What is the power of a lens that has a focal length of -40 cm?
A) -2.5 diopters
B) -4.0 diopters
C) +4.0 diopters
D) +2.5 diopters
E) +2.7 diopters
A
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Suppose a particular star has a core that is undergoing several stages of fusion simultaneously, as shown in this diagram. Which of the following statements about this star is most likely to be true?
A) The star will explode as a supernova within a few days. B) The star was born from a gas cloud with an unusually large proportion of elements heavier than hydrogen and helium. C) The star is a red giant. D) A million years from now, all that will remain of this star is a white dwarf.
The Jovian planets have lower average densities than the terrestrial planets
Indicate whether the statement is true or false
A resistor, an uncharged capacitor, a dc voltage source, and an open switch are all connected in series. The switch is closed at time t = 0 s. Which one of the following is a correct statement about this circuit?
A) The charge on the capacitor after one time constant is 1/e of its maximum value. B) The voltage on the capacitor after one time constant is 1/e of the maximum value. C) The voltage on this capacitor after one time constant is 100% of its maximum value. D) The charge on the capacitor after four time constants is about 98% of the maximum value. E) The charge on the capacitor after one time constant is 50% of its maximum value.
Aerobic organisms first started building up oxygen in the Earth's atmosphere around
A) 4.6 billion years ago B) 3.5 billion years ago C) 4.0 billion years ago D) 2.5 billion years ago