Posted by **Danny** on Tuesday, February 26, 2013 at 10:03am.

One of the most powerful cranes in the

world, operating in Switzerland, can slowly

raise a load of 6000 tonne to a height of 12 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

I found it by using Work = mass* acceleration* distance

1) converted 6000 tones to kilograms and I got 6000000kg thus,

2) work = (6000000kg)*(9.81m/s^2)*(12m)=706320000J

3)Then I converted 706320000j to MJ

706320000/10^6=70632 MJ

002 (part 2 of 2) 5.0 points

If it takes 3 min to lift the load at constant velocity to this height, find the power developed

by the crane.

Answer in units of MW.

please help me I have tried it 3 times and it's wrong. Please explain so I can understand how to go about this problems.

## Answer This Question

## Related Questions

- Physics. PLEASE HELP!! - NOTE: 1 MJ = 106J. One of the most powerful cranes in ...
- Physics matter and its properties - A circular metal column is to support a load...
- Math - Calculate the mass of water in kg and tonne contained in a rectangular ...
- Physics - Hi Can someone check and advise on this potential energy of 2 tonne of...
- physics - The throttle of an electric train is shut off at a speed of 48 km/h. ...
- physics - A truck of mass 1.0 tonne moving at 4.0 m/s catches up and collides ...
- physics - A crane lifts 1 tonne of concrete through a height of 25 m. How much ...
- Maths / physics - Calculate the rest mass (In grams) of an object whose rest ...
- physics - A 1 tonne caravan is being towed by a car which provides a constant ...
- Science - Which one is longer mts (metre-tonne-second) or km (kilometre)?

More Related Questions