A 200 kg wagon climbs up a hill of slope 30-degrees in 1 minute at a speed of 10 m/s. How much power is delivered by the engine? (Assume g = 10m/s^2)

Category: QuestionsA 200 kg wagon climbs up a hill of slope 30-degrees in 1 minute at a speed of 10 m/s. How much power is delivered by the engine? (Assume g = 10m/s^2)
Editor">Editor Staff asked 1 year ago

A 200 kg wagon climbs up a hill of slope 30-degrees in 1 minute at a speed of 10 m/s. How much power is delivered by the engine? (Assume g = 10m/s^2)
 
(a) 10 kW
 
(b) 20 kW
 
(c) 30 kW
 
(d) 40 kW
 
I had been asked this question during an interview.
 
My doubt stems from Power topic in chapter Work, Energy and Power of Physics – Class 11
Select the correct answer from above options 
Interview Questions and Answers, Database Interview Questions and Answers for Freshers and Experience

1 Answers
Editor">Editor Staff answered 1 year ago

The correct answer is (b) 20 kW
 
Easy explanation: Weight of car = m x g
 
 = 2,00 x 10
 
 = 2,000 N
 
Total force (F) = 2,000
 
Velocity (v) = 10 m/s
 
P = F x v
 
 = 2000 x 10
 
 = 20,000 W
 
 = 20 kW.


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