Which of the following correctly lists our "cosmic address" from small to large?
A. Earth, solar system, Milky Way Galaxy, Local Group, Local Supercluster, universe;
B. Earth, solar system, Local Group, Local Supercluster, Milky Way Galaxy, universe;
C. Earth, Milky Way Galaxy, solar system, Local Group, Local Supercluster, universe.
Ans: A. Earth, solar system, Milky Way Galaxy, Local Group, Local Supercluster, universe;
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Block A of mass 5.0 kg and block X are attached to a rope which passes over a pulley, as shown in the figure. An 80-N force P is applied horizontally to block A, keeping it in contact with a rough vertical face
The coefficients of static and kinetic friction between the wall and block A are ?s = 0.40 and ?k = 0.30. The pulley is light and frictionless. The mass of block X is adjusted until block A moves upward with an acceleration of 1.6 m/s2. What is the mass of block X? A) 9.9 kg B) 9.3 kg C) 8.7 kg D) 8.1 kg E) 7.5 kg
How do the size and mass of Jupiter's core compare to the size and mass of Earth?
A) It is the same size and mass. B) It is about 10 times larger in size and the same mass. C) It is about the same size but is 10 times more massive. D) It is about 10 times larger both in size and mass. E) Jupiter doesn't have a core—it is made entirely from hydrogen and helium.
To decrease the intensity of the sound you are hearing from your speaker system by a factor of 36, you can
a. reduce the amplitude by a factor of 12 and increase your distance from the speaker by a factor of 3. b. reduce the amplitude by a factor of 4 and increase your distance from the speaker by a factor of 3. c. reduce the amplitude by a factor of 2 and increase your distance from the speaker by a factor of 3. d. reduce the amplitude by a factor of 3 and increase your distance from the speaker by a factor of 4. e. reduce the amplitude by a factor of 3 and increase your distance from the speaker by a factor of 12.
When ultraviolet light reflects from a violet surface, we see
A. red. B. black. C. violet. D. white.