# Math

posted by Casey

Could someone verify the answers. I don't know question C and D

Thank you!

1. In physics, the formula for centripetal force is F =
mv^2/
r
where m is the mass, v the velocity, and r the radius.

a) Find the length of a string when a mass of 2.4kg is being spun at a speed of 5 m/sec if the centripetal force

----------------------------------------
b) What length would the string need to be to increase the force to 20.5 N if the speed is 5 m/sec and the
mass is 2.4 kg?

---------------------------------------
c) If the string is made longer, but the mass and velocity are kept the same, how will this effect the force?

d) What would be the effect on the centripetal force if the mass and velocity were kept the same and the
length of the string was doubled?

1. Steve

a and b are ok

since F varies directly with m and v^2, but inversely with r, increasing r decreases F, as you see if you compare the answers to a and b.

since F varies directly with m and v^2, but inversely with r, doubling r halves F.

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