A cylinder of lead has a diameter of 3 centimeters and a height of 8 centimeters. The density of lead is 11.4 g/cm3. What is the mass of the cylinder

m = 644.67

Explanation:

m = v x d

m = pi x r^2 x h x d

m = 56.55 x 11.4

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )

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.