Based on the position vs. time graph, which velocity vs. time graph would correspond to the data? Position (m)
Time (s)
Velocity vs Time
25
20
sity (m/s)
15
40
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chemical properties of thing

a coal burning power plant

conservation of mass

mass before something happens = mass afterwards

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.