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check 3 quick physic questions

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Identify the areas of physics involved in each of the following tests of a lightweight metal alloy proposed for use in sailboat hulls:
a. testing the effects of a collision on the alloy
Would this be relativity since relativity includes particle collisions?
b. testing the effects of extreme heat and cold on the alloy
My answer is thermodynamics- dealing with temperature.
c. testing whether the alloy can affect a magnetic compass needle
ummmmm....... electromagnetism? because it says "magnetic"?

Testing the "effects" of collision involves strength testing, which involves forces and deformations. Mechanics.

Effects of heat and cold: Mechanics again, with thermodynamics.

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