If an electron is accelerated from rest through a potential difference of 1500 V, what speed does it reach? (e = 1.60 × 10-19 C , melectron = 9.11 × 10-31 kg)
A) 2.3 × 107 m/s
B) 1.9 × 107 m/s
C) 1.5 × 107 m/s
D) 1.1 × 107 m/s
A
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Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?
A) The star is a member of a binary star system. B) The star is of spectral type G. C) The star is of spectral type A. D) We know the star's luminosity and distance.
When a pair of 10-N forces act on a box of candy, the net force on the box is
A) zero. B) about 14 N. C) 20 N. D) Any of the above depending on the directions of forces.
In addition to the proper motion, we also need the ________ to find the transverse velocity of a star across our line of sight
A) mass B) temperature C) composition D) parallax E) color