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Physics Part-I

Laws of motion

You may have seen in a circus a motorcyclist driving in vertic

Physics Part-I

Class 11

NCERT

Chapter 1: Physical World

16 questions

Chapter 2: Units and Measurements

51 questions

Chapter 3: Motion in Straight Line

50 questions

Chapter 4: Motion in a Plane

43 questions

Chapter 5: Laws of motion

52 questions

A disc revolves with a speed of

33 \frac{1}{3}

re v /

, and has a radius of

15 c m

. Two coins are placed at

4 c m

and

14 c m

away from the centre of the record. If the coefficient of friction between the coins and the record is

0.15

, which of the coins will revolve with the record?

You may have seen in a circus a motorcyclist driving in vertical loops inside a death well (a hollow spherical chamber with holes, so the spectators can watch from outside). Explain clearly why the motorcyclist does not drop down when he is at the uppermost point, with no support from below. What is the imum speed required at the uppermost position to perform a vertical loop if the radius of the chamber is

25 m

70 k g

man stands in contact against the inner wall of a hollow cylindrical drum of radius

3 m

rotating about its vertical axis with

200 re v /

. The coefficient of friction between the wall and his clothing is

0.15

. What is the imum rotational speed of the cylinder to enable the man to remain stuck to the wall (without falling) when the floor is suddenly removed?

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Chapter 6: Work, Energy and Power

41 questions

Chapter 7: System of Particles and Rotational Motion

45 questions

Chapter 8: Gravitation

33 questions

Question

Easy

Solving time: 2 mins

You may have seen in a circus a motorcyclist driving in vertical loops inside a death well (a hollow spherical chamber with holes, so the spectators can watch from outside). Explain clearly why the motorcyclist does not drop down when he is at the uppermost point, with no support from below. What is the imum speed required at the uppermost position to perform a vertical loop if the radius of the chamber is $25 m$ ?

Name: Video solution 1: [Solved] You may have seen in a circus a motorcyclist driving in vertical loops inside a death well (a hollow spherical chamber with holes, so the spectators can watch from outside). Explain clearly why the motorcyclist does not drop down when he is at the uppermost point, with no support from below. What is the imum speed required at the uppermost position to perform a vertical loop if the radius of the chamber is 25 m? - Physics Part-I
Uploaded: 2023-09-09T08:32:31.000Z
Duration: 3 min

Views: 5,888 students

Updated on: Sep 9, 2023

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Physics Part-I (NCERT)

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Text solutionVerified

When the motorcyclist is at the highest point of the death - well, the normal reaction R on the motorcyclist by the ceiling of the chamber acts downwards. His weight mg also act downwards.

F_{n e t} = m a_{c} \Rightarrow R + m g = \frac{m v ^{2}}{r}

Here v is the speed of the motorcyclist and m is the mass of does not fall down. The imum speed required to perform a vertical loop is given by equation (1) when

R = 0

.
Therefore,

m g = \frac{m v ^{2}}{r} or v^{2} = g r or v = g r = 9.8 \times 25 m / s = 15.65 m / s

.
So, the imum speed, at the top, required to perform a vertical loop is 15.65 m/s.

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Practice more questions from Physics Part-I (NCERT)

A disc revolves with a speed of

33 \frac{1}{3}

re v /

, and has a radius of

15 c m

. Two coins are placed at

4 c m

and

14 c m

away from the centre of the record. If the coefficient of friction between the coins and the record is

0.15

, which of the coins will revolve with the record?

25 m

70 k g

man stands in contact against the inner wall of a hollow cylindrical drum of radius

3 m

rotating about its vertical axis with

200 re v /

. The coefficient of friction between the wall and his clothing is

0.15

. What is the imum rotational speed of the cylinder to enable the man to remain stuck to the wall (without falling) when the floor is suddenly removed?

View all

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Question Text	You may have seen in a circus a motorcyclist driving in vertical loops inside a death well (a hollow spherical chamber with holes, so the spectators can watch from outside). Explain clearly why the motorcyclist does not drop down when he is at the uppermost point, with no support from below. What is the imum speed required at the uppermost position to perform a vertical loop if the radius of the chamber is $25 m$ ?
Updated On	Sep 9, 2023
Topic	Laws of motion
Subject	Physics
Class	Class 11
Answer Type	Text solution:1 Video solution: 1
Upvotes	148
Avg. Video Duration	3 min

Text solutionVerified

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