A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation 5 m above ground level. The ball lands 20 m downrange. The player's pitching speed is about
A) 5 m/s.
B) 10 m/s.
C) 20 m/s.
D) 25 m/s.
E) none of the above
Answer: C
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A flat circular loop of wire is in a uniform magnetic field of 0.30 T. The diameter of the loop is 1.0 m, and a 2.0-A current flows in it
What is the magnitude of the magnetic torque on the loop when the plane of the loop is parallel to the magnetic field? A) 0.47 N ? m B) 0.52 N ? m C) 0.41 N ? m D) 0.00 N ? m
Suppose we imagine the Sun to be about the size of a grapefruit. Which of the following best describes the size and distance of Earth on the same scale?
A) Earth is the size of a tip of a ballpoint pen about 1 meter from the Sun. B) Earth is the size of a golf ball about 1 meter from the Sun. C) Earth is the size of a tip of a ballpoint pen about 15 meters from the Sun. D) Earth is the size of a golf ball about 15 meters from the Sun. E) Earth is the size of a marble about 25 miles from the Sun.
What do we mean by fnow in the Drake equation
(Number of Civilizations = NHP × flife × fcivilization × fnow)? A) the fraction of planets with civilizations on which the civilizations exist now B) the fraction of time since the Big Bang represented by the present era C) the fraction of all species ever to exist that we currently are aware of D) the fraction of planets in the galaxy on which a civilization could theoretically develop now E) the fraction of civilizations in the universe that currently are sending messages to us
Point charges q and Q are positioned as shown. If q = +2.0 nC, Q = ?2.0 nC, a = 3.0 m, and b = 4.0 m, what is the electric potential difference, VA ? VB?
a.
8.4 V
b.
6.0 V
c.
7.2 V
d.
4.8 V
e.
0 V