R P Goyal and S P Tripathi Solutions for Chapter: Machines, Exercise 2: EXERCISE-3(B)

A box of mass $30 \mathrm{kg}$ is to be raised from ground to a platform at P. A boy A does it by pushing the box along the slope QP of length$\mathrm{x}$, while another boy B does it by using the slope RP of length$\mathrm{y}$. Ignoring the force of friction, compare the effort applied by the boys A and B.

A box of mass $30 \mathrm{kg}$ is to be raised from ground to a platform at P.  A boy A does it by pushing the box along the slope QP of length$x$, while another boy B does it by using the slope RP of length$y$. Ignoring the force of friction, compare the work done by the boys A and B. 

A gear system has one wheel with 10 teeth and the other wheel with 50 teeth. Calculate the acquired speed and the acquired torque that you can obtain using them. What will be the gear ratio in each case?

A gear system has the driving wheel of radius 2 cm and driven wheel of radius 20 cm. Find the gear ratio.

A gear system has the driving wheel of radius 2 cm and driven wheel of radius 20 cm. If the number of rotations made per minute by the driving wheel is 100, find the number of rotations per minute made by the driven wheel.

A gear system has the driving wheel of radius $2 \mathrm{cm}$ and driven wheel of radius $20 \mathrm{cm}$. If the driven wheel has$40$ teeth, find the number of teeth in the driving wheel. Given ${\mathrm{n}}_{\mathrm{A}=}100$.

The driving wheel of a gear system is of radius $1 \mathrm{cm}$ and it has $8$ teeth. For twelve rotations of the driving wheel, if the driven wheel makes one rotation then find the radius of the driven wheel.

The driving wheel of a gear system is of radius 1 cm and having 8 teeth. For twelve rotations of the driving wheel, if the driven wheel makes one rotation find the number of teeth in the driven wheel.