Answer:
a)110 N (assuming g = 10 m/s2 )
b) 16500 J
c) ≅ 11.96 W
Explanation:
a) 150 m is not enough to a sensible change of gravitational acceleration at that level from Earth's surface. Therefore, backback weight is same as when it is in ground level.
W = mg, W = weight of object ; m = mass of the object ; g = gravitational acceleration felt by object.
By substituting,
W = 11×10 = 110 N (assuming g = 10 m/s2 )
b) Work done = Energy change
Work done by lifting the bag = Potential energy change
= mgh ; h = Vertical height lifted
= 11×150×10 (assuming g = 10 m/s2 )
= 16500 J
c) Power = Work done/ time taken
= 16500/(23×60) (minutes converted to seconds by multiplying by 60)
≅ 11.96 W
