An 8.10 kilogram box of mass is kept at a height of 0.99 meters above ground level. what is the potential energy of the box? (given g = 9.8 meters/second2). a. 68 joules. b. 79 joules. c. 81 joules. d. 99 joules. e. 1.0 × 102 joules

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy.work depends on the square of the change in potential energy.work is equal to the negative of the change in kinetic energy.work is equal to the square of the change in kinetic energy