Rpm Turntable HELP PLEASE! What is the coefficient of static friction between the coin and the turntable?
A coin is placed 11.5 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turntable until a rate of 37 rpm is reached, at which point the coin slides off. What is the coefficient of static friction between the coin and the turntable
Static friction provides the centripetal force needed to hold the coin in place.
For Friction use F = mu*N where N = m*g so F = mu*m*g
This must equal m*v^2/r (mass time centripetal acceleration)
Therefore mu*m*g = m*v^2/r so mu*g = v^2/r but v = r*omega so
mu*g = r*omega^2 so mu = r/g*omega^2 = 0.115m/9.80m/s^2*(37x2pi/60)^2 = 0.176
The sleek and functional Revolution Turntable puts a new spin on the way you play your records. Unlike conventional record players, this turntable is space-efficient, portable and cord free. This 2-speed record player also functions as a digital converter, making it easy to transfer any 33 1/3 or 45 RPM record to PC or Mac via a convenient USB connection. Ripping and editing software is included. The turntable is battery powered and pairs up with any FM radio wirelessly. You can also plug in any portable audio device, such as an MP3 player, and enjoy clear, quality sound provided by dynamic full range stereo speakers. Made of plastic and metal. This item ships directly from the manufacturer. Product usually arrives in 2-8 business days, depending on destination, including order processing and shipping. APO/FPO shipping unavailable
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Experience the nostalgic sound of vinyl with this fully automatic belt-driven turntable that supports 33-1/3 and 45 rpm record playback speeds and features a USB output for importing your favorite records' tracks to a PC.
The rugged Stanton T52 DJ turntable is a reliable belt drive turntable that is ideal for the novice to mid-level DJ. Simple to use but packed with great pro features, the T52 DJ turntable has a straight tone arm (for DJs who want to scratch) and also includes the versatile and popular Stanton 500.v3 cartridge, a professional quality slipmat for better control and a convenient cloth dust cover to protect the deck when it's not in action. Stanton T52 DJ Turntable Features Easy to Operate Belt Drive Turntable with Professional Features Sturdy Design with Comfortable and Practical Layout Straight Tone Arm Improves Tracking for Scratching Includes Quality Stanton 500.v3 Cartridge Pre-mounted on Headshell 2 Playback Speeds (33 or 45 RPM) 2 Start/Stop Switches for Mix or Battle Setup RCA Stereo Outputs Manual Pitch Control Fader (+/- 10% Adjustment) Accessories include RCA Cables, Slip Mat, and Dust Cover
10% 33rpm 45rpm 78rpm PT-01USB Record Turntable Cartridge AC Adapter 45 RPM Adapter USB Cable Plug and play USB connection Protective dustcover and integrated carrying handle Fits inside a standard 12-inch record case Numark has created a revolutionary portable turntable that enables you to convert your vinyl to WAV or MP3. This rugged, portable turntable can run on either wall or battery power, comes with a cover with integrated carry-handle, and has an internal speaker for total mobility. Using the recording software, no special drivers are needed to connect PT-01USB to any Mac or PC via USB and transfer music from vinyl to hard disk. Belt Drive Headphone MP3 Numark Numark Industries, LLC PT-01USB PT-01USB Record Turntable PT01USB RCA - Audio Line Out Record Turntable USB www.numark.com
Enjoy the classic sound of vinyl records with the Crosley Tech Series Turntable. Capable of playing any 33 1/3, 45, or 78 RPM record in a 7'', 10'', or 12'' size, you'll love re-visiting that vinyl collection you once enjoyed so much! Mixing the classic with the modern, this high-tech record player is also portable audio ready for any MP3 or portable audio device. You can even tune into your favorite AM/FM radio. Featuring a beautiful wood style cabinet, this turntable is sure to be a classy addition to any home decor! Relax and enjoy the sweet sounds of vinyl with the Crosley Tech Series Turntable!
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Stanton Turntable T 52B The Stanton T.52B is a rugged and reliable belt-drive turntable perfect for everyday use and ideal for novice to mid-level DJs. Stanton builds the T.52B turntable so that it is simple to use but packed with great pro features. You get a manual pitch control fader and 2 Start/Stop switches for mix or battle setup. The Stanton T.52B turntable also has a straight tone arm—for DJs who want to scratch—and includes the versatile Stanton 500.v3 cartridge pre-mounted into the headshell. The T52.B turntable also has a professional quality slipmat for better control, and a convenient cloth dust cover to protect your deck when it's not in action. Features: Easy-to-operate belt-drive turntable with professional features Sturdy design with comfortable and practical layout Straight tone arm improves tracking for scratching Includes quality Stanton 500.v3 cartridge pre-mounted on headshell 2 playback speeds (33 or 45 RPM) 2 Start/Stop switches for mix or battle setup RCA stereo outputs Manual pitch control fader (+/- 10% Adjustment) Accessories include RCA cables, slipmat, and cloth dust cover Get Your Stanton Turntable T 52B Today!
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The Stanton T.52X is a rugged and reliable belt-drive turntable perfect for everyday use and ideal for novice to mid-level DJs. Stanton makes the T.52X turntable simple to use but has packed it with great pro features. The T.52 turntable has a straight tone arm (for DJs who want to scratch) and also includes a professional quality slipmat for better control. A convenient cloth dust cover protects your Stanton T.52X when it's not in action.Easy-to-operate belt-drive turntable with professional features Sturdy design with comfortable and practical layout Straight tone arm improves tracking for scratching 2 playback speeds (33 or 45 RPM) 2 Start/Stop switches for mix or battle setup RCA stereo outputs Manual pitch control fader (+/- 10% Adjustment) Accessories include RCA cables, slipmat, and cloth dust cover
The Stanton T.52X is a rugged and reliable belt-drive turntable perfect for everyday use and ideal for novice to mid-level DJs. Stanton makes the T.52X turntable simple to use but has packed it with great pro features. The T.52 turntable has a straight tone arm (for DJs who want to scratch) and also includes a professional quality slipmat for better control. A convenient cloth dust cover protects your Stanton T.52X when it's not in action.Easy-to-operate belt-drive turntable with professional features Sturdy design with comfortable and practical layout Straight tone arm improves tracking for scratching 2 playback speeds (33 or 45 RPM) 2 Start/Stop switches for mix or battle setup RCA stereo outputs Manual pitch control fader (+/- 10% Adjustment) Accessories include RCA cables, slipmat, and cloth dust cover
The Gemini TT-2000 Direct Drive Turntable boasts an aluminum platter and a precision aluminum tone arm. This ruggedly constructed turntable offers road-ready durability with superior tracking and skip-resistance under the most strenuous playing conditions. The Gemini TT-2000 turntable's robust ABS base and enclosure with heavy adjustable rubber feet completely eliminate feedback from external vibration. The TT-2000 turntable is also equipped with an easy soft-touch MOTOR ON/OFF button with LED indicator for quick response on starting the platter and simple 1-touch variable 33 and 45 RPM speed buttons.Gemini delivers the TT-2000 Direct Drive Turntable with detachable RCA and ground cables.
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Magical Wings(2nd Turntable Version) by The Flock on USA 45 rpm record.
Can Vinyl Last Forever? Tips on the Care of Vinyl Records
Ahhh, the sweet sound of a vinyl record playing your favorite music. Some say that there is no better way to listen to their music. Yes, vinyl records have made a triumphant return to the music arena, with sales over the last few years on a steady increase.
However, opponents of the format may point to the delicate nature of vinyl, records do require due diligence and upkeep in order to keep them sounding their best. But if you maintain a vigilant ritual, vinyl records can last many decades, so the records that you own right now can conceivably be passed down through generations of music lovers. And the bonus for properly maintaining your records is enjoying a crisp, clear playback each time you spin your turntable.
Let's explore some relatively easy ways to properly care and maintain vinyl records so they can be listened to and enjoyed and also to help preserve their resale value for years to come:
Never touch the grooves
When handling records, treat them with loving care, hold them with two hands around the outer edges of the record; never allowing your fingers to touch the grooves. A simple method to alleviate this potential problem area would be to invest in some disposable plastic gloves, like the ones used in food preparation. Then, one can easily manipulate the record playing process and take the fear out of handling records.
Know the enemies of vinyl
The environment in which your records are stored is very important to a long shelf life. If you want a long shelf life for your prized recordings, keep the records away from dirt, dust, smoke, fingerprints, and oils from human skin as well as faulty phonograph needles. Never stack your records on top of each other, albums should be stored vertically. Avoid storing them too tight as it can lead to ring wear on the cover or sleeve and cause unnecessary stress to the record's materials, surface and label, often resulting in warps and contact damage. Additionally, the records should be stored in a low humidity setting with a temperature between 60 and 70 degrees if possible. Obviously, it is imperative to keep your treasured vinyl away form heat sources such as sunlight, heater vents and even lighting. Avoid dusty environments and if possible store the records in a relatively airtight container such as a cabinet with doors or sealable boxes or bins.
Protecting your records and LP jackets
There are different opinions on this, but it is recommended by most to remove the original wrapping from the manufacturer, the dreaded shrink wrap, as this may shrink over time; eventually warping the jacket or possibly the record. A note of caution, however, some of the stickers or promotional information on this shrink wrap may actually make the album more valuable if left on; so use discretion when removing the shrink wrap. It is recommended to replace this wrapping with a high density polyethylene outer protective sleeve.
There are several vendors where one can buy these protective outer sleeves, but one that offers many different options for record collectors is a well-respected vendor www.bagsunlimited.com. Bags Unlimited has been in the collection protection business since 1975 and are the #1 choice of collectors for storage, display and shipping products for their collectibles. BagsUnlimited.com stocks record bags made out of polyethylene, polypropylene and polyester (Mylar). All three of these materials have passed the Photo Activity Test (P.A.T.) certifying that they are safe for long-term storage and protect them from dust, dirt, finger oils, and other airborne pollutants.
"We carry multiple types of poly sleeves, varying in thickness and record jacket sleeves that come with a re-sealable flap, depending on the collector's choice," explained David Street of BagsUmlimited.com. "We also stock 2 mil and 4 mil sleeves that are manufactured of archival polyester (Mylar), an inert material of the highest clarity. Mylar is extremely clear, inert, 100% acid-free and considered to be the most archival of all protective sleeves. Polyester will not discolor, damage or adhere to items placed inside it. This material has passed the Photo Activity Test and Polyester is used worldwide in museums, libraries and archives. Our polyester material has been approved by the Library of Congress for archival storage."
It is also very important to have clean, acid free inner sleeves to protect your records with paper sleeves being the most practical. Some recordings were issued with inner sleeves that have acidity issues, which over time, could damage the vinyl records that they hold. Additionally, some sleeves may be viewed as collectible, so it's best to save them as part of the album package.
"We are the manufacturers of our paper sleeves and therefore have control over the sizes and materials used. Being the manufacturers also insures that the sizes are true, the holes are centered, and the seams are well-glued," stressed Street. "Investing in quality sleeves for your records is one of the most important care tips for long lasting vinyl."
Storing your records in boxes can also add to the preservation process in many ways according to Street:
"Bags Unlimited boxes are the Standard of the Industry. Storing your records in our boxes keeps them in an environment that will protect the corners, edges, and flat surfaces. It also keeps them away from ultraviolet light, dust and other airborne pollutants that can destroy or damage them," Street stated. "Our boxes are super strong, properly sized and stackable. They come with 3" deep sturdy covers and die-cut handles that can be in the open position for carrying or closed position for storing.
Cleaning and maintaining vinyl records
The most important aspect of owning and playing vinyl records is to keep the records clean. Due to the chemical nature of vinyl, they attract dust and dirt. This is caused by vinyl's tendency to build up static electrical charges which attract small particles of dust which land in the grooves. These particles will cause "pops" and "clicks" as the record plays.
The cleaning of records should be performed before and after playing. This will ensure the best possible playback, and also prepares the record for "dust free" storage. It's highly recommended that a record collector have on hand some sort of carbon fiber brush (there are many varieties of brushes available). Carbon fibers are used to help disrupt static buildup while brushing relies on the vibration of the almost microscopic carbon fibers to clean the grooves and remove dust and dirt. It's recommended that the turntable be running while brushing rather than holding the record in your hands because this will result in a smoother, more consistent cleaning motion.
Some people get so intensely careful about cleaning their vinyl records, they often forget about keeping the needle clean. Since the needle is constantly tracking in the groove of the records, it attracts large amounts of dirt and dust particles and must be cleaned. When not properly maintained, the needle may not vibrate fully and may not rest in the bottom of the record groove; resulting in decreased sound quality and other audio problems. Needle maintenance supplies are easily obtained, for instance, the aforementioned BagsUnlimited.com sells an inexpensive "Stylus Care System" which includes a special cleaning fluid and a dense nylon brush to maintain a clean needle.
Obviously the turntable surface should be kept clean of dust and static. Most newer turntables come equipped with a rubber or antistatic felt surface. A great way to clean both the needle and the turntable area and also keep the carbon fiber brush clean is with condensed air in a can, which is available at any electronics retailer; just spray the area before and after playing your records for a continued dust free environment for your audio treasures. Taking this one step further, BagsUnlimited has in stock a unique antistatic solution, as Dave Street explains:
"We carry a portable antistatic, ionizing air gun to use with the condensed air dust remover and it will significantly boost the ability of canned air to remove dust from static-prone areas. This ionizing gun effectively neutralizes static charges in vinyl, plastics, glass, films, Mylar and other items that hold static charges by creating a flow of ions that neutralizes static charges and releases clinging dust. The gun easily snaps onto any type of nonflammable canned air," explained Street.
There are many cleaning solutions that can be used to 'wet' wash a record and it really is a matter of personal preference as to which one to employ. In the old days, when record were made of shellac, they could be cleaned with a mild solution of regular soap and water (always use distilled water as tap water often contains too many contaminants) and this was the preferred way to maintain the old 78 rpm records. Never use the new cleaning solutions on 78's because they are alcohol-based and can dissolve shellac recordings and will ruin these types of records.
Speaking with Dave Street again, they sell several kits of various sizes to help keep record clean.
"We recommend the 'Groovy Record Cleaning Kit' and each kit comes with micro bristled cleaning brush; cotton cleaning cloth, various sized bottles of GROOVY Cleaning Fluid which is Bags Unlimited's own Record Cleaning Fluid, and is specially formulated for its deep cleaning, antistatic, residue-free properties."
It's also recommend not storing the vinyl inside the record cover but instead slip the vinyl (protected by the inner sleeve) behind the cover with both protected by the outer sleeve, because storing the vinyl inside the cover may eventually create seam and/or spine splits. Over time the weight of the record could possibly cut through the binding.
The reward
This article was not written to exemplify how hard it is to maintain vinyl records; on the contrary, these are very simple tasks and often become mundane and second nature after time. But the reward is so great-the preservation of your prized collection and the coupdeville- the best possible sound reproduction that is humanly possible. With proper care and diligence, these historic audio treasures will last a lifetime or two, giving vinyl record owners many hours of listening bliss.
About the Author
Author Robert Benson writes about rock/pop music, vinyl record collecting and operates http://www.collectingvinylrecords.com
, where you can pick up a copy of his FREE ebook called "The Fascinating Hobby Of Vinyl Record Collecting." Have your vinyl records appraised at http://www.vinylrecordappraisals.com
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Rpm Turntable
August 28th, 2009
Posted in Turntables for Sale | 
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