Problem 8: A skateboarder with mass m, = 47 kg is standing at the top of a ramp which is h, = 4.4 m above the ground. The skateboarder then jumps on his skateboard and descends down the ramp. His speed at the bottom of the ramp is vf= 6.4 m/s. Part (a) Write an expression for the work, Wr, done by the friction force between the ramp and the skateboarder in terms of the variables given in the problem statement. Expression : Wf= Select from the variables below to write your expression. Note that all variables may not be required. cos(0), sin(0), a, ß, n, Q, 0, d, g, hy, mg, P, t, Vf, Wf Part (b) The ramp makes an angle 0 with the ground, where 0 = 30°. Write an expression for the magnitude of the friction force, f,, between the ramp and the skateboarder. Expression : F%= Select from the variables below to write your expression. Note that all variables may not be required. cos(0), sin(0), a, ß, A, Q, 0, d, g, hy, m,, P, t, Vf, Wf

Problem 8: A skateboarder with mass m, = 47 kg is standing at the top of a ramp which is h, = 4.4 m above the ground. The skateboarder then jumps on his skateboard and descends down the ramp. His speed at the bottom of the ramp is vf= 6.4 m/s. Part (a) Write an expression for the work, Wr, done by the friction force between the ramp and the skateboarder in terms of the variables given in the problem statement. Expression : Wf= Select from the variables below to write your expression. Note that all variables may not be required. cos(0), sin(0), a, ß, n, Q, 0, d, g, hy, mg, P, t, Vf, Wf Part (b) The ramp makes an angle 0 with the ground, where 0 = 30°. Write an expression for the magnitude of the friction force, f,, between the ramp and the skateboarder. Expression : F%= Select from the variables below to write your expression. Note that all variables may not be required. cos(0), sin(0), a, ß, A, Q, 0, d, g, hy, m,, P, t, Vf, Wf

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 7PE: A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N...

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