A object travels 344 m in 10.0 s at a constant velocity. It then travels 348 m in 185 s at a different constant velocity but continues in the same direction. What is the instantaneous velocity after 5.00 s ?

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answer:   you might love summer weather, but you don’t want it to feel like the sun is inside your car. but a hot car that just won’t seem to cool down might be a bigger of a problem than you think. your car relies on being at the right temperature.

explanation:

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.