Explanation:
The given data is as follows.
Magnetic field strength (B) = 0.65 T
Speed (v) = 2.3 m/s
Induced emf (E) = ?
Formula for emf induced at the ends of the rod of length L which is moving with a speed of v is as follows.
E = BvL
Putting the given values into the formula as follows.
=
= 1.495 L .............. (1)
When magnetic field is changed to = 0.48 T
Now, we assume that the speed be to get the emf .
Then,
= 3.11 m/s
Therefore, we can conclude that the speed v of the rod be adjusted to reestablish the emf induced between the ends of the rod at its initial value is 3.11 m/s.
Answer:
So car will go 50 km in 15 minutes
Explanation:
We have given speed of the car = 200 km/hour
Time t = 15 minutes
We know that 1 hour = 60 minute
So 15 minute =
We have to find the distance
We know that distance = speed ×time = 200×0.25=50 km
So car will go 50 km in 15 minutes
So option (d) will be the correct option
Answer:
Yes, force is also a vector quantity. It has both a direction and a magnitude.
Answer:Work is a measurement of energy.
Power is a measurement of energy per time.
So, power measures how fast work is done.
If we raise 1kg up to a height of 1 meter it takes a certain amount of work. It doesn't matter if it takes us 1 second or 1 hour to raise it. It takes more power, energy per second, to raise it in 1 second than to raise it in one hour.
An engines power rating is in horsepower. A higher horsepower car engine will get a certain car up a hill more quickly than if it had a lower horsepower engine. Even though both engines did the same amount of work in getting the car up the hill