Under what circumstances would a nonzero vector lying in the xy plane have components that are equal in magnitude?
1.This can never happen.
2.Always. Components of vectors are always equal in just two dimensions.
3.Only when the vector lies on the x- or y-axes (0°, 90°, 180°, or 270°).
4.Only when the vector lies 45° from the x- or y-axes (45°, 135°, 225°, or 315°).
4
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Brewster's Angle: When light in air strikes the flat surface of a certain glass at 31.2° with the normal, the reflected ray is 100 percent polarized. What is the critical angle for the air-glass interface of this glass?
A. 52.7° B. 58.8° C. 21.4° D. 37.3° E. 68.6°
A 0.150-m-radius grinding wheel starts at rest and develops an angular speed of 12.00 rad/s in 7.80 s. What is the average tangential acceleration of a point on the wheel's edge?
a. 0.231 m/s2 b. 1.54 m/s2 c. 10.3 m/s2 d. 14.0 m/s2
A hot pizza contains __________
Fill in the blank(s) with correct word
Stars with masses between 0.4 and 4
a. undergo thermonuclear fusion of hydrogen and helium, but never get hot enough to ignite carbon. b. undergo thermonuclear fusion of hydrogen, but never get hot enough to ignite helium. c. produce type-I supernovae after they exhaust their nuclear fuels. d. produce type-II supernovae after they exhaust their nuclear fuels. e. undergo carbon detonation.