Stellar cores, near the end of a star’s lifetime, produce iron by fusion. The reason stellar cores don’t go past iron is that
A. iron in stellar cores tends to spontaneously fission.
B. Iron is the most dense material in solid form
C. iron nuclei are the most tightly bound per nucleon.
D. iron is ferromagnetic.
E. iron is heavy.
C. iron nuclei are the most tightly bound per nucleon.
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At approximately what time would a first quarter moon rise?
A) 6 P.M. B) noon C) 9 A.M. D) midnight E) 6 A.M.
A sound wave in brass has a displacement amplitude of 3.00 mm. The frequency of the sound wave 750 Hz and the velocity is 2,813 m/s. If the density of brass is 
then what is the pressure amplitude of the sound wave?
A. 
B. 
C. 
D. 
E. 
The Moon always shows nearly the same face to Earth because
A) the Moon does not rotate. B) sunlight always hits the same face of the Moon. C) the Moon rotates once in the same amount of time that it takes Earth to orbit the Sun once. D) the Moon rotates once in the same amount of time that it takes the Moon to orbit Earth once.
When 10 grams of hot water cool by 1°C, the amount of heat given off is
A) 41.9 calories. B) 41.9 Calories. C) 41.9 joules. D) more than 41.9 joules. E) none of the above