A man holds a child on his shoulders while watching a football match.How much work has he done if the game last for two hours
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ANSWER
To determine the amount of work the man has done while holding the child on his shoulders for a two-hour football match, we need to understand what work is in the context of physics.
In physics, work is defined as the product of force applied on an object and the displacement of that object in the direction of the force. Mathematically, work (W) is given by the equation:
W = F * d * cos(theta)
where F is the applied force, d is the displacement, and theta is the angle between the applied force and the displacement.
In this scenario, we assume that the man is exerting a force to hold the child on his shoulders against the force of gravity. However, since he is not moving horizontally or vertically during the football match, there is no displacement in the direction of the applied force. Therefore, the work done by the man in this situation is zero.
This is because work only occurs when there is a displacement in the direction of the applied force. Holding the child on the man's shoulders requires muscular effort, but it does not involve any work as defined in physics.
So, in conclusion, if the man holds the child on his shoulders for a two-hour football match, assuming no movement occurs, he would not be doing any work from a physics standpoint.