Human-like Grading, Automated The Expert TA Chapter 4-A test Begin Date: 531/201

Question

Human-like Grading, Automated The Expert TA Chapter 4-A test Begin Date: 531/2017 PM Due Date: he rides his skateboard Problem 3: Ateenager of mass mu 6I kg pushes backward against the ground with his foot as This exerts a horizontal force of magnitude F 135 N. The skateboard has m2 2.2 kg. Randomized Variables 135 N mu m 61 kg m2 22 kg A 25% Part (a) write an expression for the magnitude of component of force that the ground exerts on the teenager's foot, the horizontal Grade Summary Potential 100% 7 8 9 per attempt) 4 5 6 2 3 Feedback: 5% deduction per feedback. Hints: deduction per hint. Hints remaining: Fw is the normal force and F A 25% Part (b) Choose the correct free-body diagram for the system made up of teenager and his skateboard. is the weight of the teenager and the skateboard. skateboard's acceleration, a, while the teenager is 25% Part write an expression in of given quantities for the magnitude of in m/s2? (e) terms the pushing backwards on the ground. of acceleration, a, 4 25% Part (d) what is the numerical value for the magnitude the TA LLC

Explanation / Answer

A.) Fground= Ffoot =13.5 N

B ) Diagram
C.) a = Ffoot / (m1+m2)
D.) 13.5N/(2.2kg+61kg)=0.214 m/s^2

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