Posted by **Ashley** on Monday, March 26, 2012 at 1:22pm.

NOTE: 1 MJ = 106J.

One of the most powerful cranes in the

world, operating in Switzerland, can slowly

raise a load of 6000 tonne to a height of 8 m.

(1 tonne = 1000 kg)

The acceleration of gravity is 9.81 m/s2 .

How much work is done by the crane?

Answer in units of MJ

- Physics. PLEASE HELP!! -
**Steve**, Monday, March 26, 2012 at 2:42pm
work = force * distance

= 6000 * 1000kg * 9.81 * 8

= 470.88 * 10^6 J

= 471.88 MJ

- Physics. PLEASE HELP!! -
**Elena**, Monday, March 26, 2012 at 2:42pm
Since the load moves at constant speed the force applied by the engine is equal to the gravity force. Therefore, the work is

W=F•h = m•g•h =6•10^6•9.8•8=

= 4.71•10^8 J=471 MJ

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