If the temperature of a sample of water at 4°C is slightly increased, its volume
A) increases.
B) decreases.
C) remains the same.
Answer: A
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A solenoid of length 18 cm consists of closely spaced coils of wire wrapped tightly around a wooden core. The magnetic field strength is 2.0 mT inside the solenoid near its center when a certain current flows through the coils
If the coils of the solenoid are now pulled apart slightly, stretching it to 21 cm without appreciably changing the size of the coils, what does the magnetic field become near the center of the solenoid when the same current flows through the coils? (?0 = 4? × 10-7 T • m/A) A) 1.7 mT B) 3.4 mT C) 0.85 mT D) 2.0 mT
An object with mass m and moment of inertia I is spinning with an angular momentum L. Its kinetic energy is:
a. 0.5I2/L. b. 0.5L2/I. c. 0.5L2/m. d. 0.5I2/m.
Atoms heavier than helium were at one time manufactured by
A) photosynthesis. B) thermonuclear fusion. C) radiant energy conversion. D) radioactivity. E) none of the above
The function of polarizing filters in viewing 3-D slides or movies is to provide each eye
A) the ability to see parallax. B) a balanced intensity. C) an independent left or right-eye view. D) a stereoscopic view. E) with light polarized at right angles to each other.