Thermal Properties of Matter — Physics STD 11 Science — Question

Find the surface energy of water kept in a cylindrical vessel of radius 6.0cm. Surface tension of water = 0.075J/m².

Why is it difficult some times to recognise your friends voice on phone?

Fill in the blanks:
The relative density of lead is 11.3. Its density is ....g cm^-3 or ....kg m^-3.

Two blocks of masses 10kg and 20kg moving at speeds of 10ms^-1 and 20ms^-1 respectively in opposite directions, approach each other and collide. If the collision is completely inelastic, find the thermal energy developed in the process.

Draw velocity-time graph for an object, starting from rest. Acceleration is constant and remains positive.

Do the force of friction and other contact forces arise due to gravitational attraction? If not, then what is the origin of these forces?

What does speedometer record: the average speed or the instantaneous speed?

What is the angle between the equatorial plane and the orbital plane of Polar satel lite?

Why does a gas get heated on compression?