In the context of life in the universe, which of the following discoveries of astronomy suggests that enormous numbers of habitable worlds may exist in the universe?
A) the laws of physics are the same everywhere
B) the universe is very old
C) the universe is very large
D) the building blocks of life are common
C
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The velocity of the air with respect to the ground is 50.0 m/s at an angle of 30.0 degrees NORTH of EAST. The velocity of the airplane with respect to the air is 150 m/s at an angle of 60.0 degrees NORTH of EAST. What is the velocity of the airplane with respect to the ground?
A. 158 m/s at 16 degrees NORTH of EAST B. 103 m/s at 29 degrees SOUTH of EAST C. 200 m/s at 30 degrees NORTH of EAST D. 135 m/s at 29 degrees SOUTH of EAST E. 200 m/s at 30 degrees SOUTH of EAST
For luminosity classification, fat stars have skinny spectral lines
Indicate whether the statement is true or false
Waves travel along a 100-m length of string which has a mass of 55 g and is held taut with a tension of 75 N. What is the speed of the waves?
A) 3700 m/s B) 370 m/s C) 37 m/s D) 0.37 m/s E) 3.7 m/s
Unpolarized light is passed through three successive Polaroid filters, each with its transmission axis at 45.0° to the preceding filter. What percentage of light gets through?
a. 0% b. 12.5% c. 25.0% d. 50.0% e. 33.3%