EP CONCEPTUAL PHYSICS-ONLINE ACCESS
9th Edition
ISBN: 9780133246810
Author: Hewitt
Publisher: SAVVAS L
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Textbook Question
Chapter 9, Problem 41A
How much work is required to increase the kinetic energy of a car by 5000 J?
Expert Solution & Answer
To determine
Work required to increase the kinetic energy.
Answer to Problem 41A
Explanation of Solution
Given:
The increase in kinetic energy is,
Formula Used:
The work required is equal to the change in kinetic energy, that is
Work = ? KE
Calculation:
As work done is equal to the increase in kinetic energy and change in kinetic energy is
So, work required is
Conclusion:
Therefore, the work required is
Chapter 9 Solutions
EP CONCEPTUAL PHYSICS-ONLINE ACCESS
Ch. 9 - A force sets an object in motion. When the force...Ch. 9 - Work is required to lift a barbell. How many times...Ch. 9 - Which requires more work, lifting a 10-kg load a...Ch. 9 - How many joules of work are done on an object when...Ch. 9 - How much power is required to do 100 J of work on...Ch. 9 - What are the two main forms of mechanical energy?Ch. 9 - Prob. 7ACh. 9 - A boulder is raised above the ground so that its...Ch. 9 - Suppose you know the amount of work the brakes of...Ch. 9 - How does speed affect the friction between a road...
Ch. 9 - What will be the kinetic energy of an arrow having...Ch. 9 - What does it mean to say that in any system the...Ch. 9 - In what sense is energy from coal actually solar...Ch. 9 - How does the amount of work done on an automobile...Ch. 9 - In what two ways can a machine alter an input...Ch. 9 - In what way is a machine subject to the law of...Ch. 9 - What does it mean to say that a machine has a...Ch. 9 - In which type of lever is the output force smaller...Ch. 9 - What is the efficiency of a machine that requires...Ch. 9 - Distinguish between theoretical mechanical...Ch. 9 - What is the efficiency of her body when a cyclist...Ch. 9 - In what sense are our bodies machines?Ch. 9 - Prob. 23ACh. 9 - What is the ultimate source of geothermal energy?Ch. 9 - Can we correctly say that a new source of energy...Ch. 9 - The mass and speed of three vehicles are shown...Ch. 9 - Consider these four situations. (A) a 3-kg ball at...Ch. 9 - A ball is released at the left end of the metal...Ch. 9 - The roller coaster ride starts with the car at...Ch. 9 - Rank the efficiency of these machines from highest...Ch. 9 - Prob. 31ACh. 9 - Rank the scale readings from greatest to least....Ch. 9 - Calculate the work done when a force of 1 N moves...Ch. 9 - Calculate the work done when a 20-N force pushes a...Ch. 9 - Calculate the work done in lifting a 500-N barbell...Ch. 9 - Calculate the watts of power expended when a force...Ch. 9 - Calculate the power expended when a 20-N force...Ch. 9 - How many joules of potential energy does a 1-kg...Ch. 9 - Calculate the increase in potential energy when a...Ch. 9 - Calculate the number of joules of kinetic energy a...Ch. 9 - How much work is required to increase the kinetic...Ch. 9 - What change in kinetic energy does an airplane...Ch. 9 - Which requires more work: stretching a strong...Ch. 9 - Two people who weigh the same amount climb a...Ch. 9 - A physics teacher demonstrates energy conservation...Ch. 9 - Consider the kinetic energy of a fly in the cabin...Ch. 9 - When a driver applies brakes to keep a car going...Ch. 9 - What is the theoretical mechanical advantage for...Ch. 9 - Dry-rock geothermal power can be a major...Ch. 9 - A stuntman on a cliff has a PE of 10,000 J. Show...Ch. 9 - Relative to the ground below, how many joules of...Ch. 9 - A hammer falls off a rooftop and strikes the...Ch. 9 - A car can go from 0 to 100 km/h in 10 s. If the...Ch. 9 - If a car traveling at 60 km/h will skid 20 m when...Ch. 9 - Place a small rubber ball on top of a basketball...
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