Rotational dynamics class 12 physics chapter 1 Exercise solutions

Rotational dynamics class 12 physics chapter 1 Exercise solutions

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questions are as follows. .

Class 12
Physics
1. Rotational dynamics
Exercise solutions
By: solutions made easy

(Use g = 10 m/s², unless, otherwise stated.)
1. Choose the correct option.
i) When seen from below, the blades of a ceiling fan are seen to be revolving anticlockwise and their speed is decreasing. Select correct statement about the directions of its angular velocity and angular acceleration.
(A) Angular velocity upwards, angular acceleration downwards.
(B) Angular velocity downwards, angular acceleration upwards.
(C) Both, angular velocity and angular acceleration, upwards.
(D) Both, angular velocity and angular acceleration, downwards.
Answer: (A) Angular velocity upwards, angular acceleration downwards.

ii) A particle of mass 1 kg, tied to a 1.2 m long string is whirled to perform vertical circular motion, under gravity. Minimum speed of a particle is 5 m/s. Consider following statements.
P) Maximum speed must be 5 5 m/s.
Q) Difference between maximum and minimum tensions along the string is 60 N.
(A) Only the statement P is correct.
(B) Only the statement Q is correct.
(C) Both the statements are correct.
(D) Both the statements are incorrect.
Answer: (C) Both the statements are correct.

iii) Select correct statement about the formula (expression) of moment of inertia (M.I.) in terms of mass M of the object and some of its distance parameter/s, such as R, L, etc.
(A) Different objects must have different expressions for their M.I.
(B) When rotating about their central axis, a hollow right circular cone and a disc have the same expression for the M.I.
(C) Expression for the M.I. for a parallelepiped rotating about the transverse axis passing through its centre includes its depth.
(D) Expression for M.I. of a rod and that of a plane sheet is the same about a transverse axis.
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[ifunfactory]

1 solution wrong answer should be B as its acceleration decreasing angular acceleration will act opposite means upwards

[rnijfbv]

bhi apane choose the correct option me A and B ans galat ☠diya hai our mera 11th main bhi ese hi hua tha to please follow another teacher

[varshasurwade]

Is it suitable for Board exams ?
Please reply

[sanipatil]

Question no. 3 answer is half, they have asked for 4 wheeler also that why they don't need leaning

[Nandini_singh]

Please provide pdf also as it is so difficult to take again and again screenshot shots

[jhwzvrv]

Sir question no. 20 ka ans Galt hai ans 24000

[amanshinde_a_]

Why don't you explain in this video????

[rnijfbv]

thanks bolana chodoo sahi, galat dekho😐😑🙅‍♂

[Xtremeriderofficialchannel]

Sir mujhe apke pass nhi ana tha galti se aya hu pdf cant send

[manojphalke]

Can you give this in the form of pdf in description

[Edit_records]

This answer suitable for exams
Please reply

[gauravkamble]

Sir 12th board paper mai answer chale ga

[swayamkerekar]

can u provide with a pdf or drive of these solutions pls

[cwrmtsj]

Sir please tell me 8 jesa dikhne wala g hai kya kuch aur