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Laws Of Motion

Question
CBSEENPH11017050

A curved road of diameter 1.8 km is banked so that no friction is required at a speed of 30 m/s. What is the banking angle? 

Solution

Diameter, 2 r = 1.8 km = 1800 m 
r = 1800/2 = 900 m 
Speed, v = 30 m/s
Banking angle, straight theta = ? 
We know that, 
tan space straight theta space equals space fraction numerator straight v squared over denominator straight r space straight g end fraction space equals space fraction numerator 300 space straight x space 30 over denominator 900 space straight x space 9.8 end fraction space equals space 0.102

That space is comma space

straight theta space equals space 6 to the power of straight o