A record turntable is rotating at 33 and 1/3 rev/min. A watermelon seed is on the turntable 6.0 cm from the axis of rotation. Suppose that the turntable achieves its angular speed of 3.49 rad/s by starting from rest and undergoing a constant angular acceleration for 0.25 seconds. Calculate the minimum coefficient of static friction required for the seed not to slip during the acceleration period.
Thank you!!!
calculate the angular acceleration of the seed:
w_i = 0
w_f = 3.49 rad/sec
convert this to linear acceleration at the seed:
a = alpha*r
a = 13.96*0.060
a = 0.8376 m/sec^2
The maximum centripetal acceleration occurs when the record is moving at max speed so find the max centripetal acceleration:
a_c = (w_f^2)*r
a_c = (3.49^2)*0.060
a_c = 0.731
the 2 accelerations are perpendicular to each other so find the magnitude using Pythagorean:
sqrt(0.731^2 + 0.8376^2) = 1.112 m/sec^2
then calculate the net forces:
u*N = m*A
u*(m*9.8) = m*1.112
u = 1.112/9.8
u = 0.113
The Crosley Traveler Turntable allows you to bring your favorite classic hits to any party! Featuring a compact, suitcase style design, a solid wood, vinyl wrapped case houses a fully functional 3 speed record player. You'll be able to listen to all of your favorite 33 1/3, 45, and 78 RPM records in 7'', 10'', or 12'' sizes. The Traveler features a belt driven mechanism with a diamond stylus needle and a manual return tone arm. A metal resin handle and chrome snap closures ensure safe and easy transport. It is available in tan or tweed. The Crosley Traveler Turntable ensures you're always equipped with your favorite tunes!
By the late 50's, stereo records reached a peak in the marketplace as hi-fi sound reproduction attained its largest audience to date. The portable turntable was introduced in the late 1950's and provided music lovers with a sense of independence, allowing them to easily cart their record player from one locale to another. The popularity of this unit was due in no small part to its portability, but also to its suitcase styled finishing touches that became a Crosley hallmark. The Crosley Traveler Turntable is designed to reflect the portable stylings of yesteryear. This fan favorite is a 3 speed belt driven turntable that plays 33 1/3, 45 and 78 RPM records. The Traveler includes modern conveniences such as a diamond stylus needle and dynamic full range stereo speakers. So whether you choose Ella Fitzgerald or Elvis, celebrate your vinyls in portable style.
12 V DC 15 W 33.33rpm 45rpm 78rpm 90 CR49 Tan Record Turntable AC Adapter Diamond stylus needle Adjustable tone control Chrome Snap Closure Corner Guards The popularity of CR49 is due in no small part to its portability, but also to its suitcase styled finishing touches that became a Crosley hallmark. The Crosley Traveler Turntable is designed to reflect the portable stylings of yesteryear. This fan favorite is a 3 speed belt driven turntable that plays 33 1/3, 45 and 78 RPM records. The Traveler includes modern conveniences such as a diamond stylus needle and dynamic full range stereo speakers. So whether you choose Ella Fitzgerald or Elvis, celebrate your vinyls in portable style. Belt Drive CR49 CR49 Tan Record Turntable CR49-TA Crosley Crosley Radio Corporation Manual Record Turntable www.crosleyradio.com
Stanton Turntable STR8-150 HP In creating the ST.150/STR8.150 Stanton went back to basics and re-engineered everything. These "no nonsense" turntables have everything professional DJs need and nothing they don't. That's why the ST.150 (standard S shaped tone arm) and STR8.150 (skip-proof straight tone arm) are built first and foremost with quality in mind. Both models offer durable construction designed to minimize feedback, industry-leading torque motor - up to 4.5 Kgf-cm, and an ultra-stable platter and tone arm. And with features like Key Correction, Reverse, up to 50% pitch adjustment, and S/PDIF digital outputs - the ST.150 and STR8.150 are strong contenders for the title of Turntable Supreme. Features: Start/Brake Speed Adjustment Digital Output [S/PDIF] Plug straight into CD-R or computer sound card Key Correction Selectable Phono or Line Output (Key correction works on line output only) Dual Start/Stop Buttons Height Adjustable Tone Arm Reverse Play 3 speeds [33,45,78] Quartz Lock Selectable pitch control [+/-8%,+/-25%,+/-50%] Motor Off Feature Removable Target Light Adjustable Feet Includes slipmat and "L" shaped cables Includes Stanton 680HP cartridge mounted on headshell Get Your Stanton Turntable STR8-150 HP Today!
Blast into the vinyl preservation revolution with the CR6007A Tech Turntable. Simply plug in a USB or SD card to transfer music from your records giving you the flexibility to put the digital tunes on CDs or your MP3 player. The tech turntable s playback feature can also be used to listen to prerecorded MP3 files. Return to the days of platform heels and The Beatles Abbey Road album as you admire the woodstyled casing mirror faceplate and streamlined dials. This Crosley turntable even features a PAR (portable audio ready) hookup for MP3 players and an analog AM/FM radio for more listening enjoyment. 3 Speed Turntable. USB/SD Card Reader. USB/SD Encoding. PAR Portable Audio Ready for your iPod or MP3 Device. AM/FM Radio. Stereo Speaker. Remote Control.
Crosley Radio - Turntables - CR7002A - Ride the wave of the vinyl resurgence and preserve your records digitally with the Crosley Troubadour three-speed turntable. Simply pop in your USB or SD card in the front slot and press record, - no wires or computer necessary! Now you have the freedom to transfer your long-lost tunes to CD, MP3, or your computer for more convenient listening. The Troubadour also offers even more - the ability to play music from your USB or SD card, as well as CD's, cassettes and AM/FM radio. Plus, the Troubadour's retro design with real wood panels and a hand-rubbed finish will complement any room in the house. Let your hair hang down and enjoy the music! Specifications: USB/SD Card Reader Belt Driven Turntable Mechanism Plays 3 Speeds - 33 1/3, 45 And 78 RPM Records Plays 7, 10 & 12 Records Portable Audio Ready-Simply Plug In Your Portable Audio Device Or MP3 Player< LI>Diamond Stylus Needle CD Player Programmable 20-Track Memory Repeat Play Random Play Side Mounted Cassette Deck AM/FM Radio Analog Tuner Function Select Dynamic Full Range Stereo Speakers Available in Paprika or Oak finish
In creating the Stanton ST150 DJ Turntable, Stanton went back to basics and re-engineered everything. The ST150's are no-nonsense turntables with everything professional DJs need, and nothing they don't. That's why the ST150 DJ turntables are built first, and foremost with quality in mind. The ST150 offers durable construction designed to minimize feedback, industry-leading torque motor - up to 4.5 Kgf-cm, and an ultra-stable platter and tone arm. And with features like Key Correction, Reverse, up to 50% pitch adjustment, and S/PDIF digital outputs - the Stanton ST150 is a strong contender for the title of Turntable Supreme. Stanton ST150 DJ Turntable Features World's strongest torque motor (4.5 Kgf-cm) Heavy duty steel construction Ultra stable platter and tone arm Includes Stanton 680HP cartridge Start/Brake speed adjustment Digital output [S/PDIF] plug straight into CD-R or computer sound card Key Correction Selectable Phono or Line Output (Key correction works on line output only) Dual Start/Stop buttons Height adjustable tone arm Reverse Play 3 speeds [33,45,78] Quartz Lock Selectable pitch control [+/-8%,+/-25%,+/-50%] Motor Off feature Removable target light Adjustable feet Includes slipmat and L shaped cables Includes Stanton 680HP cartridge mounted on headshell
The portable turntable was introduced in the late 1950?s and provided music lovers with a sense of independence, allowing them to easily cart their record player from one locale to another. The popularity of this unit was due in no small part to its portability, but also to its suitcase styled finishing touches that became a Crosley hallmark. The suitcase is made of vinyl wrapped solid wood for durability and features corner guards and chrome snap closure. The metal resin handle is durable enough to tote the turntable around for many years to come. The Crosley Traveler Turntable is designed to reflect the portable stylings of yesteryear. This fan favorite is a 3 speed belt driven turntable that plays 33 1/3, 45 and 78 RPM records. The Traveler includes modern conveniences such as a diamond stylus needle and dynamic full range stereo speakers. So whether you choose Ella Fitzgerald or Elvis, celebrate your vinyls in portable style. The belt driven turntable mechanism and manual return tone arm are classic reminders of a simpler time. Features: • Belt Driven Turntable Mechanism • Plays 33 1/3, 45 and 78 RPM Records • Plays 7", 10" & 12" Records • Diamond Stylus Needle • Adjustable Tone Control • Dynamic Full Range Stereo Speakers • Solid Wood Construction • Vinyl-Wrapped • Chrome Snap Closure • Corner Guards • Metal Resin Handle • Manual Return Tone Arm • Color: TanSize: 7"tall x 17"wide x 11"deep
It has been said that the best things come in small packages. Crosley has put this into practice. They have used the same great technology and design that turntables and entertainment centers encompass and scaled the size to petite. Outstanding technology proves its authenticity as a Crosley product. It has been said that the best things come in small packages. At Crosley we have put this into practice with our Mini Turntable. We have used the same great technology and design that our turntables and entertainment centers encompass and scaled the size to petite. The Mini Turntable features classic styling with suitcase vinyl housing and technology that proves its authenticity as a Crosley. The Mini comes complete with a 3 speed belt driven turntable that plays 33 1/3 45 and 78 RPM records and dynamic full range stereo speakers. With amenities like that you don t have to sacrifice any of your vinyl listening pleasure. Experience the soft crackle as you gently lay the needle down on your favorite vinyl that s been buried in the attic for decades. It may be mini but it packs a big punch. Size: 14.25 W x 4.75 H x 8 D.
It has been said that the best things come in small packages. Crosley has put this into practice. They have used the same great technology and design that turntables and entertainment centers encompass and scaled the size to petite. Outstanding technology proves its authenticity as a Crosley product. It has been said that the best things come in small packages. At Crosley we have put this into practice with our Mini Turntable. We have used the same great technology and design that our turntables and entertainment centers encompass and scaled the size to petite. The Mini Turntable features classic styling with suitcase vinyl housing and technology that proves its authenticity as a Crosley. The Mini comes complete with a 3 speed belt driven turntable that plays 33 1/3 45 and 78 RPM records and dynamic full range stereo speakers. With amenities like that you don t have to sacrifice any of your vinyl listening pleasure. Experience the soft crackle as you gently lay the needle down on your favorite vinyl that s been buried in the attic for decades. It may be mini but it packs a big punch. Size: 14.25 W x 4.75 H x 8 D.
This multifunction turntable plays 33 45 and 78 RPM records and lets you turn your old music into digital music files using your PC. A USB port allows you to connect this turntable/cassette player to your computer and digitize your music using the free Audacity software. This unit is equipped with two stereo speakers for highquality audio playback. Stereo RCA output allows you to connect this turntable to your home audio system for even bigger sound. Itrsquo;s all packed into an elegant briefcasestyle design thatrsquo;s sure to turn heads. 3 Speed Turntable: 33 45 78 RPM. Ceramic Stereo Cartridge. 45 RPM Adapter. Two Builtin Stereo AntiMagnetic Speakers. USB Port For Connection to PC Convert Vinyl to MP3. Stereo RCA Output. AC Power Supply. Free Audacity Software Included For VinyltoMP3. Dimensions: 10.63 x 13.78 x 4.33
2 x 1.5W RMS Output. 3 Speed Selectable Turntable. AM/FM/FM Stereo Radio with Analog Tuning. 2 Builtin Speaker. Line Out Jack. Rotary Volume Control. Power LED Indicator. FM Stereo LED Indicator. Antique Wooden Case Design. Power: AC 120V 60Hz
Crosley Radio - Turntables - CR49BK - By the late 50s, stereo records reached a peak in the marketplace as hi-fi sound reproduction attained its largest audience to date. The portable turntable was introduced in the late 1950s and provided music lovers with a sense of independence, allowing them to easily cart their record player from one locale to another. The popularity of this unit was due in no small part to its portability, but also to its suitcase styled finishing touches that became a Crosley hallmark. The Crosley Traveler Turntable is designed to reflect the portable stylings of yesteryear. This fan favorite is a 3 speed belt driven turntable that plays 33 1/3, 45 and 78 RPM records. The Traveler includes modern conveniences such as a diamond stylus needle and dynamic full range stereo speakers. So whether you choose Ella Fitzgerald or Elvis, celebrate your vinyls in portable style. Belt Driven Turntable Mechanism Plays 33 1/3, 45 and 78 RPM Records Plays 7, 10 & 12 Records Diamond Stylus Needle Adjustable Tone Control Dynamic Full Range Stereo Speakers Solid Wood Construction Vinyl-Wrapped Chrome Snap Closure Corner Guards Metal Resin Handle Color: Tan, Tweed, Black Manual Return Tone Arm Size: 17�w X 7�h X 11�d Estimated Shipping Weight: 16 lbs
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3 Speed Turntable
February 1st, 2010
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