The mass of Mars is 6.419 x 1026 kg, and the mass of a single proton is 1.673 x 10-22 kg. Assuming Mars is made entirely of protons, how many protons would make up Mars?
a. 1.071 protons
b. 3.837x 10 protons
c. 3.837x 10-54 protons
d. 2.610x1054 protons

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

An equinox occurs when a. neither end of earth's axis is tilted toward or away from the sun. b. the north end of earth's axis is tilted away from the sun. c. the north end of earth's axis is tilted toward the sun. d. earth's axis is parallel to the sun's rays. select the best answer from the choices provided a b c d

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)