An object is placed 12 cm in front of a curved mirror. The magnification of the image is -3.0. What is the focal length of the mirror?
A) 12 cm
B) 9.0 cm
C) 24 cm
D) 36 cm
E) 16 cm
B
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In everyday language, speed and velocity are synonyms, but in physics
A. velocity has only magnitude. B. speed has only direction. C. velocity has magnitude and direction. D. speed has magnitude and direction. E. velocity has only direction.
Suppose that the temperature of the solar nebula had been much colder. How might the Solar System look different today?
A) Terrestrial planets may have formed at a larger distance from the Sun. B) The gas giant planets might be bigger and farther from the Sun. C) The gas giant planets might be bigger and closer to the Sun. D) More planets would have formed.
Where would the aluminum form?
For the following electrolysis reaction: 2 AlOF3-2 + C ? 2 Al + CO2 + F- A) cathode B) anode C) in solution D) Aluminum formation does not happen because electrons do not flow in above reaction. E) none of the above
In a location where the train tracks run parallel to a road, a high speed train traveling at 60 m/s passes a car traveling at 30 m/s in the opposite direction. How long does it take for the train to be 180 m away from the car?
A. 2.0 s B. 3.0 s C. 6.0 s D. 9.0 s E. 18.0 s