Gravitation — Physics STD 11 Science — Question

A rectangular brick is kept on a table with a part of its length projecting out. It remains at rest if the length projected is slightly less than half the total length but it falls down if the length projected is slightly more than half the total length. Give reason.

Can the carnot Engine be realized realistically?

When do we say that a floating body is in stable equilibrium?

The number of molecules in a container is doubled. What will be the effect on the rms speed of the molecules?

Read statement below carefully, and state, with reasons, if it is true or false:
The instantaneous acceleration of the point of contact during rolling is zero.

Bodies of larger mass need greater initial effort to put them in motion. Why?

A glass of water has an ice cube floating in water. The water level just touches the rim of the glass. will the water overflow when the ice melts? 

Give a method for the determination of the mass of the moon.

Which type of waves exhibit polarisation?

The density of a rod AB continuously increases from A to B. Is it easier to set it in rotation by clamping it at A and applying a perpendicular force at B or by clamping it at B and applying the force at A?