An example of a common ferromagnetic material is

a. plastic.
b. hydrogen.
c. nickel.
d. copper.

C

Explanation:

ferromagnetic in formally means that a substance can be magnetized the way iron would be.

Plastic is a no starter. It cannot be magnetized even in your dreams. Not A

Hydrogen is a gas. That does not eliminate it entirely, but it does lesson the chances. Not B

Copper conducts electricity (well). But it cannot be magnetized. Not D

The answer is Nickel. It is nearly as good at being magnetized as iron and in alloys it is better.

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.