A proton moves around a circular path (radius = 2.0 mm) in a uniform 0.25-T magnetic field. What total distance does this proton travel during a 1.0-s time interval? (m = 1.67 × 10^?27 kg, q = 1.6 × 10^?19 C)
a. 82 km
b. 59 km
c. 71 km
d. 48 km
e. 7.5 km
d
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The power required to exert 4-N force over 3 meters in 2 seconds is
A) 4 W. B) 6 W. C) 8 W. D) 12 W. E) none of the above
Aristotle believed that natural laws could be understood by _______. In contrast to Aristotle's way of explaining nature, Galileo relied on __________.
A. logic; experiment B. experiment; logic C. mathematics; patterns D. patterns; mathematics
A point charge Q is placed on the x axis at the origin. An identical point charge is placed on the x axis at x = ?1.0 m and another at x = +1.0 m. If Q = 40 ?C, what is the magnitude of the electrostatic force on the charge at x = +1.0 m?
A. 29 N B. 14 N C. 11 N D. 18 N E. 7.0 N
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