RLC Circuits: A 120-V rms voltage at 60 Hz is applied across a series combination of a 20-?F capacitor and an unknown resistor. If the rms value of the current in the circuit is 0.60 A, what is the resistance of the resistor?
A. 60 ?
B. 120 ?
C. 180 ?
D. 150 ?
E. 200 ?
Answer: D
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A design project requires a TiNi wire to be shaped like the letter S at an operating temperature of 100°C (212°F). The selected TiNi atom arrangement starts to distort at a temperature of 90°C (194°F) and the distortion is finished at a temperature of 60°C (140°F). The wire was drawn straight at a temperature of 500°C (932°F), and the wire supplied is straight. The wire is easily bent into the required S shape at room temperature. What will be the shape of the wire at the operating temperature of 100°C (212°F)?
(a) S shaped (b) C shaped (c) Straight (d) The shape is impossible to know.
Charge of uniform density 90 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 2.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis).
A. 1.9 V B. 1.4 V C. 2.2 V D. 2.8 V E. 4.0 V
A beam of light is incident upon a flat piece of glass (n = 1.50) at an angle of incidence of 60°. Part of the beam is transmitted and part is reflected. What is the angle between the reflected and transmitted rays?
a. 85° c. 107° b. 28° d. 152°
A river has a steady speed of 0.30 m/s. A student swims downstream a distance of 1.2 km and returns to the starting point. If the student swims with respect to the water at a constant speed and the downstream portion of the swim requires 20 minutes, how much time is required for the entire swim?
a. 50 minutes b. 80 minutes c. 90 minutes d. 70 minutes e. 60 minutes