Nobody is perfectly ________ or perfectly ___.

The absorption power of a perfectly perfectly black body is :

The collision between two hydrogen atoms is perfectly elastic ,so the momentum is consered.Do you agree with this statement?

Which of the following is not an examp[le of perfectly inelastic collision?

A throwing mud on the wall is one of the examples of a perfectly inelastic collision .Explain.

What is coefficient of restitution? What is its value for perfectly elastic and inelastic collisions?

A cylinder of mass 10 kg and radius 15 cm is rolling perfectly on a plane of inclination 30^@ . The co-efficient of static friction mus = 0.25 :- If the inclination theta of the plane is increased, at what value of theta does the cylinder begin to skid, and not roll perfectly ?

Read each statement below carefully, and state, with reasons, if it is true or false :- A wheel moving down a perfectly frictionless inclined plane will undergo slipping (not rolling) motion.