Table of Contents
- 1 When a man stands on a turntable stretching with two equal loads in hand and rotates Then he folds his arm Which of the following statement is correct?
- 2 What is the length of the two arms stretched out horizontally?
- 3 What will be effect on speed of a rotating table if a man sitting on it folds his hands inward?
- 4 What happens if a person sits on a rotating chair with his hands stretched then suddenly he brings his hands close to his chest?
- 5 What is the angular speed of the man on the rotating platform?
When a man stands on a turntable stretching with two equal loads in hand and rotates Then he folds his arm Which of the following statement is correct?
Applying principle of conservation of angular momentum, i.e., (b) No, kinetic energy is not conserved in the process. As the moment of inertia is decreasing, the K.E. of rotation increases. This change comes about as work is done by the man in bringing his arms closer to his body.
What happens when a man standing on a turntable raises his hands suddenly explain?
What will happen? When a person on a turntable will raise his hands, there is an increase in the moment of inertia. Hence, the angular velocity of the turntable will decrease.
When a man stands on a turn table stretching with?
He is rotating with a definite angular velocity. Now the man draws his arms closer. His moment of inertia is reduced to 75\% of its initial value.
What is the length of the two arms stretched out horizontally?
An example of a human body ratio is a person’s arm span—the distance from the middle fingertip of the left hand to that of the right hand when stretching out both arms horizontally—to their height. This ratio is approximately a one to one ratio, meaning that a person’s arm span is about equal to their height.
What happens if a person sits on a rotation chair with his hands stretched then suddenly he brings his hands close to his chest?
Angular momentum will increase.
When a boy sit on a rotating chair stretches his hand is angular velocity increases?
We see that the moment of inertia is directly proportional to radius of rotation. Hence, when the boy stretches his hand out, there should be an increase in the moment of inertia and hence, the angular momentum should increase.
What will be effect on speed of a rotating table if a man sitting on it folds his hands inward?
A person sitting on a rotating chair or stool approximates a system in which angular momentum is conserved. If you’re initially rotating with your arms outstretched, then when you draw your arms inward, your moment of inertia decreases. This means that your angular velocity must increase, and you spin faster.
How many arms does the average person have?
Most people have an above-average number of arms. Since some people have no arms or one arm, the average number of arms a person has is somewhere just under two. So if you have two arms, you’ve got more arms than average.
When a gymnast sitting on a rotating platform with his arms stretched suddenly lowers the hand then?
Explanation: A gymnast sitting on a rotating stool with his arms outstretched. Suddenly when he lower his hands his moment of inertia I decreases. Since his angular momentum Iω remains constant and I decreases, his angular velocity ω increases.
What happens if a person sits on a rotating chair with his hands stretched then suddenly he brings his hands close to his chest?
How many human arms are in the world?
Small Arms and Light Weapons The Small Arms Survey estimates that there are more than one billion firearms in the world, the vast majority of which are in civilian hands.
What happens to the moment of inertia when arms are stretched?
If arms are stretched , more mass goes away from axis around which the person is revolving, hence moment of inertia increases. Mathematically, moment of inertia is sum of masses of all elemental individual particles of a body multiplied by square of the distance between axis and the particle.
What is the angular speed of the man on the rotating platform?
A man stands on a rotating platform, with his arms stretched horizontally holding a 5 kg weight in each hand. The angular speed of the platform is 30 revolutions per minute. The man then brings his arms close to his body with the distance of each weight from the axis changing from 90cm to 20cm.
What happens to moment of inertia when angular velocity increases?
Angular velocity will remain constant. Moment of inertia will decrease. Hence, when a person sitting on a rotating stool suddenly lowers his hands, then his angular velocity will increase and moment of inertia will decrease. Was this answer helpful?