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Door Pull

how can i estimate the force needed to open a door?

hey guys,
at school my teacher gave me homework: the homework is to estimate the force needed to open a door(pull down a door handle)
but i only have the distance of the door handle, how can i find out the force without the moment???

Is this an existing door and handle? Have you used the handle and can make an estimate of the force needed to pull it down? If U have used the handle...press on a bathroom scale to mimic the force and estimate it, perhaps?

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3 Cal Royal Pocket Sliding Door Pulls Passage Polished Brass US3 NOS
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STANLEY CD2914 POLISHED CHROME FLUSH SLIDING DOOR PULL
STANLEY CD2914 POLISHED CHROME FLUSH SLIDING DOOR PULL
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Ives 8103 8 8 Door Pull 1 Round Satin Brass
Ives 8103 8 8 Door Pull 1 Round Satin Brass
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Cal Royal 9800DTP Exterior Door Pull Plate Satin Brass
Cal Royal 9800DTP Exterior Door Pull Plate Satin Brass
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Schlage Abrz Pass Pkt Door Pull
Schlage Abrz Pass Pkt Door Pull
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National Sn Priv Pocket Door Pull
National Sn Priv Pocket Door Pull
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SK9069 Prime Line Products N7319 Pocket Door Privacy Lock Pull Classic Bronze
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NEW Prime Line 3 3 4in Classic Bronze Pocket Door Privacy Lock With Pull N 7368
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NO1 Wright Products VIL333BL Black Villa Pull Handle Latch
NO1 Wright Products VIL333BL Black Villa Pull Handle Latch
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Pair of Solid Brass Commercial Door Pulls Handles
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Polished Stainless 10 Single Offset Door Pull
Polished Stainless 10 Single Offset Door Pull
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Dark Bronze 10 Single Sided Offset Door Pull
Dark Bronze 10 Single Sided Offset Door Pull
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Dorma 12 Inch Polished Chrome Door Pull Handle Rounded Corners NIB
Dorma 12 Inch Polished Chrome Door Pull Handle Rounded Corners NIB
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Prime Line Products N 7367 Pocket Door Privacy Lock with Pull 3 3 4 Inch Satin
Prime Line Products N 7367 Pocket Door Privacy Lock with Pull 3 3 4 Inch Satin
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LARGE Utility Door Pull 6 1 2 SATI N BRASS DOOR PULL FREE SHIPPING
LARGE Utility Door Pull 6 1 2 SATI N BRASS DOOR PULL FREE SHIPPING
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5 PACK LARGE Utility Door Pull 6 1 2 SATI N BRASS DOOR PULL FREE SHIPPING
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25 PACK LARGE Utility Door Pull 6 1 2 SATI N BRASS DOOR PULL FREE SHIPPING
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Rockwood 112BTB532D Stainless Steel Straight Solid Door Pull Set for 1 3 4 Met
Rockwood 112BTB532D Stainless Steel Straight Solid Door Pull Set for 1 3 4 Met
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Rockwood 13110B Bronze Surface Mounted Cast Door Pull 7 1 2 Length Satin Oxi
Rockwood 13110B Bronze Surface Mounted Cast Door Pull 7 1 2 Length Satin Oxi
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Rockwood 13132D Stainless Steel Surface Mounted Cast Door Pull 7 1 2 Length
Rockwood 13132D Stainless Steel Surface Mounted Cast Door Pull 7 1 2 Length
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Rockwood 89026D Brass Pocket Door Pull 2 1 2 Width x 2 3 4 Height Satin Chr
Rockwood 89026D Brass Pocket Door Pull 2 1 2 Width x 2 3 4 Height Satin Chr
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Rockwood 1313 Brass Surface Mounted Cast Door Pull 7 1 2 Length Polished Cle
Rockwood 1313 Brass Surface Mounted Cast Door Pull 7 1 2 Length Polished Cle
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 ALUMINUM STOREFRONT GLASS DOOR STAINLESS STEEL 19 inch PULL HANDLE
ALUMINUM STOREFRONT GLASS DOOR STAINLESS STEEL 19 inch PULL HANDLE
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Stainless Steel Door Handle 9cm Semi circular Flush Recessed Pulls
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Dark Bronze 2 Round Push Pull Set Etched Aluminum
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Dark Bronze Extruded Aluminum Pull Handle
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