Laws of Motion — Physics STD 11 Science — Question

Tone of open pipe is softer then tune of close pipe, why?

What is specific heat of a gas in an isothermal process?

If the velocity of the center of mass of the particle system is zero, then will the velocities of its various particles necessarily be zero?

If a spherical mirror is dipped in water, does its focal length change?

In a simple linear elastic collision, if a particle collides with a particle of same mass then what is the relationship between the velocities of the particles after the collision?

A LASER is a source of very intense, monochromatic, and unidirectional beam of light. These properties of a laser light can be exploited to measure long distances. The distance of the Moon from the Earth has been already determined very precisely using a laser as a source of light. A laser light beamed at the Moon takes 2.56s to return after reflection at the Moon’s surface. How much is the radius of the lunar orbit around the Earth?

Can a body in linear motion be in equilibrium?

Are inertial and gravitational mass of a body different from one another?

Can temperature on celsius scale and Kelvin scale related?

When you come out of a river after a dip, you feel cold. Explain.