exam 1 Copyright ©Wayne Hacker 2011, All rights reserved. Chapter 2: The first l

Question

exam 1 Copyright ©Wayne Hacker 2011, All rights reserved. Chapter 2: The first law of thermodynamics Work, Power, Torque, and Mechanical Energy Problem 16 (Work). An ice skater is giding across the frictionless surface of a frouen pond. As he crosses the pond, the work done by gravity on the skatet is (a) positive (c) zero (e) None of these (b) negative (d) Not enough information Problem 17 (Power). You are pushing a shopping cart with a mass of m acrossa parking speed of u? (a) F lot. The total force of resistance is F. How much power mast you supply to push the cart at (b) Fum Fu (c) m (d) 2F (e) None of these Problem 18. (Torque) The driveshaft of a certain alternator is turning at 300 RMP. It is driven by a belt running from a pulley with a radius of 0.15 m. The net force applied by the belt on the pulley is 2000 N. Determine the torque applied by the belt on the pulley (in N·m) and the power transmitted (in kW) using the relationship P -Tw. (b) 6.3 kw (d) 8.3 kW (a) 9.3 kw (c) 3.3 kW (e) None of these

Explanation / Answer

16. gravity force is perpndicular to displacement so work done is zero.

17. power = force * velocity

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