alleryPower is defined as the:
- amount of work done
- force per unit area
- rate of doing work (or rate of energy transfer)
- mass times acceleration
Show answer and solution
Correct answer: C. rate of doing work (or rate of energy transfer)
Power = work/time.
NDA Unit 1B: Kinematics: 2D Motion & Projectiles — practice questions — page 2
Explore 41 free Unit 1B: Kinematics: 2D Motion & Projectiles questions in NDA Physics. Open each question or exercise to read its content, reference answers and available explanation.
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Power is defined as the:Read the answer and worked solution →The SI unit of power is the:Read the answer and worked solution →1 horsepower is approximately equal to:Read the answer and worked solution →If 600 J of work is done in 30 s, the power developed is:Read the answer and worked solution →1 kilowatt-hour (the commercial unit of electrical energy) equals:Read the answer and worked solution →Mechanical advantage (MA) of a machine equals:Read the answer and worked solution →For an ideal (frictionless) machine, the work output equals:Read the answer and worked solution →The efficiency of a real machine is always:Read the answer and worked solution →A lever in which the fulcrum lies between the load and the effort is a:Read the answer and worked solution →Examples of simple machines include all of the following EXCEPT:Read the answer and worked solution →A 50 N load is lifted by an ideal machine using an effort of 10 N. The mechanical advantage is:Read the answer and worked solution →
Worked practice questions
The SI unit of power is the:
- joule
- watt
- newton
- pascal
Show answer and solution
Correct answer: B. watt
1 W = 1 J/s.
1 horsepower is approximately equal to:
- 75 W
- 100 W
- 746 W
- 1000 W
Show answer and solution
Correct answer: C. 746 W
1 hp ≈ 746 W.
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