Each second, a nuclear power plant generates 2000 mj of thermal energy from nuclear reactions in the reactor's core. this energy is used to boil water and produce high-pressure steam at 300 degree c. the steam spins a turbine, which produces 700 mj of electric power, then the steam is condensed and the water is cooled to 30 degree c before starting the cycle again.
a. what is the maximum possible efficiency of the plant?
b. what is the plant's actual efficiency?

Which planet do you think would be easiest for humans to colonize some day?

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?

One hazard of space travel is debris left by previous missions. there are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. calculate the force exerted by a 0.110 mg chip of paint that strikes a space shuttle window at a relative speed of 5.00 ✕ 103 m/s and sticks, given the collision lasts 6.00 ✕ 10-8 s. such a collision chipped the window of the ill-fated challenger in june 1983, causing $50,000 of damage.