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Physics problems: conservation laws

Part 3

 

Problem 21.

A moving body weighing 400 N possesses 500 J of kinetic energy.  Calculate the velocity with which the body is moving. 

Solution

 

Problem 22.

The work done by the heart is 1 joule per beat.  Calculate the power of the heart if it beats 72 times in one minute.

Solution

 

 

 

 

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