Answer
Correct Answer is D ( so that there will be a change in the magnetic field required for induction)
Explanation:
Transformer is a device in which electrical energy is transferred between two or more circuits.
Transformer working is based on Faraday’s law of electromagnetic induction. Transformation action in a transformer occur due to mutual induction between two or more winding.
A transformer consists of one or more winding which are coupled magnetically and separated electrically with a magnetic core. A changing or varying current in one coil of the transformer produces a changing magnetic flux due to which an emf (electromotive force ) is induced across the second coil which is wound around the same core.
Therefore a transformer needs an AC due to which a changing magnetic field will be created and due to this changing magnetic field an emf will induced in the second coil.
If DC is used in transformer then magnetic induction will not takes place since DC current will remain constant
Kind of. A barometer measures air pressure. Not actual weather. Even though air pressure has a lot to do with the weather it is not exactly the same thing.
Answer:
Explanation:
Given:
- mass of skier,
- initial velocity of skier,
- height of the hill,
- spring constant,
<u>final velocity of skier before coming in contact of spring:</u>
Using eq. of motion:
<u>Now the time taken by the skier to reach down:</u>
<u>Now we calculate force using Newton's second law:</u>
<u>∴Compression in spring before the skier momentarily comes to rest:</u>
Answer:
2000 kg m/s
Explanation:
The momentum of an object is a vector quantity whose magnitude is given by
where
m is the mass of the object
v is the velocity of the object
and its direction is the same as the velocity.
In this problem, we have:
- Spaceship 1 has
m = 200 kg (mass)
v = 0 m/s (zero velocity)
So its momentum is
- Spaceship 2 has
m = 200 kg (mass)
v = 10 m/s (velocity)
So its momentum is
Therefore, the combined momentum of the two spaceships is
