For the following reaction, identify whether the compound in bold is behaving as an acid or a base
H3PO4 + H2O ? H2PO4- + H3O+
A) acid
B) base
C) neither
D) both
E) none of the above
Answer: B
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Magnetic fields are produced by
a. constant electric currents. b. electric currents that vary sinusoidally with time. c. time-varying electric fields. d. all of the above. e. only (a) and (b) above.
A projectile starts at the coordinate origin, where the displacement vector also originates. The initial velocity, v0, makes an angle ?0 with the horizontal where 0
A.
is parallel to 
.B.
is perpendicular to .C.
is parallel to 
.D.
is perpendicular to .E.
is perpendicular to .A 0.330-kg volleyball is thrown vertically downward with a speed of 0.150 m/s. It takes it 0.0655 s to reach the ground. What is the magnitude of its momentum just before it hits the ground?
A) 0.212 kg?m/s B) 0.262 kg?m/s C) 0.163 kg?m/s D) 0.0216 kg?m/s E) 0.0418 kg?m/s
A car approaches a stationary police car at 36 m/s. The frequency of the siren (relative to the police car) is 500 Hz. What is the frequency (in Hz) heard by an observer in the moving car as he approaches the police car? (Assume the velocity of sound in air is 343 m/s.)
a. 220 b. 448 c. 526 d. 552 e. 383