How much work does a supermarket checkout attendant do on a can of soup he pushes 0.840 m horizontally with a force of 4.90 N? Express your answer in joules and kilocalories. (For each answer, enter a number.) 1. work in joules J work in kilocalories kcal How much work (in J) is done by the boy pulling his sister 25 m in a wagon as shown in the figure below? 2. F 30 O O Assume no friction acts on the wagon. (Assume d = 25 m and F = 52 N. Enter a number.) W = 3. (a) How much gravitational potential energy (in ]) (relative to the ground on which it is built) is stored in an Egyptian pyramid, given its mass is about 8 x 10 kg and its center of mass is 40.0 m above the surrounding ground? (Enter a number.) J (b) What is the ratio of this energy to the daily food intake of a person (1.2 x 10/ J)? (Enter your answer as a ratio to the number 1. Enter a number.) :1