A student uses a ruler to determine the circumference of a wooden dowel. She puts a mark onto the dowel, then rolls it along the ruler three times, before reading the position on the
ruler at which it stopped.
What is the circumference of the dowel?
- attachment
Starting
Final
position
position
Mark on can
can rolled
0
5 10
15
20
25
30
35
40
o
A
12 cm
OB 12.3.com
Oc. 37 cm
O
D

3. a worker pushes a 30.5 kg polished stone along a polished table with a force on bonin a straight line for 5.20 s after starting from rest. there is no friction between thestone and the table. at the end of the table. the stone is hooked to a cable with a lengthof 62.0 cm to rotate it to a rough table to store until they can be picked up. the roughtable has a coefficient of static friction 0.702 with the polished stone. remember that 8= 9.80 m/s2a) what is the speed of the stone when it is hooked to the cable? b) what is the tension in the cable while the stone is rotating? (there is still nofriction)c) how much force is needed to make the stone begin sliding from rest on therough table? ius = 0.70262.0 cm30.5 kg20.5 kg6= 0

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