On cloudless nighs, heat escapes from our planet and goes into empty space a. conduction b. convection c. radiation

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?

Carbon 14 is a naturally occurring stable

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat