A disc has a moment of inertia of 0.3 kg m2 and an angular velocity of 4 rad/s. How much torque needed to increase the angular velocity to 6.5 rad/s in a time interval of 3 s.

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

grav forces affect all objects magnetic forces affect magnetic objects and electric currents