A particle (q = 3.0 mC, m = 20 g) has a speed of 20 m/s when it enters a region where the electric field has a constant magnitude of 80 N/C and a direction which is the same as the velocity of the particle. What is the speed of the particle 3.0 s after it enters this region?
a. 68 m/s
b. 44 m/s
c. 56 m/s
d. 80 m/s
e. 36 m/s
c
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A ball rolls across a floor with an acceleration of 0.10 m/s2 in a direction opposite to its velocity. The ball has a velocity of 4.00 m/s after rolling a distance 6.00 m across the floor. What was the initial speed of the ball?
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A 100-m long transmission cable is suspended between two towers. If the mass density is 2.01 kg/m and the tension in the cable is 3.00 × 10^4 N, what is the speed of transverse waves on the cable?
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What is the power factor for a series ac circuit containing a 50-? resistor, a 10-?F capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?
A) 0.00 B) 0.46 C) 1.0 D) 0.79
In this figure a light ray travels between air and glass. Which way did the light ray go?
 a. from the air into the glass b. from the glass into the air c. either A or B. d. None of the above—this depicts an impossible situation.