What is the change in internal energy if 70 J of heat is added to a system and the system does 30 J of work on the surroundings? Use AU = Q-W.
A. -40 J
B. -100 J
C. 100 J
O D. 40 J

Energy flows from the producer level to the level. is called

Increasing the pressure on one spot of a fluid will increase the pressure everywhere else in the fluid a. pascals principal b. archimedes' principal c. bernoulli's principal

The protons in a nucleus are approximately 2 ✕ 10^−15 m apart. consider the case where the protons are a distance d = 1.93 ✕ 10^−15 m apart. calculate the magnitude of the electric force (in n) between two protons at this distance.