Snell's Law: A thin flashlight beam traveling in air strikes a glass plate at an angle of 52° with the plane of the surface of the plate. If the index of refraction of the glass is 1.4, what angle will the beam make with the normal in the glass?
A. 34°
B. 64°
C. 26°
D. 56°
E. 38°
Answer: C
Physics & Space Science
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Steel beams each 10 m in length at 25°C are used in a bridge design. The design temperature range is from –20°C to 30°C. The coefficient of linear expansion for the steel is 12.5 × 10–6 °C–1 . Calculate the total change of length possible for the beams in this design.
What will be an ideal response?
Physics & Space Science
When did there first start to be four separate forces?
A: 10^43 seconds B: 10^34 seconds C: 10^12 seconds D: 1 second E: 100 seconds
Physics & Space Science
The Milky Way can be seen only from the Northern Hemisphere
Indicate whether the statement is true or false
Physics & Space Science
At what point is the Moon closest to Earth?
a. apogee b. perigee c. umbra d. penumbra e. prominence
Physics & Space Science