In the bohr theory of the hydrogen atom, an electron moves in a circular orbit about a proton, where the radius of the orbit is approximately 0.550 ✕ 10-10 m. (the actual value is 0.529 ✕ 10-10 m.)
(a) find the electric force exerted on each particle, based on the approximate (not actual) radius given.
(b) if this force causes the centripetal acceleration of the electron, what is the speed of the electron?

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)