Question

A man tries to lift a mass 200 kg with a force 100 N.

a) Is he doing work ? Explain.

b) If it is lifted to 2m in 10 sec, find his power?​

Answer 1

Answer:

The Heart of a Tree Summary of the Poem

In this poem, the poet beautifully describes the actual essence of what a person plants when he plants a tree. The poet aptly says that when somebody plants a tree, he plants not only what we call a tree, but something that serves as a friend of sun, sky, and breeze.

Answer 2

Answer:

b) So the Man can’t lift the mass and hence no work is done. or W = 0

(c) Here F = Mg = 19620 N

The work done to lift the mass 2m above the ground

= W = F . d =19620 . 2m= 39240 J

We know that Power = P = W/t 39620/10 =3962 watts. (given t = 10 secs