When SI units are plugged into an equation, it is found that the units balance. Which of the following can we expect to be true for this equation?
a. The equation will be dimensionally correct.
b. The equation will be dimensionally correct except sometimes in cases when the right-hand side of the equation has more than one term.
c. The equation will not be dimensionally correct.
d. All constants of proportionality will be correct.
A
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Rays that pass through a lens very close to the lens axis are more sharply focused than those that are very far from the axis. The inability of a lens to sharply focus off-axis rays is called spherical aberration
This effect helps us to understand why A) we become more farsighted as we grow older. B) we become more nearsighted as we grow older. C) we can see only in black and white in dim light. D) it is easier to read in bright light than in dim light. E) a moving object is more readily detected than a stationary one.
A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the frequency heard by an observer in the truck after the police car passes the truck? (The speed of sound in air is 343 m/s.)
a. 361 b. 636 c. 393 d. 396 e. 383
Carnot Engine: An ideal Carnot heat engine has an efficiency of 0.600. If it operates between a deep lake with a constant temperature of 294.0 K and a hot reservoir, what is the temperature of the hot reservoir?
A. 735 K B. 490 K C. 470 K D. 784 K
A light ray enters a glass enclosed fish tank. From air it enters the glass at 20.° with respect to the surface, then emerges into the water. The index for glass is 1.50 and for water 1.33
(a) What is the angle of refraction in the glass? (b) What is the angle of refraction in the water? (c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection?