Classical Mechanics Answers

A 15 g bullet traveling parallel to an inclined ramp strikes a 2.74 kg block of wood and becomes imbedded in it. The impact drives the block a distance of 26 cm up the ramp. The ramp is inclined at 28°, and the coefficient of friction is 0.40. What is the speed of the bullet just before impact?

Mike is on a hunting trip but dosent like to shoot at animals so he places a baseball in a tree right above him. Than shoots a bullet (0.02 kg) at the baseball (0.15 kg). The two objects embed and Rose to a max height of 13.5 meters before coming back down. What was the initial velocity of the bullet?

A 25.0 kg mass moving to the right at 6.00 m/s has a totally inelastic collision with a 9.0 kg mass moving left at 3.5 m/s. a. What is the objects final velocity? b. How much energy was lost during the collision?

A raft is floating down the river at 7 m/s east. The raft has a mass of 120 kg and carries a student with a mass of 60 kg. The student than jumps off the raft to the west at 3 m/s relative to the raft. What is the velocity of the raft after the student jumps?

A child who weighs 325 N stands 5 m from the right end of a 12 m plank. A 150 N load has its center of gravity 4 m from the same end. The plank weighs 110 N. If the plank is supported at its ends, find the force exerted by each support. Show solutions.

A child who weighs 325 N stands 5 m from the right end of a 12 m plank. A 150 N load has its center of gravity 4 m from the same end. The plank weighs 110 N. If the plank is supported at its ends, find the force exerted by each support. Show solutions.

   The diagram shows five different moving objects. Which of the objects are moving at a constant speed? (T5:23)

a) Left Arrow 6N, Right Arrow 10N

b) x2 Right Arrows 4N

c) Left Arrow 5N, Right Arrow 2N, Right Arrow 3N

d) Left Arrow 6N, x2 Right Arrow 6N

e) Left Arrow 3N, Left Arrow 8N, Right Arrow 4N, Right Arrow 6N

7.Police suspect that a van was breaking the speed limit when it collided with a parked car. Investigations provided them with the following data: mass of parked car                  = 800 kg,  mass of van = 1000 kg,  velocity of  car after collision = 5 m/s,  velocity of van after collision = 11 m/s

Show whether the van was breaking the 30 mph speed limit (equivalent to 13 m/s).

8.A dodgem car of mass 200 kg moves with a velocity of 3 m/s. The moving dodgem collides with a stationary one of mass 180 kg.

After the collision, the 200 kg dodgem continues to move in the same direction at a speed of 1 m/s.

Calculate the speed v with which the 180 kg (second) dodgem moves to the right after the collision.

3. A truck of mass 2000kg, moving at 20m/s, collides with a car of mass 1000kg, which is stationary. What is the velocity of the car after the collision if the truck now moves 

forward at 10m/s ?

4.A skater of mass 70 kg is moving at 4 m/s when he bumps into a skater of mass 50 kg who is not moving.  They move off together on the ice.  What is their velocity immediately after the collision?

5.In a game of bowls one particular bowl hits the jack head on causing it to move forward. The jack has a mass of 300 g and was originally stationary.  The bowl has a mass of 1 kg and was moving at a speed of 2 m/s before hitting the jack, but continued forwards at 1.5 m/s after the collision.  What is the speed of the jack after the collision?

6.State Newton’s Third Law