A construction worker uses a pulley and a rope to raise an 85 kg person to a height of 2 m in 6 s. How much did he do?

Question

A construction worker uses a pulley and a rope to
raise an 85 kg person to a height of 2 m in 6 s. How
much did he do?

in progress 0
Orla Orla 4 years 2021-08-17T06:51:34+00:00 1 Answers 18 views 0

Answers ( )

  1. Euphemia
    0
    2021-08-17T06:52:45+00:00
    Reply

    Answer: Work is 1.7 kJ,  Power is 280 W

    Explanation: Work  W = mgh, power P= W/t

    W = 85 kg·9.81m/s²·2 m = 1667.7 J

    P = 1667.7 J / 6 s = 277.95 W

Leave an answer

Browse

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