3. An electric motor consumes 9.00 kJ of electrical energy in 1.00 min. If one-third of this energy goes into heat and other forms of internal energy of the motor, with the rest going to the motor output, how much torque will this engine develop if you run it at 250 rpm?

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Mechanical Engineering

Answer only number 3. 

B. Solve the following problems.
1. It took a constant 500 W power to run an engine from rest to its operating speed in 20 seconds. What is the operating
speed of the rotating engine if its moment of inertia is 0.2 kg-m2?
2. You apply a constant torque of 100 Nm to tighten a bolt. If it took 10 revolutions for the bolt to tighten up, how much
work did you do?
3. An electric motor consumes 9.00 kJ of electrical energy in 1.00 min. If one-third of this energy goes into heat and other
forms of internal energy of the motor, with the rest going to the motor output, how much torque will this engine develop if
you run it at 250 rpm?
Transcribed Image Text:B. Solve the following problems. 1. It took a constant 500 W power to run an engine from rest to its operating speed in 20 seconds. What is the operating speed of the rotating engine if its moment of inertia is 0.2 kg-m2? 2. You apply a constant torque of 100 Nm to tighten a bolt. If it took 10 revolutions for the bolt to tighten up, how much work did you do? 3. An electric motor consumes 9.00 kJ of electrical energy in 1.00 min. If one-third of this energy goes into heat and other forms of internal energy of the motor, with the rest going to the motor output, how much torque will this engine develop if you run it at 250 rpm?
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