GIVE ME THE HARDEST QUESTION IN KINETICS,KINEMATICS AND WORK,POWER , ENERGY.............
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Answers
1. What is the difference between energy and power?
2. Why is it possible to drive a nail into a piece of wood with a hammer, but it is not possible to push a nail in by hand?
3. A person pushes a 10 kg cart a distance of 20 meters by exerting a 60 Newton horizontal force. The frictional resistance force is 50 Newtons. How much work is done by each force acting ont he cart? How much kinetic energy does the cart have at the end of the 20 meters if it started from rest:
4. Assuming an efficiency of 25% for the muscle system in the process of converting food energy into mechanical work, how much energy would be used by a person of mass 75 kg (weight 165lb) in the process of climbing four flights of stairs for a total height of 15 metes? Find the answer in joules and convert to dietary calories (1 dietary calorie = 4186 Joules)
5. If frictional forces and air resistance were acting upon the falling ball in #1 would the kinetic energy of the ball just prior to striking the ground be more, less, or equal to the value predicted in #1?
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derive the relationship between friction force work and power