Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.

Two children are at opposite ends of an aluminium rod. One strikes the end of rod with a stone. Find the ratio of times taken by sound wave in air and in aluminium to reach the second child (Given: Speed of sound in air =346m//s , Speed of sound in aluminium = 6420m//s) .

The end of the rod which is connected to the spring is pushed down and released. Find time period of oscillation of the rod ?

Two sounds are heard at the end of an iron rod 5 km long at an interval of 14 seconds, when a source of sound is placed at the other end of the rod. The velocity of sound in air is 330 m/s. the velocity of sound in iron is aproximately

The ends of a rod of length l move on two mutually perpendicular lines. Find the locus of the point on the rod which divides it in the ratio 1 : 2.

Assume that the thermal conductivity of copper is twice that of aluminium and four times that of brass. Three metal rods made of copper, aluminium and brass are each 15 cm long and 2 cm in diameter. These rods are placed end to end, with aluminium between the other two. The free ends of the copper and brass rods are maintained at 100^@C and 0^@C respectively. The system is allowed to reach the steady state condition. Assume there is no loss of heat anywhere. When steady state condition is reached everywhere, which of the following statement is true?

In the figure , mass of a ball is 9/5 times mass of the rod, Length of rod is 1m.The level of ball is same as rod level.Find out time taken by the ball to reach at upper end of rod.

Four rods made up of glass, plastic, aluminium, an wood are covered with wax at one end. The other ends of these rods are inserted in a container containing hot water The wax on which rod will melt first?

Two rods, one of iron and the other of aluminium, are heated to the same temperature. Then,