Short Answer TypeExplain the motion of a planet around the sun in a circular orbit.
A planet moves around the sun in a circular path for which the gravitational force of attraction on the planet by the sun provides the necessary centripetal force. This centripetal force is always directed towards the centre of the sun at each point of its path which is responsible for the circular motion of a planet.
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?
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