Mechanical Properties of Fluids — Physics STD 11 Science — Question

Which of the coefficient of static friction, dynamic friction and rolling friction has the maximum value?

Explain why
Atmospheric pressure at a height of about 6km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100km.

A man is standing on top of a building 100m high. He throws two balls vertically, one at t = 0 and other after a time interval (less than 2 seconds). The later ball is thrown at a velocity of half the first. The vertical gap between first and second ball is +15m at t = 2s. The gap is found to remain constant. Calculate the velocity with which the balls were thrown and the exact time interval between their throw.

How much should the speed of an object be increased so that its kinetic energy remains half of the initial kinetic energy?

Plot a graph between the time period (T) for a simple pendulum and its length (l).

Why are mountain roads generally made winding upwards rather than going straight up?

What is the specific heat capacity of a gas in isothermal process?

The following example represent periodic motion :
A swimmer completing one (return) trip from one bank of a river to the other and back.

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

Give the magnitude and direction of the net force acting on.
A high-speed electron in space far from all material objects, and free of electric and magnetic fields.