Question

Two friends are playing baseball and the batter wants to hit the ball back so that it goes at twice the speed that it did coming into the hit. The mass of the ball is 0.4 kg, its speed is 41 m/s, r is 0.09 m, bat radius is 0.8 m, mass of bat is 1.1 kg, and angle θ is 40.0°. Approximate the baseball bat as a long thin rod. If the ball is not spinning, what is the magnitude of the angular momentum of the ball right before it hits the bat? 0.948 kg*m^2/s. You are correct. Your receipt no. is 168-3035. Previous Tries: What is the z-component of the initial angular momentum of the ball? Incorrect. Tries 1/8. Previous Tries: What is the z-component of the final angular momentum of the ball (if the ball is traveling twice the initial speed back)? Tries 0/8. At what angular speed would the bat have to be moving for the batter to achieve their goal? Assume that the bat doesn't move after the hit. Tries 0/8. Was linear momentum conserved in this collision? Yes No.

          Two friends are playing baseball and the batter wants to hit the ball back so that it goes at twice the speed that it did coming into the hit. The mass of the ball is 0.4 kg, its speed is 41 m/s, r is 0.09 m, bat radius is 0.8 m, mass of bat is 1.1 kg, and angle θ is 40.0°. Approximate the baseball bat as a long thin rod. If the ball is not spinning, what is the magnitude of the angular momentum of the ball right before it hits the bat? 0.948 kg*m^2/s. You are correct. Your receipt no. is 168-3035. Previous Tries: What is the z-component of the initial angular momentum of the ball? Incorrect. Tries 1/8. Previous Tries: What is the z-component of the final angular momentum of the ball (if the ball is traveling twice the initial speed back)? Tries 0/8. At what angular speed would the bat have to be moving for the batter to achieve their goal? Assume that the bat doesn't move after the hit. Tries 0/8. Was linear momentum conserved in this collision? Yes No.
        
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University Physics with Modern Physics
University Physics with Modern Physics
Hugh D. Young 14th Edition
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Two friends are playing baseball and the batter wants to hit the ball back so that it goes at twice the speed that it did coming into the hit. The mass of the ball is 0.4 kg, its speed is 41 m/s, r is 0.09 m, bat radius is 0.8 m, mass of bat is 1.1 kg, and angle θ is 40.0°. Approximate the baseball bat as a long thin rod. If the ball is not spinning, what is the magnitude of the angular momentum of the ball right before it hits the bat? 0.948 kg*m^2/s. You are correct. Your receipt no. is 168-3035. Previous Tries: What is the z-component of the initial angular momentum of the ball? Incorrect. Tries 1/8. Previous Tries: What is the z-component of the final angular momentum of the ball (if the ball is traveling twice the initial speed back)? Tries 0/8. At what angular speed would the bat have to be moving for the batter to achieve their goal? Assume that the bat doesn't move after the hit. Tries 0/8. Was linear momentum conserved in this collision? Yes No.
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Transcript

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00:01 Hi, this is a question based on conservation of angular momentum.
00:10 So, in this question we have the initial angular momentum is given by i omega i minus m into vi into d which is equal to final momentum which is i f into wf plus m into vf into d.
00:24 So, on substituting the values we have this is 0 .3 into w minus 0 .15 into 50 into 0 .8 is equal to 0 .3 into 0 .35 omega into so plus this is 0 .15 into 40 into 0 .8.
00:44 So, in this case we have to find omega...
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