An electric motor has a power rating of 1.60 kW and operates at 75% efficiency. The amount of work that it can do in 1.0 hrs is__ x10^6J. Give your answer with the correct number of sig digs and do not include units)

4.3 x 10^6 J

Explanation: P= W/t so W=Pt.

The power here is 1600 J/s (1.6 kW) and the time is 3600s (1 hour x 60 mins x 60 seconds).

1600x3600 = 5760000 J (5.76 x 10^6 J).

Efficiency = Eout/Ein so Eout = Efficiency x Ein.

(0.75) x (5.76 x 10^6) = 4.3x10^6 J.

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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