Other Physics Answers

A car carrying a driver and a front-seat passenger of mass 60 kg initially is moving with a speed 18 m/s. The car is then slowed down to rest by an air bag in a time period of 0.4 s. Find the average force in N on the front-seat passenger during this time period. First calculate the impulse and then the average force. Do not use a comma to separate every three-digits.

There are two ice skaters with mass 80 kg and 32 kg at rest on ice initially. When one of them (heavier skater) pushes off against the other (lighter skater), and the heavier skater starts to move with a speed of 3 m/s. What is the speed of the lighter skater in m/s? Note that the distinguish the positive direction from the negative direction, and the heavier skater moves in the positive direction.

During a time period of 0.04 s, a force of average strength of 300 N is applied. How much is the change in momentum of the ball in kg m/s. First calculate the impulse and then the change in momentum.

A railroad car with a mass of 12,000 kg collides with another with a mass of 20,000 kg that is at rest initially and they couple after the collision. If the car that comes to collide initially has a speed of 12 m/s, what is their speed together after the collision in m/s.

An astronaut drops a feather from 1.2m above the surface of the moon. If the acceleration of gravity on the moon is 1.62m/s2 downward how long does it take the feather to hit the moon’s surface?

Find the force necessary to keep the toy car in equilibrium. The mass of the toy is 5kg and the inclination of the plane is 30°. Friction is neglected.

A force of 20N pulls two carts tied together with a string. The carts with masses 3kg and 4kg, respectively, run on a smooth level surface. Find :

a. The acceleration of the 4kg cart

b. The acceleration of the 3kg cart

c. The tension on the string connecting the two carts.

A piece of stone is attached to one end of spring is whirled round in a horizontal circle of radius 7m when the constant speed of the stone is 40ms-1 calculate the centripetal acceleration

A ball is projected vertically upward from the top of a tower 60m high with a velocity if 30ms.what is the maximum height above the ground level? How long does it take to reach the ground

A piece of stone attached to one end of spring is whirled round in a horizontal circle of radius 7m .when the constant speed of the stone is 40ms-1 calculate the centripetal acceleration