Question

A weight lifter lifts a 1.0 x 103 N weight 1.5 m in 2.0 s. The power is?
a. 5.0 x 102 W b. 6.7 x 102 W c. 7.5 x 102 W d. 1.5 x 103 W

Answer 1

Answer:

750W

Explanation:

Given parameters:

Weight = 1 x 10³N = 1000N

Distance  = 1.5m

Time  = 2s

Unknown:

Power = ?

Solution:

Power is the rate at which work is done

  Work is the force applied on a body to move it through a particular distance

         Work = force x distance

            Power = $\frac{work}{time}$

Now, work = 1000 x 1.5 = 1500J

So;

     Power  = $\frac{1500}{2}$   = 750W