Why does a skydiver accelerate as she falls to the earth before opening her chute? A) because she loses mass during her travel
B) because she gets further from the airplane
C) because the force of the earth pulls on her
D) because fewer forces are present to slow her down as she drops

Carbon 14 is a naturally occurring stable

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)