biomech # 8

biomech # 8 - 3 Baseball bats are typically 1 kg in weight...

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Section 1 1. What two factors (hint: they are anthropometric characteristics) affect the magnitude of terminal velocity for a falling object such as a cat? 2. Explain how a smaller mass-to-area ratio results in a lower terminal velocity for a falling cat, relative to a fallling human? Section 2 1. During the Olympic event of hammer toss, an athlete gets a 7.25 kg hammer swinging at 570º/s. If the hammer is at the end of a 1.22 m wire what is the minimum amount of force needed to hold on to the hammer without it slipping out of the athletes hands. 2. A figure skater jumps into the air with an I = 8.3 kg·m^2 and angular velocity of 7 rad/s. What will be her new angular velocity when she tucks in her arms and changes her moment of inertia to 4.3 kg·m^2?
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Unformatted text preview: 3. Baseball bats are typically 1 kg in weight with a radius of gyration of .62 m. A certain player normally swings a regular bat with an angular velocity of 420º/s, but interestingly during one game is suddenly able to swing with a bat speed of 530º/s. It is discovered that the bat he is using was corked (hollowed out) in order to increase swing speed. Assuming the bat was the regular length and he swung with the same momentum, how much did the corked bat weigh? 4. The bicep muscle inserts on the radius (bone) 2 cm from the elbow at a 35º angle. What force must the bicep exert to create an angular acceleration of 100º/s^2 in the arm if the arm has a moment of inertia equal to .14 kg·m^2?...
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