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 30.0-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 3.10 102 Calories of energy she consumed at breakfast? Note that Calories refers to food calories.

__reps

Answer 1

here,

the mass of rod , m = 30 kg

height , h = 0.55 m

let the number of reps be N

the total energy consumed , TE= 310 Cal = 1297.04 J

1297.04 = N * energy consumed in each rep

1297.04 = N * m * g * h

1297.04 = N * 30 * 9.81 * 0.55

solving for N

N = 8 reps

the number of reps is 8 reps