Conceptual Physical Science Explorations
Conceptual Physical Science Explorations
2nd Edition
ISBN: 9780321567918
Author: Paul G. Hewitt, Leslie A. Hewitt, John A Suchocki
Publisher: Addison Wesley
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Textbook Question
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Chapter 6, Problem 2RAT

How much power is required to raise a 100-kg crate a vertical distance of 2m in a time of 4s ?

(a)200W

(b)500W

(c)800W

(d)2000W

Expert Solution & Answer
Check Mark
To determine

The correct option for the statement "How much power is required to raise a crate a vertical distance of 2m in a time of 4s?".

Answer to Problem 2RAT

The correct option for the statement "How much power is required to raise a crate a vertical distance of 2m in a time of 4s ?" is option (b).

Explanation of Solution

Given Info: The mass of the crate is 100-kg , the movement of the crate is 2m and time for the movement is 4s .

Write the expression for power to the book.

P= mgh t MathType@MTEF@5@5@+= feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiuaiabg2 da9maalaaabaGaamyBaiabgwSixlaadEgacqGHflY1caWGObaabaGa amiDaaaaaaa@4037@

Here,

p is the power to move the book

mis the mass to move the crate

gis the gravitational acceleration

his the movement of the crate

tis the time for the movement of the crate

Substitute 1N for F, 2m for d and 1s for t in the above expression to get p .

P= mgh t MathType@MTEF@5@5@+= feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiuaiabg2 da9maalaaabaGaamyBaiabgwSixlaadEgacqGHflY1caWGObaabaGa amiDaaaaaaa@4037@

Conclusion:

Therefore, the correct option for the statement "How much power is required to raise a 100-kg crate a vertical distance of 2m in a time of 4s ?" is option (b).

Chapter 6 Solutions

Conceptual Physical Science Explorations

Ch. 6 - Compared to some original speed, how much work...Ch. 6 - What will be the kinetic energy of a pile driver...Ch. 6 - Can a machine multiply input force Input distance...Ch. 6 - If a machine multiplies force by a factor of 4,...Ch. 6 - If the man in Figure 6.22 pulls of rope downward...Ch. 6 - What is the efficiency of a machine that...Ch. 6 - Is a machine that has efficiency greater than 100...Ch. 6 - Prob. 18RQCh. 6 - What is the source of geothermal energy?Ch. 6 - The energy we require fro existence comes from the...Ch. 6 - Calculate the work done when force of 2 N moves a...Ch. 6 - calculate the work done when a 15-N force pushes a...Ch. 6 - Calculate the watts of power expended when a force...Ch. 6 - Calculate the power expended when a 20 N force...Ch. 6 - How many joules of potential energy does a 1.5kg...Ch. 6 - Calculate the increase in potential energy when a...Ch. 6 - Calculate the number of joules of kinetic energy...Ch. 6 - Calculate the kinetic energy of a 3-kg dog that...Ch. 6 - How much work is required to increase the kinetic...Ch. 6 - What change in kinetic energy does a model...Ch. 6 - The mass and speed of three vehicles is shown...Ch. 6 - Prob. 2TCCh. 6 - The roller coaster starts from rest at point A,...Ch. 6 - Consider the efficiency of these four machines:...Ch. 6 - When the mass of a moving object is doubled with...Ch. 6 - When the velocity of an object is doubled, by what...Ch. 6 - Consider a ball thrown straight up in the air. At...Ch. 6 - At what point in its motion is the KE of a...Ch. 6 - A physical science teacher demonstrates energy...Ch. 6 - Discuss the design of the roller coaster shown in...Ch. 6 - Suppose that you and two classmates are discussing...Ch. 6 - Consider a mouse and dog running along a road have...Ch. 6 - Consider molecules of hydrogen (tiny ones) and...Ch. 6 - According to the work-energy theorem, in the...Ch. 6 - When a driver applies brake to keep a car going...Ch. 6 - On a slide a child has potential energy that...Ch. 6 - Consider the identical balls released from rest on...Ch. 6 - You tell your friend that no machine can possibly...Ch. 6 - Two lumps of clay with equal and opposite momenta...Ch. 6 - An automobile engine runs on compressed air. This...Ch. 6 - Consider the swinging-balls apparatus. If two...Ch. 6 - Does a high-efficiency machine degrade a...Ch. 6 - If an automobile had a 100% efficient engine,...Ch. 6 - A friend says that the energy of the oil and coal...Ch. 6 - How many joules of work are done when a force of...Ch. 6 - ( a ) How much work is done when you push a crate...Ch. 6 - This question is typical on some drivers license...Ch. 6 - A force of 50N is applied to the end of a lever,...Ch. 6 - Consider an ideal pulley system. If you pull one...Ch. 6 - How many watts of power expanded when a force of...Ch. 6 - How much work is done on a 100-kg crate that is...Ch. 6 - How much power is required to raise a 100-kg crate...Ch. 6 - Raising an auto in a service station increases its...Ch. 6 - A model airplane moves three times as fast as...Ch. 6 - Which of the following equations is most useful...Ch. 6 - A shiny sports car at the top of a vertical cliff...Ch. 6 - When a hybrid car brakes to a stop, much of its...Ch. 6 - In an ideal pulley system, a woman lifts a...Ch. 6 - When 100J are put into a device that puts out 40J,...Ch. 6 - A machine cannot multiply (a) forces (b)...
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