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9. -<br />

R =20m<br />

<br />

T =5min<br />

-<br />

g =10m/s 2 ,<br />

<br />

-<br />

-<br />

<br />

<br />

500 N;<br />

<br />

<br />

<br />

10. -<br />

-<br />

<br />

<br />

<br />

11. m -<br />

αa → u <br />

-<br />

<br />

<br />

• <br />

• <br />

a → u <br />

-<br />

<br />

mg cosα<br />

<br />

<br />

<br />

-<br />

<br />

<br />

142

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