The uncertainty principle tells us that the more information one has about the energy of an electron, the less certain one is about
A) its position.
B) the time it has that energy.
C) both of these
D) neither of these
Answer: B
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When you blow air between a pair of closely-spaced Ping-Pong balls suspended by strings, the balls will swing
A) toward each other. B) away from each other. C) away from the air stream, but not necessarily toward or away from each other.
What is the most abundant mineral in Earth's crust? What is the second most abundant mineral?
What will be an ideal response?
You push an object, initially at rest, across a frictionless floor with a constant force for a time interval, ?t, which results in a final speed of v for the object. You repeat the experiment, but with a force that is half as large. What time interval is now required to reach the same final speed?
1. 4?t 2. ?t 3. ?t/2 4. 2?t
In a steady flow in a long pipe, such as the Alaska oil pipe line, the Eulerian description of the velocity field would express the velocity V in the pipe as:
(A) V(t) (B) V(r) (C) V(r, t) (D) V(r, z)