Based on its abundance in Earth's crust, most rocks contain a mineral composed of the elements oxygen and
A) carbon.
B) silicon.
C) iron.
D) sulfur.
Answer: B
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Why is the distribution of the globulars significant?
A: It helps in determining the distances to the globulars B: It helps to show that the Sun is at the center of the Milky Way C: Spherical symmetry indicates the position of the Milky Way center D: It helps us understand more about variable stars E: It really isn't significant- they are randomly distributed throughout the whole Milky Way
A 1.7-m tall woman stands 8.0-m in front of a camera with a 5.0-cm focal length lens. What is the size of the image formed on film?
a. 23.5 cm b. 2.7 cm c. 1.1 cm d. 68.0 cm e. 0.37 cm
Melanie says that when a diver enters an underwater cave of height y, the pressure on her is no greater than ?Wgy. Rosalind says that if the bottom of the cave is a distance Y below the water surface, the pressure on the soles of the diver's feet can reach ?WgY. Which one, if either, is correct? (The density of water is ?W.)
A. Melanie, because the roof of the cave absorbs the water pressure from above. B. Melanie, because only the fluid directly above any volume of the fluid can contribute to the pressure on that volume. C. Rosalind, because a fluid exerts equal pressure in all directions at a given depth. D. Rosalind, because the pressure also depends on ?c, density of the material above the cave roof, so that p =?cg(Y-y) +rWgy. E. Melanie, because the pressure equals p = ?WgH??cg(H?h).
A pulsar emits bursts of radio photons
a. True b. False Indicate whether the statement is true or false