Three identical point charges (+2.0 nC) are placed at the corners of an equilateral triangle with sides of 2.0-m length. If the electric potential is taken to be zero at infinity, what is the potential at the midpoint of any one of the sides of the triangle?
a. 16 V
b. 10 V
c. 70 V
d. 46 V
e. 44 V
d
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Suppose that you measure the parallax angle for a particular star to be 0.1 arcseconds. What is the distance to this star? (Hint: A star at a distance of 3.26 light-years has a parallax angle of 1.0 arcseconds.)
A) 0.1 light-years B) 0.326 light-years C) 10 light-years D) 32.6 light-years E) 3.26 light-years
The Kuiper Belt is:
A) another name for the Asteroid Belt. B) a band of icy planetesimals found beyond Neptune's orbit. C) where all comets come from. D) the name given to icy bodies found between Jupiter and Saturn. E) the name given to icy bodies found between Mars and Jupiter.
Of the following energies for photons, which is the least energy that could result in photoelectron production if the work function is 1.60 eV?
a. 1.50 eV c. 2.90 eV b. 6.01 eV d. 3.50 eV
A horizontal disk with a radius of 10 cm rotates about a vertical axis through its center. The disk starts from rest at t = 0 and has a constant angular acceleration of 2.1 rad/s2 . At what value of t will the radial and tangential components of the linear acceleration of a point on the rim of the disk be equal in magnitude?
a. 0.55 s b. 0.63 s c. 0.69 s d. 0.59 s e. 0.47 s