An electron is sitting on a pinpoint having a diameter of 2.5 mm. What is the minimum uncertainty in the speed of the electron?
23 m/s
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Of the earliest known planets, which exhibits retrograde motion?
A. Mars and Mercury B. only Mars C. Mercury, Venus, and Mars D. All of these choices are correct. E. None of these choices is correct.
Instructions: On occasion, the notation 
= [A, ?] will be a shorthand notation for 
.
Anthony has added the vectors listed below and gotten the result 
. What errors has he made?
?
?
?
A.
.B.
in 
as 
.C.
.D.
E.
A rolling wheel of diameter of 68 cm slows down uniformly from 8.4 m/s to rest over a distance of 115 m. What is the magnitude of its angular acceleration if there was no slipping?
A) 1.8 rad/s2 B) 0.90 rad/s2 C) 5.7 rad/s2 D) 11 rad/s2
Equal but opposite charges Q are placed on the square plates of an air-filled parallel-plate capacitor. The plates are then pulled apart to twice their original separation, which is small compared to the dimensions of the plates
Which of the following statements about this capacitor are true? (There may be more than one correct choice.) A) The capacitance has doubled. B) The electric field between the plates has increased. C) The energy stored in the capacitor has doubled. D) The energy density in the capacitor has increased. E) The potential difference across the plates has doubled.