An engine does 600 J of work in 20 s. What is its power?
Answer and explanation
Correct answer: C. 30 W
- Step 1: P = W/t. Step 2. 600/20 = 30. Answer: 30 W. Why not the others: 12 000 multiplies, 620 adds and 0.03 inverts.
Practise more Physics.
Free questions with an explanation for every one, and full timed Tawjihi (Palestinian General Secondary Examination), Scientific Stream mock tests.
More Physics questions
- A car starts from rest and accelerates at 3 m/s² for 5 s. What is its final speed?
- A 4 kg mass is pushed by a net force of 12 N. What is its acceleration?
- What current flows through a 4 Ω resistor connected to a 12 V supply?
- Resistors of 2 Ω, 3 Ω and 5 Ω are in series. What is the total resistance?
- Resistors of 6 Ω and 3 Ω are in parallel. What is the total resistance?
- What is the kinetic energy of a 2 kg object moving at 3 m/s?