G By what factor does your kinetic energy increase if you speed up from 10.6 to 23.6 miles per hour? Enter your answer to two significant figures. If you energy doubles, enter 2.0. If it increases by 50%, enter 1.5.

Explanation:

Let the mass is m.

initial velocity, u = 10.6 mph

final velocity, v = 23.6 mph

initial kinetic energy, K = 0.5 mu²

K = 0.5 m x 10.6 x 10.6 = 56.18 m .... (1)

Final kinetic energy, K' = 0.5 mv²

K' = 0.5 x m x 23.6 x 23.6 = 278.48 m    ..... (2)

Percentage increase in kinetic energy is given by

So, it becomes four times.

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.