In neutronization of the core, a proton and an electron make a neutron and a(n):
A) positron.
B) muon.
C) neutrino.
D) pion.
E) antineutron.
C
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Sonar is used to determine the speed of an object. A 40.0-kHz signal is sent out, and a 42.0-kHz signal is returned. If the speed of sound is 345 m/s, how fast is the object moving?
A) 6.9 m/s B) 8.4 m/s C) 331 m/s D) 347 m/s
Because of refraction, the Sun near sunset appears
A) higher in the sky. B) lower in the sky. C) farther away.
As shown below, a square loop of wire of side a moves through a uniform magnetic field of magnitude B perpendicular to the page at constant velocity 
directed to the right. Which statement regarding the electric field induced in the wires is correct for the wires at the left and right sides of the loop?
a.
The electric field 
is directed upwards in both the right and left sides of the loop.
b.
The electric field is directed upwards in the right side and downwards in the left side of the loop.
c.
The electric field is directed upwards in the left side and downwards in the right side of the loop.
d.
The electric field is directed downwards in both the right and left sides of the loop.
e.
There is no electric field present in any side of the loop.
At what speed must a 150-kg football player be moving to have the same momentum as a 15.0-g bullet traveling at 300 m/s?
A) 10.0 m/s B) 3.00 cm/s C) 3.00 m/s D) 30.0 m/s E) 1.00 m/s