1. A 0.3kg ball is traveling toward a wall in the +x direction with a speed of 1
ID: 2096818 • Letter: 1
Question
1. A 0.3kg ball is traveling toward a wall in the +x direction with a speed of 15m/s. It hits the wall and bounces directly back with a speed of 12m/s. What is its change in momentum? 2. In the question above the ball is in contact with the wall for 0.03s a) What is the impulse delivered to the ball? b) What is the average force exerted on the ball by the wall? (Include the direction!) 3. A 3kg and a 5kg block are sliding toward each other on a level, frictionless surface as shown at the right. They collide and stick together after the collision. a) What is their velocity after the collision? (Include the direction, i.e. left or right!) b) How much kinetic energy is lost in the collision, i.e. what is the change in KE? 4. A 3kg and a 5kg block are sliding toward each other on a level, frictionless surface as shown at the right. They collide and after the collision the 3kg block is moving toward the left with a speed of 7m/s. a) What is the velocity of the 5kg block after the collision? (Include the direction, i.e. left or right!) b) What is the total change in KE for the two blocks? 5. Two masses,M1= 2kg and M2= 4kg are compressing a spring (of ? 0 mass) between them and are held that way by a 1. A 0.3kg ball is traveling toward a wall in the +x direction with a speed of 15m/s. It hits the wall and bounces directly back with a speed of 12m/s. What is its change in momentum? 2. In the question above the ball is in contact with the wall for 0.03s a) What is the impulse delivered to the ball? b) What is the average force exerted on the ball by the wall? (Include the direction!) 3. A 3kg and a 5kg block are sliding toward each other on a level, frictionless surface as shown at the right. They collide and stick together after the collision. a) What is their velocity after the collision? (Include the direction, i.e. left or right!) b) How much kinetic energy is lost in the collision, i.e. what is the change in KE? 4. A 3kg and a 5kg block are sliding toward each other on a level, frictionless surface as shown at the right. They collide and after the collision the 3kg block is moving toward the left with a speed of 7m/s. a) What is the velocity of the 5kg block after the collision? (Include the direction, i.e. left or right!) b) What is the total change in KE for the two blocks? 5. Two masses,
M1= 2kg and M2= 4kg are compressing a spring (of ? 0 mass) between them and are held that way by a
Explanation / Answer
1)mv=P
0.3*15=4.5 12*0.3=3.6 4.5-4.6=0.9
2)J=Ft
J=change in momentum
a)0.9
b) 0.9=F*0.03
F=30 N
3) picture missing
4)picture missing
5)a)2v1=4v2 v1=2v2
(1/2)*2v^2+(1/2)4v^2=8
6*v^2=8
v2=(4/3)^1/2
v1=4*[(1/3)^1/2]
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