After a 0.390-kg rubber ball is dropped from a height of 1.70 m, it bounces off a concrete floor and rebounds to a height of 1.55 m. • a) Determine the magnitude and direction of the impulse delivered to the ball by the floor. • b) Estimate the time the ball is in contact with the floor to be 0.07 seconds. Calculate the average force the floor exerts on the ball.

Two billiard balls collide in an elastic collision. Which statement about total energy and momentumof the two balls is true?a) both the energy and momentum of the system are conservedb) neither the energy nor momentum of the system are conservedc) the energy of the system is conserved, but the momentum is notd) the momentum of the system is conserved, but the energy is not

47. Ophthalmologists use the properties of inelastic collisions to detect a disease of the eye called glaucoma. While a healthy eye at normal pressure is slightly spongy, glaucoma causes the eye to become rigid due to a buildup of pressure in the eye. An ocular tonometer helps test for glaucoma by sending a puff of air to collide with the eye and measuring its rebound velocity. How would the impulse delivered to the puff of air against a healthy eye compare to an eye with glaucoma?A. The impulse delivered to the air puff by the healthy eye would be greater due to the higher rebound velocity of the air puff. B. The impulse delivered to the air puff by the glaucoma eye would be greater due to the higher rebound velocity of the air puff. C. The impulse delivered to the air puff by the healthy eye would be greater due to the lower rebound velocity of the air puff. D. The impulse delivered to the air puff by the glaucoma eye would be greater due to the lower rebound velocity of the air…

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9. An athlete who is initially at rest in a squatted position jumps vertically upward and then lands going back to the original squatted position (ending at rest with the same center of mass height as at the start). The time period under consideration begins just before the athlete starts the upward motion and ends just after she has landed and comes to rest back in the squatted position. Compare the magnitude and directions of the impulse from the force of the ground on the athlete to the impulse from gravity on the athlete during this time period. Note: there are no other significant forces other than the ground and gravity acting on the athlete during this time period. of

When a truck drives into a haystack, it doesn’t get damaged. When it drives into a concrete wall, there is a lot of damage. Both cases have the same initial speed for the truck and the same final speed as well. What is the difference between these two cases? A) The initial momentum is less when it strikes the haystack.B) The impulse is less when striking the haystack C) The change in momentum is less when striking the haystackD) Force of impact is less when striking the haystack   If you want to hit a volleyball without making it spin, you must apply a force A) Acting below the center of mass B) Acting above the center of massC) Acting through the center of massD) It is impossible to not make it spin

A 71.1-kg basketball player jumps vertically and leaves the floor with a velocity of 1.87 m/s upward. (a) What impulse does the player experience? magnitude N.S direction ---Select- (b) What force does the floor exert on the player before the jump? magnitude direction ---Select- (c) What is the total average force exerted by the floor on the player if the player is in contact with the floor for 0.450 s during the jump? magnitude direction ---Select--