Estimate the mass of water on the earth. The density of water is 1000kg cubic meter. Give answer to 1 significant figure. There are some approximations that can be use:
compared with the oceans, lakes and rivers are tiny. Clouds have very low density. There is (still) lots of ice in the the polar regions , but much less area which covers roughly 2/3 of the earth. Looking at the charts of the oceans , we see that the depth is typically several thousand meters (and a serious search tells me the average depth is 4700m) .The radius of the earth is about 6000km .The surface area of a sphere is 4piR².
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Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.
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If we relied solely on the nonrenewable resources found in the u.s., which one would we run out of first at current usage levels? a. natural gas b. oil c. uranium d. coal
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Physics, 22.06.2019 12:00
Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?
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Estimate the mass of water on the earth. The density of water is 1000kg cubic meter. Give answer to...
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