If the merger theory is correct, the brightest active galactic nuclei should
A) form small irregular galaxies.
B) contain supermassive black holes.
C) contain the least mass.
D) contain the youngest stars.
E) be in the smallest elliptical galaxies.
B
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Indicate whether the statement is true or false
Thermal Expansion: The coefficient of linear expansion for aluminum is 1.8 × 10-6 K-1. What is its coefficient of volume expansion?
A. 9.0 × 10-6 K-1 B. 5.8 × 10-18 K-1 C. 5.4 × 10-6 K-1 D. 3.6 × 10-6 K-1 E. 0.60 × 10-6 K-1
A circular loop of wire has its radius doubled in time ?t. A uniform magnetic field is at an angle of 60° to the plane of the coil, and the magnetic field halves its intensity in the same time interval ?t. During this interval, what happens to the flux through the coil?
a. It decreases. b. It remains the same. c. It increases. d. More information is needed to make this conclusion.
A plant that is 4.1 cm tall is 10.3 cm from a converging lens. You observe that the image of this plant is virtual and 6.2 cm tall. What is the focal length of the lens?
A) 16 cm B) 30 cm C) -30 cm D) 6.8 cm E) -16 cm