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- 1. What are the equations for linear momentump and kinetic energy K? Please define the variables. 2. Please define concisely and in your own words the concept of conservation. Describe conservation of momentum and kinetic energy. 3. Briefly describe the difference between elastic and inelastic collisions and give an example of each. Describe these collisions in terms of the kinetic energy and momentum. 4. A moving object collides with and sticks to a stationary object. Do the combined objects move slower, faster or at the same speed as the original moving object? 5. What is the expected value of the ratio of the final and initial momenta, pf/p; ?Block A with a mass of 2kg is moving to the right at 5m/s. It collides with block B with a mass of 3kg moving at 1m/s to the left. A. What is the total momentum before collision? magnitude: direction: B. What is the total momentum after collision? magnitude: direction: C. If collision is perfectly inelastic, what is their velocity after collision? magnitude: direction: D. If block A stops moving, what is the velocity of block B? magnitude: direction: E. What is the coefficient of restitution if block A stops moving after collision with block B?5. Suppose an object is moving in the air. It has a kinetic energy of 273 J and a momentum of 25.2 Kg-m/s at a particular instant. At this instant, a. What is the speed of an object? b. What is the mass of the object?
- a. Explain the Law of Conservation of Momentum. b. Identify the factors that affect the magnitude of momentum.1. A man carries a load of 500 N to a distance of 100 m. The work done by him is B. 50,000 Nm A 5N C.O D. 1/5 N 2. Power is a measure of the A rate of change of momentum C. change of energy B. force which produces motion D. rate of change of energy 3. When angle between force and displacement is 90° then work done is B. 1J C. 10J D. 50 J A.OJ 4. How much power is needed to lift a 49 kg person a vertical distance of 5.0 m in 20.0s ? A 12.5 W C. 120 W B. 210 W D. 25 W 5. Greg applies a force of 100 N to move a box 5 meters. How much work did he do? A. 100 J C. 500 J B. 5J D. 500 N11. What is the momentumn of a 1000 kg car moving northward at 20 m/s? A. 20000N B. 20000J C. 20000 kg*m/s D. 20000 kg*m/s North 12. What is momentum? Mass in motion The size of an object C. The velocity of an object D. A comparison between two objects A. В. 13. Which of the following is the equation to calculate momentum? C. p- mgh D. p-mg A. p=mv В. p= ½mv2 14. What is the constant variablein any collision (crash)? C. Total velocity D. Energy A. Total momentum В. Total speed 15. A 0.250 kg cart moving at 0.400 m/s has how much momentum? 0.1 kg-m/s 1 kg-m/s C. 10 kg-m/s D. 100 kg-m/s A. В.
- I'm trying to understand the different types of energies. I understand the definitions, but when I apply them to situations, it doesn't make much sense to me. I have the following: A. Entrophy - measure of the amt of disorder, or randomness in a system B. Kinetic Energy - Energy in Motion C. Heat - kinetic energy contained in the random motion of atoms & molecules D. Chemical Energy - type of potential energy which arises from the arrangement of atoms and be release in chemical reactions E. Conservation of Energy: Kinetic to Potential Energy - its not possible to destroy or create energy F. Conservation of Energy: Potential to Kinetic G. Potential Energy - Energy an object has because of its location or structure When I try to apply to the following, I come up with this: A: A Glass falls off the shelf & breaks B. An orange falling from a tree C. During exercise you get extremely hot. D Animals consume food (organic molecules) to make ATP to walk, breathe, etc. E. A large…4. A golf ball of mass 50 grams is struck and has a velocity of 70 m/s when it leaves the tee. The golf ball then hits a fence and comes to a stop in 0.02 seconds.a. What is the kinetic energy of the ball as it comes off the tee?b. What is the momentum of the ball as it comes off the tee?c. What is the stopping force acting on the ball?1. Explain your answers to the following: a. Can the velocity change without changing the acceleration? b. Can the kinetic energy be constant if an object is accelerating? c. Can the momentum change without changing the kinetic energy?
- 1. Which of the following is not true about momentum? A. It has direction B. It is conserved in a sytem C. It depends on mass and velocity D. It is the same as the energy of a body. 2. A heavy truck has more momentum than a passenger car moving at the same speed because the truck_______________. A. has greater mass B. has greater speed C. has lesser mass D. has lesser velocity 3. How can you increase your momentum as you run? A. By sitting down B. By running faster C. By slowing down D. By stopping suddenly 4. Which of the following is true about the impulse acting on a body and its change in momentum? A. Impulse is equal to change in momentum. B. Impulse is less than the change in momentum. C. Impulse is greater than the change in momentum. D. There is no relation between impulse and change in momentum.i. Draw the balls and the approximate momentum vectors before and after the collision. ii. What is the final velocity of the second ball, v'2? iii. Is the collision elastic? What is the energy loss in the collision?1. If two particles have equal kinetic energies, are their momenta necessarily equal? Explain. 2. If two particles have equal momenta, are their kinetic energies necessarily equal? Explain. 3. An isolated system is initially at rest. Is it possible for parts of the system to be in motion at some later time? If so, explain how this might occur. 4. If two objects collide and one is initially at rest, is it possible for both to be at rest after the collision? Is it possible for one to be at rest after the collision? Explain. 5. Is it possible to have a collision in which all of the kinetic energy is lost? If so, cite an example. 6. Consider a perfectly inelastic collision between a car and a large truck. Which vehicle loses more kinetic energy as a result of the collision? 7. A piece of mud is thrown against a brick wall and sticks to the wall. What happens to the momentum of the mud? Is momentum conserved? Explain.