FrictionHard
Question
A man of mass 60 kg records his wt. on a weighing machine placed inside a lift. The ratio of wts. of man recorded when lift ascending up with a uniform speed of 2 m/s to when it is descending down with a uniform speed of 4 m/s will be
Options
A.0.5
B.1
C.2
D.none of these
Solution
Net force of reaction act on a body in a lift when it is accelerating. If lift moves up or down with uniform speed then acceleration a = 0,
∴   weight of man =mg is same in ascending hence ratio = 1.
∴   weight of man =mg is same in ascending hence ratio = 1.
Create a free account to view solution
View Solution FreeMore Friction Questions
A large drum having radius $R$ is spinning around its axis with angular velocity $\omega$, as shown in figure. The minim...A body is projected up along the rough inclined plane from the bottom with some velocity. It travels up the incline and ...A system is shown in the figure, which is released from rest. There is no friction between ground and mass 5m. The coeff...Block of mass m is on an inclined plane of angle θ. The coefficient of friction between the block and the plane is ...A uniform rope so lies on a table that part of it lays over. The rope begins to slide when the length of hanging part is...