According to quantum theory,
A) individual microscopic events are inherently unpredictable.
B) nature is "non-local," i.e., instantaneously connected across a distance.
C) Both of the above.
D) the overall statistics of large numbers of microscopic events are inherently unpredictable.
E) All of the above.
C
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A mass attached to a vertical spring causes the spring to stretch and the mass to move downwards. What can you say about the spring's potential energy (PEs) and the gravitational potential energy (PEg) of the mass?
a) both PEs and PEg decrease b) PEs increases and PEg decreases c) both PEs and PEg increase d) PEs decreases and PEg increases e) PEs increases and PEg is constant
The power of an engine is a measure of
A. the total amount of work it can perform. B. its volume. C. its ability to outperform a horse. D. the rate at which it can perform work.
To increase the current density in a wire of length l and diameter D, you can
a. decrease the potential difference between the two ends of the wire. b. increase the potential difference between the two ends of the wire. c. decrease the magnitude of the electric field in the wire. d. heat the wire to a higher temperature. e. combine both (b) and (d).
Consider a situation where you carry a 20 N box up a flight of stairs, raising its elevation by 5 m. The work you do is
a. 0 c. 100 J b. 4 J d. none of the above