A certain brand of hot dog cooker applies a potential difference (120 V) to opposite ends of the hot dog and cooks by means of the joule heat produced. If 60 kJ is needed to cook each hot dog, what current is needed to cook four hot dogs simultaneously in 3.0 min?
a.
11 A
b.
2.8 A
c.
8.3 A
d.
2.1 A
e.
3.6 A
a
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The frequency separating audible waves and ultrasonic waves is considered to be 15.0 kHz. What wavelength in air at room temperature is associated with this frequency? (Assume the speed of sound to be 225 m/s.)
a. 1.50 cm b. 33.8 cm c. 22.5 cm d. 33.8 cm e. 33.8 cm
What size capacitor should be placed in series with a 30-? resistor and a 40-mH inductive coil if the resonant frequency of the circuit is to be 1.0 kHz?
A) 3.3 µF B) 0.63 µF C) 6.0 µF D) 4.5 µF E) 2.0 µF
Which of the following will affect the vertical speed of a segment of rope that has a wave propagating along it?
1.The speed of a transverse wave along a rope. 2.The amplitude of a transverse wave along a rope. 3.The frequency of a transverse wave along a rope. 4.All of these.
The magnitude of the charge on each plate of a parallel plate capacitor is 4 ?C and the potential difference between the plates is 80 V. What is the capacitance of this capacitor?
A) 0.1 × 10-6 F B) 300 × 10-6 F C) 100 × 10-6 F D) 20 × 10-6 F E) 5 × 10-8 F