Week 8 Thursday Momentum I From what height can an 80 kg person fall and just survive? Assume that he doesn't bounce on impact and a force of 1.9x105 N acts on him for 0.007 s.
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We need to find the height form which the person can fall. We first find the final velocity just before hitting ground. We are given the force and time of acting. We thus find the change in momentum first. We equate this change in momentum to change in momentum we get by finding velocity.
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- As shown in the figure below, two blocks (m1 and m2) are each released from rest at a height of h = 3.53 m on a frictionless track and when they meet on the horizontal section of the track they undergo an elastic collision. If m1 = 2.50 kg and m2 = 4.15 kg,determine the maximum heights (in m) to which they rise after the collision. Use the coordinate system shown in the figure.23 1Question 1
- complete the following 3 steps. 1. Indicate what your chosen system is (which objects are included in the system?) as well as your initial and final instants. Explain how your choice will help you solve the problem. 2. Draw a momentum-impulse bar chart for your chosen system that is consistent with the information given. 3. Write an equation using the bar chart as a guide and solve for any unknowns. A .06 kg tennis ball hits a wall with a velocity of 30 m/s and rebounds at about the same speed. What is the change in momentum of the ball from before the collision to after?Question 5 Three questions have the same general description. A 2400 kg truck is traveling at 24 m/s and runs into the back of a 1200 kg Mini Cooper. Immediately after the collision, the two cars are stuck together and moving at 22 m/s. What was the average force on the truck if the collision happened in 0.02 seconds? Your answer: O 96 N O 1056 N O 240,000 N O 2,640,000N O 2,880,000Nm₁ The figure shows two carts before a collision; cart m₁ is moving with velocity vo toward cart m₂ at rest. The carts slide without friction on the air track. (A) If the carts stick together when they collide, what will the final velocity be? m2 (B) If the carts collide elastically, what will the final velocity of cart C₂ be? DATA: m₁ = 1.3 kg; m₂ = {inelastic : } (in m/s) 1.7 kg; {elastic: } (in m/s) Vo = 2.5 m/s; OA: 1.083 B: 1.268 OC: 1.483 OD: 1.735 OE: 2.030 OF: 2.375 OG: 2.779 OH: 3.251 A: 1.608x10-¹B: 2.331x10-¹ OC: 3.380x10-¹ OD: 4.901x101 OE: 7.107x10-¹ OF: 1.031 OG: 1.494 OH: 2.167
- 623 4m V Question 3: The diagram below shows two carts moving in opposite directions on a frictionless surface. When the two carts collide they stick together. 6 m/s 1 m/s 4.0 kg 6.0 kg 4.0 Frictionless surface 4 a) Fill in the mvp table below for the collision: 4.0 kg-cart 6.0 kg cart two carts combined Р b) Which cart experiences a greater change of momentum during the collision? c) Which cart experiences a greater impact force during the collision? X.