Which of the following is the internal energy of a system? A) The total thermal energy gained by the system during melting and boiling.
B) The sum of the potential and the kinetic energies of the particles of the system.
C) The total external work done on the system during melting and boiling.
D) The change in the potential energy of the system that occurs during melting and boiling.

Abird sitting high in a tree is an example of what type of wnergy

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?