A magician can make a candle look as if it is burning under water by focusing light from a candle flame burning in air directly on top of an underwater candle. To do this you want to use a (Hint: eliminate those that cannot work.)
a. concave mirror farther than one focal length from the burning candle. b. a convex mirror farther than one focal length from the burning candle. c. a biconcave lens farther than one focal length from the burning candle. d. a concave mirror closer than one focal length to the burning candle. e. a convex lens closer than one focal length to the burning candle.
A
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Which of the following is true of the spiral density wave theory?
A) It explains the formation of stars in self-sustaining star formation regions. B) It establishes that spiral arms are wound up by differential rotation. C) It does not account for the branches and spurs in spiral arms. D) It does not explain the spiral structure of spiral galaxies.
An automobile delivers 30.0 hp to its wheels when moving at a constant speed of 24.0 m/s. What is the resistance force on the automobile at this speed? (1 hp = 746 watts)
a. 5.37E+5 N b. 1.21E+3 N c. 9.33E+2 N d. 3.73E+2 N e. 5.97E+2 N
At the speed of light, how long would it take to go from Earth to the Sun?
a. about a second b. about a minute c. about 8 minutes d. about a day e. about a year
A block is on a frictionless table, on earth. The block accelerates at 3.0 m/ when a horizontal force is applied to it. The block and table are set up on the Moon where the acceleration due to gravity is 1.62 m/
The weight of the block on the Moon is closest to A) 11 N. B) 9.5 N. C) 8.1 N. D) 6.8 N. E) 5.5 N.