A string is attached to the ceiling. At the bottom of the string a rope of the same length as the string is attached. In the rope-string system, which of the following is the position of greatest tension? Assume the rope has more mass per unit length than the string
a. at the bottom of the rope
b. at the top of the rope where it is attached to the string
c. at the bottom of the string where it is attached to the rope
d. at the top of the string
D
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The resistivity of a material is doubled when heated a certain amount. What happens to the resistance of a resistor made of this material when heated the same amount?
a. It doubles. b. It quadruples. c. It halves. d. It stays the same.
Approximately how long have cosmic microwave background photons been traveling through space?
A) 5000 years B) 380,000 years C) 14 billion years D) It depends on which direction they come from.
Exclusion Principle: An atom with atomic number 6 is in its ground state. How many electrons are in its outermost shell?
Fill in the blank(s) with the appropriate word(s).
The surface gravity of Jupiter is only 2.5 times larger than Earth's, despite the fact that Jupiter's mass is more than 300 times that of Earth. How can this be?
A. Jupiter has no surface, so it does not have a surface gravity. B. The radius of Jupiter is much larger than Earth's, so a point in the cloud tops of Jupiter is farther from its center. C. Jupiter is mostly hydrogen and helium, while Earth is mostly iron and rock. D. The radius of Earth is 300 times smaller than the radius of Jupiter.