Embibe Experts Solutions for Chapter: Work, Energy and Power, Exercise 1: COMEDK UGET 2014

The diagram shows a barrel of weight $1.0\times {10}^3 \mathrm{N}$ on a frictionless slope inclined at $30°$ to the horizontal.

The force is parallel to the slope. Whet is the work done in moving the barrel a distance of $5.0 \mathrm{m}$ up the slope?

A $2 \mathrm{kg}$ mass lying on a table is displaced in the horizontal direction through $50$ $\mathrm{cm}.$ The work done by the normal reaction will be

A pump on the ground floor of a building can pump up water to fill the tank of $30 {\mathrm{m}}^3$ in $15$ min. If the tank is $40 m$ above the ground, and the efficiency of the pump is $30\%,$ the power consumed by the pump is $\left(\mathrm{g}=10 \mathrm{m}/{\mathrm{s}}^2\right)$