Physics

. A weightlifter lifts a 76.0 kg barbell 2.60 m 20 times in 1.50 minutes. What is his power output
(a) in watts and (b) in hp?

  1. 👍 0
  2. 👎 0
  3. 👁 148
  1. a. Fb = m*g = 76 * 9.8 = 744.8 N. = Force of barbell.

    Po = 20 * 744.8 * 2.6/90s = 430.3 J/s =
    430.3 W.

    b. hp = 430.3/746 = 0.577

    1. 👍 0
    2. 👎 0
    posted by Henry

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    Dimas Pyrros (four-time Olympic medalist) raises a 215 kg barbell in two stages. In the first stage he raises it to his shoulders, a height of 1.60 m, by exerting a maximum force of 3000 N. In the second stage he raises the

    asked by Asad on November 11, 2019
  2. physics

    A weightlifter holding a 500 kg barbell waist high carries the barbell at a constant height and a constant speed to a rack 2 m away, and places the barbell on the rack at the same height at which he was carrying it. How much work

    asked by kalisha on March 13, 2010
  3. Physics

    How much work does a weightlifter do on a 450 N barbell thathe lifts 2m into the air

    asked by Emma Roberts on January 12, 2016
  4. physical science

    how much power is used when a weightlifter lifts a 1250-n barbell 2 meters in 3 seconds.

    asked by Liam on April 26, 2011
  5. physics

    An athlete whose mass is 94.0 is performing weight-lifting exercises. Starting from the rest position, he lifts, with constant acceleration, a barbell that weighs 600 . He lifts the barbell a distance of 0.50 in a time of 2.2 .

    asked by Anonymous on November 9, 2012
  1. physical science

    Trying to find the power to this ?. A weightlifter lifts a 1250-n barbell 2meters in 3seconds. How much power was used to lift the barbell? Do you have to find the work first??

    asked by Liam on April 26, 2011
  2. college physics

    A weightlifter has a basal metabolic rate of 92.4 W. As he is working out, his metabolic rate increases by about 650 W. (a) How many hours does it take him to work off a 450 Calorie bagel if he stays in bed all day? (b) How long

    asked by Anonymous on November 12, 2013
  3. College Physics

    A weightlifter has a basal metabolic rate of 64.6 W. As he is working out, his metabolic rate increases by about 650 W. (a) How many hours does it take him to work off a 450 Calorie bagel if he stays in bed all day? (b) How long

    asked by Maria on November 24, 2014
  4. physics

    A weightlifter has a basal metabolic rate of 64.6 W. As he is working out, his metabolic rate increases by about 650 W. (a) How many hours does it take him to work off a 450 Calorie bagel if he stays in bed all day? (b) How long

    asked by Maria on November 24, 2014
  5. physics

    An athlete whose mass is 94.0 is performing weight-lifting exercises. Starting from the rest position, he lifts, with constant acceleration, a barbell that weighs 600 . He lifts the barbell a distance of 0.50 in a time of 2.2 .

    asked by Anonymous on November 9, 2012

More Similar Questions