Europa has few craters because
a. it is protected from impacts by Jupiter's gravity.
b. it does not have a solid surface.
c. it has erased craters nearly as fast as they have formed.
d. its surface is not strong enough to support craters.
e. it keeps one face always pointed toward Jupiter which screens it from incoming meteorites.
c
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Consider a radioactive substance with a half-life of 10 years. If you start with 1 kilogram of this substance, after 20 years, ________ of the radioactive substance will remain.
A) 0.25 kilogram B) none C) 0.75 kilogram D) 0.5 kilogram
Black holes suck up all matter in sight
Indicate whether the statement is true or false
What is the energy of the first rotational state of the hydrogen (H2) molecule? The separation between the protons is 10?10 m and the mass of each proton is 1.67 × 10^?27 kg. (h = 6.626 × 10^?34 J ? s and 1 eV = 1.6 × 10^?19 J.)
A 30-mF capacitor is charged to 80 V and then connected across an initially uncharged capacitor of unknown capacitance C. If the final potential difference across the 30-mF capacitor is 20 V, determine C
a. 60 mF b. 75 mF c. 45 mF d. 90 mF e. 24 mF