2011 Physics+ WEP - Name: _ 15/8/2011 PHYSICS+ Class: _11S_...

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Name: ________________________________ Class: _11S____ Date: 15/8/2011 PHYSICS + Work Energy Power 1. A car of mass 1.0 × 10 3 kg travels up a 15 ° slope at a constant speed of 5.0 ms -1 . A constant frictional force of 150 N acts to oppose the motion. (a) What is the power produced by the engine of the car to maintain this motion? (b) What is the amount of heat produced by the frictional force as the car drives up the slope for 15 s? 2. In a ballistic pendulum experiment, a 10.0 g bullet impacts a 1.0 kg stationary wooden block and gets embedded in it. Analysis of the subsequent motion revealed that the block rises to a height d of 0.95 m. What is the speed of the block after being impacted by the bullet? ceiling d bullet block 1 1 5 1 5 º
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3. A 3.0 kg box is being pulled 3.0 m up a smooth 20 ° slope by a string as shown. The constant tension T in the string is 20 N. (b) What is the work done by the string in pulling the box up the slope? (c) What is the gain in KE of the box?
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2011 Physics+ WEP - Name: _ 15/8/2011 PHYSICS+ Class: _11S_...

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