1. Which object has the highest KE? (provide all answers), state which one. A 3kg ball thrown at 6m/s A 5kg mass moving at 5m/s A 80kg solid tray sliding across a desk at 0.4m/s I. II. III. 2. A 2kg billiard ball moving at 4 m/s to the right hits an 8kg bowling ball originally at rest. The billiard ball then moves in the opposite direction at 2 m/s. The collision is elastic. That is, energy is conserved. What is the velocity of the bowling ball after the collision? 3. A 10 kg block is dragged by an applied force of 20N, which makes an angle of 600 with the horizontal. The coefficient of friction of the surface is u, = 0.25. The block starts from rest and is pulled a distance of 7m. a) Calculate the work done by the applied force? b) Calculate the work done by the force of friction? c) What is the resultant work done? d) What is the final velocity of the block? Recall: work done equals change in kinetic energy 4. 4) On a frictionless surface, a block with mass M1 =0.50 kg moving at 4 m/s to the right collides with a mass M2= 0.20kg block moving to the left at 2m/s. The bodies move along the x-axis only. a) If the two blocks stick together after the collision, what is the final velocity (magnitude and direction? b) How much mechanical energy is lost? c) If the collision lasts for 30ms, find the average force. 5. A 72-kg athlete starts from rest and then sprints on a level track, reaching a final speed of 6.3m/s after 12 seconds. a) Calculate the work done. b) What was her average mechanical power? 6. A spring exerts a force of 100 N when compressed 0.15m. a) Determine the spring constant and calculate how much potential energy is stored in the spring, if it is now compressed 0.20 m? b) The spring compressed 0.20m, is used to launch a 0.6 kg ball horizontally. What is the maximum speed with which the ball can be launched?
1. Which object has the highest KE? (provide all answers), state which one. A 3kg ball thrown at 6m/s A 5kg mass moving at 5m/s A 80kg solid tray sliding across a desk at 0.4m/s I. II. III. 2. A 2kg billiard ball moving at 4 m/s to the right hits an 8kg bowling ball originally at rest. The billiard ball then moves in the opposite direction at 2 m/s. The collision is elastic. That is, energy is conserved. What is the velocity of the bowling ball after the collision? 3. A 10 kg block is dragged by an applied force of 20N, which makes an angle of 600 with the horizontal. The coefficient of friction of the surface is u, = 0.25. The block starts from rest and is pulled a distance of 7m. a) Calculate the work done by the applied force? b) Calculate the work done by the force of friction? c) What is the resultant work done? d) What is the final velocity of the block? Recall: work done equals change in kinetic energy 4. 4) On a frictionless surface, a block with mass M1 =0.50 kg moving at 4 m/s to the right collides with a mass M2= 0.20kg block moving to the left at 2m/s. The bodies move along the x-axis only. a) If the two blocks stick together after the collision, what is the final velocity (magnitude and direction? b) How much mechanical energy is lost? c) If the collision lasts for 30ms, find the average force. 5. A 72-kg athlete starts from rest and then sprints on a level track, reaching a final speed of 6.3m/s after 12 seconds. a) Calculate the work done. b) What was her average mechanical power? 6. A spring exerts a force of 100 N when compressed 0.15m. a) Determine the spring constant and calculate how much potential energy is stored in the spring, if it is now compressed 0.20 m? b) The spring compressed 0.20m, is used to launch a 0.6 kg ball horizontally. What is the maximum speed with which the ball can be launched?
College Physics
11th Edition
ISBN:9781305952300
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Chapter1: Units, Trigonometry. And Vectors
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Transcribed Image Text:1.
Which object has the highest KE? (provide all answers), state which one.
A 3kg ball thrown at 6m/s
A 5kg mass moving at 5m/s
A 80kg solid tray sliding across a desk at 0.4m/s
I.
II.
III.
2. A 2kg billiard ball moving at 4 m/s to the right hits an 8kg bowling ball
originally at rest. The billiard ball then moves in the opposite direction at
2 m/s.
The collision is elastic. That is, energy is conserved. What is the velocity of
the bowling ball after the collision?
3. A 10 kg block is dragged by an applied force of 20N, which makes an angle of
600 with the horizontal. The coefficient of friction of the surface is u, = 0.25.
The block starts from rest and is pulled a distance of 7m.
a) Calculate the work done by the applied force?
b) Calculate the work done by the force of friction?
c) What is the resultant work done?
d) What is the final velocity of the block?
Recall: work done equals change in kinetic energy
4. 4) On a frictionless surface, a block with mass M1 =0.50 kg moving at 4 m/s to
the right collides with a mass M2= 0.20kg block moving to the left at 2m/s.
The bodies move along the x-axis only.
a) If the two blocks stick together after the collision, what is the final velocity
(magnitude and direction?
b) How much mechanical energy is lost?
c) If the collision lasts for 30ms, find the average force.
5. A 72-kg athlete starts from rest and then sprints on a level track, reaching a
final speed of 6.3m/s after 12 seconds.
a) Calculate the work done. b) What was her average mechanical power?
6. A spring exerts a force of 100 N when compressed 0.15m.
a) Determine the spring constant and calculate how much potential energy is
stored in the spring, if it is now compressed 0.20 m?
b) The spring compressed 0.20m, is used to launch a 0.6 kg ball horizontally.
What is the maximum speed with which the ball can be launched?
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