The ratio of carbon-14 to nitrogen-14 in an artifact is 1:7. Given that the half- life of carbon-14 is 5730 years, how old is the artifact?
A. 5730 years
B. 22,920 years
C. 11,460 years
D. 17,190 years

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight

Which type of reaction is shown in this energy diagram ?