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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