is it tiring to push hard against a solid wall...Ch. 8 - Analyze the motion of a simple swinging pendulum...
Ch. 8 - In Mg. 825, water balloons are tossed from the...Ch. 8 - A coil spring of mass m rests upright on a table....Ch. 8 - What happens to the gravitational potential energy...Ch. 8 - Experienced hikers prefer to step over a fallen...Ch. 8 - (a) Where does the kinetic energy come from when a...Ch. 8 - The Earth is closest to the Sun in winter...Ch. 8 - Can the total mechanical energy E=K+Uever be...Ch. 8 - Suppose that you wish to launch a rocket from the...Ch. 8 - Recall from Chapter 4, Example 414, that you can...Ch. 8 - Two identical arrows, one with twice the speed of...Ch. 8 - A bowling ball is hung from the ceiling by a steel...Ch. 8 - A pendulum is launched from a point that is a...Ch. 8 - Describe the energy transformations when a child...Ch. 8 - Describe the energy transformations that take...Ch. 8 - Suppose you lift a suitcase from the floor to a...Ch. 8 - Repeat Question 23 for the power needed instead of...Ch. 8 - Why is it easier to climb a mountain via a zigzag...Ch. 8 - Figure 829 shows a potential energy curve, U(x)....Ch. 8 - (a) Describe in detail the velocity changes of a...Ch. 8 - Name the type of equilibrium for each position of...Ch. 8 - (I) A spring has a spring constant k of 82.0 N/m....Ch. 8 - (I) A 6.0-kg monkey swings from one branch to...Ch. 8 - (II) A spring with k = 63 N/m hangs vertically...Ch. 8 - (II) A 56.5-kg hiker starts at an elevation of...Ch. 8 - (II) A 1.60-m tall person lifts a 1.95-kg book off...Ch. 8 - (II) A 1200-kg car rolling on a horizontal surface...Ch. 8 - (II) A particular spring obeys the force law F =...Ch. 8 - (II) If U=3x2+2xy+4y2z, what is the force, F?Ch. 8 - (II) A particle is constrained to move in one...Ch. 8 - (II) A particle constrained to move in one...Ch. 8 - (I) A novice skier, starting from rest, slides...Ch. 8 - (I) Jane, looking for Tarzan, is running at top...Ch. 8 - (II) In the high jump, the kinetic energy of an...Ch. 8 - (II) A sled is initially given a shove up a...Ch. 8 - (II) A 55-kg bungee jumper leaps from a bridge....Ch. 8 - (II) A 72-kg trampoline artist jumps vertically...Ch. 8 - The total energy E of an object of mass m that...Ch. 8 - (II) A 0.40-kg hall is thrown with a speed of 8.5...Ch. 8 - (II) A vertical spring (ignore its mass), whose...Ch. 8 - (II) A roller-coaster car shown in Fig. 832 is...Ch. 8 - (II) When a mass m sits at rest on a spring, the...Ch. 8 - (II) Two masses are connected by a string as shown...Ch. 8 - (II) A block of mass m is attached to the end of a...Ch. 8 - (II) A cyclist intends to cycle up a 9.50 hill...Ch. 8 - (II) A pendulum 2.00 m long is released (from...Ch. 8 - (II) What should be the spring constant k of a...Ch. 8 - (III) An engineer is designing a spring to be...Ch. 8 - (III) A skier of mass m starts from rest at the...Ch. 8 - (I) Two railroad cars, each of mass 56,000 kg, are...Ch. 8 - (I) A 16.0-kg child descends a slide 2.20 m high...Ch. 8 - (II) A ski starts from rest and slides down a 28...Ch. 8 - (II) A 145-g baseball is dropped from a tree 14.0...Ch. 8 - (II) A 96-kg crate, starling from rest, is pulled...Ch. 8 - (II) Suppose the roller-coaster ear in Fig. 832...Ch. 8 - (II) A skier traveling 9.0 m/s reaches the fool of...Ch. 8 - (II) Consider the track shown in Fig. 837. The...Ch. 8 - (II) A 0.620-kg wood block is firmly attached to a...Ch. 8 - (II) A 180-g wood block is firmly attached to a...Ch. 8 - (II) You drop a ball from a height of 2.0 m, and...Ch. 8 - (II) A 56-kg skier starts from rest at the top of...Ch. 8 - (II) How much does your gravitational energy...Ch. 8 - (III) A spring (k = 75 N/m) has an equilibrium...Ch. 8 - (III) A 2.0-kg block slides along a horizontal...Ch. 8 - (III) Early lest flights for the space shuttle...Ch. 8 - (I) For a satellite of mass mS in a circular orbit...Ch. 8 - (I) Jill and her friends have built a small rocket...Ch. 8 - Prob. 47PCh. 8 - (II) Show that Eq. 816 for gravitational potential...Ch. 8 - (II) Determine the escape velocity from the Sun...Ch. 8 - (II) Two Earth satellites, A and B, each of mass m...Ch. 8 - (II) Show that the escape velocity for any...Ch. 8 - (II) (a) Show that the total mechanical energy of...Ch. 8 - (II) Take into account the Earths rotational speed...Ch. 8 - (II) (a) Determine a formula for the maximum...Ch. 8 - Prob. 55PCh. 8 - (II) A meteorite has a speed of 90.0 m/s when 850...Ch. 8 - (II) How much work would be required to move a...Ch. 8 - (II) (a) Suppose we have three masses, m1, m2, and...Ch. 8 - (II) A NASA satellite has just observed an...Ch. 8 - (II) A sphere of radius r1 has a concentric...Ch. 8 - Prob. 61PCh. 8 - Prob. 62PCh. 8 - (I) If a car generates 18 hp when traveling at a...Ch. 8 - (I) An 85-kg football player traveling 5.0 m/s is...Ch. 8 - (II) A driver notices that her 1080-kg car slows...Ch. 8 - (II) How much work can a 3.0-hp motor do in 1.0 h?Ch. 8 - (II) An outboard motor for a boat is rated at 55...Ch. 8 - (II) A 1400-kg sports car accelerates from rest to...Ch. 8 - (II) During a workout, football players ran up the...Ch. 8 - (II) A pump lifts 21.0 kg of water per minute...Ch. 8 - (II) A ski area claims that its lifts can move...Ch. 8 - (II) A 75-kg skier grips a moving rope that is...Ch. 8 - (III) The position of a 280-g object is given (in...Ch. 8 - (III) A bicyclist coasts clown a 6.0 hill at a...Ch. 8 - Draw a potential energy diagram, U vs. x, and...Ch. 8 - (II) The spring of Problem 75 has a stiffness...Ch. 8 - (III) The potential energy of the two atoms in a...Ch. 8 - (III) The binding energy of a two-particle system...Ch. 8 - What is the average power output of an elevator...Ch. 8 - A projectile is fired at an upward angle of 48.0...Ch. 8 - Water flows over a clam at the rate of 580kg/s and...Ch. 8 - A bicyclist of mass 75 kg (including the bicycle)...Ch. 8 - A 62-kg skier starts from rest at the top of a ski...Ch. 8 - Repeat Problem 83, but now assume the ski jump...Ch. 8 - A ball is attached to a horizontal cord of length ...Ch. 8 - Show the h must be greater than 0.60 if the ball...Ch. 8 - Show that on a roller coaster with a circular...Ch. 8 - If you stand on a bathroom scale, the spring...Ch. 8 - A 65-kg hiker climbs to the top of a 4200-m-high...Ch. 8 - The small mass m sliding without friction along...Ch. 8 - A 56-kg student runs at 5.0 m/s, grabs a hanging...Ch. 8 - The nuclear force between two neutrons in a...Ch. 8 - A fire hose for use in urban areas must be able to...Ch. 8 - A 16-kg sled starts up a 28 incline with a speed...Ch. 8 - The Lunar Module could make a safe landing if its...Ch. 8 - Proper design of automobile braking systems must...Ch. 8 - Some electric power companies use water to store...Ch. 8 - Estimate the energy required from fuel to launch a...Ch. 8 - Prob. 99GPCh. 8 - Suppose the gravitational potential energy of an...Ch. 8 - (a) If the human body could convert a candy bar...Ch. 8 - Electric energy units are often expressed in the...Ch. 8 - Chris jumps off a bridge with a bungee cord (a...Ch. 8 - In a common test for cardiac function (the stress...Ch. 8 - (a) If a volcano spews a 450-kg rock vertically...Ch. 8 - A film of Jesse Owenss famous long jump (Fig. 849)...Ch. 8 - An elevator cable breaks when a 920-kg elevator is...Ch. 8 - A particle moves where its potential energy is...Ch. 8 - A particle of mass m moves under the influence of...Ch. 8 - Prob. 110GP
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