Question

Brad tries out a weight-loss plan that involves repeatedly lifting a 42.9-kg barbell from the floor over his head to a height of 2.00 m. If he is able to complete three such lifts per minute, how long will it take for him to lose 0.50 kg of fat? “Burning” 1 g of fat supplies 37.1 kJ to the body; of this, 10.0% can be used by the muscles to lift the barbell. (Ignore the fat “burned” while he lowers the barbell to the floor.)

Answer 1

Answeg;- work done in a minile = 3mgh = 3x429k9x98x2m = 2592.55 energy supplied by fat = 0.1X500g x 37.1kJ 20.1X500g x 37.1x103 J = 1-86X18 J Time taken to own tat to 1.86x10°J. 785.47 min = 12hg 2522.5J