If a hydrogen atom in the ground state absorbs a photon of energy 12.09 eV, to which state will the electron make a transition?
A) n = 4 B) n = 5 C) n = 3 D) n = 2
C
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The water level in a reservoir is maintained at a constant level. What is the exit velocity in an outlet pipe 3.0 m below the water surface?
A. 2.4 m/s B. 3.0 m/s C. 5.4 m/s D. 7.7 m/s E. 49 m/s
A heat engine has an efficiency of 31.4% and receives 8.72 kJ of heat per cycle
(a) How much work does it perform in each cycle? (b) How much heat does it exhaust in each cycle?
The "triple point" of a substance is that point for which the temperature and pressure are such that:
A. only solid and liquid are in equilibrium B. only liquid and vapor are in equilibrium C. only solid and vapor are in equilibrium D. solid, liquid, and vapor are all in equilibrium E. the temperature, pressure and density are all numerically equal
What other force balances the downward pull of gravity on a NASA satellite while it is in orbit around Earth?
A) The velocity. B) Centrifugal force. C) The acceleration. D) A balancing force is not needed because gravity doesn't act on the satellite. E) There is no balancing force--gravity is the only force on the satellite.