What does E = mc2 say--that all energy has mass, or that all mass ...

[nelaaney]

What does E = mc2 say--that all energy has mass, or that all mass has energy?
 
  A) All mass has energy. B) It says neither of these.
  C) All energy has mass. D) It says both of these.

Question 2

A 385-g tile hangs from one end of a string that goes over a pulley with a moment of inertia of 0.0125kg.m2 and a radius of 15.0 cm. A mass of 710 g hangs from the other end of the string.
 
  When the tiles are released, the larger one accelerates downward while the lighter one accelerates upward. The pulley has no friction in its axle and turns without the string slipping. What is the tension in the string on the side of the 710-g tile?
  A) 9.77 N B) 5.59 N C) 3.68 N D) 6.87 N E) 4.41 N

[polinasid]

Answer to Question 1

D

Answer to Question 2

B

[nelaaney]

Gracias!

[softEldritch]

Excellent