Rajan exerts a force of 150 N in pulling a cart at a constant speed of 10 m/s. Calculate the power exerted.
A nut is opened by a wrench of length 20 cm. If the least force required is 2 N, find the moment of force needed to loosen the nut.
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
i) Define equilibrium
ii) In a beam balance when the beam is balanced in a horizontal position, it is in which equilibrium state?Give the expression for mechanical advantage of an inclined plane in terms of the length of an inclined plane.
Draw a simplified diagram of a lemon crusher, indicating the direction of load and effort.
The speed of light in glass is 2 × 105 km/s. What is the refractive index of the glass?