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Posted by 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!! - , 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!! - , 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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