Mechanics | Relativity Answers

A golf ball has a mass of .046 grams and when struck by a driver reaches a speed of 42 m/s. The club is in contact with the ball for the time of .50 millisecond. If the momentum of the ball just after the impact is 1.9 m/s, what is the average force of the club on the ball?

A projectile is fired at an upward angle of 45° from the top of a 233 m cliff with a speed of 192 m/s. What will be its speed when it strikes the ground below?

A bullet having a mass of 0.005 kg is moving with speed of 100 m/s .it penetrates into a bag of sand and brought to rest after moving 25 cm into the bag . Find the decelerating force on the bullet . Also calculate the time in which it is brought to rest.

a bucket of water of mass 10kg is raised from rest through a height of 10m and placed on a platform.how much does it potential energy increase?what was the work done against gravity?

a bucket of water of mass 100metric tons accelerates from rest to a stop at 72 km/h on a horizontal track. calculate the work done by the locomotive engine neglecting friction

a certain athlete consistently throws a javelin at a speed 25m/s.what is her best distance?on one occasion the athlete released the javelin poorly,and achieved only one half of his distance.at what elevation angle did she release the javelin

A transport airplane flies horizontally with a constants velocity of 600km/h,at a height of 2km.directly over a marker it releases an empty fuel tank.How far ahead of the marker does the tank hit the ground?at this time,is the airplane ahead or behind the tank?

A roller coaster is initially at a height of 40 m above the ground and has an initial velocity of 15 m/s. Using conservation of energy, find the velocity of the roller coaster at a height of 5 m above the ground.

An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the average power in watts he expends climbing the hill?

A stone is dropped from rest into a well.It is observed to hit the water after 2s.Find the distance down to the water surface.How fast must the stone be thrown downwards in order to hit the surface after only 1s?what are the impact velocities in the two cases?