4. At a county fair, Sam tries his hand at the ring-the-bell attraction. He swin

Question

4. At a county fair, Sam tries his hand at the ring-the-bell attraction. He swings the mallet hard enough to give the ball an initial speed of 8.0 m/s. Neglecting losses to friction, etc, will he ring the bell that is 3 m off the ground? 1 % 5. a) At the same county fair, Katie tries the frictionless water slide. The starting point is 9 m above ground. She pushes off with a speed of 2 m/s. How fast is she going at the bottom? Ans: 13.43m 6. The Skate park A skateboarder starts at the top of the skate park jump and is heading down the jump. 3m The distance along the skate jump is as marked below. The top of the skate jump starts at an elevation of 3 meters above the ground, the skate jump track reaches a minimum of 0.7 meters above the ground, 1.2 m and the take-off is at 1.2 meters above the ground. Assuming that the forces due to friction and air .7 m resistance are 0. 0 m 4m 5m m i. If the skateboarder has a mass of 80 kg (176 lbs), what is the kinetic energy of the skateboarder after going 4 meters along the track? ii. What is the take-off speed of this skateboarder in m/s?

Explanation / Answer

4. kinetic energy = potential energy
0.5mV^2 = mgh
h= v2/2g
= 3.26 m
3.26>3  
so yes it will ring the bell

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