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biomech #9 - kg/m^3 and the athlete runs at 7 m/s What will...

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After you have finished reading Assignment 9, answer the following questions; the purpose of these questions is to help you better understand the primary objectives of the study. The second section of the quiz covers concepts discussed in class. You may write and save your answers in a Word document, but please cut and paste them into the entry box when you submit them. You may use the actual article to answer the questions in Section 1, and you may use the equation sheet that can be accessed on the welcome page of the class website to answer the questions in Section 2. You cannot use friends or others to help you complete this quiz. Section 1 1. What is peak bone mass and why is there a push to optimize it in the early years of life? 2. Why can greater bone growth be obtained by subjects who have no previous history of weight-bearing exercise compared to those who do? Section 2 1. As part of a training regimen, an athlete runs with a parachute. The parachute has an area of 4 meters squared and a coefficient of drag equal to 0.8. The density of air is 1.00
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Unformatted text preview: kg/m^3 and the athlete runs at 7 m/s. What will be the work done by the athlete after running 50 meters? 2. How much more work will the athlete do if he increases his velocity to 8.5 m/s? 3. A rower pulls his oar through the water at a velocity of 0.9 m/s, relative to the water. The density of water is 1000 kg/m^3 and the paddle has an area of 0.13 meters squared with a coefficient of drag equal to 1.4. The paddle is located at the end of an oar, 2.2 meters from a pivot point on the edge of the boat. Assuming that the drag force is always perpendicular to the oar, what is the torque of the drag force on the oar? 4. A 80 kg skydiver opens up his parachute and begins a gentle descent to the ground. The coefficient of drag acting on the parachute is 1.5 and the area of the parachute is 30 square meters. The density of air is 1 kg/m^3. What is the terminal velocity that the skydiver will reach in his parachute?...
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