A galaxy supercluster typically contains a few thousand clusters of galaxies.
Answer the following statement true (T) or false (F)
False
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If the Sun's core suddenly shrank a little bit, what would happen in the Sun?
A) The core would cool off and continue to shrink as its density increased. B) The density of the core would decrease, causing the core to cool off and expand. C) The core would heat up, causing it to radiate so much energy that it would shrink even more. D) The core would heat up, fusion rates would increase, and the core would re-expand.
Three resistors, each with resistance R1, are in series in a circuit. They are replaced by one equivalent resistor, R. Comparing this resistor to the first resistor of the initial circuit, which of the following is true?
a. The current through R equals the current through R1. b. The voltage across R equals the voltage across R1. c. The power given off by R equals the power given off by R1. d. R is less than R1.
What number of turns on the secondary is needed to reduce the voltage from 120 V to 9.0 V if there are 40 turns on the primary of a step down transformer?
A. 3 B. 9 C. 18 D. 120 E. 530
Nuclear fusion is the process by which
A) electrons are rearranged inside an atom, releasing energy B) a number of smaller nuclei combine to form a larger nucleus with the release of energy C) an electron is ejected from the nucleus of an atom, releasing energy D) large nuclei break up into smaller nuclei with the release of energy