A ramp is inclined at an angle of 31° with the horizontal. You release a thin spherical shell of radius 0.30 m and it rolls without slipping, down the ramp for a distance L. If the mass of the shell is 1.5 kg, and its angular speed when it reaches the end of the ramp is 28.8 rad/s, what is the value of L, in meters?

ABC's

Explanation:

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heat the gas and measure the pressure

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.