Fusion of hydrogen nuclei is the origin of solar energy
Indicate whether the statement is true or false
T
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In the Rutherford model of the hydrogen atom, a proton (mass M, charge Q) is the nucleus and an electron (mass m, charge q) moves around the proton in a circle of radius r. Let k denote the Coulomb force constant (1/4??0) and G the universal gravitational constant. The ratio of the electrostatic force to the gravitational force between electron and proton is:
A) kQq/GMmr2 B) GQq/kMm C) kMm/GQq D) GMm/kQq E) kQq/GMm
Which design is subject to chromatic aberration?
A) refractor B) prime focus reflector C) Newtonian reflector D) Cassegrain reflector E) Gregorian reflector
If the intensity of a sound is increased by a factor of 100, how is the decibel level changed? The new decibel level will be:
a. two units greater. b. double the old one. c. ten times greater. d. twenty units greater.
When gasoline is burned, it gives off 41 000 J/g of heat energy. If an automobile uses 14.1 kg of gasoline per hour with an efficiency of 23.0%, what is the average horsepower output of the engine? (1 hp = 746 W)
a. 49.5 hp b. 105 hp c. 35.1 hp d. 29.8 hp e. 59.5 hp