Why do the planets move in fixed orbits around the Sun? A) The magnetic pull of the Sun holds them in their orbits. B) The gravitational pull of the Sun holds them in their orbits. Eliminate C) The nuclear force between the Sun and the planets holds them in their orbits. D) The electrostatic force of attraction between the Sun and the planets holds them in their orbits.

Air enters a compressor operating at steady state at 1.05 bar, 300 k, with a volumetric flow rate of 93 m3/min and exits at 12 bar, 400 k. heat transfer occurs at a rate of 15.5 kw from the compressor to its surroundings. assuming the ideal gas model for air neglecting kinetic potential energy effects, determine the power in put in kw.

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.

Which transition by an electron will release the greatest amount of energy? oa ob oc od