A buoyant force acts on
A) gas-filled balloons.
B) you and your classmates.
C) both of these
D) neither of these
Answer: C
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What happens in the double-slit experiment with electrons if we place an electron detector just behind one of the slits?
A) This tells us which slit each electron comes through, and has no effect on the pattern formed on the screen. B) This tells us which slit each electron comes through, but it also changes the pattern formed on the screen. C) This provides no information concerning which slit each electron comes through, but it does change the pattern formed on the screen. D) This provides no information concerning which slit each electron comes through, and has no effect on the pattern formed on the screen. E) We can then predict the precise point at which the electron will strike the screen.
A galvanometer measures
A) magnetic fields. B) electric current. C) electric voltage. D) none of the above
What is the only lasting "cloudmark" for telescopic observers of Jupiter, and what do we know about its past?
What will be an ideal response?
A block of wood has specific gravity 0.80 . When placed in water, what percent of the volume of the wood is above the surface?
a. 0, the block sinks. b. 20% c. 80% d. 50% e. 100%