A P Shreelatha and Neetu Singh Solutions for Chapter: Work and Energy, Exercise 2: TEST YOURSELF

How is the work done by a force measured?

Write the formula for work done on a body when it moves at an angle of '$\theta$' to the direction of force applied. State the meaning of each symbol used.

A boy weighing $40 \mathrm{kg}$ climbs up a tree of height $5 \mathrm{m}$. Calculate the amount of work done ($g = 9.8 \raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s^2$}\right.$).

Calculate the work done by a man holding a suitcase weighing $5 \mathrm{kg}$ in his hand.

A force of $500 \mathrm{N}$ moves a body through a distance of $100 \mathrm{cm}$. Calculate the work done by the force.

Calculate the work done if a force of $1000 \mathrm{N}$ causes a displacement of $45 \mathrm{m}$ such that the force makes an angle of $60°$ with the displacement.

A man does a work of $5 \mathrm{kJ}$ in lifting a $20 \mathrm{kg}$ bucket from ground floor to the top floor of the building. Calculate the height of the building. Take $g= 9.8 \mathrm{m}/{\mathrm{s}}^2$.