A 90.0 kg person is running up the stairs at 0.500 m/s. The power needed to run up the stairs is
A. 441 Watts.
B. 395 Watts.
C. 302 Watts.
D. 275 Watts.
E. 257 Watts.
A. 441 Watts.
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When dark matter is added, what happens to the speeds of the inner and outer stars?
A.) All the speeds increased the same. B.) The stars near the center slowed down, but the outer ones were accelerated. C.) All the stars sped up, but the outer ones gained the most speed. D.) All were slowed down by the tidal drag of the dark matter. E.) There was no change.
A car travels at a steady 40.0 m/s around a horizontal curve of radius 200 m. What is the minimum coefficient of static friction between the road and the car's tires that will allow the car to travel at this speed without sliding?
A) 1.23 B) 0.816 C) 0.736 D) 0.952 E) 0.662
A 3 kg mass is positioned at (0, 8), and a 1 kg mass is positioned at (12, 0). What are the coordinates of a 4 kg mass which will result in the center of mass of the system of three masses being located at the origin (0, 0)?
A) (-3, -6) B) (-6, -3) C) (3, 6) D) (-12, -8)
Geologic evidence that supports the theory of continental drift does not include
a. glaciation in the Southern Hemisphere. b. drag marks on the ocean floor. c. continuity of geologic structures. d. the discovery of the same fossils on different continents.