Potential: A 4.0-g bead carries a charge of 20 ?C. The bead is accelerated from rest through a potential difference V, and afterward the bead is moving at 2.0 m/s. What is the magnitude of the potential difference V?
A. 800 kV
B. 400 kV
C. 800 V
D. 400 V
E. 200 V
Answer: D
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Intensity: How much energy is transported across a 1.00-cm2 area per hour by a sinusoidal electromagnetic wave whose electric field has a maximum strength of 30.4 V/m? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s)
A. 0.44 nJ B. 0.44 ?J C. 0.44 mJ D. 0.44 J
A ray of light in air enters a glass surface at right angles to the surface. What is the angle of refraction?
A) 90° B) 180° C) 270° D) 360° E) 0°
Two identical fish, both at sea level, float in two identical aquariums with identical quantities of water. Fish A is in Alaska, so it weighs more than fish B at the equator, since g is larger at sea level in Alaska. Which statement is correct?
a. A comparison is impossible unless they are both floating at the same level. b. Fish A displaces a greater quantity of water than fish B. c. Fish B displaces a greater quantity of water than fish A. d. They both displace the same quantity of water. e. Fish A has a smaller acceleration than Fish B when equal horizontal forces are applied to each, because Fish A weighs more.
A 10-A current flows for two minutes. (a) How much charge has passed through this circuit? (b) How many electrons have passed any point in the circuit?
What will be an ideal response?