On December 21, the noonday Sun is overhead at what latitude?
a. 0°
b. 23.5°N
c. 23.5°S
d. That of the Tropic of Cancer
c
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If the volume of an object doubles with no change in mass, its density would be
A) half. B) double. C) unchanged.
A weightless spring of force constant 2.50 N/cm is 15.0 cm long when nothing is attached to it. It is now used to pull horizontally on a 12.5 kg box on a smooth horizontal floor
You observe that the box starts from rest and moves 96.0 cm during the first 1.60 s of its motion. How long is the spring during this motion?
What forms in nucleosynthesis?
A.) Most of the Helium-4 in the Universe. B.) Most of the Hydrogen-1 in the Universe. C.) Stars. D.) The cosmic microwave background radiation. E.) Quarks
What sorts of materials serve as moderators in nuclear reactors?
a. water b. boron c. graphite d. concrete