If the mass of the Sun were smaller by a factor of 1/3, how would the force between the Sun and the Earth change?
A) it would remain unchanged
B) it would decrease by a factor of three
C) it would triple
D) it would decrease by a factor of nine
E) it would be nine times more
Ans: B) it would decrease by a factor of three
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How many times faster does sound travel through iron rails than through air at 20.°C?
A) 12.8 B) 13.1 C) 12.2 D) 13.6 E) 13.9
The most common isotope of uranium is U-238, but the form used in nuclear bombs and nuclear power plants is U-235. Given that uranium has atomic number 92, how many neutrons are in each of these two isotopes?
What will be an ideal response?
Silicates
a. are minerals. b. contain silicon and oxygen. c. consist of tetrahedra. d. all of the above.
A bar magnet and an electrically polarized object are placed next to each other on a table. What happens?
A. The object and magnet accelerate toward each other until they touch and then they repel B. The positive part of the object turns toward the north pole of the magnet C. The positive part of the object turns toward the south pole of the magnet D. Nothing happens