If there is a constant force of kinetic friction of 4000 N between the elevator carriage and the rails, what is the total work required to lift the fully-loaded service elevator 504 m at a constant speed? a) 0 J b) 1.1 × 106 J c) 2.0 × 106 J d) 2.5 × 107 J e) 2.7 × 107 J f) 2.9 × 107 J Assume the elevator uses an electric motor with a 100 kW power output and 70% efficiency. What is the cost of operating this electric motor continuously for 2 minutes? Assume electricity costs $0.11 per kWh. a) $ 0.01 b) $ 0.07 c) $ 0.11 d) $ 0.26 e) $ 0.37 f) $ 0.52
If there is a constant force of kinetic friction of 4000 N between the elevator carriage and the rails, what is the total work required to lift the fully-loaded service elevator 504 m at a constant speed? a) 0 J b) 1.1 × 106 J c) 2.0 × 106 J d) 2.5 × 107 J e) 2.7 × 107 J f) 2.9 × 107 J Assume the elevator uses an electric motor with a 100 kW power output and 70% efficiency. What is the cost of operating this electric motor continuously for 2 minutes? Assume electricity costs $0.11 per kWh. a) $ 0.01 b) $ 0.07 c) $ 0.11 d) $ 0.26 e) $ 0.37 f) $ 0.52
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter5: Energy
Section: Chapter Questions
Problem 7P: A tension force of 175 N inclined at 20.0 above the horizontal is used to pull a 40.0-kg packing...
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Transcribed Image Text:5) If there is a constant force of kinetic friction of 4000 N between the elevator carriage and the rails, what is
the total work required to lift the fully-loaded service elevator 504 m at a constant speed?
a) 0 J
b) 1.1 x 106 J
c) 2.0 × 106 J
d) 2.5 × 107 J
e)
2.7 × 107 J
f)
2.9 × 107 J
6) Assume the elevator uses an electric motor with a 100 kW power output and 70% efficiency. What is the
cost of operating this electric motor continuously for 2 minutes? Assume electricity costs $0.11 per kWh.
a) $ 0.01
b) $ 0.07
c) $ 0.11
d) $ 0.26
e)
$ 0.37
f)
$ 0.52
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