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- Use the impulse-momentum equation to answer questions: 1) Why is it important to “follow through" when trying to hit a home run? 2) Why does it hurt more when you fall on a concrete floor than on a wooden floor? 3) What is the momentum of a golf ball with a mass of 62 g moving at 73 m/s? 4) If in the problem above, the impact between the ball and club lasted for a. 2.0 x 103 s, what force acted on the ball? What force acted on the club? 5) For how long a time must a tow truck pull with a force of 550 N on a stalled 1200 kg car to give it a forward velocity of 2.0 m/s?A 0.279-kg volleyball approaches a player horizontally with a speed of 12.4 m/s. The player strikes the ball with her fist and causes the ball to move in the opposite direction with a speed of 21.1 m/s. (a) What impulse is delivered to the ball by the player? (Take the direction of final velocity to be the positive direction. Indicate the direction with the sign of your answer.) (b) If the player's fist is in contact with the ball for 0.0600 s, find the magnitude of the average force exerted on the player's fist.19. IP A 0.14-kg baseball moves toward home plate with a ve- locity V₁ = (-36 m/s)x. After striking the bat, the ball moves vertically upward with a velocity v = (18 m/s)ŷ. (a) Find the direction and magnitude of the impulse delivered to the ball by the bat. Assume that the ball and bat are in contact for 1.5 ms. (b) How would your answer to part (a) change if the mass of the ball were doubled? (c) How would your answer to part (a) change if the mass of the bat were doubled instead?
- A careless driver driving at 25 m/s hit a tree while fumbling with his phone. Assume the driver was in contact with the air bag for 0.22 seconds, and his upper body has 37 kg in mass, then how much average force (absolute value) does the air bag exert on the driver's upper body? Ignore gravity since the force was horizontal. Hint: use impulse and the change of momentum.A 0.0600 kg ball is traveling horizontally at 28.5 m/s when it is hit by a badminton racquet. The ball then moves in the opposite direction, also horizontally, at a speed of 44.5 m/s. Take the initial velocity of the ball to be in the -x-direction. (a) What is the impulse delivered to the ball by the badminton racquet? (Give the x-component in Ns. Indicate the direction with the sign of your answer.) ÎN S (b) Some work is done on the system of the ball and some energy appears in the ball as an increase in internal energy during the collision between the ball and the racket. What is the quantity W - AEint for the ball? (Give your answer in J.)An estimated force vs. time curve for a baseball struck by a bat is shown in the figure below. (a) From this curve, determine the impulse delivered to the ball.(b) From this curve, determine the average force exerted on the ball.
- 26. A baseball with a mass of 0.152 kg is moving horizontally at 32.0 m/s [E], when it is struck by a bat for 0.00200 seconds. The velocity of the ball just after the collision is 52.0 m/s [W 20° N]. a) Find the impulse experienced by the ball. b) Find the average net force of the ball. 23. A stationary 2000 kg cannon fires a 25 kg cannon ball horizontally at 250 m/s. Find the velocity of the cannon after firing the cannon ball. You may assume that there is no friction acting on the cannon.TWO-PART QUESTION PART ONE: A 12000 kg tank moving at 8 m/s is broughtto a halt in 1.5 s by a reinforced-steel tankbarrier.What magnitude of the impulse was imparted to the tank?Answer in units of kgm/s. PART TWO: What is the average net force exerted bythe tank on the barrier?Answer in units of N.