Specific Heat: If you wanted to know how much the temperature of a particular piece of material would rise when a known amount of heat was added to it, which of the following quantities would be most helpful to know?
A. initial temperature
B. specific heat
C. density
D. coefficient of linear expansion
E. thermal conductivity
Answer: B
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A charge of +3.0 ?C is distributed uniformly along the circumference of a circle with a radius of 20 cm. How much external energy is required to bring a charge of 25?C from infinity to the center of the circle?
A. 5.4 J B. 3.4 J C. 4.3 J D. 2.7 J E. 6.8 J
A 120-V rms voltage at 1000 Hz is applied to a resistor and an inductor in series. If the impedance of this circuit is 110 ?, what is the maximum value of the current?
A) 1.54 A B) 1.09 A C) 1.84 A D) 1.04 A E) None of the other answers is correct.
An electric device, which heats water by immersing a resistance wire in the water, generates 50 cal of heat per second when an electric potential difference of 12 V is placed across its leads. What is the resistance of the heater wire? (Note: 1 cal = 4.186 J)
a. 0.94 W b. 0.81 W c. 0.58 W d. 0.69 W e. 1.5 W
Jupiter lies about 5 AU from the Sun, so at its distance
A) the Sun's gravity is just as strong as it is here at Earth. B) the Sun's gravity must be five times stronger to hold massive Jupiter in orbit. C) the Sun's gravity is five times weaker there than at one AU distance. D) the Sun's gravity is 25 times weaker than its pull on the Earth. E) the Sun's gravity is so weak that ultimately Jupiter will escape the solar system.