Wind velocity is due to difference of …….. .

The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the ……….

Give mode of heat transfer due to density difference.

Assertion:- Different colours of light have same velocity in vaccum, but they have differnet velocites in any other transparent medium. Reason:- For different colours, refractive index of transparent medium has different values.

The second's hand of a watch has length 6 cm. Speed of end point and magnitude of difference of velocities at two perpendicular positions will be

When you are standstill holding a flag, the flag flutters in the direction of wind. When you start running the direction of fluttering of the flag changes to the direction of the wind relative to you. In all case a flag flutters in the direction of the wind relative to the flag. Holding a flag, when you run at 8 m/s due cast, the flag flutters in the north and when you run at 2m/s due south, the flag flutters in the northeast. If the wind velocity is unifoem and remain constant, find the wind velocity.

When you are standstill holding a flag, the flag flutters in the direction of wind. When you start running the direction of fluttering of the flag changes to the direction of the wind relative to you. In all case a flag flutters in the direction of the wind relative to the flag. Winds is blowing uniformly due north everywhere with velocity 12 m/s. A car mounted with a flag starts running towards cast. after 9s from starts the flag flutters in 53^(@) north of west and after 16 s from the start the flag flutters in 37^(@) north of west. (a) Find velocity of the car 9 s after it starts. (b) Find velocity of the car 16 s after it starts. (c) If the car maintains uniform acceleration, find acceleration of the car.

Which of the following exploits energy due to temperature difference at surface water and water at depth ?

A boat has a velocity 4m//s towards east with respect to river is flowing north with velocity 2m//s Wind is blowing towards north with velocity 6m//s . The direction of the flag blown over by the wind hoisted on the boat is :