Rope Pulley
A boat is pulled into a dock by a rope attached to the bow (“front”) of the boat and passing through a pulley?
A boat is pulled into a dock by a rope attached to the bow (“front”) of the boat and passing through a pulley on the dock that is 1 m higher than the bow of the boat. If the rope is pulled in at a rate of 1 m/s, how fast is the boat approaching the dock when it is 8 m from the dock?
Its a fixed pulley as its mentioned that pulley is at dock. So there is no mechanical advantage.
Now we can construct a triangle with 1m height and 8m base. And then calculate the angle between them.
In our case its tan-1 (1/8) = 7.125
Now we can resolve the rope speed (1m/s) along ground (along 8m base, that is the relative velocity with respect to dock)
Then speed at which boat approaching dock is 1 x cos (7.125) = 0.992 m/s
Speed will get reduced as the boat approaching dock further as the angle increasing.
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Nautical Solid Brass Marine Ship Rope Pulley keychain – Gift £3.99 |
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Horze Lunge Training Aid 1sz BNIB Rope and Pulley type £28.45 |
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2 NEW 2 Ton Poly Rope Hoist Pulley Wheel Block & Tackle £27.05 |
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2.5m Garden Patio Parasol/Umbrella & Rope Pulley Wooden £25.99 |
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PETZL PRO TRAXION LOCKING CLIMBING ROPE CLAMP PULLEY £74.99 |
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Swivel Hook Single Rope Lifting Pulley Load 0.05 Ton £3.48 |
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GENERAL PURPOSE NATURAL COCONUT JUTE ROPE CORD PULLEY CLOTH AIRERS – 15 MTR £4.99 |
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GENERAL PURPOSE NATURAL COCONUT JUTE ROPE CORD PULLEY CLOTH AIRERS – 15 MTR £5.50 |
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Villiers rope pulley cover £4.99 |
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Print over 125 years old Rope Types of Pulley Wheel £31.95 |
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Pulley Line clothes airers ceiling rack cotton rope 30 metres Everlasto £7.75 |
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Villiers rope pulley cover heavy duty. £4.99 |
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Villiers rope pulley cover £4.99 |
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Mercury outboard motor recoil rope pulley 40/50HP New £8.99 |
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Rope Pulley £4.99 |
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ROPE and PULLEY TRAINING AID COMPLETE with ROLLER.COB.size..free gift £46.95 |
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Rope and Pulley Training Aid ONE SIZE.FITS ANY.+ FREE GIFT. £28.95 |
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PESSOA replacement BREACHING BAND for rope and pulley training aid.. £11.95 |
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30 METRES COTTON WASHING / PULLEY CLOTHES ROPE £6.99 |
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Vintage Old Industrial BLOCK AND TACKLE ROPE HOOK Nautical Ship’s Rustic Pulley £22.14 |
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4MM PCP 10/15/20/25/30 METRE COTTON ROPE PULLEY CLOTHES LINE TRADITIONAL WASHING £3.49 |
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4MM PCP 10/15/20/25/30 METRE COTTON ROPE PULLEY CLOTHES LINE TRADITIONAL WASHING £4.99 |
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4MM PCP 10/15/20/25/30 METRE COTTON ROPE PULLEY CLOTHES LINE TRADITIONAL WASHING £5.99 |
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4MM PCP 10/15/20/25/30 METRE COTTON ROPE PULLEY CLOTHES LINE TRADITIONAL WASHING £6.99 |
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4MM PCP 10/15/20/25/30 METRE COTTON ROPE PULLEY CLOTHES LINE TRADITIONAL WASHING £7.99 |
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HEAVY DUTY GLAVANISED ROPE WITH PULLEY ETC approx 85metres £9.99 |
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CS Rope & Pulley Horse Training Aid one size £37.74 |
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Perko Rope Pulleys P/N 634-DP £18.98 |
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New French PESSOA style PULLEY & ROPE training aid £37.50 |
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PETZL PARTNER ULTRA COMPACT ROPE PULLEY P52A £29.99 |
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10mm x 10M QUALITY STRONG BRAIDED NATURAL COTTON ROPE/SASH CORD/PULLEY £9.99 |
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Vintage Attwood Seaflite TILLER ROPE CLAMP Boat Cable Pulley Steering Sea Flight £6.32 |
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Yale XTC Rope 37mtrs, Stein PULLEY HITCH CLIMBER setup & 2 Mammut Carabiners £51.00 |
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Aluminum Boat 6 FAIRLEAD TILLER ROPE GUIDES Eye Hardware Pulley Cable Steering £7.59 |
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Aluminum Boat 6 FAIRLEAD TILLER ROPE GUIDES Eye Hardware Pulley Cable Steering £7.59 |
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Aluminum Boat 6 FAIRLEAD TILLER ROPE GUIDES Eye Hardware Pulley Cable Steering £7.59 |
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Aluminum Boat 6 FAIRLEAD TILLER ROPE GUIDES Eye Hardware Pulley Cable Steering £7.27 |
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LARGE 5″/125MM STEEL WASHING LINE CLOTHES WHEEL PULLEY Outdoor/Block/Rope/Cable £4.99 |
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PETZL SWIVEL CLIMBING ARBORIST ROPE PULLEY – LARGE £48.99 |
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Vintage OMC Johnson Evinrude Outboard Boat Motor Starter Pulley and Rope 376425 £12.65 |
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Pulley handle and 2 metre rope £3.99 |
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CAST IRON PULLEY/ SHEAVE / 70mm DIAMETER – 8MM ROPE £4.99 |
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DOUBLE BLOCK SAILING Sterling Silver Charm Pendant PULLEY FOR ROPES YACHTING £28.69 |
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Pulley Rope Roll Small Roll Colour black £16.99 |
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clansman racal radio mast guy rope new with pulley £14.99 |
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Playmobil Spare parts Wagon pin wigs guns hats dagger hinge pulley bowsprit £1.40 |
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36m COIL OF 8mm POLYESTER ROPE/SASH CORD/PULLEY LINE £7.99 |
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10 x WASHING LINE CLEAT HOOK TRAILER ROPE HOOK TIEBACK 4″ pulley line hook £5.99 |
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180Kg CARGO LIFTING PULLEY SET rope winch hoist puller £6.53 |
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SPARE PARTS FOR STIHL TS400 STARTER ROPE PULLEY,RECOIL STARTER ROTA,TS410 PULLEY £2.67 |
simple rope lock for a pulley system