A food calorie is a kilocalorie in SI units.What would be the speed of a 1000 kg car traveling such that its kinetic energy is equal to the energy contained in one 250-calorie jelly doughnut?

Question

Quizplus · Accepted Answer

A 250-calorie jelly doughnut contains 250 kilocalories, which is equivalent to 250,000 calories or 1,045,000 joules (since 1 calorie = 4.18 joules). The kinetic energy (KE) of the car is given by KE = 0.5 * mass * velocity^2. Setting this equal to the energy of the doughnut and solving for velocity gives v = sqrt((2 * 1,045,000) / 1000) = 46 m/s.

A Food Calorie Is a Kilocalorie in SI Units