Physics Work exam 4.docx - Physics Work Mr Shilian Teacher...

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Physics Work Mr Shilian Teacher Answer Key January 16, 2015 4 1. A constant force of 1900 newtons is required to keep an automobile having a mass of 1.0 X 10 3 kilograms moving at a constant speed of 20. meters per second. The work done in moving the automobile a distance of 2.0 X 10 3 meters is 1. 2.0 X 10 4 J 3. 2.0 X 10 6 J 2. 3.8 X 10 4 J 4. 3.8 X 10 6 J
2 2. Which quantity is a measure of the rate at which work is done?
1 3. A block weighing 15 newtons is pulled to the top of an incline that is 0.20 meter above the ground, as shown. If 4.0 Joules of work are needed to pull the block the full length of the incline, how much work is done against friction?
'see explanation below' 4 . Base your answer on the following information and the accompanying diagram. A 20.-kilogram block is placed at the top of a 10.-meter-long inclined plane. The block

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