Nhận biết (M1)

While researching a topic, a student has taken the following notes:

• • Generally, an object will heat up when twisted.

• • The twisting of an object is known as torsion.

• • A 2019 study led by Zunfeng Liu and Ray Baughman tested the torsional heating of various fibers.

• • When a 0.7-millimeter-thick sample of single-ply nickel-titanium (NiTi) wire was twisted, its average surface temperature increased by 21.3∘C.

• • When a 2-millimeter-thick sample of ethylene propylene diene monomer (EPDM) rubber fiber was twisted, its average surface temperature increased by 12∘C.

The student wants to contrast the two samples. Which choice most effectively uses relevant information from the notes to accomplish this goal?

• A.

  In 2019, researchers studied the effect of torsional heating on various fibers, including samples of EPDM rubber and single-ply NiTi wire.

• B.

  The EPDM rubber sample used in the 2019 study was thicker than the single-ply NiTi wire sample.

• C.

  Twisting an object will generally cause its temperature to increase, a process known as torsional heating.

• D.

  When the fibers were twisted as part of the 2019 study, the surface temperature of both samples increased.