According to Einstein's mass-energy relation, A) a heated ...

[Davideckstein7]

According to Einstein's mass-energy relation,
 
  A) a heated object has slightly greater mass than the same object when it was cooler.
  B) a stretched rubber band has slightly greater mass than the same rubber band when unstretched.
  C) Both of the above.
  D) None of the above.

Question 2

A 3.0-kg and a 5.0-kg box rest side-by-side on a perfectly smooth, level floor. A horizontal force of 32 N is exerted on the 3.0-kg box pushing it against the 5.0-kg box, and, as a result, both boxes slide along the floor.
 
  How hard do the two boxes push against each other? A) 12 N
  B) 20 N
  C) 24 N
  D) 32 N
  E) 0 N

[batool]

Answer to Question 1

C

Answer to Question 2

B

[Davideckstein7]

Excellent

[Dominic]

Gracias!