Why is the diameter of an iron tyre kept slightly smaller than the wooden wheel on which this tyre is to be mounted? Explain.

An iron tyre is to be fitted onto a wooden wheel 1.0 m in diameter. The diameter of the tyre is 6 mm smaller than that of wheel the tyre should be heated so that its temperature increases by a minimum of (coefficient of volume expansion of iron is 3.6xx10^-5//^@C )

Statements given below are incorrect. Write the correct statements. An iron rim of a slightly smaller diameter than a wooden wheel is cooled so that it easily slips over wooden wheel.

Iron tyres are mounted on the wooden wheels of a tonga. Initially the diameter of the iron tyre is:

Assertion : In optical fibre, the diameter of the core is kept small. Reason : This smaller diameter of the core ensures that the fibre should have incident angle more than the critical angle required for total internal reflection.

Iron rims are heated before they are fixed on the wooden wheels. Explain the reason.

An iron tyre of diameter 2 m is to be fitted on to a wooden wheel of diameter 2.01 m. The temperature to which the tyre must be heated , if alpha=11xx10^(-6).^@C^(-1) and room temperature is 20^@C , will be

Why are electric transmission lines kept slightly loose, when they are laid in summer? Explain.

A cylindrical steel plug is inserted into a circular hole of diameter 2.60 cm in a brass plate. When the plug and the plates are at a temperature of 20^(@)C, the diameter of the plug is 0.010 cm smaller than that of the hole. The temperature at which the plug will just fit in it is ("Given",alpha_(steel)=11xx10^(-6)C^(-1)and alpha_(brass)=19xx10^(-6)C^(-1)

Two rings are suspended from the points A and B on the ceiling of a room with the help of strings of length 1.2 m each as shown. The points A and B are separated from each other by a distance AB = 1.2 m. A boy standing on the floor throws a small ball so that it passes through the two rings whose diameter is slightly greater than the ball. At the moment when the boy throws the ball, his hand is at a height of 1.0 m above the floor. A stop watch which is switched on at the moment of throwing the ball reads 0.2 s when the ball passes through the first ring and 0.6 s when it passes through the second ring. The maximum height attained by the ball above the floor is:

Two rings are suspended from the points A and B on the ceiling of a room with the help of strings of length 1.2 m each as shown. The points A and B are separated from each other by a distance AB = 1.2 m. A boy standing on the floor throws a small ball so that it passes through the two rings whose diameter is slightly greater than the ball. At the moment when the boy throws the ball, his hand is at a height of 1.0 m above the floor. A stop watch which is switched on at the moment of throwing the ball reads 0.2 s when the ball passes through the first ring and 0.6 s when it passes through the second ring. The angle of projection of the ball is: