Parts Lens Unit
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CHEMISTRY HELP PLEASE !!!?
hey just want to know if i got this problem right .
problem:
The area of a telescope lens is 5000. mm2.
(a) What is its area in square feet (ft2)? (For part a use 4 significant figures for answer)
(b) If it takes a technician 60. s to polish 275. mm2, how long does it take to polish the lens?
I just want to know if i got it right for a) i got 16.40ft^2
Someone told me that i don't have to account for the ^2 so do i have to or is that just units that doesn't have to be computed for in the problem ???
And please tell me how to find part b would it be 1090.90 seconds?????
Please tell me if i got it correct i want to see how you do the problem since it could be done in a couple ways .
Thanks All
google has it that, one (square foot) = 92 903.04 square millimeter
5000. mm2. @ 1 ft^2 / 92,903 mm^2 = 0.05382 ft^2
we can get our own conversion factor by squaring mm to ft:
if 1 foot = 304.8 mm
then squaring both sides gives
1ft^2 = 92903.04 mm^2
your answer is 0.05382 ft^2
=======================================================
5000 mm^2 @ 60 seconds / 275 mm2 = 1090.91 seconds
yes, you are right
but it ereally should be rounded off for sig figs
60. seconds has only 2 sig figs
perhaps your answer should be 1100 seconds
aka 18 minutes
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