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Door Closer

When the door is open and at rest, the door closer exerts a torque of 5.1 . What is the least force that you n?

Assuming the torque is in SI units, then simply using the torque definition:
tau = F*l
where F is the force applied and l is the lever arm or in this case, the width of the door (distance from door handle to door hinge).

Since l isn't provided, solving for F gives 5.1 N-m / l.

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Prime Line Products K 5118 Screen and Storm Door Closer White
Prime Line Products K 5118 Screen and Storm Door Closer White
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S PARKER CONTRACTOR QUALITY 815BC ALUMINUM DOOR CLOSER PICK YOUR COLOR
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Ingersoll Rand Falcon SC81 Commercial Door Closer STD DS 43458 Grade 1 BRASS
Ingersoll Rand Falcon SC81 Commercial Door Closer STD DS 43458 Grade 1 BRASS
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Global Door Controls TC300 Door closer O1
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Residential Door Closer Safety  Convenience Ivory Color New Factory Sealed
Residential Door Closer Safety Convenience Ivory Color New Factory Sealed
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New in Box Yale Door Closer 3521 Holder Stop Aluminum 689 Finish
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STB Storm Door Closer Pneumatic Heavy Duty Gold
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NEW Yale 3501XSN Delayed Action DOOR CLOSER 689 Finish Aluminum 3501
NEW Yale 3501XSN Delayed Action DOOR CLOSER 689 Finish Aluminum 3501
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STANLEY RYOBI CLD 3550 EDA 689SN NOS DOOR CLOSER
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MINTCRAFT C102 BH SA BR Residential Door Closer Brown 6 Pack
MINTCRAFT C102 BH SA BR Residential Door Closer Brown 6 Pack
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STANLEY RYOBI CLD 3551 689 SN NOS DOOR CLOSER
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STANLEY RYOBI CLD 3550H EDA689SN NOS DOOR CLOSER
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STANLEY RYOBI CLD 3550H EDA690SN NOS DOOR CLOSER
STANLEY RYOBI CLD 3550H EDA690SN NOS DOOR CLOSER
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National N213 280 Hydraulic Door Closer White NEW IN PACKAGE KC20
National N213 280 Hydraulic Door Closer White NEW IN PACKAGE KC20
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STANLEY RYOBI CLD 4550 EDA689SN NOS DOOR CLOSER
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Sargent Door Closer
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Global Door Controls Commercial Door Closer in Duronotic with Backcheck  LB 53
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Old VTG Original Norton Hydralic Adjustable HD Aluminum Industrial Door Closer
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65 85 Kgs New Commercial Hydralic Door Closer Silver Aluminium Alloy US SUPPLIER
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Falcon Security Door Closer SC60 SC71 SC80 SEE PICTURES MISSING PARTS
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Tell Manufacturing DC100022 12644 Commerical Aluminum Door Closer Grade 1 Size
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LCN 62PA DOOR CLOSER PARALLEL ARM BRACKET 689 aluminum For 4040 4040xp 1460
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LCN 62PA DOOR CLOSER PARALLEL ARM BRACKET 694 Dark Bronze 4040 4040xp 1460
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Hager Commercial Spring Hinge 45 x 4 1 2 Door Closer US26D Satin Chrome
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3 pack Commercial Spring Hinge 45 x 4 1 2 Door Closer US26D Satin Chrome
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3 pack Commercial Spring Hinge 45 x 4 1 2 Door Closer US26D Satin Chrome
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