A glass plate whose index of refraction is 1.56 is immersed in a liquid. The surface of the glass is inclined at an angle of 42.0° with the vertical. A horizontal ray in the glass is incident on the interface
When the liquid is a certain alcohol, the incident ray arrives at the interface at the critical angle. What is the index of refraction of the alcohol? A) 1.04
B) 1.02
C) 1.00
D) 0.984
E) 1.06
A
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Sally, who weighs 450 N, stands on a skate board while Roger pushes it forward 13.0 m at constant velocity on a level straight street. He applies a constant 100 N force
a. The work Roger does on the skateboard is 0 J. b. The work Roger does on the skateboard is 1 300 J. c. The work Sally does on the skateboard is 1 300 J. d. The work Sally does on the skateboard is 5 850 J. e. The work Roger does on the skateboard is 5 850 J.
Enough brown dwarfs have been found to account for most of the dark matter present in galaxies
Indicate whether the statement is true or false
In ultrasonic nondestructive testing with the pulse echo technique, a crack is detected by the _________ultrasonic waves.
Fill in the blank(s) with the appropriate word(s).
Two planets have the same surface gravity, but planet B has twice the mass of planet A. If planet A has radius r, what is the radius of planet B?
A) r B) r C) 2r D) 4r E) r/