R P Goyal and S P Tripathi Solutions for Chapter: Work, Energy and Power, Exercise 1: EXERCISE-2(A)

How is horse power related to the S.I. unit of power?

One horse power is equal to :

$\mathrm{kWh}$ is the unit of :

A body, when acted upon by a force of $10 \mathrm{kgf}$, gets displaced by $0.5 \mathrm{m}$. Calculate the work done by the force, when the displacement is at an angle of $60°$ with the force. $\left(g=10 \mathrm{N} {\mathrm{kg}}^{-1}\right)$

A body, when acted upon by a force of $10 \mathrm{kgf}$, gets displaced by $0.5 \mathrm{m}$. Calculate the work done by the force, when the displacement is normal to the force. $\left(g=10 \mathrm{N} {\mathrm{kg}}^{-1}\right)$

A man spends $6.4 \mathrm{kJ}$ energy in displacing a body by $64 \mathrm{m}$ in the direction in which he applies force, in $2.5 \mathrm{s}$. Calculate the power spent (in H.P.) by the man.

A boy of mass $40 \mathrm{kg}$  runs up a flight of $15$ steps each $15 \mathrm{cm}$ high in $10 \mathrm{s}$. Find the work done by the boy? Take$\mathrm{g} = 10 \mathrm{N} \mathrm{kg}{ }^{-1}$

A boy of mass $40 \mathrm{kg}$ runs up a flight of $15$ steps each $15 \mathrm{cm}$ high in $10 \mathrm{s}$. Find the power developed by him in watt?

Take $\mathrm{g} = 10 \mathrm{N} {\mathrm{kg}}^{-1}$