The earth\'s crust is broken up into a series of more-or-less rigid plates that

Question

The earth's crust is broken up into a series of more-or-less rigid plates that slide around due to motion of material in the mantle below. Although the speeds of these plates vary somewhat, they are typically about 4.80 .cm/yr Assume that this rate remains constant over time. 1-If you and your neighbor live on opposite sides of a plate boundary at which one plate is moving northward at 4.80 cm/yr with respect to the other plate, how far apart do your houses move in a century? 2-Los Angeles is presently 550 south of San Francisco, but is on a plate moving northward relative to San Francisco. If the 4.80 cm/yr velocity continues, how many years will it take before Los Angeles has moved up to San Francisco?

Explanation / Answer

these are actually very straightforward speed/dist/time problems; make sure in b) to convert to a common set of units

a) dist = speed * time = 4.80 cm/yr x 100yrs = 480 cm

b) time = dist/speed = 550km*1000m/km*100cm/m / 4.80 cm/yr

do the indicated calculations and solve for time

pls rate first. thanks alot

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