Question Answers

Sahay Sir > Question Answers > NCERT Exemplar Class 11 > Physics > Chapter 4 - Laws of Motion > A 70kg man stands in contact against the inner wall of a hollow cylindrical drum of radius 3m rotating about its vertical axis. The coefficient of friction between the wall and his clothing is 0.15 . What is the minimum rotational speed of the cylinder to enable the man to remain stuck to the wall (without falling) when the floor is suddenly removed?

A 70kg man stands in contact against the inner wall of a hollow cylindrical drum of radius 3m rotating about its vertical axis. The coefficient of friction between the wall and his clothing is 0.15 . What is the minimum rotational speed of the cylinder to enable the man to remain stuck to the wall (without falling) when the floor is suddenly removed?

A shell of mass 0.020kg is fired by a gun of mass 100kg. If the muzzle speed of the shell is 80m/s. what is the recoil speed of the gun?