A particle (charge = +2.0 mC) moving in a region where only electric forces act on it has a kinetic energy of 5.0 J at point A. The particle subsequently passes through point B which has an electric potential of +1.5 kV relative to point A. Determine the kinetic energy of the particle as it moves through point B
a. 3.0 J
b. 2.0 J
c. 5.0 J
d. 8.0 J
e. 10.0 J
b
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As of 2008, most known extrasolar planets have been discovered by
A) the astrometric technique. B) the Doppler technique. C) the transit technique. D) the Hubble Space Telescope.
Thermal Expansion: A solid object has a volume density ?0 at a temperature of 315 K. The coefficient of volume expansion for the material of which it is made is 7.00 × 10-5 K-1. What will be its density (in terms of ?0 at a temperature of 425 K, assuming that it does not melt and that its thermal properties do not change with temperature?
Fill in the blank(s) with the appropriate word(s).
Giant irregulars are the most massive of all known galaxies
Indicate whether the statement is true or false
Which types of galaxies have a clearly defined halo component?
A) spirals only B) ellipticals only C) lenticulars only D) irregulars only E) all but irregulars