Question

A powerlifter of mass 80 kg tries to lift a body of mass 100kg with a force of 500N
a) can he lift the body?
b)if not, what minimum force is required to lift it
c) calculate the work done to lift the body through a distance of 10m
d) if he is capable to lift a mass of 250kg to the top of a building 5m high, in 20 s, find his power

Answer 1

Answer:

i don't know sry sry sry sry sry sry

Answer 2

Given:

Mass of the man = 80 kg

Mass of the body = 100 kg

Force applied on the body = 500 N

To Find:

a) can he lift the body?

b)if not, what minimum force is required to lift it

c) calculate the work done to lift the body through a distance of 10m

d) if he is capable to lift a mass of 250kg to the top of a building 5m high, in 20 s, find his power

Solution:

This problem on weights can be solved very easily using this simple approach.

Weight of the body = 100 × g = 100 × 10 = 1000 N

g = acceleration due to  gravity = 10 m/s²

a.) Now the weight of the body is greater than the force applied.( 1000 > 500 )

So he can't lift the body.

b.) Minimum force required to lift the weight must be 1000 N.

c.) Keeping the force applied to be 1000 N.

distance travelled  = 10 m

Work done to lift the body through a distance of 10 m = Force × displacement = 1000 × 10 = 10,000 J = 10  KJ

Work done to lift the body through a distance of 10 m is 10 KJ.

d.) Mass of the body = m =250 kg

Force applied on the body = F = mg = 250  × 10 = 2500 N

Distance travelled = s = 5 m

Time taken = t = 20 s

⇒ power  = ( Force × Distance )/ Time

⇒ power P = ( 2500 × 5 )/20 = 625

Therefore the power required to lift the body of 250 kg mass is 625 Watt.

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