## anonymous 4 years ago A 85.3 kg ice skater is moving at 4.38 m/s when she grabs the loose end of a rope, the op- posite end of which is tied to a pole. She then moves in a circle of radius 0.564 m around the pole. Find the force exerted by the rope on her arms. The acceleration of gravity is 9.8 m/s2 . Answer in units of kN

1. anonymous

|dw:1349481863357:dw| Can you figure what the answer now?

2. anonymous

maybe if i see the formula

3. anonymous

Force on skater's arm is centripetal force that makes her move in circle with speed 4.38 m/s.

4. anonymous

$F=\frac{mv^2}{r}$

5. anonymous

i tried that the solution i got was 2901.470426 but the computer said it was incorrect

6. anonymous

Do you put your ans in kN? (2.9 kN)

7. anonymous

i didnt thank u

8. anonymous

try g=v^2/r the mass shouuld cancel

9. anonymous

i got it thanks