A rock brought back from the Moon weighs 4 pounds and has a volume of 0.02 cubic feet. What is the rock's weight density?
200 lb/ft3
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Where in the Sun do fusion reactions happen?
A) core and radiation zone B) only the core C) everywhere inside the Sun
If a Cu2+ ion that is initially at rest accelerates through a potential difference of 12 V without friction, how much kinetic energy will it gain? (e = 1.60 × 10-19 C)
A) 3.0 eV. B) 6.0 eV. C) 12 eV. D) 24 eV.
Why can't we see past the cosmological horizon?
A) Beyond the cosmological horizon, we would be looking back to a time before the universe was born. B) We do not have big enough telescopes. C) The cosmological horizon is infinitely far away, and we can't see to infinity. D) Every galaxy in the entire universe (not just the observable universe) exists within the cosmological horizon, so there's nothing to see beyond it.
Electromagnetic radiation with a wavelength of 700 nm would be:
A) X-rays. B) red light. C) violet light. D) ultraviolet light. E) microwaves.