An ant sits on a cd at a distance of 17cm from the center. If it sits there for 42 seconds, it travels a total distance of 913 cm.
What angle has the ant turned through? ( in radians )
What rpm is the cd turning at?

Question

An ant sits on a cd at a distance of 17cm from the center. If it sits there for 42 seconds, it travels a total distance of 913 cm.
What angle has the ant turned through? ( in radians )
What rpm is the cd turning at?

jack1 · Answer

circumference of circle with radius 17cm = ...?

jack1 · Answer

@Zaira11 ...? do you know how to calculate the circumference of a circle...?

jack1 · Answer

|dw:1407415337354:dw|

anonymous · Answer

Yes 2piR

jack1 · Answer

sweet, so if r = 17, C = 2 pi R = ...?

anonymous · Answer

106.81

jack1 · Answer

sweet, so if 106.8cm = the circumference = 1 full rotation... how many rotations has the ant made in 913cm?
=913/106.8 = ...?

jack1 · Answer

sorry, g2g, @hartnn could you please help zaira?

anonymous · Answer

8.54 I guess

jack1 · Answer

yep, 8.54 rotations in 42 sec
sorry bai

anonymous · Answer

Its okay thankyou,