An object is falling under the influence of gravity in presence of air resistance . There are two forces acting on it. (i) What
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Answer:
a) The work done by the force is 720 joules, b) The power supplied by the force is 138 watts.
Explanation:
a) Since force is uniform and parallel to the direction of motion, the work (), in joules, done by the force (
), in newtons, is defined by this formula:
(1)
Where is the travelled distance, in meters.
If we know that and
, then the work done by the force is:
The work done by the force is 720 joules.
b) And an expression for the power supplied by the force (), in watts, is concieved by differentiating (1) in time:
Where is the speed of the wagon, in meters per second.
If we know that and
, then the power supplied by the force is:
The power supplied by the force is 138 watts.