In order to understand star clusters, we need to be able to estimate their ages. What technique do scientists use for this?
A) radioisotope dating
B) counting the planets that have formed around the largest stars
C) finding the main-sequence turnoff point of the stars
D) calculating orbital parameters using Kepler's Laws
E) measuring its parallax
C
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According to Pauli's exclusion principle, how many electrons in an atom may have a particular set of quantum numbers?
A) 1 B) 3 C) 2 D) 4 E) 5
A rod system with a uniform linear density of l = 4.40 kg/m has the shape shown in the figure, with rod 1 the vertical rod and rod 2 the horizontal rod. Rod 1 has length L1 = 8.00 m, and rod 2 has length L2 = 7.50 m. Neglect the diameter of the rods
?
What is the center of mass of each rod?
a.
rod 1: (35.20 m, 0), rod 2: (0, 11.73 m)
b.
rod 1: (17.60 m, 0), rod 2: (0, 16.50 m)
c.
rod 1: (2.50, 4.00), rod 2: (3.75 m, 0 m)
d.
rod 1: (10.20 m, 0), rod 2: (0, 9.70 m)
?
The Moon is about one-quarter the diameter of Earth. How does its mass compare?
A. The Moon is 1/81 as massive as Earth. B. The Moon is 1/4 as massive as Earth. C. The Moon is 1/6 as massive as Earth. D. The Moon is 1/32 as massive as Earth.
Kuiper belt objects are small, rocky bodies orbiting beyond Mars
a. True b. False Indicate whether the statement is true or false