It can be shown that the approximate age of the universe is 1/H, where H is the Hubble constant. Taking H = 20 km/s/Mly, estimate the age of the universe, in years
A)
1500 years
B)
15 thousand years
C)
15 million years
D)
15 billion years
E)
15 trillion years
D
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The three bright stars that make up the Winter Triangle are
A) Polaris, Aldebaran, and Algol. B) Polaris, Betelgeuse, and Sirius. C) Betelgeuse, Procyon, and Sirius. D) Betelgeuse, Rigel, and Aldebaran. E) Capella, Procyon, and Sirius.
A woman looking in a makeup mirror sees her face at twice its actual size and right-side up. If she is 22.0 cm from the mirror, what is its focal length?
a. 44.0 cm c. 18.6 cm b. 48.3 cm d. 56.0 cm
The {100} planes of a cubic unit cell form the ______________of the cube.
Fill in the blank(s) with the appropriate word(s).
If you hear a tree fall, you know:
a. that the momentum of the tree was conserved in the collision. b. that the tree hitting the ground was an elastic collision. c. that the tree hitting the ground was an inelastic collision. d. that kinetic energy increased when the tree hit the ground. e. that kinetic energy was unchanged when the tree hit the ground.