10. Conservation of Energy
Solving Projectile Motion Using Energy
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- Multiple Choice
You are practicing jumping as far as you can. In one attempt, you run and leave the floor with 7 m/s directed at an unknown angle. What maximum height do you reach if your speed at that point is 5 m/s? Ignore air resistance.
1729views33rank2comments - Multiple ChoiceA toy gun is mounted on a tabletop. It shoots a small plastic ball at . The ball leaves the toy gun at an angle of 24° above the horizontal, and a height of above the ground. How fast is the ball travelling when it hits the ground? Use energy concepts.1308views
- Multiple ChoiceCalvin uses a catapult to launch a foam football at Susie. If the ball leaves the catapult at a height of and is moving at when it strikes the ground (he missed), how fast was the football moving when it left the catapult? Ignore air resistance.1224views
- Multiple ChoiceA spring-loaded toy gun shoots a plastic ball straight up into the air. From the position of the ball when the gun is cocked, with the spring compressed, to the maximum height the ball reaches, is . If the spring was compressed , what is the spring constant of the spring? Ignore air resistance.1519views
- Textbook Question
A film of Jesse Owens’s famous long jump (Fig. 8–48) in the 1936 Olympics shows that his center of mass rose 1.1 m from launch point to the top of the arc. What minimum speed did he need at launch if he was traveling at 6.5 m/s at the top of the arc?
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1413views - Textbook Question
Early test flights for the space shuttle used a “glider” (mass of 980 kg including pilot). After a horizontal launch at 480 km/h at a height of 3200 m, the glider eventually landed at sea level with a speed of 210 km/h. What would its landing speed have been in the absence of air resistance?
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