Question

Chapter 06, Problem 87 Suppose the skateboarder shown in the drawing reaches a height of 1.50 m above the right side of the semicircular ramp. He then makes an incomplete midair turn and ends up sliding down the right side of the ramp on his back. When the skateboarder reaches the bottom of the ramp, his speed is 7.00 m/s. The skateboarder's mass is 66.0 kg, and the radius of the semicircular ramp is 2.10 m. What is the average frictional force exerted on the skateboarder by the ramp? Number Units the tolerance is +/-2%

Answer 1

Height above ramph) = 1.5m speed at bottom of ramp (y) = 7 m/s - Mass of skateboarder(m) = 66kg - Radius of ramp (v) = 2.1m Schematic 9 Job oon - Bottom Applying Work- energy theorem b/w - top and bottom -Work done by granity macher) -- Work done by friction =-FI (Irl --Change in kinetic energy tmek.o) Faug - 22 ong Cher) Imu

Fang [66308(3.67246349 14. 66x9.6x36 – 33849] Z 6669.8*3.6-33849 IN 22x2-1 215.6N (Ans) DAV Average friction force = 215.6N