<u>Explanation</u>:
Consider the given function
Given that the velocity of rocket is increases at the rate of
The mass of rocket is decreasing at rate of .
Hence
Now find the rate of change of kinetic energy when and
Now consider the given equation,
Now substituting the values and
The rate at which kinetic energy changing is 25MJ
The correct answer is a direct current
Are there choices?? i dont see any
Answer:
Compasses are mainly used in navigation to find direction on the earth. This works because the Earth itself has a magnetic field which is similar to that of a bar magnet. The compass needle aligns with the Earth's magnetic field direction and points north-south. Also, In a magnet all the domains are oriented in the same direction. In the case of a nail, the domains can be aligned in the same direction causing the nail to become magnetic. That is because if you hang a bar magnet from a thread, the north pole will point to magnetic north. When you bring one north pole close to another north pole they repel each other. You can feel the two magnets pushing each other apart.