# Physical Science

posted by Brittany

If an engine must do 500 joules of work to pull a 100 N load up to a height of 4 meters, What is the efficiency of the engine?

1. bobpursley

eff=workout/workin = 4*100/500 * 100=80percent

2. Wendy

The force of gravtitation between two objects is 500 Newtons. What would the force of gravitation be if the distance between these to objects increased by 10 times?

10kg*9.81m/s^2=98.1N*4m=392.4J
392.4J/500=78.48% efficiency

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