Question

a 52 kg Box rest on the floor much work is required to move it at constant speed (i)12 metre along the floor against the frictional force 150 Newton and(ii) 12 metre vertically upward

Answer 1

Mass of the box = 52 kg

Frictional force = 150 N

Constant force needed to move across the floor = 150 N

Displacement of the box = 12 m

Work done = Force × displacement

i) Work done = 150 × 12 = 1800 Joules

Hence, the work done is 1800 Joules.

ii) Height to which it needed to be raised (h) = 12 m

Acceleration due to gravity = 9.8 m/s^2

Work done against the gravity = mgh

Work done against the gravity = 52 × 9.8 × 12

Work done against gravity = 6115.2 Joules

Answer 2

Answer:

i) 1.8×1000J

ii) 6.9×1000J