Takeup Reel
physics question, about angular acceleration help!?
professional recordingudios often use reel-toreel tape decks. On such a tape deck, the tape is pulled past the playback at a constant linear speed of 0.381 m/s. The angular speed of the take-up reel is 7.5 rad/s. After 2.4 x 10^3 seconds, the takeup reel is almost full, and the average acceleration is .0017 rad/s^2.
Does this acceleration indicate an increasing or decreasing angular velocity? Why?
Let:
v be the constant linear speed of the tape,
w be the angular velocity of the take-up spool,
r be the radius of the tape on the take-up spool.
Then:
w = v / r.
As tape is being wound on to the take-up spool, the radius r of the tape it contains is increasing.
As v is constant, v / r is decreasing, and therefore w is decreasing.
Teac X-2000R with black Maxell takeup reel
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Teac Black Metal 10.5 Takeup Reel $78.77 |
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TDK 267 Metal 10.5 Takeup Reel With Tape Nice $15.00 |
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P/A Industries Stock Reel with Paper Takeup $1,500.00 |
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NEW UNUSED 7.5″ 1/4″ TAKEUP TAKE UP REEL !! $6.95 |
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NEW UNUSED 7.5″ 1/4″ TAKEUP TAKE UP REEL !! $6.95 |
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Scotch RB-7 Empty Takeup Reel for 1/4″ Tape, with box $0.49 |
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Sony X39453983 REEL TAKEUP TABLE $20.95 |
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8MM VCR CAMCORDER SUPPLY AND TAKEUP REEL TORQUE GAGE $58.00 |
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BETA SUPPLY AND TAKEUP REEL TORQUE GAGE $69.00 |
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BETA VCR TAKEUP REEL TORQUE GAGE $35.00 |
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AKAI Metal 10.5″ Takeup Reel $30.00 |
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NOS takeup reel table for vintage Sony RTR X-34090-49-1 $49.99 |
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Sharp NDAIV1046GEZZ TAKEUP REEL SPINDLE $10.95 |
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1″METAL TAKEUP REEL 10.5″otari revox ampex tape NAB HUB $25.00 |
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Mimaki JV3 160S SP 63 Solvent Printer Takeup reel $5,999.00 |
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HP – Take-up reel … |
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HP – Take-up reel … |
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Epson – Take-up reel … |
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HP – Take-up reel – 42 … |
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HP – Take-up reel … |
Tags: 8mm take up reel, microfilm take up reel, roland take up reel, take up reel, wire take up reel
By admin | 20. Jul 2010 | Vintage Stuff | No Comments »