Monochromatic light (? = 500 nm) is incident on a soap bubble (n = 1.4) that is 50 mm thick. What is the change of phase of the light reflected from the front surface?
a. 0
b. 180°
c. ?/2
d. ?/2
e. 55°
b
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Imagine that a certain engine can cause the road to exert a certain maximum forward force on a certain car. If we change the car’s design to reduce its drag coefficient by a factor of 2, by what factor will the car’s maximum speed increase (other things being equal)?
A. No increase B. 1.41 C. 2 D. 4 E. Depends (specify) F. Other (specify)
The expression that mathematically describes the force between two static electric charges is called ______________
Fill in the blank(s) with correct word
Which subatomic particle or particles is/are found in the nucleus of an atom?
A) protons and neutrons B) protons only C) neutrons and electrons D) electrons and protons
An auto weighing 3000 newtons has a forward drive force of 1000 newtons. Air resistance on the car is 100 newtons, and road resistance is 100 newtons. The auto moves along a straight level road. The force due to gravity acting on the auto is
A) 800 newtons upward. B) 4200 newtons downward. C) 3000 newtons upward. D) zero. E) 3000 newtons downward.