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 Form 1 Physics Measurement 1 Video Questions and Answers

A length 550 cm of thin thread wraps around a cylinder exactly 25 times. Calculate the circumference and the radius of the cylinder. (Take #pi=22/7#)

 (2m 17s)
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Answer Text:
Circumference = (length of thread)/(number of wraps)
=#550/25#=22cm or 0.22m
Circumference = #2pir#
0.22=2×#22/7#× r
7/44×0.22=#cancel44/cancel7× r×cancel7/cancel44#
r=0.035m


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