Conceptual Physical Science (6th Edition)
6th Edition
ISBN: 9780134060491
Author: Paul G. Hewitt, John A. Suchocki, Leslie A. Hewitt
Publisher: PEARSON
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Chapter 3, Problem 45PAC
Show that 24 J of work is done when a 3.0-kg block of ice is moved from rest to a speed of 4.0 m/s.
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Chapter 3 Solutions
Conceptual Physical Science (6th Edition)
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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- 2. Consider the situation described in problem 1 where light emerges horizontally from ground level. Take k = 0.0020 m' and no = 1.0001 and find at which horizontal distance, x, the ray reaches a height of y = 1.5 m.arrow_forward2-3. Consider the situation of the reflection of a pulse at the interface of two string described in the previous problem. In addition to the net disturbances being equal at the junction, the slope of the net disturbances must also be equal at the junction at all times. Given that p1 = 4.0 g/m, H2 = 9.0 g/m and Aj = 0.50 cm find 2. A, (Answer: -0.10 cm) and 3. Ay. (Answer: 0.40 cm)please I need to show all work step by step problems 2 and 3arrow_forwardFrom number 2 and 3 I just want to show all problems step by step please do not short cut look for formulaarrow_forward
- Look at the answer and please show all work step by steparrow_forward3. As a woman, who's eyes are h = 1.5 m above the ground, looks down the road sees a tree with height H = 9.0 m. Below the tree is what appears to be a reflection of the tree. The observation of this apparent reflection gives the illusion of water on the roadway. This effect is commonly called a mirage. Use the results of questions 1 and 2 and the principle of ray reversibility to analyze the diagram below. Assume that light leaving the top of the tree bends toward the horizontal until it just grazes ground level. After that, the ray bends upward eventually reaching the woman's eyes. The woman interprets this incoming light as if it came from an image of the tree. Determine the size, H', of the image. (Answer 8.8 m) please show all work step by steparrow_forwardNo chatgpt pls will upvotearrow_forward
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