The electric motor of a model train accelerates the train from rest to 0.600 m/s

Question

The electric motor of a model train accelerates the train from rest to 0.600 m/s in 18.0 ms. The total mass of the train is 580 g. Find the average power delivered to the train during its acceleration.

point      m/s point     
Your response differs from the correct answer by more than 10%. Double check your calculations. m/s The electric motor of a model train accelerates the train from rest to 0.600 m/s in 18.0 ms. The total mass of the train is 580 g. Find the average power delivered to the train during its acceleration. A block of mass m = 7.00 kg is released from rest from point and slides on the frictionless track shown in the figure below. (Assume ha = 7.30 m.) Determine the block's speed at points and . Determine the net work done by the gravitational force on the block as it moves from point to point .

Explanation / Answer

Ques: 1 -- Average power delivered= [(K.E)f-(K.E)i ]/t= (1/2)*.580*(.6^2)/18/.001= 58 W..

Ques: 2 -- Velocity at pt. B = (9.8*(7.3-3.2)*2)^0.5=8.964m/s..

Velocity at pt. C = (9.8*(7.3-2)*2)^0.5 = 10.19 m/s..

Ques:3 -- Net work done by gravity = change in K.E. = .5*7*[(10.19^2)]=363.42J..

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