Star A has an apparent visual magnitude of 6.3 and star B has an apparent visual magnitude of 5.3 . Star A is _________ times (fainter or brighter) than star B
Fill in the blank(s) with correct word
2.51; fainter
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Motional Emf: A conducting rod whose length is ? = 1.60 m is placed on frictionless U-shaped metal rails that is connected to a lightbulb having a resistance of 4.00 ? as shown in the figure. The rails and the rod are in the plane of the page. A constant uniform magnetic field of strength 2.20 T is applied perpendicular to and out of the paper. What is the magnitude of the external applied force needed to move the rod to the right with a constant speed of 6.00 m/s?
A. 8.60 N B. 9.30 N C. 10.6 N D. 12.6 N E. 18.6 N
A 60.0-kg mass person wishes to push a 120-kg mass box across a level floor
The coefficient of static friction between the person's shoes and the floor is 0.700. What is the maximum coefficient of static friction between the box and the floor such that the person can push horizontally on the box and cause it to start moving? A) 0.333 B) 0.500 C) 0.350 D) 0.667 E) 0.700
Tensional forces cause the crust to
A) buckle and fold, thereby shortening the crustal surface. B) buckle and fold, thereby lengthening the crustal surface. C) stretch and pull, thereby shortening the crustal surface. D) break and fracture, thereby lengthening the crustal surface.
Recent measurements of the expansion rate of the universe reveal that the expansion rate of the universe is doing something astronomers did not expect. What is that?
A) The measurements show that the universe may not be expanding at all. B) The measurements show that the universe may be shrinking rather than expanding. C) The measurements show that the expansion is accelerating, rather than slowing under the influence of gravity. D) The measurements indicate that the universe is at least 30 billion years old, meaning that more than 10 billion years passed between the Big Bang and the formation of the first stars and galaxies. E) The data show that the expansion rate varies widely in different parts of the universe.