According to the nebular theory, as an interstellar cloud forms a new star and planetary system it
A) expands, cools down, and spins slower
B) contracts, heats up, and spins faster
C) expands, cools down, and spins faster
D) contracts, heats up, and spins slower
B
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Electric Field of Point-Charges: Three equal-magnitude point charges of varying signs are placed at the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the center of the square?
A. A B. B C. C D. D
Scientists hypothesize that a process of chemical evolution eventually concentrated various small molecules into the most stable larger forms
Indicate whether the statement is true or false
Mass and Weight: The acceleration due to gravity is lower on the Moon than on Earth. Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?
A. Mass is less, weight is the same. B. Mass is the same, weight is less. C. Both mass and weight are less. D. Both mass and weight are the same.
A guitar string is played together with a tuning fork whose frequency is 256 Hz, and beats of 2 Hz are heard. In such a case, if initially the tension in the string is 150 N, what must the new tension be, assuming the guitar string is initially higher in frequency than the tuning fork?
A. 148 N B. 149 N C. 151 N D. 152 N E. The length of the string must be given in order to solve this problem.