Electromagnetic waves are generated whenever the ____
a. motion of any particle is changed
b. motion of any charged particle changes
c. motion of a positively charged particle is changed
d. motion of a negatively charged particle is changed
e. acceleration of any charged particle is changed
Ans: b. motion of any charged particle changes
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In a velocity selector consisting of perpendicular electric and magnetic fields, the speeds of the charged particles passing through the selector are increased or decreased until they are equal to the desired speed
A) True B) False
A 3.0-kg block is on a horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 12 N) acting parallel to the surface is applied to the block causing it to accelerate. The coefficient of kinetic friction between the block and the surface is 0.20 . At what rate is the force P doing work on the block at t = 2.0 s?
a. 54 W b. 49 W c. 44 W d. 59 W e. 24 W
The brakes in a car work because of Pascal's principle
Indicate whether the statement is true or false
Maximum specific humidity is an ideal way to express capacity, because specific humidity
A) does not change as air expands or contracts. B) is a mass measurement—grams/kilograms. C) is the mass of water vapor per volume of air. D) is the pressure exerted by water vapor.