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Why is it good for a wheel to spin with a large angular momentum?
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According to the law of conservation of in an isolated system the initial total momentum before a collision equals the final total momentum.?
momentum
Can objects with different masses have the same momentum?
Yes. Momentum is rigidly defined as the product of mass and velocity. Velocity describes both a speed and a direction. So let's take two metal balls. One weighs 10 kilograms (kg) and the other weighs 20kg. We roll the 10kg ball along a flat and level floor at 2 meters per second (m/s) and the 20 kg ball at 1 m/s. 10*2 = 20*1 so they have the same momentum. If you have a friend roll the balls for you to catch some distance away, making sure after a few tests to roll the lighter ball at twice the speed of the heavier ball, you will find that it "feels" as if both balls hit your hand with about the same force. Your hand is stopping each ball. That is a force which is defined as the rate of change in momentum. Stopping each ball will cause your muscles to exert about the same strength to stop each ball, even though one is moving at double the speed of the other. You will then feel that two objects can indeed travel at different speeds and yet have the same momentum. JGS
Give an example of the law of conservation of momentum?
Momentum is ALWAYS conserved. To get some interesting examples, think of any situation where the velocity of some object changes - this will change the object's momentum. There will always be some other object whose momentum changes in the opposite direction - the object can be figured out by Newton's Third Law. For example, if a car accelerates or brakes, the interaction is between the car and Planet Earth, so the planet will accelerate in the opposite direction as the car.
What type of lever is a paperclip?
screw and wheel and axle A screw or a twisted inclined plane seems to be the answer you seek.
How do you find the angular velocity of second hand of a watch?
Angular velocity has units of (angle per time), usually stated in radians per second. (1 whole revolution = 2 pi radians) Assuming the watch is operating properly, the second hand turns once per minute. 1 rev/minute = (2 pi) / (60 seconds) = pi/30radians per second. This is usually good enough for most physicists, but if they demand a number, it's easy to work it out: pi = 3.14159 (rounded) Angular velocity = pi/30 = 0.10472 radians per second. Or if you really want the physicist to take notice, tell him "104.72 milliradians per second".
Why planets is an example of rigid bodies?
The outer planets are not a very good example of rigid bodies because of their very thick atmospheres, but it is common to assume they are rigid for calculating the angular momentum.
How a neutron star spins so fast using the law of conservation of angular momentum?
Angular momentum is the energy of spinning objects. We can calculate the energy as the product of the mass times the "moment arm", the distance from the center of rotation tims the speed of rotation. In any closed system, angular momentum is "conserved", or remains constant.On a merry-go-round on the playground, if you get it going and then move toward the center, it speeds up a little. If you move out toward the edge, it slows down.An ice skater spins with her arms extended at a particular speed, but when she pulls in her arms, the rate of spin increases - but the angular momentum remains the same. Her hands and arms, pulled in, have a shorter "moment arm", so to keep the angular momentum constant, the speed increases.A star like our Sun spins in about 25 days. Our Sun is too small to go nova, so let's imagine a star twice as massive. If it were to go nova, about half of the mass would be blown off into space, but the remainder would be crushed into a tiny ball perhaps 20 miles in diameter. But that spinning star, with a rotation speed of perhaps 25 or 30 days, would keep a good part of the angular momentum. The star which once spun at a rate of one rotation per 25 days, with a radius of a half-million miles, now has a radius of 10 miles. So to keep the same angular momentum in such a small package, the neutron star remnant would spin much faster; probably several times per SECOND.
What does a planets rotation cause?
This is a very good question that may not have an ultimate answer, but there is an explanation. The reason a planet rotates is due to its origins from the nebula from which it formed. This nebula had to be rotating. You probably have heard about the gyroscope and how it works- conservation of angular momentum. Angular momentum is determined by the rate of rotation and the mass of the object and its distribution as a function of distance from the axis of rotation. This is the principle behind an ice-skater spinning up when the arms are brought close to the body, or slowing down when the arms are extended. Except for dissipation and action of other torques, angular momentum is held constant. Thus the rotation of the gases and dust from which a planet formed causes the planet to keep on rotating, to conserve the initial angular momentum.The planet's rotation is of course changed by events both inside and outside of the planet. For example, it has been recently shown that the use of dams has changed the distribution of stored water on earth at different latitudes, sufficiently to change the length of the day! The difference is small, but has been detectable.But, why is the angular momentum conserved? And why was the nebula rotating if the universe began in a big bang?
Will law of momentum also hold good if momentum is a scalar quantity?
Momentum is never scalar. Are you sure you phrased that right?
What can you write a good sentence with a word angular?
The man had an angular face.......... read this type of stuff in so many novels.
What cause planets to orbit the sun?
i know only one and it's a good one, the sun's gravity pulls the planets from flying some where else EDIT: Gravity pulls objects together and angular momentum makes sure planets orbit
What two things cause planets to orbit the sun?
i know only one and it's a good one, the sun's gravity pulls the planets from flying some where else EDIT: Gravity pulls objects together and angular momentum makes sure planets orbit
What are the advantages of wheel?
the good things about the wheel consist of transportation, the ability to move large objects, and the invention of the wheel led to the invention of other important inventions such as the gear leading to the invention of automobiles.
Is wheel good invention?
yes, wheel round. wheel good
Has anyone attempted to change the direction of a rocket?
Nasa does it all the time- there are maneuvering jets, steering engines, etc- used for angular corrections ( bear in mind in space there is no atmosphere or wind resistance) Spacecraft- once underway run on momentum a good deal- engines shut down... economical.
According to the law of conservation of in an isolated system the initial total momentum before a collision equals the final total momentum.?
momentum
What is the physics of curling?
The transferrence of momentum from one stone to the other is a good example.
