If a virtual image is formed 8.00 cm along the principal axis from a convex mirror of focal length –15.0 cm, how far is the object from the mirror?
a. 30.0 cm
c. 3.00 cm
b. 6.00 cm
d. 17.1 cm
D
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The solar wind blew light, gaseous elements out of the inner Solar System.
a. true b. false
Where did the elements heavier than hydrogen and helium come from?
A) They were produced in the Big Bang. B) They evolved from hydrogen and helium shortly after the Big Bang. C) They were produced inside dense interstellar gas. D) They were produced inside stars. E) All of the above
A planet has mass M = 8.00 × 10^23 kg. The centripetal acceleration of an orbiting space station is equal to the gravitational acceleration on Earth's surface. What is the speed of the space station? (G = 6.67 × 10^–11 m3·kg–1·s–2)
a. 7.30 × 10^6 m/s b. 5.34 × 10^13 m/s c. 1.10 × 10^17 m/s d. 1.20 × 10^34 m/s
During the Mesozoic, the supercontinent of Gondwanaland fragmented into the continents of
A) North America, Europe, and Asia. B) South America, Africa, Antarctica/Australia, and India/Madagascar. C) North America, Europe, and Africa. D) South America, Africa, and Europe/Asia.