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1) A machine does 4000 J of work in accelerating a 20 kg object, intially at rest, at 3.0 m/s2 for 5.0s determine

a) The efficiency of the machine

b) The power output of the machine

2)A block and tackle is used to raise a 100kg load. If the maximum applied force is 220N, how many strands of rope must support the moveable block?

3)A wrench is used to turn a bolt of 6.0mm diameter. The centre of the bolt head is 0.2m from the applied force.

a) what is the IMA of this machine?

b) If the efficiency is 50%, what is the AMA of the machine?

4) A ramp is 12m in length and has a grade of 25%

a)If friction is neglected, what force is required to push a 120-kg box up the ramp?

b) If the actual force required is 490 N, determine the efficiency of the ramp.

If someone could help me it would be awesome!

Nikki196