A horizontal force of 850 N is needed to overcome the force of static friction between a level floor and a 350-kg crate. If g = 9.8 m/s2, what is the coefficient of static friction?
a. 24.8
b. 2.48
c. 4.04
d. 0.248
e. 2.43
d
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The atmosphere of ____________________ contains acid compounds including sulfuric and hydrochloric acid
Fill in the blank(s) with correct word
During a period of high solar activity, most sunspots lie near the Sun's ________
Fill in the blank(s) with correct word
Melanie says that when a diver enters an underwater cave of height h, the pressure on her is no greater than rWgh. Rosalind says that if the bottom of the cave is a distance H below the water surface, the pressure on the soles of the diver's feet can reach rWgH. Which one, if either, is correct? (The density of water is rW.)
a. Melanie, because the roof of the cave absorbs the water pressure from above. b. Melanie, because only the fluid directly above any volume of the fluid can contribute to the pressure on that volume. c. Rosalind, because a fluid exerts equal pressure in all directions at a given depth. d. Rosalind, because the pressure also depends on the density, rc, of the material above the cave roof, so that p = rcg(H - h) + rWgh. e. Melanie, because the pressure equals p = rWgH - rcg(H - h).
Triton's source of internal heat is mostly associated with
A) tidal heat associated with its elliptical orbit around Neptune B) tidal heat left over from it being captured into orbit around Neptune C) radioactive decay D) heat left over from its formation