Ahydrogen atom in its ground state is placed between the parallel plates of a capacitor. for times t < 0, no voltage is applied. starting at t0, an electric field е-: eo e-t/t is applied, where is a constant. derive the formula for the probability that the electron ends up in state j due to this perturbation. evaluate the result for j: a) a 2s state b) a 2p state

Under normal temperature and pressure conditions, what type of rock could be formed from weathering in erosion of metamorphic rock

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%)

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?