Parts Lens Unit
| Powered by phpBay Pro |

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
Items Recently Purchased From This Site:
| Powered by phpBay Pro |
Best Posts
- Series Service Repair
- Battery Sony Ccd
- Replacement Lcd Screen
- Vision Waterproof Wireless
- Cover Parts Repair
- Zeiss Jena Tessar
- Telephoto Tele Lens
- Dual Charger Canon
- Top Cover Plate
- Jvc Minidv Digital
- Dock Insert Adapter
- Nikon Lens Cap
- Red Yellow Green
- Camera Parts Oem
- Camera Hood Petal
Categories
- Camcorder Accessories (973)
- Camera Parts (309)
- Film Cameras (375)
- Flashes (540)
- Lenses And Filters (2031)
- Updates (1)
Tags
Recently Added
- Strap Nikon Coolpix
- Battery Jvc Minidv
- Sony Nikon Fuji
- Fisheye Canon Rebel
- Lens Kit Olympus
- Digital Flash Panasonic
- Adapter Holder Cokin
- Battery Sony Pal
- Philips Mini Dvd
- Light Macro Photography
Calender
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| « Apr | ||||||
| 1 | 2 | 3 | 4 | 5 | 6 | |
| 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 | 25 | 26 | 27 |
| 28 | 29 | 30 | 31 | |||
Archives
- April 2011 (5)
- March 2011 (154)
- February 2011 (170)
- January 2011 (164)
- December 2010 (181)
- November 2010 (168)
- October 2010 (213)
- September 2010 (167)
- August 2010 (155)
- July 2010 (171)
- June 2010 (167)
- May 2010 (173)
- April 2010 (174)
- March 2010 (168)
- February 2010 (82)
- January 2010 (75)
- December 2009 (81)
- November 2009 (84)
- October 2009 (88)
- September 2009 (86)
- August 2009 (80)
- July 2009 (83)
- June 2009 (80)
- May 2009 (77)
- April 2009 (90)
- March 2009 (90)
- February 2009 (37)
- January 2009 (30)
- December 2008 (47)
- November 2008 (53)
- October 2008 (44)
- September 2008 (36)
- August 2008 (33)
- July 2008 (47)
- June 2008 (51)
- May 2008 (30)
- April 2008 (30)
- March 2008 (30)
- February 2008 (43)
- January 2008 (45)
- December 2007 (42)
- November 2007 (30)
- October 2007 (39)
- September 2007 (32)
- August 2007 (42)
- July 2007 (44)
- June 2007 (41)
- May 2007 (44)
- April 2007 (34)
- March 2007 (47)
- February 2007 (40)
- January 2007 (12)






























































