An uncharged, series RC circuit is connected across a battery. For which situation will the time for the capacitor to reach 90% of its final charge remain unchanged?
a. The RC time constant is doubled
b. The battery voltage is doubled.
c. A second resistor is added in series with the original resistor.
d. All of these situations result in the time for the capacitor to reach 90% of its final charge to change.
b
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In which of the following cases is the displacement's magnitude half the distance traveled?
a. 10 steps east followed by 3 steps west b. 28 steps east followed by 14 steps west c. 6 steps east followed by 24 steps west d. 12 steps east followed by 4 steps west e. 5 steps east followed by 25 steps west
____________ are Kuiper belt objects that are in a 3:2 resonance orbit with the orbit of Neptune
a. Plutinos b. Charons c. Protons d. Lepton e. Resonons
Suppose that you stand, motionless, on the floor. Regarding the force by the floor on your feet,
A) there is an upward force by the floor on your feet, and this force causes you to accelerate upwards. B) as long as you remain motionless, there is no force by the floor on your feet. C) there is an downward force by the floor on your feet, even though you are not accelerating. D) there is a downward force by the floor on your feet, and this force causes you to accelerate downwards. E) there is an upward force by the floor on your feet, even though you are not accelerating.
If a star exhibits no Doppler shift in its emitted light, it must be true that ________.
A. the star is neither moving toward nor away from Earth B. the star is not moving relative to Earth C. the star does not emit much visible light D. the star only displays proper motion