Two lenses, the first with focal length 10.0 cm and the second with focal length -12.5 cm, are separated by 20.0 cm. An object, 2.40 cm tall, is 15.0 cm in front of the first lens. Which of the following characteristics does the final image have?
A. real and upright
B. real and inverted
C. virtual and upright
D. virtual and inverted
E. virtual and diminished in size
B. real and inverted
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If the Earth rotated on its axis more slowly than it does now:
A) its months would be longer B) its years would be shorter C) its days would be shorter D) its days would be longer E) its months would be shorter
One way to probe the rate of nuclear reactions in the center of the Sun is by studying ________ produced because ________.
A. neutrinos; they pass out of the Sun without undergoing a random walk B. positrons; they annihilate into gamma rays of very specific energies C. wave motions; they can be measured at the Sun's surface D. heavy hydrogen; it has different spectral lines than normal hydrogen
The Sun exerts a greater gravitational force on the Earth than the moon does, yet the moon is primarily responsible for the tides, why is this so?
A. Nonsense, the moon is closer, so the gravitational force it exerts is stronger than the Sun’s. B. Nonsense, the Sun is responsible for the tides C. Tides are only created when the Sun and moon line up D. Because the variation of the gravitational force on the different sides of the Earth is greater due to the moon’s shorter distance from Earth.
A hurricane watch is issued when
a. a tropical storm begins to form. b. a hurricane has been sighted. c. a storm surge has hit the coast. d. there is a threat of hurricane conditions within 24 to 36 h.