Question

4.A motor cyclist (to be treated as a
point mass) is to undertake horizontal
circles inside the cylindrical wall of a
well of inner radius 4m. Coefficient of
static friction between tyre and wall
is 0.4. The minimum speed to
perform this stunt is (use g=10m/s2) *
*
O 1m/s
O v10 m/s
O 100m/s
O 10m/s​

Answer 1

Answer:

option d is right answer

Explanation:

10m/s

Answer 2

Answer:

Given data:

cylindrical well of radius r=6.05 

Coefficient of friction is μ=0.5 

Mass of the artist is m=50kg 

What we have to find out :-

1) how much minimum speed should the stunt artist maintain Vmin= ? 

2) How much will the force of friction be if she / he increase the speed by 20%= ? 

The minimum velocity to maintain motion is given by 

v=μrg 

Vmin=0.56.05×10     ........ [g=10m/s2] 

=121 

Vmin=11m/s 

In well of death , the force of friction is depend on weight, you can refer from figure in textbook, hence we get, 

f=fs=mg=50×10 

f=500N