15. Under certain conditions, the human body can safely withstand an acceleratio

Question

15. Under certain conditions, the human body can safely withstand an acceleration of 8g. What net force would have to act on someone with mass of 60kg to cause this acceleration?
16. On a highway curve with radius 80m, the maximum force of static friction (centripetal force) that can act on a 1,000kg car going around the curve is 8,000N. What speed limit should be posted for the curve so that cars can negotiate it safely?
17. A centripetal force of 250N acts on a 1,000kg satellite moving with a speed of 5,000m/s in a circular orbit around a planet. What is the radius of its orbit?

Explanation / Answer

how about this:
15. net force = mass * acceleration = 60 * 8 * 9.8=4704N
16.Fac=mv2/r=8000N m=1000kg r=80m

just solve for v=8000r/m=640m/s (do it I don't have a calculator with me now)

17.Fac=mv2/r=250

now solve for r: r=mv2/250=100000000m (big number here) they might need it in km double check that

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