A nylon thread is subjected to a 8.5-N tension force. Knowing that E 5 3.3 GPa and that the length of the thread increases by 1.1%, determine (a) the diameter of the thread, (b) the stress in the thread.

a)diameter of the thread = 0.546mm

b) stress in the thread = 36.3MPa

Explanation:

Hooke's law

strain = 1.1% = 0.011

Stress = strain* Young’s modulus

= 3.3 × 10⁹ × 0.011

= 36.3 × 10⁶Pa

stress = 36.3MPa

stress in the thread = 36.3MPa

b) Now,

stress = Force / area

Force = 8.5N

Stress = 36.3 × 10⁶

Area = Force / stress

=  8.5 /  36.3 × 10⁶

= 0.234 × 10⁻⁶m²

Area =

diameter of the thread = 0.546mm

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.