Turntable Speed Disc
October 1st, 2007
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Turntable Speed Disc
Rod on Rotating Disk (Angular Momentum)?
A uniform disk (like a record turntable) turns with a frequency of 4.5 rev/s around a frictionless spindle. A non-rotating rod of the same mass as the disk and length equal to the disk's diameter is placed on the freely spinning disk so both turn around the spindle. (Idisk = M R^2/2, Irod = M L^2/12)
b) More realistically, there is a frictional force between the two surfaces such that the magnitude of the torque slowing down the disk is equal to the magnitude of the torque speeding up the rod. Hence we have adisk = -C arod, where a generically means angular acceleration. Find the constant C.
C = ??
d) Suppose Idisk = .65 kg m^2. What is the magnitude of the kinetic energy lost due to friction?
W = ?? J
b).
T_disk = -T_rod
I_disk (α_disk) = -I_rod (α_rod)
(α_disk) = -(I_rod/I_disk) (α_rod) = - C (α_rod)
where
C = (I_rod/I_disk) = (1/12) (M (2R)²)/(½ M R²)
C = ⅔
d).
I_disk = 0.65 kg m²
I_rod = C (I_disk) = ⅔ (0.65)
I_rod = 0.43 kg m²
using conserve of angular momentum,
initial momentum = final momentum
both of rod and disk have same rotational axis, so I_both = I_rod + I_disk
I_disk (ω_disk) = I_both (ω)
0.65 (2π * 4.5) = (0.43 + 0.65) (ω)
ω = 17.02 rad/s
initial kinetic energy,
Eo = ½ I_disk (ω_disk)² = ½ (0.65) (2π * 4.5)² = 259.82 J
final kinetic energy,
E = ½ I_both (ω)² = ½ (0.65 + 0.43) (17.02)² = 156.43 J
losing energy due to friction
Eo - E = 259.82 - 156.43 = 103.39 J
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3 SPEED TURNTABLE $89.99 3 SPEED TURNTABLE |
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CR49-BK Traveler Turntable (Black) $119 The optimum use of a disc record of constant rotational speed occurs when the innermost recorded diameter is half of the outermost recorded diameter.” But why worry yourself with the details. The Crosley Portable Suitcase Style Turntable plays all three speeds, 33 1/3, 45 and 75 RPM records. By the late fifties, 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. So whether you choose Ella Fitzgerald or Elvis, celebrate your vinyl in portable style. |
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Keepsake USB Turntable in Tan by Crosley Radio $154.99 Can?t bear to live without your vinyl albums, yet can?t seem to find the time to fire up the record player these days? Well, have we got a solution for you ? The Crosley Radio Keepsake Turnable. You can now simply take your old vinyls and convert them to CD in minutes with just a few simple steps. The Keepsake allows those old albums to be recorded in a digital audio format for high quality sound on a smaller, more modern compact disc. It easily interfaces with the USB port on any computer by utilizing the supplied software suite. However, if you still want to enjoy your albums old style, then Crosley?s Keepsake offers a 3 speed turntable for your listening enjoyment. Preserve your entire music collection with the Keepsake. Every facet of this incredibly innovative approach is completely user-friendly for those of all ages. This attractive player is equipped to maintain the classic sounds while capable of removing cracks and pops to satisfy even the most meticulous songster. 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 Keepsake 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 Keepsake 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: Tan Size: 7"tall x 17"wide x 11"deep |
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Denon DN-S3700 DIGITAL TURNTABLE 2 Pack $1798 This DJ packages comes with two Denon DN-S3700 Direct Drive Turntable Media Players and Controllers, portable, single-deck units that provide working DJs with a host of useful features for enhanced creative flexibility. Most notably, thanks to their large 9" spinning platter design, the DN-S3700 turntables literally offer the "best of both worlds" from both digital and analog realms. In addition to a host of advanced digital features, including USB and MIDI control, these sleek and elegant media players includes a built-in authentic vinyl record for surface control driven by Denon DJ's High Torque Direct Drive motor. This provides users with the classic and unmistakable feel of true vinyl.High Torque Direct Drive Motor & Spinning Platter DesignDenon's proprietary 12-pole Direct Drive brushless motor design is keeping the art of the 110-year-old turntable alive & true to its native feel, delivering instant, full-rotation speed with a powerful 2.5 kg/cm of start-up torque within 0.5 seconds for true turntable reaction and response. DJs can perform freely on this 9" platter design mounted with a real vinyl record as if they were using a genuine analog turntable. Platter rotation can be changed between 33 and 45 RPM for comfort. Fast Loading Slot-In DriveThe illuminated, fast-loading, quick-reading slot-in drive reads and supports standard compact audio discs and MP3 discs in a variety of formats: CD, CD-R, CD-RW, CD-ROM. Compact Disc CD-TEXT and MP3 ID3 Tags on CD-ROM are also displayed. USB Device HostingWith easy access to the internet these days, many DJs are shopping from home, purchasing their music collection online and storing these files on to a hard drive. The DN-S3700 is one piece of DJ equipment that is well equipped for the modern DJ and conveniently supports external USB mass storage class devices (USB Hubs are not supported). Connect your iPod (mass storage class iPods only), thumb drive, and large hard drives for easy access to your small or extensive MP3/WAV libraries up to 50,000 files. Simply plug any one of these devices into the Denon DN-S3700 to obtain the powerful on-board features such as Instant Start, Auto Looping, Hot Starts, Effects, 8 ways to file search, and so much more.MIDI Interface Controller (PC/MAC)The DN-S3700 turntable is also designed to interface & control a variety of popular audio/video DJ software applications that support USB MIDI interface, either by user-custom mapping or direct native support by the software vendor. Control your favorite DJ software all from one clever compact player. Supported platforms include Mac OSX 10.4 or higher, Windows XP SP2, Windows Vista. Internal 24-Bit Processing & USB Audio-(sound card)Unlike most dedicated DJ MIDI controllers that are only USB bus-powered, the Denon DN-S3700 encompasses its own internal power supply to achieve the highest electrical specifications, resulting in best possible audio performance. It features high-end Burr Brown (a product of Texas Instruments |
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Denon Dn-S3700 Digital Turntable 2 Pack $1798 This DJ packages comes with two Denon DN-S3700 Direct Drive Turntable Media Players and Controllers, portable, single-deck units that provide working DJs with a host of useful features for enhanced creative flexibility. Most notably, thanks to their large 9" spinning platter design, the DN-S3700 turntables literally offer the "best of both worlds" from both digital and analog realms. In addition to a host of advanced digital features, including USB and MIDI control, these sleek and elegant media players includes a built-in authentic vinyl record for surface control driven by Denon DJ's High Torque Direct Drive motor. This provides users with the classic and unmistakable feel of true vinyl.High Torque Direct Drive Motor & Spinning Platter DesignDenon's proprietary 12-pole Direct Drive brushless motor design is keeping the art of the 110-year-old turntable alive & true to its native feel, delivering instant, full-rotation speed with a powerful 2.5 kg/cm of start-up torque within 0.5 seconds for true turntable reaction and response. DJs can perform freely on this 9" platter design mounted with a real vinyl record as if they were using a genuine analog turntable. Platter rotation can be changed between 33 and 45 RPM for comfort. Fast Loading Slot-In DriveThe illuminated, fast-loading, quick-reading slot-in drive reads and supports standard compact audio discs and MP3 discs in a variety of formats: CD, CD-R, CD-RW, CD-ROM. Compact Disc CD-TEXT and MP3 ID3 Tags on CD-ROM are also displayed. USB Device HostingWith easy access to the internet these days, many DJs are shopping from home, purchasing their music collection online and storing these files on to a hard drive. The DN-S3700 is one piece of DJ equipment that is well equipped for the modern DJ and conveniently supports external USB mass storage class devices (USB Hubs are not supported). Connect your iPod (mass storage class iPods only), thumb drive, and large hard drives for easy access to your small or extensive MP3/WAV libraries up to 50,000 files. Simply plug any one of these devices into the Denon DN-S3700 to obtain the powerful on-board features such as Instant Start, Auto Looping, Hot Starts, Effects, 8 ways to file search, and so much more.MIDI Interface Controller (PC/MAC)The DN-S3700 turntable is also designed to interface & control a variety of popular audio/video DJ software applications that support USB MIDI interface, either by user-custom mapping or direct native support by the software vendor. Control your favorite DJ software all from one clever compact player. Supported platforms include Mac OSX 10.4 or higher, Windows XP SP2, Windows Vista. Internal 24-Bit Processing & USB Audio-(sound card)Unlike most dedicated DJ MIDI controllers that are only USB bus-powered, the Denon DN-S3700 encompasses its own internal power supply to achieve the highest electrical specifications, resulting in best possible audio performance. It features high-end Burr Brown (a product of Texas Instruments |
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SOUTHWORTH Low-Profile Disc Turntable - Yellow $1053 One person can rotate heavily loaded pallets. Increase productivity and reduce the chance of muscle strain from reaching and stretching around loads with a SOUTHWORTH Low-Profile Disc Turntable. Fits neatly under hand pallet jack for efficient load transfer. Anti-friction bearings for easy effort and long life. |
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Denon DN-S3700 Digital Turntable Media Player and Controller $699 The Denon DN-S3700 Direct Drive Turntable Media Player and Controller is a solid, single-deck portable DJ instrument that provides working DJs with a host of useful features for enhanced creative flexibility. Most notably, thanks to its large 9" spinning platter design, the DN-S3700 literally offers the "best of both worlds" from both digital and analog realms. In addition to a host of advanced digital features, including USB and MIDI control, the sleek and elegant media player includes a built-in authentic vinyl record for surface control driven by Denon DJ's High Torque Direct Drive motor. This provides users with the classic and unmistakable feel of true vinyl.High Torque Direct Drive Motor & Spinning Platter DesignDenon's proprietary 12-pole Direct Drive brushless motor design is keeping the art of the 110-year-old turntable alive & true to its native feel, delivering instant, full-rotation speed with a powerful 2.5 kg/cm of start-up torque within 0.5 seconds for true turntable reaction and response. DJs can perform freely on this 9" platter design mounted with a real vinyl record as if they were using a genuine analog turntable. Platter rotation can be changed between 33 and 45 RPM for comfort. Fast Loading Slot-In DriveThe illuminated, fast-loading, quick-reading slot-in drive reads and supports standard compact audio discs and MP3 discs in a variety of formats: CD, CD-R, CD-RW, CD-ROM. Compact Disc CD-TEXT and MP3 ID3 Tags on CD-ROM are also displayed. USB Device HostingWith easy access to the Internet these days, many DJs are shopping from home, purchasing their music collection online and storing these files on to a hard drive. The DN-S3700 is well equipped for the modern DJ and conveniently supports external USB mass storage class devices (USB Hubs are not supported). Connect your iPod (mass storage class iPods only), thumb drive, and large hard drives for easy access to your small or extensive MP3/WAV libraries up to 50,000 files. Simply plug any one of these devices into the Denon DN-S3700 to obtain the powerful on-board features such as, Instant Start, Auto Looping, Hot Starts, Effects, 8 ways to file search, and so much more.MIDI Interface Controller (PC/MAC)The DN-S3700 is also designed to interface & control a variety of popular audio/video DJ software applications that support USB MIDI interface, either by user-custom mapping or direct native support by the software vendor. Control your favorite DJ software all from one clever compact player. Supported platforms include Mac OSX 10.4 or higher, Windows XP SP2, Windows Vista. Internal 24-Bit Processing & USB Audio-(sound card)Unlike most dedicated DJ MIDI controllers that are only USB bus-powered, the DN-S3700 encompasses its own internal power supply to achieve the highest electrical specifications, resulting in best possible audio performance. It features high-end Burr Brown (a product of Texas Instruments) 24-bit DAC processing for superior output audio fidelity. The USB Audio i |
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Denon Dn-S3700 Digital Turntable Media Player And Controller $699 The Denon DN-S3700 Direct Drive Turntable Media Player and Controller is a solid, single-deck portable DJ instrument that provides working DJs with a host of useful features for enhanced creative flexibility. Most notably, thanks to its large 9" spinning platter design, the DN-S3700 literally offers the "best of both worlds" from both digital and analog realms. In addition to a host of advanced digital features, including USB and MIDI control, the sleek and elegant media player includes a built-in authentic vinyl record for surface control driven by Denon DJ's High Torque Direct Drive motor. This provides users with the classic and unmistakable feel of true vinyl.High Torque Direct Drive Motor & Spinning Platter DesignDenon's proprietary 12-pole Direct Drive brushless motor design is keeping the art of the 110-year-old turntable alive & true to its native feel, delivering instant, full-rotation speed with a powerful 2.5 kg/cm of start-up torque within 0.5 seconds for true turntable reaction and response. DJs can perform freely on this 9" platter design mounted with a real vinyl record as if they were using a genuine analog turntable. Platter rotation can be changed between 33 and 45 RPM for comfort. Fast Loading Slot-In DriveThe illuminated, fast-loading, quick-reading slot-in drive reads and supports standard compact audio discs and MP3 discs in a variety of formats: CD, CD-R, CD-RW, CD-ROM. Compact Disc CD-TEXT and MP3 ID3 Tags on CD-ROM are also displayed. USB Device HostingWith easy access to the Internet these days, many DJs are shopping from home, purchasing their music collection online and storing these files on to a hard drive. The DN-S3700 is well equipped for the modern DJ and conveniently supports external USB mass storage class devices (USB Hubs are not supported). Connect your iPod (mass storage class iPods only), thumb drive, and large hard drives for easy access to your small or extensive MP3/WAV libraries up to 50,000 files. Simply plug any one of these devices into the Denon DN-S3700 to obtain the powerful on-board features such as, Instant Start, Auto Looping, Hot Starts, Effects, 8 ways to file search, and so much more.MIDI Interface Controller (PC/MAC)The DN-S3700 is also designed to interface & control a variety of popular audio/video DJ software applications that support USB MIDI interface, either by user-custom mapping or direct native support by the software vendor. Control your favorite DJ software all from one clever compact player. Supported platforms include Mac OSX 10.4 or higher, Windows XP SP2, Windows Vista. Internal 24-Bit Processing & USB Audio-(sound card)Unlike most dedicated DJ MIDI controllers that are only USB bus-powered, the DN-S3700 encompasses its own internal power supply to achieve the highest electrical specifications, resulting in best possible audio performance. It features high-end Burr Brown (a product of Texas Instruments) 24-bit DAC processing for superior output audio fidelity. The USB Audio i |
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Bush Turntable with USB Encoding $79.99 Black. 33 and 45 rpm speed turntable. Encoding via PC link. Built-in pre amplifier. Magnetic cartridge. General information: Size of main unit H12, W42.8, D37.6cm. By Bush. |
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Gemini TT-2000 Direct Drive Turntable $136.45 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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Crosley CR712 Autorama Turntable with CD Player and AMFM Radio Red $185.31 The Autorama CD represents a vintage icon mimicking the clean streamlined stylings of a classic 1950 s automobile. From the sleek lines to the chrome grill side mounted speakers this beauty takes you back to the days of driveins and diners but adds a hint of technological advance with a CD player. Crosley s fascination with automobiles is evident right down to the last exacting detail. The Autorama CD features an AM/FM Radio a 3 speed turntable a compact disc player and enough sophistication to render most enthusiasts speechless. Features:. Belt Driven Turntable Mechanism. Plays 3 Speeds 33 1/3 45 And 78 RPM Records. Plays 7 10 amp; 12 Records. Diamond Stylus Needle. CD Player. Programmable 20Track Memory. LCD Display. Repeat Play. AM/FM Radio. Digital Tuner. BuiltIn EQ Presets. External FM Antenna. Digital Volume Control. Dynamic Full Range Stereo Speakers. Individual Function Controls. External Speaker Outputs. Full Function Remote Control |
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Traveler Turntable (Black) $124.94 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. |
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Crosley Traveler Turntable $140.95 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! |
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GDI-VW03 Vinylwriter Boca Turntable $114.95 The Grace Digital VW03 Vinylwriter Boca alows you to record all your vinyl as digital music files and import them into your computer music library. Features: Manufacturer: Grace Digital, Inc Manufacturer Part Number: GDI VW03 Product Name: GDI VW03 Vinylwriter Boca Turntable Product Type: Record Turntable Tone Arm: Automatic Speed: 33.33rpm Ports: RCA Audio Line Out Controls: Volume Status Indicators: LED lights in the legs Dimensions: 5.75" Height x 10.9" Width x 12.2" Depth |
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