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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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.
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