If the momentum of a pair of point objects is equal to zero, must the kinetic energy of those objects also be zero?
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If the momentum of a pair of point objects is equal to zero, must the kinetic energy of those objects
also be zero?
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- A ball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. If the ball hits the floor with a speed of 2.80 m/s and rebounds with a speed of 1.60 m/s, determine the following. (a) magnitude of the change in the ball's momentum in kg • m/s (Let up be in the positive direction.) kg • m/s (b) change in the magnitude of the ball's momentum in kg • m/s (Let negative values indicate a decrease in magnitude.) kg • m/s (c) Which of the two quantities calculated in parts (a) and (b) is more directly related to the net force acting on the ball during its collision with the floor? O the magnitude of the change in the ball's momentum O the change in the magnitude of the ball's momentum Neither are related to the net force acting on the ball. O They both are equally related to the net force acting on the ball.A blob of clay and a tennis ball are thrown at a partially open door in order to try to close it. Both have the same mass. The blob of clay sticks to the door while the tennis ball bounces off. Which one will be more likely to close the door or will they both close the door by the same amount?) 1. A system consists of a 2-kg object moving to the left at 6.0 m/s, and a 3.0 kg object moving to the right at 4.0 m/s. Which of the following statements in true? The total kinetic energy of the system is nonzero, and the total momentum of the system is zero The total kinetic energy of the system is zero, and the total momentum of the system is nonzero. The total momentum and total kinetic energy of the system are both zero The total momentum and total kinetic energy of the system are both nonzero
- Is the following statement true? If not, why? Within the system, both the momentum and kinetic energy are conserved during each of the collisions ( spring-loaded elastic, hoop spring, and putty collisions).True or False: Both the total Energy and the total Momentum of a closed system are both always conserved.Particle A has mass m and moves directly to the right with speed v > 0. Particle B has one fourth the mass of Particle A and moves directly to the right with twice the speed of Particle A. Which of the following statements are true? (Pick two.) Particle A has greater momentum than Particle B. Particle B has greater momentum than Particle A. Both particles have the same momentum. Particle A has greater kinetic energy than Particle B. Particle B has greater kinetic energy than Particle A. Both particles have the same kinetic energy.
- A railroad car of mass 2.56 x 104 kg is moving with a speed of 4.10 m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.05 m/s. (a) What is the speed of the four cars after the collision? (Round your answer to at least two decimal places.) m/s (b) How much mechanical energy is lost in the collision?Doing some physics homework and am kind of stumped here!