Two 5 kg balls collide and stick together after the collision. The resultant velocity of the system after collision is 5 m/s. Do we have enough information to determine the energy lost to heat by this system? If not, what is missing?

wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves.

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.