The coefficient of linear expansion of aluminum is 24.0 × 10-6 K-1, and the density of aluminum at 0°C is 2.70 × 103 kg/m3. What is the density of aluminum at 300°C?
A) 3.93 × 103 kg/m3
B) 2.73 × 103 kg/m3
C) 2.70 × 103 kg/m3
D) 2.67 × 103 kg/m3
E) 2.64 × 103 kg/m3
E
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This figure shows the Cepheid period-luminosity relation. Suppose that a Cepheid with a period of 30 days has the same apparent brightness as a nearby star with a luminosity identical to our Sun. How many times farther away is the Cepheid? (Hint: First use the graph to find the Cepheid's luminosity, then apply the inverse square law for light.)
A) The Cepheid is 10 times farther away than the nearby star. B) The Cepheid is 100 times farther away than the nearby star. C) The Cepheid is 10,000 times farther away than the nearby star. D) The Cepheid is actually 10 times closer than the nearby star.
An uncharged spherical conducting shell surrounds a charge -q at the center of the shell. Then charge +3q is placed on the outside of the shell. When static equilibrium is reached, the charges on the inner and outer surfaces of the shell are respectively
a. +q, -q. b. -q, +q. c. +q, +2q. d. +2q, +q. e. +3q, 0.
Standing Sound Waves: A pipe of length L that is closed at one end and open at the other end is resonating at its fundamental frequency. Which statement about the sound is correct?
A. The wavelength is 4L and there is a displacement node at the pipe's open end. B. The wavelength is 4L and there is a displacement antinode at the pipe's open end. C. The wavelength is L and there is a displacement node at the pipe's open end. D. The wavelength is L and there is a displacement antinode at the pipe's open end.
Briefly describe the different types of plate boundaries
What will be an ideal response?