A vertical wind screen has an upper pane A , 30 cm long, hinged at the top and covering 5 cm of the lower pane B . The car runs at 60 km/hr in rain falling vertically at 20 km/hr. The maximum angle th

Question

A vertical wind screen has an upper pane A , 30 cm long, hinged at the top and covering 5 cm of the lower pane B . The car runs at 60 km/hr in rain falling vertically at 20 km/hr. The maximum angle through which A can be opened outward without rain entering is about:

TestHub · Accepted Answer

B 's top edge is 25 cm below the hinge; 30 cos θ + 10 sin θ = 25 , i.e. 3 cos θ + sin θ = 2.5 ; 10 ​ cos ( θ − 18.4 3 ∘ ) = 2.5 gives θ = 18.4 3 ∘ + 37. 8 ∘ = 56. 2 ∘ .

Physics - Kinematics Question with Solution | TestHub

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