A A 145 Gram Baseball Has An Initial Velocity Of 35 0 M S Toward The Right It Strikes A Concrete Wall Making Contact 1 (23.96 KiB) Viewed 55 times
A A 145 Gram Baseball Has An Initial Velocity Of 35 0 M S Toward The Right It Strikes A Concrete Wall Making Contact 2 (24.92 KiB) Viewed 55 times
a.) A 145-gram baseball has an initial velocity of 35.0 m/s toward the right. It strikes a concrete wall, making contact with the wall for 0.120 seconds. During the collision, the ball loses 62.0 J of kinetic energy. What is the magnitude and direction of the average force acting on the ball and what is the final velocity? (Ans. = 19.2 m/s, F= 65.5 N to the left.) 35.0 m/s 30.0 ??? m/s b.) A 0.800 kg block begins from rest and slides down a 30.0-degree incline for 1.20 meters. The coefficient of kinetic friction between the block and incline is 0.450. Compute the final speed at the bottom. (Ans. y 1.61 m/s.) c.) Impulse and work are alternate forms of Newton's 2 law of motion. True or False? (Ans. True.)
a.) A cue ball strikes a stationary pool ball, and they scatter in two dimensions as shown. Find angle 0 and the speed of the cue ball after the collision. (The masses of the balls are the same.) (Ans. 0.63 m/s, 8=41.0") cue 1.60 m/s pool ball 20.0* ??? m/s 1.20 m/s b.) A 50.0-gram piece of putty is thrown at a stationary 2.50 kg block at 25.0 m/s. The putty collides and sticks to the block. With what velocity does the pair move after the collision? (Ans. vy0.49 m/s.) c.) You stand still on a frozen lake. You throw a 2.50 kg rock toward the right at a speed of 3.00 m/s. With what speed do you recoil (assume your mass is 60.0 kg)? Is kinetic energy conserved? Explain. (Ans. 0.13 m/s, Kinetic energy is not conserved since initial Kis zero and final K is greater than zero.) ??? m/s 3.00 m/s
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