How Does a River Affect Chaining Accuracy in Surveying?

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A river flowing east-west affects chaining accuracy in surveying due to potential measurement discrepancies across the water. In the scenario, a survey line ABC crosses the river perpendicularly, with points B on the near bank and C on the far bank. A line BD, measuring 60 m, is laid at B perpendicular to AB, with bearings for DC and DA measured at 33 degrees 30 minutes and 131 degrees 20 minutes respectively. Given AB is 42 m, the length of BC can be calculated using trigonometric principles. The correct answer for the length of BC is approximately 50.36 m.
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a river is flowing east west and a survey line ABC crosses the river perpendicular to the direction of flow.B is situated on the near bank and C on the far bank.A line BD 60 m long,was laid at B,perpendicular to AB,and the bearing of DC and DA were measured and found to be 33 degrees 30 minutes and 131 degrees 20 minutes respectively.if AB is 42 m .calculate the length of BC.

only post me the sketch and correct answer for that problem.
 
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Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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