Question

Samantha wishes to maintain her weight and goes to the gym to work off the calories she consumed at breakfast that morning. She lifts a 24.0-kg barbell from shoulder level to above her head, through a vertical height of 0.550 m. How many times must she lift the barbell to make up for the 3.50 102 Calories of energy she consumed at breakfast?

Answer 1

here,

for the energy needed to lift the barbell

u1 = mgh

u1 = 24 * 9.8 * 0.550

u1 = 129.4 J

Now, for the total number of times

number of times taken = total energy/u1

number of times taken = 3.5 *10^2 * 4186/(129.4)

number of times taken = 11325

the number of times taken is 11325