AP Physics 1 Question 23: Answer and Explanation

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Question: 23

3. If L, M, and T denote the dimensions of length, mass, and time, respectively, what are the dimensions of power?

  • A. L2M/T2
  • B. M2L/T2
  • C. L2M/T3
  • D. ML2/T3

Correct Answer: D


D The SI unit for power, P, is the watt, where 1 watt = 1 joule per second. One joule is equal to 1 newton?meter, and 1 newton = 1 kg?m/s2. Therefore,