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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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.
Plane Mirrors: A person jogs toward a plane mirror at a speed of 3 m/s. How fast is he approaching his image in the mirror?
A. 1 5 m/s B. 3 m/s C. 4 m/s D. 5 m/s E. 6 m/s
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
Which of the following is not a method astronomers use to determine the physical conditions inside the Sun?
A) observing x-ray images of the solar interior using satellites B) building mathematical models that use the laws of physics C) detecting solar neutrinos generated in the Sun's core D) measuring Doppler shifts to observe solar vibrations