A horse is working steadily, providing 750 W of output power. How much food energy does the horse need to work for 1 hour, to the nearest MJ

Under assumption that all food energy that needs the horse is transformed into work, then the horse needs approximately 3 megajoules of food energy to work for 1 hour.

Explanation:

Since horse is working steadily, the power experimented by the horse (), measured in watts, is at constant rate. Then, the work needed by the horse (), measured in joules, is equal to that power multiplied by time (), measured in seconds. That is:

(1)

If we know that and , then the work needed for the horse is:

Under assumption that all food energy that needs the horse is transformed into work, then the horse needs approximately 3 megajoules of food energy to work for 1 hour.

the force on the thing and the distance the force moves the thing

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