EP CONCEPTUAL PHYSICAL SCI.-MOD.MASTER.
6th Edition
ISBN: 9780134091983
Author: Hewitt
Publisher: PEARSON CO
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Textbook Question
Chapter 3, Problem 86E
A fully dressed person is at rest in the middle of a pond on perfectly frictionless ice and must get to shore. How can this be accomplished? Explain in terms of momentum conservation.
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Chapter 3 Solutions
EP CONCEPTUAL PHYSICAL SCI.-MOD.MASTER.
Ch. 3 - Which has greater momentum: an automobile at rest...Ch. 3 - When a ball is hit with a given force, why does...Ch. 3 - Why is it a good idea to extend your bare hand...Ch. 3 - Why is it poor judgment to have the back of your...Ch. 3 - Why is it advantageous, in karate, to apply a...Ch. 3 - Prob. 6RCQCh. 3 - If a ball has the same speed just before being...Ch. 3 - In which of cases (1), (2), and (3) in Question 7...Ch. 3 - What does it mean to say that momentum (or any...Ch. 3 - When a cannonball is fired, momentum is conserved...
Ch. 3 - Railroad car A rolls at a certain speed and makes...Ch. 3 - If the equally massive railroad cars of Question...Ch. 3 - When is energy most evident?Ch. 3 - Cite an example in which a force is exerted on an...Ch. 3 - Which requires more work: lifting a 50-kg sack a...Ch. 3 - A car is raised a certain distance in a service...Ch. 3 - Two cars are raised to the same elevation on...Ch. 3 - If a moving car speeds up until it is going three...Ch. 3 - What is the relationship between work and power?Ch. 3 - What is the relationship between the gain in...Ch. 3 - Compared with the work that the brakes must supply...Ch. 3 - What will be the kinetic energy of the ram of a...Ch. 3 - An apple hanging from a limb has potential energy...Ch. 3 - Can a machine multiply input force? Input...Ch. 3 - If a machine multiplies force by a factor of 4,...Ch. 3 - What is the efficiency of a machine that...Ch. 3 - What becomes of energy when efficiency is lowered...Ch. 3 - What is the ultimate source of the energy supplied...Ch. 3 - What is the ultimate source of geothermal energy?Ch. 3 - Can we correctly say that hydrogen is a relatively...Ch. 3 - Show that the momentum for a 2-kg brick...Ch. 3 - Show that the impulse on a baseball that is hit...Ch. 3 - Show that when a 10-kg cart undergoes a 2.0-m/s...Ch. 3 - Show that when an impulse produced by a 12-N force...Ch. 3 - Show that 2.4 J of work is done when a force of...Ch. 3 - Calculate the work done when a 20-N force pushes a...Ch. 3 - Show that when a 3.0-kg book is lifted 2.0 m, its...Ch. 3 - Show that the gravitational potential energy of a...Ch. 3 - Show that the kinetic energy of a 1.0-kg book...Ch. 3 - Calculate the kinetic energy of a 84-kg scooter...Ch. 3 - Show that 24 J of work is done when a 3.0-kg block...Ch. 3 - Show that a 2,500,000-J change in kinetic energy...Ch. 3 - Show that 50 W of power is required to give a...Ch. 3 - Show that nearly 786 W of power is expended when a...Ch. 3 - Show that the efficiency of a machine that has an...Ch. 3 - In Chapter 1 we learned that acceleration a=vt,...Ch. 3 - A 10-kg bag of groceries is tossed onto a table at...Ch. 3 - An ostrich egg of mass m is tossed at a speed v...Ch. 3 - A 6-kg bail rolling at 3 m/s bumps into a pillow...Ch. 3 - At a baseball game, a ball of mass m = 0.15 kg...Ch. 3 - Jeannie Beanie (mass 40 kg), standing on slippery...Ch. 3 - A railroad diesel engine weighs four times as much...Ch. 3 - A 5-kg fish swimming at 1 m/s swallows an...Ch. 3 - Little Hudson (next page) holds the 10-kgbarbell...Ch. 3 - It you push a crate horizontally with a force of...Ch. 3 - A simple lever is used to lift a heavy load. When...Ch. 3 - The following questions refer to Problem 60: (a)...Ch. 3 - In raising a 6000-N piano with a pulley system,...Ch. 3 - The girl steadily pulls her end of the rope upward...Ch. 3 - How many watts of power do you expend when you...Ch. 3 - Show that 480 W of power is expended by a...Ch. 3 - When an average force F is exerted over a certain...Ch. 3 - Emily holds a banana of mass m over the edge of a...Ch. 3 - Starting from rest, Megan Zooms down a...Ch. 3 - The balls have different masses and speeds. Rank...Ch. 3 - Jogging Jake runs along a train flatcar that moves...Ch. 3 - Starting from rest, Marshall pushes crates across...Ch. 3 - A ball is released from rest at the left of the...Ch. 3 - The roller coaster ride starts from rest at point...Ch. 3 - Rank the scale readings from greatest to least....Ch. 3 - A lunar vehicle is tested on Earth at a speed of...Ch. 3 - In terms of impulse and momentum, why do airbags...Ch. 3 - Why are todays autos designed to crumple upon...Ch. 3 - If you throw a raw egg against a wall, youll break...Ch. 3 - In terms of impulse and momentum, when a boxer is...Ch. 3 - To throw a ball, do you exert an impulse on it? Do...Ch. 3 - Bronco dives from a hovering helicopter and finds...Ch. 3 - A pair of skaters who are initially at rest push...Ch. 3 - When you are traveling in your car at highway...Ch. 3 - You are at the front of a floating canoe near a...Ch. 3 - If you throw a ball horizontally while standing on...Ch. 3 - A fully dressed person is at rest in the middle of...Ch. 3 - Prob. 87ECh. 3 - In the previous chapter, rocket propulsion was...Ch. 3 - When vertically falling sand lands in a...Ch. 3 - In a movie, the hero jumps straight down from a...Ch. 3 - Freddy Frog drops vertically from a tree onto a...Ch. 3 - If your friend pushes a stroller four times as far...Ch. 3 - Which requires more work: stretching a strong...Ch. 3 - Two people of the same weight climb a flight of...Ch. 3 - Why do you run out of breath when running up the...Ch. 3 - A friend says that when twice as much works is...Ch. 3 - Compared with a pickup truck moving at a certain...Ch. 3 - When a cannon with a long barrel is fired, the...Ch. 3 - At what point in its motion is the KE of a...Ch. 3 - A physics instructor demonstrates energy...Ch. 3 - On a playground slide, a child has potential...Ch. 3 - Consider the identical balls released from rest on...Ch. 3 - Prob. 103ECh. 3 - In the absence of air resistance, a snowball...Ch. 3 - Youre on a rooftop and you throw one snowball...Ch. 3 - When a driver applies the brakes 10 keep a car...Ch. 3 - When the mass of a moving object is doubled, with...Ch. 3 - When the velocity of an object it doubled, by what...Ch. 3 - Which, if either, has greater momentum a 1-kg ball...Ch. 3 - If an objects kinetic energy is zero, what is its...Ch. 3 - If your momentum is zero, is your kinetic energy...Ch. 3 - Two lumps of clay with equal and opposite momenta...Ch. 3 - Consider Charlottes swinging-balls apparatus. If...Ch. 3 - Discuss the physics that explains how the girl in...Ch. 3 - Why bother using a machine if it cannot multiply...Ch. 3 - In the pulley system shown, Block A has a mass of...Ch. 3 - If an automobile had a 100% efficient engine,...Ch. 3 - The energy we need to live comes from chemically...Ch. 3 - To combat wasteful habits, we often speak of...Ch. 3 - What is the argument that dry-rock geothermal...Ch. 3 - What is the argument that the energy provided by a...Ch. 3 - What is the fuel that power a fuel cell in...Ch. 3 - Prob. 123ECh. 3 - Railroad cars are loosely coupled so that there is...Ch. 3 - Your friend says that the law of momentum...Ch. 3 - An ice sailcraft is stalled on a frozen lake on a...Ch. 3 - Will your answer to Question 126 be different if...Ch. 3 - Discuss the advisability of simply removing the...Ch. 3 - Suppose that three astronauts outside a spaceship...Ch. 3 - Discuss whether something can have energy without...Ch. 3 - Arrange the following four energy-transforming...Ch. 3 - What are the roles of water, energy, hydrogen, and...Ch. 3 - Does a car burn more fuel when its lights are...Ch. 3 - This may seem like an easy question for a physics...Ch. 3 - Your friend says that one way to improve air...Ch. 3 - Does the electric power produced by wind-powered...Ch. 3 - A red ball of mass m and a blue ball of mass 2m...Ch. 3 - No work is done by gravity on a bowling ball...Ch. 3 - Consider a bob attached by a stringa simple...Ch. 3 - Consider a satellite in a circular orbit above...Ch. 3 - A freight train rolls along a track with...Ch. 3 - In the absence of external forces, momentum is...Ch. 3 - If the running speed of Fast Freda doubles, what...Ch. 3 - Which of the following equations best illustrate s...Ch. 3 - Which of the following equations is most useful...Ch. 3 - How much work is done on a 200-kg crate that is...Ch. 3 - A circus diver drops from a high pole into water...Ch. 3 - A bicycle that travels twice as fast as another...Ch. 3 - A bicycle that travels twice as fast as another...Ch. 3 - A machine cannot multiply (a) force. (b) distance....
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