I) ii) Which of the following is an example of
the first law of thermodynamics?
(A)The specific heat of an object explains
how easily it changes temperatures.
(B)While melting, an ice cube remains
at the same temperature.
(C) When a refrigerator is unplugged,
20
everything inside of it returns to room
temperature after some time.
(D) After falling down the hill, a ball's
kinetic energy plus heat energy equals
the initial potential energy.

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Asystem containing an ideal gas at a constant pressure of 1.22×10^5 pa gains 2140 j of heat. during the process, the internal energy of the system increases by 2320 j. what is the change in volume of the gas?

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.