495 - Physics Questions Answers

 A projectile is fired with velocity u at entrance A of a horizontal tunnel of length L and height H. The minimum value of u for which projectile will reach the other end of the tunnel without touching the top of the tunnel is 

Derive the expression or show that:Path independence of line integral of electrostatic field,, conservative nature of electrostatic force.

Concept of pseudo force

A small body of mass m=0.30kg${\displaystyle m=0.30kg}$ starts sliding down from the top of a smooth sphere of radius R=1.00m${\displaystyle R=1.00m}$. The sphere rotates with a constant angular velocity ω=6.0rad/s${\displaystyle \omega =6.0rad/s}$ about a vertical axis passing through its centre. Find the centrifugal force of inertia and the Coriolis force at the moment when the body breaks off the surface of the sphere in the reference frame fixed to the sphere.