0
Angular momentum will not change unless an external torque acts upon the system
The short answer would be that angular momentum is conserved, i.e. it cannot be created nor destroyed.
A more technical answer would be that there is a certain theorem in theoretical physics called Noether's theorem which shows that if a physical theory exhibits rotational invariance (i.e. the physics are the same even if you rotate the system) that angular momentum conservation is a result.
According to particle physics therefore the conservation of angular momentum seems to tell us that the Universe is invariant under rotations. This might seem strange, because surely rotating yourself changes how think look, but the physics involved remains the same.
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
How are currrent voltage and resistance related by Ohms Law?
They're not! The relationship you describe is derived from the definition of the ohm, not from Ohm's Law. This tells us that resistance is equal to the voltage divided by the current. Ohm's Law merely tells us that the ratio of voltage to current is constant for variations in voltage -which, unfortunately, is not actually true. In other words, Ohm's Law is not true!
What are advantages of ac bridges?
ac bridges give the value of impedances like inductance, capacitance with high accuracy. it also tells us about the quality factor .
What is the use of transformer utilisation factor?
It tells us how much is the transformer utilised in a given process. For a rectifier,TUF =(D.c.power delivered to the load)/(power rating of transformer secondary)
What is the cycle of a waveform?
goes through your ear and out the other...
What is the function of pneumatics?
A: physics tells us that if a put 1lb of pressure here it will be 1 lb far away. B: The function of pneumatics is to affect mechanical action by means of compressed gasses.
What states that the total momentum of objects that interact do not change?
You have more or less described a law of physics known as conservation of momentum, which is not the same thing as the law of universal gravitation. The law of universal gravitation describes the way mass attracts other mass, and the law of conservation of momentum tells us that momentum is neither created nor destroyed. These two laws are not connected.
What evidence do you have that the moon is moving away from earth?
Laser distance ranging over the past 35 years.
What are the allowed total angular momentum quantum numbers of a composite system in which j1 5 and j2 3?
Using the commutation relation will help us compute the allowed total angular momentum quantum numbers of a composite system.
What principle tells us atoms are not destroyed?
conservation of matter
Why is the law of conservation of momentum important?
The Law of conservation of momentum tells us that the law of conservation of energy is in effect. The first derivative of energy is force. If the force is zero, then there is conservation of energy. If force is zero than momentum is constant as force is dP/dt then 0=dP/dt or Conservation of Momentum.
Why is momentum M times V?
Simply because physicists discovered that it is a product that is conserved. In collisions of two objects for example, if you add up the momentum before the collision the momentum will be the same after the collision. Note that momentum is not something that has a concrete reality. A rock sitting on the ground has zero momentum relative to us here on earth but has alot of momentum relative to someone on mars. It can not have zero momentum and alot of momentum at the same time, it depends on ones frame of reference. My point is that momentum is not at 'concrete" thing. Refer to the 'Conservation of linear momentum' in Wikipedia.org, "The World's Encyclopedia" *Check out related links*
Why does velocity stay constant with decreasing momentum?
As far as we can tell, it doesn't. Momentum is defined as (mass) times (velocity). There appear to be only two ways in which momentum can decrease: either the mass has to magically evaporate, or else the velocity has to decrease. Since mass conservation is a nearly fundamental law of nature, that leaves us with velocity as the only way to change the momentum of a moving body.
What is one way to increase the momentum of an object?
Momentum is of two kind. One is linear momentum and the other is angular momentum. Linear momentum is defined as the product of the mass and the velocity. Hence a vector quantity. To change the momentum of a given body with its mass constant, its velocity is to be changed. Velocity change could be made by changing its magnitude or direction or both. Angular momentum is the product of moment of inertial and the angular velocity. Same manner, angular momentum is also a vector quantity as angular velocity is a vector quantity. Most of us think that moment of inertia of a body about any prescribed axis is also a vector quantity. It is totally wrong as far as my approach is concerned. Moment of inertia is a scalar quantity. So to change the momentum, some force can be applied by allowing a moving body to collide with. Angular momentum can be changed by applying torque on it. Torque colloquially saying is a turning force. Moment of effective force about an axis is termed as torque.
What does the law of conservation of mass tell about the mass of a reactants and products in a reaction before a chemical reaction and the ass of the products of the mass of products after a chemical?
The law of conservation of mass tells us that the mass of the products will equal the mass of the reactants in a chemical reaction.
Why don't we get attracted towards the gravitational force of sun?
The planet Earth, and everything on the Earth including us, is in orbit around the sun; so yes, we are gravitationally attracted toward the sun, but we don't move closer to the sun because that attraction is counter balanced by the angular momentum that keeps us in orbit.
Which of newton's law is related to transfer of momentum when a bat strikes a ball?
Newton's third law of motion is the one related to the transfer of momentum when a bat strikes a ball. His third law of motion tells us that every action has an equal and opposite reaction.Newton's third law, every action has an equal and opposite reaction, is related to the transfer of momentum when a bat strikes a ball.Newton's third law of motion is the one related to the transfer of momentum when a bat strikes a ball.
Does it matter that the moon is moving away from earth?
Not really. At least, it won't make any noticeable difference to us within the next million years or so. The key point is that, since Earth's rotation is slowing down, the Moon HAS TO move away from Earth, to conserve angular momentum.
