The box of a wellknown breakfast cereal states that one ounc

The box of a well-known breakfast cereal states that one ounce of the cereal contains 120 Calories (1 food Calorie = 4186 J). If 1.84 % of this energy could be converted by a weight lifter\'s body into work done in lifting a barbell, what is the heaviest barbell that could be lifted a distance of 2.19 m?

Solution

120 Cal * 4186 J/Cal = 502320 J

0.0184 * 502320 = 9242.688 J

Work done in lifting mass = m g h

m g * 2.19 = 9242.688

m g = 4220

m = 430.21 kg