A particle (charge = 5.0 ?C) is released from rest at a point x = 10 cm. If a 5.0-?C charge is held fixed at the origin, what is the kinetic energy of the particle after it has moved 90 cm?
a. 1.6 J
b. 2.0 J
c. 2.4 J
d. 1.2 J
e. 1.8 J
b
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The position of a ball rolling in a straight line is given by x=2.0-3.6t +1.1 t2, where x is in meters and t in seconds.
(a) Determine the position of the ball at t=1.0s, 2.0s and 3.0s. (b) What is the average velocity over the interval t=1.0s to t=3.0s? (c) What is its instantaneous velocity at t=2.0s and at t=3.0s?
A standard candle is
A) a 7-cm-long wax candle. B) a light source of known luminosity. C) another name for a main-sequence star. D) another name for a barred-spiral galaxy.
One energy source for brown dwarfs is:
A) hydrogen fusing to helium. B) helium fusing to carbon. C) iron core collapse. D) helium-3 fusing to helium-4. E) deuterium fusing to helium-3.
A uniform thin wire has a length 
and is bent into a semicircular arc of radius R. If the wire starts at (x, y) = (R, 0) and curves counterclockwise to (x, y) = (?R, 0), what is the y coordinate of its center of mass?
What will be an ideal response?