Cluster ages can be determined from
A) main sequence fitting.
B) main sequence turnoff.
C) pulsating variable stars.
D) spectroscopic binaries.
E) visual binaries.
B
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When a hydraulic press is properly used it is capable of multiplying force input
A) true B) false C) true only in special cases, energy as well
Neon has 10 electrons. What is the value of Z of the next higher element that has chemical properties very similar to those of neon?
A) 11 B) 17 C) 18 D) 19 E) 36
A thin, circular disk of radius 30.0 cm is oriented in the yz-plane with its center at the origin. The disk carries a total charge of +3.00 ?C distributed uniformly over its surface
Calculate the magnitude of the electric field due to the disk at the point x = 15.0 cm along the x-axis. (?0 = 8.85 × 10-12 C2/N ? m2) A) 9.95 × 105 N/C B) 4.98 × 105 N/C C) 3.31 × 105 N/C D) 2.49 × 105 N/C E) 1.99 × 105 N/C
The solar system consists mostly of
A) the Sun. B) the planets. C) the Sun and the planets combined. D) empty space.