A current-carrying 2.0-cm long segment of wire is inside a long solenoid (radius = 4.0 cm, n = 800 turns/m, current = 50 mA). The wire segment is oriented perpendicularly to the axis of the solenoid. If the current in the wire segment is 12 A, what is the magnitude of the magnetic force on this segment?
a. 22 ?N
b. 16 ?N
c. 18 ?N
d. 12 ?N
e. 0 ?N
d
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A 400-g piece of metal at 120.0°C is dropped into a cup containing 450 g of water at 15.0°C. The final temperature of the system is measured to be 40.0°C
What is the specific heat of the metal, assuming no heat is exchanged with the surroundings or the cup? The specific heat of water is 4190 J/(kg?K). A) 1470 J/(kg ? K) B) 2830 J/(kg ? K) C) 3420 J/(kg ? K) D) 3780 J/(kg ? K) E) 4280 J/(kg ? K)
Democritus said that, although we imagine many things, "in reality, there are only atoms and the void." This idea could best be classified as
A) witticism. B) stoicism. C) rationalism. D) idealism. E) materialism.
The coil in a 60-Hz ac generator has an area of 3.0 × 10-2 m2 and is rotated in a 0.12 T magnetic field. The coil has 125 turns. What is the peak output voltage of this generator?
A) 170 V B) 120 V C) 200 V D) 110 V E) 220 V
A plot of the continuous spectra of five different stars is shown in the figure. Based on these spectra, which of the stars has the lowest temperature?
a. Star A
b. Star B
c. Star C
d. Star D
e. Star E