1.

A force F = (5i – 3j +2k) N moves a particle from r1 = (2i + 7j + 4k) m to r2 = (5i + 2j + 8k) m. What is the work done by the force?(a) 18 J(b) 28 J(c) 38 J(d) 48 JThis question was addressed to me in an online interview.I want to ask this question from Work Done by a Variable Force topic in portion Work, Energy and Power of Physics – Class 11

Answer»

The correct answer is (c) 38 J

The best explanation: Displacement (d) = r2 – r1

 = (3I5J + 4K) m

Work = Force . Displacement; [Dot product of vectors]

 = (5i – 3j +2k) .(3i – 5j + 4k)

 = 38 J.



Discussion

No Comment Found

Related InterviewSolutions