Which numbered position in the figure shows a planet at opposition?
A) 1
B) 2
C) 3
D) 4
D) 4
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A force of 15 N toward the WEST is applied to a 4.0 kg box. Another force of 42 N toward the EAST is also applied to the 4.0 kg box. The net force on the 4.0 kg box is
A. 57 N toward the WEST. B. 27 N toward the EAST. C. 36 N toward the WEST. D. 36 N toward the EAST. E. 17 N toward the WEST.
How would sunspots appear if you could magically remove them from the Sun?
A) They would appear blue-white, like Sirius but brighter. B) Because sunspots are dark spots, they would be invisible against the blackness of space. C) They would shine bright orange in color, like Arcturus. D) They would not appear any differently than on the surface of the Sun. E) They would shine only with reflected sunlight, appearing similar to Venus.
Cosmic inflation caused the universe to expand, for a brief period, at faster than lightspeed. But special relativity says that nothing can move faster than lightspeed. How can this contradiction be resolved?
A) The laws of physics (conservation of energy, special relativity, etc.) as we presently know them were not valid during the "inflationary period" that existed for a fraction of a second into the big bang. B) We now realize that special relativity does not apply to dark energy. C) Special relativity says nothing can move through space at faster than lightspeed, but doesn't restrict the speed at which space can expand. D) It hasn't yet been resolved, but scientists are working on resolving it. E) The laws of specially relativity were not valid during the inflationary period, but the other laws (such as conservation of energy) were valid.
A force of 5.0 N is applied to a 20-kg mass on a horizontal frictionless surface. As the speed of the mass increases at a constant acceleration, the power delivered to it by the force:
a. remains the same. b. increases. c. decreases. d. doubles every 4.0 seconds.