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
Two persons, pull each other through a massless rope in ′tug of war′ game. Who will win ?...A solid hemisphere of weight P rests with its curved surface in contact with a rough inclined plane. A weight Q is place...A contact force exerted by one body on horizontal surface is equal to the normal force (≠ 0) between them. It can ...Two masses m1 = 5kg and m2 = 10kg, connected by an inextensible string over a frictionless pulley, are moving as shown i...A body is projected up along the rough inclined plane from the bottom with some velocity. It travels up the incline and ...