A2,000 g quantity of c-14 is left to undergo radioactive decay. the half-life of c-14 is approximately 5,700 years. after going trough x half-lives, the sample becomes 125 grams. what is x? a) 22,800 b) 28,500 c) 4 d) 5

How does convection affect our atmosphere? our layers of earth? our oceans?

Apossible explanation for a set of facts that can be tested by further investigation is called

Asteam power plant operates on an ideal reheat rankine cycle between the pressure limits of 15 mpa and 10 kpa. the mass flow rate of steam through the cycle is 12 kg/s. steam enters both stages of the turbine at 500°c. if the moisture content of the steam at the exit of the low-pressure turbine is not to exceed 10 percent, determine (a) the pressure at which reheating takes place, (b) the total rate of heat input in the boiler, and (c) the thermal efficiency of the cycle. also, show the cycle on a t-s diagram with respect to the saturation lines. (2.15 mpa; 45.0 mw; 42.6%)