You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Physics

2nd Equation of Motion

A boy is sitt...

Question

A boy is sitting on a horizontal platform in the shape of a disc at a distance of $5 m$ from its center. The boy begins to slip when the speed of wheel exceeds $10 r p m$ . The coefficient of friction between the boy and platform is ( $g = 10 {m s}^{- 2}$ )

π^{2} / 6

No worries! We‘ve got your back. Try BYJU‘S free classes today!

π^{2} / 18

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

π / 6

No worries! We‘ve got your back. Try BYJU‘S free classes today!

π / 2

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B $π^{2} / 18$
$w = 10 \times \frac{2 π}{60} r a d / s w = \frac{π}{3} r a d / s r = 5 m m w^{2} r = μ m g = f μ = \frac{π^{2}}{18}$

Suggest Corrections

Similar questions

Q. A boy of mass

60 k g

is standing over a platform of mass

40 k g

placed over a smooth horizontal surface. He throws a stone of mass

1 k g

wth velocity

u = 10 m / s

at an angle of

45^{o}

with respect to ground. The displacement of platform (With boy) on the horizontal surface when the stone lands on the ground is (

g = 10 m / s^{2}

Q. A boy of mass

60 K g

is standing over a platform of mass

40 K g

placed over a smooth horizontal surface. He throws a stone of mass

1 K g

with velocity

v = 10 m / s

at an angle of

45^{o}

with respect to the ground. Find the displacement of the platform (with boy) on the horizontal surface when the stone lands on the ground. (

g = 10 m / s

)

Q. A boy pulls a

5 k g

block along a

20 m

long horizontal surface at a constant velocity by applying a horizontal force

F

. If the coefficient of kinetic friction is

0.2

, how much work does the boy do on the block? (

g = 10 m s^{- 2}

)

Q. A boy of mass

M

stands at the edge of a circular platform of radius

R

capable of rotating freely about its axis. The moment of inertia of the platform about the axis is

I

. The system is at rest. A friend of the boy throws a ball of mass

m

with a velocity

v

horizontally. The boy on the platform catches it when it passes tangentially to the platform. Find the angular velocity of the system after the boy catches the ball.

Q. A boy pulls a 5 kg block along a 20 m long horizontal surface at a constant velocity by applying a horizontal force

F

. If the coefficient of kinetic friction is 0.2, how much work does the boy do on the block? (

g = 10 m s^{- 2}

)

Join BYJU'S Learning Program

A boy is sitting on a horizontal platform in the shape of a disc at a distance of 5m from its center. The boy begins to slip when the speed of wheel exceeds 10rpm. The coefficient of friction between the boy and platform is (g=10ms−2)

The correct option is B π2/18w=10×2π60rad/sw=π3rad/sr=5mmw2r=μmg=fμ=π218

A boy is sitting on a horizontal platform in the shape of a disc at a distance of $5 m$ from its center. The boy begins to slip when the speed of wheel exceeds $10 r p m$ . The coefficient of friction between the boy and platform is ( $g = 10 {m s}^{- 2}$ )

The correct option is B $π^{2} / 18$
$w = 10 \times \frac{2 π}{60} r a d / s w = \frac{π}{3} r a d / s r = 5 m m w^{2} r = μ m g = f μ = \frac{π^{2}}{18}$