A car weighs 1800 kg. The distance between its front and back axles is 1.8 m. its centre of gravity is 1.05 m behind the front axle. Determine the force exerted by the level ground on each front wheel and each back wheel.

Two spherical balls are charged with 1.2 and 4.8 coulomb of charges. The distance between their centre is 120 cm. Find out the point where the forces neutralise each other.

A persion clapped his hands in front of a wall and heard echo later 1s. If speed of sound m air is 330 m/s, find out the distance between the person and the wall.

A disc of mass 5 kg radius 0.5 m rolls on the ground at the rate of 10 ms^(-1) . Calculate its KE.

The shape of the top surface of a table is a trapezium. Find its area if its parallel sides are 1m and 1.2m and perpendicular distance between then is 0.8 m.

A plane is in level flight at constant speed and each of its two wings has an area of 25 m^2 . If the speed of the air is 180 km/h over the lower wing and 234 km/h over the upper wing surface, determine the plane’s mass. (Take air density to be 1 kg m^-3) .

What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (Mass of the earth is 6 x 10^24 kg and radius of the earth 6.4 x 10^6 m.)

Two masses M_1 and M_2 separated by distance r start moving towards each other due to their own force of attraction. What will be the change in centre of mass?

Two straight wires A and B of lengths 10 m cach carrying currents of 4.0 A and 6.0 A in opposite directions lic parallel to each other at a distance of 2 cm. Estimate the force on a 10 cm section of the wire B near its centre.