A 1.00 x 104 W electric motor is used to lift a 955 kg object vertically 25.0 m at a constant velocity in 45.0 s. What is

Question

A 1.00 x 104 W electric motor is used to lift a
955 kg object vertically 25.0 m at a constant
velocity in 45.0 s. What is the efficiency of the
motor?

in progress 0
Thiên Di 4 weeks 2021-08-30T21:13:53+00:00 1 Answers 0 views 0

Answers ( )

    0
    2021-08-30T21:15:27+00:00

    Answer: 52%

    Explanation:

    1W = 1 J/s

    motor input is 10000 J/s

    Potential energy change

    PE = 955(9.81)(25.0) = 234,213.75

    power needed to change the PE in that time

    P = 234,213.75/ 45 = 5,204.75 Watts

    motor is 5204.75 / 10000 = 0.520475 or 52% efficient

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )