A 403-kg pile driver (the figure below) is raised 11 m above ground. (a) How muc

Question

A 403-kg pile driver (the figure below) is raised 11 m above ground.

(a) How much work must be done to raise the pile driver?
______kJ

(b) How much work does gravity do on the driver as it is raised?
_______kJ

(c) The driver is now dropped. How much work does gravity do on the driver as it falls?
_______kJ

A 403-kg pile driver (the figure below) is raised 11 m above ground. 6-p-006.gif (a) How much work must be done to raise the pile driver? ______kJ (b) How much work does gravity do on the driver as it is raised? _______kJ (c) The driver is now dropped. How much work does gravity do on the driver as it falls? _______kJ

Explanation / Answer

the question is asking about gravity doing the work, it's doing negative work because it's acting to oppose the effort to raise the pile driver. This negative work is equal in magnitude to the potential energy gained by raising the pile driver 11m above ground:

Work done by gravity = -1*mgh = -1*403kg*9.81m/s/s*11m

So, Work done by gravity = - 43488J

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