Chapter 7
SYSTEM OF PARTICLE AND RELATIONAL MOTION
1. A stone of mass m tied to a string of length l is rotating along a circular path with constant speed v the torque on the stone is
Ans:- constant angular speed, torque is zero
2. The separation between carbon and oxygen atoms in co molicule is 0.12 nm .
What is the distance of centre of mass from carbon atom ?
Ans:- 0.07 nm
3.A particle covers equal distances around a circular part in equal interval of time . Which of the following quantity connected with a motion of particle remains constant with time?
Ans:- speed
4. A car is going round a circle of radius R1 with constant speed .Another car is going round a circle of radius R2 with constant speed if both of them take same ti
me to complete the circle .the ratio of the angular speed will be
Ans:- They take same time complete 1 circle so the angular velocity is same for both and ratio is 1
5. "The momentum of inertia of the body does not depend up on the angular speed "
State whether this statement true or False
Ans:- True
6. It is easier for swimming jumping into water hight to describe loop in the air by a
Ans:- pulling arms and legs closer decreases moment of inertia. Angular speed increases to conserve angular momentum
7. A particle move along a circular path of radius r with uniform speed V The angle describe the particle in one second is
Ans:- angle described in 1 sec = angular speed
8. A flywheel rotates at a constant speed of 3000 rpm .The angle described by the shaft in radian in one second is
Ans:- 100 pai
9. A ring rolls along a plane surface then the ratio between liner kinetic energy of the ring is
Ans:- 1:1
10. Which of the following will be conserved
Angular momentum, angular speed momentum of inertia
Ans:- angular momentum
11 . What will be duration of a day
Ans:- L= loo is constant .when R become half. l become one fourth .
12. Define momentum of inertia
Ans:- it is the rotational analog of mass
13. What is the unit of momentum of inertia
Ans:- kg m2
14. Name the body whose momentum of inertia remains the same about all the axes passing through is center of mass
Ans:- solid sphere
15. Name the two types of motion associated with the cylinder
Ans:- Transilational motion and rotational motion
SYSTEM OF PARTICLE AND RELATIONAL MOTION
1. A stone of mass m tied to a string of length l is rotating along a circular path with constant speed v the torque on the stone is
Ans:- constant angular speed, torque is zero
2. The separation between carbon and oxygen atoms in co molicule is 0.12 nm .
What is the distance of centre of mass from carbon atom ?
Ans:- 0.07 nm
3.A particle covers equal distances around a circular part in equal interval of time . Which of the following quantity connected with a motion of particle remains constant with time?
Ans:- speed
4. A car is going round a circle of radius R1 with constant speed .Another car is going round a circle of radius R2 with constant speed if both of them take same ti
me to complete the circle .the ratio of the angular speed will be
Ans:- They take same time complete 1 circle so the angular velocity is same for both and ratio is 1
5. "The momentum of inertia of the body does not depend up on the angular speed "
State whether this statement true or False
Ans:- True
6. It is easier for swimming jumping into water hight to describe loop in the air by a
Ans:- pulling arms and legs closer decreases moment of inertia. Angular speed increases to conserve angular momentum
7. A particle move along a circular path of radius r with uniform speed V The angle describe the particle in one second is
Ans:- angle described in 1 sec = angular speed
8. A flywheel rotates at a constant speed of 3000 rpm .The angle described by the shaft in radian in one second is
Ans:- 100 pai
9. A ring rolls along a plane surface then the ratio between liner kinetic energy of the ring is
Ans:- 1:1
10. Which of the following will be conserved
Angular momentum, angular speed momentum of inertia
Ans:- angular momentum
11 . What will be duration of a day
Ans:- L= loo is constant .when R become half. l become one fourth .
12. Define momentum of inertia
Ans:- it is the rotational analog of mass
13. What is the unit of momentum of inertia
Ans:- kg m2
14. Name the body whose momentum of inertia remains the same about all the axes passing through is center of mass
Ans:- solid sphere
15. Name the two types of motion associated with the cylinder
Ans:- Transilational motion and rotational motion
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