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Question Number 16015 by chux last updated on 16/Jun/17

Two horses pull horizontally on  ropes attached to a stump.The  two forces F and T that they  applied to the stump are such that  the resultant R has a magnitude  equal to F and makes an angle of  90° with F.Let F=1300N and   R=1300N.Find the value of T.

$$\mathrm{Two}\:\mathrm{horses}\:\mathrm{pull}\:\mathrm{horizontally}\:\mathrm{on} \\ $$$$\mathrm{ropes}\:\mathrm{attached}\:\mathrm{to}\:\mathrm{a}\:\mathrm{stump}.\mathrm{The} \\ $$$$\mathrm{two}\:\mathrm{forces}\:\mathrm{F}\:\mathrm{and}\:\mathrm{T}\:\mathrm{that}\:\mathrm{they} \\ $$$$\mathrm{applied}\:\mathrm{to}\:\mathrm{the}\:\mathrm{stump}\:\mathrm{are}\:\mathrm{such}\:\mathrm{that} \\ $$$$\mathrm{the}\:\mathrm{resultant}\:\mathrm{R}\:\mathrm{has}\:\mathrm{a}\:\mathrm{magnitude} \\ $$$$\mathrm{equal}\:\mathrm{to}\:\mathrm{F}\:\mathrm{and}\:\mathrm{makes}\:\mathrm{an}\:\mathrm{angle}\:\mathrm{of} \\ $$$$\mathrm{90}°\:\mathrm{with}\:\mathrm{F}.\mathrm{Let}\:\mathrm{F}=\mathrm{1300N}\:\mathrm{and}\: \\ $$$$\mathrm{R}=\mathrm{1300N}.\mathrm{Find}\:\mathrm{the}\:\mathrm{value}\:\mathrm{of}\:\mathrm{T}. \\ $$

Commented by chux last updated on 17/Jun/17

please help... its urgent.

$$\mathrm{please}\:\mathrm{help}...\:\mathrm{its}\:\mathrm{urgent}. \\ $$

Answered by mrW1 last updated on 17/Jun/17

T=1300×(√2)    as vector  R=F+T  1300j=1300i+T  ⇒T=−1300i+1300j  T=1300(√2)

$$\mathrm{T}=\mathrm{1300}×\sqrt{\mathrm{2}} \\ $$$$ \\ $$$$\mathrm{as}\:\mathrm{vector} \\ $$$$\boldsymbol{\mathrm{R}}=\boldsymbol{\mathrm{F}}+\boldsymbol{\mathrm{T}} \\ $$$$\mathrm{1300j}=\mathrm{1300i}+\boldsymbol{\mathrm{T}} \\ $$$$\Rightarrow\boldsymbol{\mathrm{T}}=−\mathrm{1300i}+\mathrm{1300j} \\ $$$$\mathrm{T}=\mathrm{1300}\sqrt{\mathrm{2}} \\ $$

Commented by chux last updated on 18/Jun/17

thanks so much...

$$\mathrm{thanks}\:\mathrm{so}\:\mathrm{much}... \\ $$

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