What does a condenser in a coal-burning power plant do?
a. cools the steam so it can be converted back to liquid water
b. heats the water so it can produce steam
c. collects the steam and releases it back to the atmosphere

Why should seat belts not be mandatory quick plz

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=