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CBSE Class 11-science Answered

A truck tows a trailer of mass 1200 kg at a speed of 12 m/s on a level road.The tension in the coupling is 1000N.Find the tension in the coupling when the truck ascends a raod having inclination of sin^-1(1/6).Assume that the frictional resistance on the inclined plane is the same as that on level road.Please explain it to me.
Asked by Samridh Shukla | 08 Oct, 2010, 10:17: AM
answered-by-expert Expert Answer
Dear Student
 
The truck moves at a constant speed of 12 m/s. therefore acceleration = 0.
 
Making a force balance:
 
T - μmg = 0
1000 - μ (1200 x 10) = 0
μ = 1000/12000 = 1/12 = 0.083
 
Now, for the inclination of Θ = sin-1 (1/6) or sinΘ = (1/6), at a constant speed (acceleration = 0):
 
Force balance gives:
T - (friction force + component of mg parallel to incline) = 0
T - (μmg cosΘ) - mg sinΘ = 0
T = (μmg cosΘ) + mg sinΘ
   = (0.083*1200*10*√(35) / 6 ) + (1200*10*1/6)           [cosΘ = √(35) / 6 for sinΘ = 1/6]
   = 2982 N
 
Hope that satisfies your query.
 
Team 
TopperLearning
Answered by | 08 Oct, 2010, 06:50: PM

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