The coefficient of friction between a block and the plane is 0.25 (see figure). The minimum horizontal force F (in newtons) required to cause the block to slide up the plane is:
(A) 827
(B) 714
(C) 609
(D) 522
(C) 609
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Which of the following is not a method astronomers use to determine the physical conditions inside the Sun?
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Hubble's law is not applicable to ________ because the motion of these galaxies is affected by ________.
A. galaxies in the Local Group; gravitational interaction with the Milky Way B. distant galaxies; intervening dust C. spiral galaxies; their spiral arms D. elliptical galaxies; their rotation
Rapidly expanding population effectively strangles most efforts to provide adequate
a. education. b. nutrition. c. health care. d. shelter. e. amounts of all the amenities above.