Explain why a long pole is more beneficial to the tight rope walker if the pole has slight bending. `(AS_(7))`

The weight of an object is more at the poles than at the equator. Is it beneficial to purchase goods at equator and sell them at the pole? Does it matter whether a spring balance is used or an equal beam balance is used?

Explain why a test tube immersed at a certain angle in a tumbler of water appears to have a mirror suface for a certain viewing position? (AS_(7))

Explain with reason why if ice melts at pole then moment of inertia of earth increases, angular velocity omega decreases and day night will be longer?

A wire attached to a vertical pole of height 18m is 24m long and has a stake attached to the other end. How far from the base of the pole should the stake be driven so that the wire will be taut?

You want to erect a pole of height 10 m with the support of three ropes. Each rope has to make an angle 30^(@) with the pole. What should be the length of the rope?

A circus artist is climbing a 20m long rope, which is tightly stretched and tied from the top of a vertical pole to the ground. Find the height of the pole, if the angle made by the rope with the ground level is 30^(@) ( see figure ).

A long bar magnet has a pole strength of 10 Am . Find the magnetic field at a point on the axis of the magnet at a distance of 5cm from the north pole of the magnet.

Explain the reasons for the following (a) Why dust comes out of carpet when it is beaten with a stick ? (b) Luggage kept on the roof of a bus is tied with a rope. (c ) Why a pace bowler in cricket runs from a long distance before he bowls ?