Posted by **Michele** on Friday, August 31, 2007 at 8:03pm.

A man drinks a bottle of beer and proposes to work off its 460 kj by exercising with a 20 kg barbell. If each lift of the barbell from chest height to over his head is through 60 cm and the efficiency of his body is 10 percent under these circumstances, how many times must he lift the barbell?

- Science -
**drwls**, Friday, August 31, 2007 at 8:14pm
Solve this equation:

(Energy consumed) * 0.10 = Work done

(460*10^3 J)* 0.10 = (number of lifts) * (M g)* (0.60 m)

M = 20 kg and g = 9.80 m/s^2.

Solve for the number of lifts

- Science -
**drwls**, Friday, August 31, 2007 at 11:28pm
I gave you the equation to solve for the number of lifts, and told you what M and g are in the equation. The rest is just doing the numbers.

- Science -
**Anonymous**, Wednesday, April 27, 2011 at 7:37am
67

## Answer This Question

## Related Questions

- Physical science - A man drinks a bottle of beer and proposes to work off it's ...
- Physics - A man drinks a bottle of beer and proposes to work off it's 460 kj by ...
- physics - A weightlifter holding a 500 kg barbell waist high carries the barbell...
- Physics - A weight lifter is bench-pressing a barbell whose weight is 710 N. He ...
- Science - A weight lifter lifts a barbell from the ground, raises it at a ...
- physical science - Trying to find the power to this ?. A weightlifter lifts a ...
- physics - A weight lifter lits a 1250 pound barbell 2 meters in 3 seconds. How ...
- College Physics - (a) How many hours does it take him to work off a 450 Calorie ...
- Physics - the work done in lifting a 600-N barbell 1.6m above the floor. What is...
- Biomechanics - Bob bench presses a 50 lb barbell. He maintains a constant speed ...

More Related Questions