General Dynamics
Posted in Aircraft Model by admin
on April 27, 2008
General dynamics question?
Hi, I'm looking at a question with a punching bag initially at rest, and I'm asked to determine the angular acceleration when it is hit with a force. Apparently, since it starts from rest, omega = 0. In the calculation, only the tangential component of the acceleration is used (r*alpha). How can there be an initial angular acceleration, but no initial omega? Why is the normal component of the acceleration omitted (a_n = r*omega^2), wouldn't a_n use the omega at the instant the force is applied to the bag?
Thanks.
Centripetal acceleration will be zero at the beginning because the object is not moving yet. You need circular motion to have the centripetal acceleration going. So, yes, at the moment you punch the bag (at t=0) there will ONLY be tangential acceleration and angular acceleration. The initial angular velocity will be zero and hence the centripetal acceleration will be zero. Of course, once the things are in motion (t>0), they won't be zero.
 |
 1 48 MASTER MODEL AM48047 PITOT TUBE GENERAL DYNAMICS F 111 AARDVARK PROMOTION $3.99 Time Remaining: 1h 49m |
 1 72 Hasegawa General Dynamics F 16A Plus Fighting Falcon $6.00 Time Remaining: 12h 14m |
 1976 REVELL GENERAL DYNAMICS F 16A 1 72 MODEL 2 VERSION KIT SEALED $59.99 Time Remaining: 16h 48m Buy It Now for only: $59.99 |
 Vintage white plastic General Dynamics USAF F 16A 115x475 $57.00 Time Remaining: 19h 43m Buy It Now for only: $57.00 |
 AMT ERTL GENERAL DYNAMICS F 16C BLOCK 40 MODEL JET NIB $18.74 Time Remaining: 20h 51m Buy It Now for only: $18.74 |
 General Dynamics F 16C Fighting Falcon 172 Hasewaga 603 MY14P28 $12.95 Time Remaining: 21h 20m |
 Hasegawa General Dynamics F 16A Fighting Falcon Thunderbirds 1 72 scale model ki $10.95 Time Remaining: 22h 14m |
 Minicraft Hasegawa 1 72nd General Dynamics F 16D Falcon kit $5.59 (4 Bids) Time Remaining: 22h 36m |
 ACADEMY 1 48 scale AARDVARK General Dynamics F 111E Bomber WHISPERING DEATH 1689 $37.72 Time Remaining: 23h 56m Buy It Now for only: $37.72 |
 ACADEMY 1 48 scale Military USAF AARDVARK General Dynamics F 111A Model Kit NEW $37.72 Time Remaining: 1d 2h 44m Buy It Now for only: $37.72 |
 Hobby Craft 1 144 F 16A USAF General Dynamics NIB $5.00 Time Remaining: 1d 11h 12m Buy It Now for only: $5.00 |
 MONOGRAM General Dynamics Grumman EF 11A Raven 1 72 5435 1984 issue $3.95 Time Remaining: 1d 15h 15m Buy It Now for only: $7.95 |
 RARE GENERAL DYNAMICS F111 FIGHTER VENDER DESKTOP MODEL $19.95 (1 Bid) Time Remaining: 1d 18h 59m |
 Vintage 1 72 Revell General Dynamics F 111 Tactical Fighter TFX 1966 kit NIOB $19.95 Time Remaining: 1d 20h 16m |
 Vintage 1 72 Minicraft General Dynamics YF 16 or F 16A Fighting Falcon NIOB $14.95 Time Remaining: 1d 20h 16m |
 Academy Cold War General Dynamics F 111 F 148 scale Pauls Pristine Plastic NEW $19.95 Time Remaining: 1d 21h 52m Buy It Now for only: $24.95 |
 Academy Cold War General Dynamics EF 111 A 148 scale Pauls Pristine Plastic NEW $19.95 Time Remaining: 1d 21h 59m Buy It Now for only: $24.95 |
 Hasegawa 1 72nd General Dynamics F 111E Aardvark kit $8.50 (6 Bids) Time Remaining: 1d 22h 14m |
 Hasegawa 1 72nd General Dynamics F 16A Plus Falcon kit $0.99 Time Remaining: 1d 22h 19m |
 AMT General Dynamics F 16A Fighting Falcon USAF 1 72 $7.99 Time Remaining: 2d 11h 45m |
 Monogram General Dynamics EF 111 Raven USAF 1 72 $7.99 Time Remaining: 2d 11h 45m |
 VINTAGE HELLER 1 72sc General Dynamics F 16A B FIGHTING FALCON Model Kit $15.50 Time Remaining: 2d 15h 50m |
 HASEGAWA GENERAL DYNAMICS F 16B PLUS FIGHTING FALCON 1 72 MINT SEALED IN BOX $1.50 (2 Bids) Time Remaining: 2d 20h 9m |
 ESCI ERTL 1 72 GENERAL DYNAMICS EF 111A RAVEN 9072 NEW $1.95 Time Remaining: 2d 21h 1m |
 General Dynamics F 16 Fighter 148 Tamiya 61022 MY16P26 $14.95 Time Remaining: 2d 21h 20m |
 MATCHBOX General Dynamics F 16A B 172 Scale Model Kit NEW SEALED $9.99 Time Remaining: 2d 21h 43m Buy It Now for only: $19.99 |
 ZHENGDEFU USAF EF 111A General Dynamics Raven Fighter Model Kit NEW SEALED $9.99 Time Remaining: 2d 22h 46m Buy It Now for only: $19.99 |
 Vintage HASAGAWA 1 72 USAF General Dynamics F 16D FIGHTING FALCON Model Kit $14.50 Time Remaining: 2d 23h 7m |
 ACADEMY F16 AC GENERAL DYNAMICS FIGHTER JET $15.99 Time Remaining: 3d 1h 57m |
 Airfix 1 72 HO General Dynamics F 111E Old i $11.99 Time Remaining: 3d 7h 6m Buy It Now for only: $11.99 |
 LS A115 1 144 General Dynamics F 16 Prototype Falcon Plastic Model Kit $11.69 Time Remaining: 3d 11h 32m Buy It Now for only: $11.69 |
 LS A120 1 144 General Dynamics F 16A Fighting Falcon Plastic Model Kit $11.69 Time Remaining: 3d 11h 34m Buy It Now for only: $11.69 |
 Techmod Decals 1 32 GENERAL DYNAMICS F 16 BLOCK 52+ $11.99 Time Remaining: 3d 13h 44m Buy It Now for only: $11.99 |
 1 72 MASTER MODEL AM72030 PITOT TUBE for GENERAL DYNAMICS F 111 AARDVARK $4.49 Time Remaining: 3d 17h 35m Buy It Now for only: $4.49 |
 Vintage General Dynamics F 16A 1 32 Scale Minicraft Hasegawa $29.99 Time Remaining: 3d 20h 17m |
 Monogram 1 72 General Dynamics Grumann EF 111 Raven Airplane Model $0.99 Time Remaining: 3d 21h 17m |
 USAF General Dynamics F 106A Delta Dart 172 Hasegawa 1054 MY17P20 $9.95 Time Remaining: 3d 21h 19m |
 Tamiya 60701 1 72 General Dynamics F 16 Fighting Falcon Model Kit $10.80 Time Remaining: 4d 6h 8m Buy It Now for only: $10.80 |
 Hobby Boss 1 48 General Dynamics EF 111 Raven $74.92 Time Remaining: 4d 6h 40m Buy It Now for only: $74.92 |
 Hobby Boss 1 48 General Dynamics F 111A Aardvark $74.92 Time Remaining: 4d 6h 40m Buy It Now for only: $74.92 |
 Hobby Boss 1 48 General Dynamics FB 111 Aardvark $84.78 Time Remaining: 4d 6h 40m Buy It Now for only: $84.78 |
 1988 AMT Ertl General Dynamics F 16A Fighting Falcon No 8800 Model Kit $14.99 Time Remaining: 4d 8h 34m Buy It Now for only: $14.99 |
 General Dynamics F 16 Falcon Mfg 1982 $9.91 Time Remaining: 4d 22h 3m Buy It Now for only: $9.91 |
 ACADEMY 1676 KIT 1 48 General Dynamics EF 111A RAVEN $56.99 Time Remaining: 5d 7h 20m Buy It Now for only: $56.99 |
 GENERAL DYNAMICS F 106A DELTA DART PLASTIC MODEL by HASEGAWA 1 72 SCALE + NEW $19.99 Time Remaining: 5d 17h 49m Buy It Now for only: $19.99 |
 1 48 F 16 US FIGHTER GENERAL DYNAMICS TAMIYA NEW $49.95 Time Remaining: 5d 18h 44m Buy It Now for only: $49.95 |
 1 72 GENERAL DYNAMICS EF 111A RAVEN REVELL NEW $29.95 Time Remaining: 5d 18h 50m Buy It Now for only: $29.95 |
 1 72 GENERAL DYNAMICS F 111E AIRFIX NEW $19.99 Time Remaining: 5d 19h 34m Buy It Now for only: $19.99 |
 General Dynamics F 106A Delta Dart 1 72 Hasegawa $9.75 Time Remaining: 5d 19h 52m |
 1 72 RAAF Decals General Dynamics F 111 PIG 1973 2010 Farewell $16.72 Time Remaining: 5d 23h 34m Buy It Now for only: $16.72 |
 Special Hasegawa 1 48 General Dynamics F 16C Fighting Falcon USAF V3 $34.90 Time Remaining: 6d 8h 29m Buy It Now for only: $34.90 |
 172 GENERAL DYNAMICS F 111E AIRFIX 4008 $14.14 Time Remaining: 6d 17h 15m Buy It Now for only: $14.14 |
 1976 Revell 1 72 scale USAF General Dynamics F 16A + Acc Model Kit $49.99 Time Remaining: 6d 17h 50m |
 Hasegawa 1 72 Scale General Dynamics F 16N Top Gun Kit No 718 $12.99 Time Remaining: 7d 10h 13m Buy It Now for only: $12.99 |
 1 48 MASTER MODEL AM48047 PITOT TUBE for GENERAL DYNAMICS F 111 AARDVARK $5.49 Time Remaining: 7d 13h 5m Buy It Now for only: $5.49 |
 General Dynamics F 111 AARDVARK Variable Sweep Wing Jet Aero Series 29 $12.99 Time Remaining: 7d 15h 33m Buy It Now for only: $12.99 |
 Academy 1 48 General Dynamics FB 111A Strategic Bomber $26.00 Time Remaining: 7d 16h 36m Buy It Now for only: $26.00 |
 GENERAL DYNAMICS F 16A FIGHTING FALCON 1 144TH SCALE $5.99 Time Remaining: 7d 21h 44m Buy It Now for only: $5.99 |
 Techmod Decals 1 72 GENERAL DYNAMICS F 16C F 16D $6.99 Time Remaining: 8d 11h 30m Buy It Now for only: $6.99 |
 LEE GENERAL DYNAMICS 1 144 Scale Model Kit NEW On SALE $4.99 Time Remaining: 9d 1m Buy It Now for only: $4.99 |
 ESCI General Dynamics F 16B 1983 Vintage Jet Kit $27.00 Time Remaining: 10d 1h 30m Buy It Now for only: $27.00 |
 General Dynamics F 16XL 1 144 LS Model Kit 1054 Started $4.00 Time Remaining: 10d 21h 7m Buy It Now for only: $4.00 |
 General Dynamics F 16C Block 52+ Paper Model Kit in Scale 133 $8.99 Time Remaining: 11d 2h 38m Buy It Now for only: $8.99 |
 Syhart Decals 1 72 GENERAL DYNAMICS F 16A B FALCON Belgian Air Force $10.99 Time Remaining: 11d 12h 25m Buy It Now for only: $10.99 |
 Airfix MPC 1 72 HO General Dynamics F 16 Falcon i $17.99 Time Remaining: 12d 8h 53m Buy It Now for only: $17.99 |
 1144 F 111C General Dynamics REVELL 4003 $8.83 Time Remaining: 12d 13h 15m Buy It Now for only: $8.83 |
 GENERAL DYNAMICS F 111E ARDVARK WARPLANES OF THE WORLD $4.99 Time Remaining: 12d 16h 47m Buy It Now for only: $4.99 |
 Vintage 1 48 Tamiya General Dynamics F 16 Fighting Falcon Prototype Fighter $24.95 Time Remaining: 13d 58m Buy It Now for only: $24.95 |
 Hasegawa 1 32 General Dynamics F 16A FIGHTING FALCON Model Kit New Sealed $64.99 Time Remaining: 13d 19h 8m Buy It Now for only: $64.99 |
 New PM Fighting falcon F 16 GD Model Airplane Kit 172 Plastic General Dynamics $9.95 Time Remaining: 14d 12h 31m Buy It Now for only: $9.95 |
 1 72 Anigrand GENERAL DYNAMICS A 12 AVENGER II Fighter Prototype $48.99 Time Remaining: 14d 14h 25m Buy It Now for only: $48.99 |
 Academy General Dynamics EF 111A Raven 1 48 scale unbuilt kit FA066 $32.00 Time Remaining: 14d 20h 34m Buy It Now for only: $32.00 |
 1 72 Mach 2 GENERAL DYNAMICS RB 57 Bomber $64.99 Time Remaining: 15d 19h 14m Buy It Now for only: $64.99 |
 Airfix 1 72 HO General Dynamics F 111E Old Series 4 $15.99 Time Remaining: 15d 22h 29m Buy It Now for only: $15.99 |
 1 48 ACADEMY GENERAL DYNAMICS FB 111A AARDVARK 1648 NIB FREE SHIPPING $29.95 Time Remaining: 16d 7h 30m Buy It Now for only: $29.95 |
 1 48 ACADEMY GENERAL DYNAMICS F 111A ATTACK BOMBER 1647 FREE SHIPPING $29.95 Time Remaining: 16d 7h 30m Buy It Now for only: $29.95 |