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Why does a skater spin faster when she pulls her arms in toward her body?
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When a spinning skater pulls in her arms to turn fasterher angular momentum?
The reason a skater spins faster when she pulls her arms in is because of angular momentum. It is measured by mass x velocity x radius. Bringing her arms in changes her radius and velocity.
What happens to the angular speed of a star as it shrinks?
It must spin faster in order to conserve angular momentum ... the same reason that a skater spins faster when he pulls his arms in close to his body.
Can you spin faster with your arms open?
If you've ever watched an Olympic ice skater do a spin, you may have noticed that he or she will draw in her arms closer to her body in order to increase the speed of rotation. This is in keeping with the law of the conservation of angular momentum.
What muscle pulls arms backward?
The muscles that mainly pull arms backward are the triceps. These are muscles that are found on the back of the upper arm.
Why an ice skater extend her arms when she wants to slow down and crosses her arms when she wants to speed up?
Extending her arms creates greater air resistance, causing a greater amount of force slowing her down. Crossing her arms reduced this air resistance, lessening the force slowing her down.
When a spinning skater pulls in her arms to turn fasterher angular momentum?
The reason a skater spins faster when she pulls her arms in is because of angular momentum. It is measured by mass x velocity x radius. Bringing her arms in changes her radius and velocity.
What happens to the angular speed of a star as it shrinks?
It must spin faster in order to conserve angular momentum ... the same reason that a skater spins faster when he pulls his arms in close to his body.
How does a figure skater spin fast?
pull arms close to your bodykeep a 'secure' position (don't make your body 'loose')skate faster into the spinpractice
If a figure skater is spinning with her arms outstretched why will she spin faster if she brings her arms in?
The answer is related to the conservation of angular momentum. A figure skater will maintain approximately the same angular momentum during their spin (minus a negligible amount due to the friction of their skates and wind resistance). When they move their arms in, they will reduce their rotational inertia by reducing the distance of the mass of her arms and hands from the axis of rotation. In order to maintain the same angular momentum, angular rotation is increased. See the link. Its called the angular conservation of energy. No matter what the skater's position the skater produces a certain amount of energy per second. When his / her hands are extended the distance of the rotation is larger. When he pulls his hands in the weight is unchanged. TO keep the energy at the same amount the difference has to be made up by increasing the number of spins per time unit.
Can you spin faster with your arms open?
If you've ever watched an Olympic ice skater do a spin, you may have noticed that he or she will draw in her arms closer to her body in order to increase the speed of rotation. This is in keeping with the law of the conservation of angular momentum.
How the earth rotates?
The Earth spins on its axis because of conservation of angular momentum. The classic example of this is a figure skater. When a figure skater pulls in her arms, she spins faster. The Earth formed when gas left over from making the Sun condensed into the planets. As this gas cooled and condensed, it started to spin faster. Now that it is spinning (and not condensing any more), it will keep spinning at a steady rate unless something stops.
Why are tornadoes so violent?
Tornadoes develop wind the rotating updraft of a thunderstorm, called a mesocyclone, tightens into a smaller circulation. Just as a spinning ice skater speeds up when she pulls in her arms, so does the vortex of air as it narrows.
How does math play a big role in ice skating?
The biggest role is in the effect of the pressure of the skates on the ice melting it to provide a film of water which lubricates the joint between the ice and the skates and lets them glide over the ice. Then there is the maths regarding the cooling system to ensure the ice stays as ice and doesn't become a big pool of water. Looking at the actual skating, there is the maths behind the movements. How a skater forces themselves forward; how the skater turns corners, how the skater jumps and does spins. For example, in doing a spin, there is conservation of momentum: when the skater spins with their arms outstretched they turn slowly, but when they pull their arms in they spin faster: with their arms outstretched, their moment of inertia is larger than when their arms are pulled in. As [rotational] momentum is speed of rotation times moment of inertia, if the moment of inertia reduces, the speed of rotation must increase to keep the same value (as the momentum is conserved) and hence they spin faster.
Do cuttle fish have eight arms?
they have 8 arms and 2 feeding tentacles that pulls food to the beak.
What muscle that pulls the arms back from across the chest?
Pectoralis Major
What muscle pulls arms backward?
The muscles that mainly pull arms backward are the triceps. These are muscles that are found on the back of the upper arm.
What does an ice skater do to change her rotational speed?
She can move her arms inwards - to increase the rotation speed - or outwards - to decrease it.
