What energy store is in the hammer
BEFORE it hits the nail?

Awhite-blue star is hotter than a red star. select the best answer from the choices provided true or false

Notice how they put future which of the clouds shown would indicate a possible future rain storm? a) b) c) d)

What is the change in internal energy if 20 j of heat is released from a system and the system does 50 j of work on the surroundings? a. -70 j b. 30 j c. -30 j d. 70 j