2025 · Q5
Assume ‘A ’ does 500 J of work in ‘x’ minutes and ‘B’ does 1000 J of work in 20 minutes. If the power delivered by ‘A’ is P1 and ‘B’ is P2 and P1 = 2P2, then ‘x’, in minutes is:
General KnowledgePhysics
- A10
- B5
- C20
- D25
Explanation
Power is work divided by time. A's power is P1 = 500/x J per minute and B's power is P2 = 1000/20 = 50 J per minute. Given P1 = 2P2, we get 500/x = 100, so x = 5 minutes. Option A (10) would result if one mistakenly set P1 = P2 instead of P1 = 2P2.