Tennis String Tension Meter
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Tennis String Tension Meter
Physics HW help- (Elasticity) keep getting wrong answer-?
This is the question I need answered:
A nylon tennis string on a racket is under a tension of 240 N. If its diameter is 0.93 mm, by how much is it lengthened from its untensioned length of 30.4 cm
Here is my attempt to solve (but I get the same WRONG answer everytime)------------------------------…
Everything was converted to meters if needed:
F= 240 N
radius= .000465 m
original length= .304 m
modulus (E)= 5 x 10^9
Area= pi(r^2)= .000000679 m
I have used these equations:
delta L = [(1/E) x (F/A) x Lo]
Lo being Length knot OR initial length
F= E (delta L / Lo) A
No matter what I do, the answer comes out to be .02149 m
The answer needs to be in centimeters, so I end up with .0002149 cm
But it is wrong...
Are my calculations off? Not doing it right? Help please!!!
PLEASE help only if you know the answer and HOW to do it, please and thanks 
Actually, 0.02149 m is 2.140 cm
lol
You're work looks right to me. I got the same result.
E = (F/A) / (delta L / Lo)
delta L = FLo / AE = 0.02149 m
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Tm-5 - 70340 5Ton Tension Meter $1473.01 [277-TM-5] UPC: 662005703400 9.3 LB |
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In Tension $6.49 In Tension |
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Head MicroGel Extreme Tennis Racquet $176.68 Brand: HeadMicroGel Extreme Tennis RacquetHead size: 100 square inches Length: 27.25 inches Weight (strung): 11.1 ounces Stiffness (Babolat RDC): 67Balance: 13.1 inches head light Cross section: 24/26/23mm tapered beam Swing weight: 328 kg*sq. cm String pattern: 16x19Grip: Head HydroSorbRacquet will be strung before it is shipped with a complimentary 16-gauge string at mid tensionIncludes a head cover |
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Deluxe Table Tennis Net Set from Martin Kilpatrick $34.38 66" black cotton net. Durable rubber padding on bracket and clamps to protect table surface. Adjustable screw to accurately calibrate net height. Fits tables up to 2 1/4" thick. Adjustable string and metal chain net tension system.You may also be interested in Table Tennis Balls. |
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Lec 7 | 8.01 Physics I: Classical Mechanics, Fall 1999
