Question

Calculate the work need for bird of mass 120 g to fly a height of 50m from the suface of earth

Answer 1

Answer:

Explanation: so w=f.d

                     then, F=m.a

                      since a is known F will be equal to m.a = 0.12kg*10N/Kg=1.2N

                      W = F.d = 1.2N * 50m = 60J or (Nm)

Answer 2

The work done by the bird is 58.8 Joules.

Explanation:

Mass of the bird, m = 120 g = 0.12 kg

It is flying a height of 50 m from the surface of earth. We need to find the work done by the bird. We know that the work done is equal to the product of force and displacement. So,

$W=F\times d\\\\W=m\times g\times d\\\\W=0.12\times 9.8\times 50\\\\W=58.8\ J$

So, the work done by the bird is 58.8 Joules.

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