Question

15. A machine raises a load of 750 N through a height of 16 m in 5 s. Calculate:(ii) the power of the machine if it is 100% efficient.

Answer 1

Answer:

Explanation: Power = Work/time

P = mgh/t

P = (750×16)/5

P = 2400

Answer 2

Question:

A machine raises a load of 750 N through a height of 16 m in 5 s. Calculate 1. Energy spent by the machine 2. Power of the machine if it is 100 % efficient.

Answer:

12000 J

2400 W

Explanation:

Force = 750 N

Height = 16 m

Time = 5 sec

Energy = mgh (Force × Height)

Energy = 750 × 16

Energy = 12000 J

Power = Energy/Time

Power = 12000/5

Power = 2400 W