Which of the following is true concerning kinetic-molecular theory and heat transfer between relatively hotter Object A and relatively colder Object B?

A. Molecules of Object A collide with those of Object B, and the molecules in Object B move faster.

B. Molecules of Object A collide with those of Object B, and the molecules in Object B move at the same speed.

C. Molecules of Object B collide with those of Object A, and the molecules in Object A move faster.

D. Molecules of Object B collide with those of Object A, and the molecules in ObjectB move slower.

Question

Which of the following is true concerning kinetic-molecular theory and heat transfer between relatively hotter Object A and relatively colder Object B?

A.       Molecules of Object A collide with those of Object B, and the molecules in Object B move faster.

B.       Molecules of Object A collide with those of Object B, and the molecules in Object B move at the same speed.

C.       Molecules of Object B collide with those of Object A, and the molecules in Object A move faster.

D.       Molecules of Object B collide with those of Object A, and the molecules in ObjectB move slower.

michele_laino · Answer

the heat of a body is associated to the motion of its molecules. So, if the object A is colder than object B, then the kinetic energy of each molecule of the object B, is greter than the kinetic energy of each molecule of the object A

michele_laino · Answer

the transfer of heat is caused by collisions among molecules of the object A with molecules of the object B

anonymous · Answer

ohh so but in this case, when object a is hotter than object b, does that mean the opposite? object A has greater kinetic energy than object B?

michele_laino · Answer

so after that collisions, part of kinetic energy of each molecule of the object B, will be transferred to a corresponding molecule of the object A

michele_laino · Answer

yes!

michele_laino · Answer

nevertheless, in this case object A is colder than object B

anonymous · Answer

yay!! but doesn't this problem say "relatively hotter object a and relative colder object b" ? :/

michele_laino · Answer

sorry, I have made an error. I thought that object A is relatively colder than object B

anonymous · Answer

ohh okay no problem!! :D 

so in this case, what would the choice be? :/

michele_laino · Answer

then we can say this:
so after that collisions, part of kinetic energy of each molecule of the object A, will be transferred to a corresponding molecule of the object B

anonymous · Answer

so object a has more kinetic energy than object b, right? 

and ohh okay

so this means Object A is colliding with object b?

michele_laino · Answer

yes! Object A has more kinetic energy ( which is called Internal Energy) than object B

anonymous · Answer

okay, so would that mean the molecules in object b move more quickly? meaning choice A?

michele_laino · Answer

collisions are related to molecules of both objects, namely A and B. The heat transfer, goes from object A to object B

michele_laino · Answer

yes! The right option is the first one!

anonymous · Answer

yay!! thank you!! :D

michele_laino · Answer

thank you!! :D