1reply !!!!!!!
a track consists of two circular parts ABC and CDE of equal radii 100m.a cycle weighing 100 kg together with rider travels at a constant speed of 18km/h on track.what shud be the minimum friction coefficient b/w road and tyre.
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9 Answers
9tangential acc is 0 always
let vector from centre inclined at θ with vertical
μN ≥ mgsinθ
N= |mgcosθ - mv2/r|
μ ≥| sinθ/(cosθ - 1/40)|
this is max wen θ = 45 (at A)
μ≥40/40 -√2
1N= |mgcosθ - mv2/r|.............
Y U TOOK THIS Y NOT N= |mgcosθ + mv2/r|
1n one more thing y u took
μN ≥ mgsinθ...why inequality for zero tangential acceleartion = shud be there
9#7 they r opposite wen θ acute
and same direction wen θ obtuse
both these facts are contained in taking
N= |mgcosθ - mv2/r|.............
#8 bcos friction can adjust itself to a lesser value if required