FrictionHard

Question

A body initially at rest and sliding along a frictionlesstrack from a height h (as shown in the figure) just completes a vertical circle of diameter AB = D. The height h is equal to :-

Options

A.

32D

B.

D

C.

75D

D.

54D

Solution

To complete a vertical circle, speed at A should be
vA=5gR
using energy conservation
mgh =12mvA2
h=12vA2g=1 5g D2 g 2=       R=D2
h=5D4

Create a free account to view solution

View Solution Free
Topic: Friction·Practice all Friction questions

More Friction Questions

Two masses A and B of 10 kg and 5 kg respectively are connected with a string passing over a frictionless pulley fixed a...The upper half of an inclinded plane of inclination θ is perfectly smooth while lower half is rough. A block starti...Starting from rest, A flat car is given a constant acceleration ao = 2 m/s2. A cable is connected to a crate A of mass 5...Two identical blocks of same masses are placed on a fixed wedge as shown in figure. Coefficient of friction between all ...A block of mass 2 kg is given a push horizontally and then the block starts sliding over a horizontal plane. The figure ...