1) A 2.5kg durian falls from a tree with a height of 30m. Determine the energy before it falls in Joule.
2) A 2.5kg durian falls from a tree with a height of 30m. Determine the velocity when it drops 20m from the ground.
3) A 2.5kg durian falls from a tree with a height of 30m. Determine the velocity when it hits the ground.
4) A billiard ball of mass 120g is moving with a constant velocity of 1.5ms-1. It strikes a smaller ball and is slowed down to 1.1ms-1. What is the change in momentum of the ball?
5) A billiard ball of mass 120g is moving with a constant velocity of 1.5ms-1. It strikes a smaller ball and is slowed down to 1.1ms-1. If the contact time for the collision is 0.16s, what is the average force acting on the large ball by the small ball?
6) A wheel 25.0cm in radius turning at 120rpm increases its frequency to 600rpm in 9.0s. Find the constant angular acceleration in rads-2.
7) A 180kN tensile force is applied to a metal wire of length 2cm and radius 40mm. If it's elongation is 0.05mm, calculate the tensile stress.
1 answer
1 answer