Gravitational and inertial masses are equal A. and have been ...

[asmith134]

Gravitational and inertial masses are equal
  A. and have been thought of as such only in the past century.
  B. only when isolated from experimentation.
  C. only when isolated from the ability to tell whether a frame is in a uniform gravitational field or under constant acceleration.
  D. due to the equivalence principle.
  E. only when space is not curved.

Question 2

Hawking radiation
 

a. explains how stars gravitationally collapse to form black holes.
  b. causes the short lives of black holes.
  c. is due to one particle from particle-antiparticle pairs.
  d. explains the accretion disks around black holes.
  e. provides for an event horizon.

[bassamabas]

Answer to Question 1

e.
The equivalence principle states that no experimentation can tell the difference in a confined space of a uniform gravitational fieldwhich uses the gravitational massor a constant accelerationwhich uses the inertial mass.

Answer to Question 2

c.
By applying quantum mechanics to black holes, Hawking was able to predict that random quantum fluctuations would create particle-antiparticle pairs that would annihilate almost immediately. Unless, of course, one half of that pair crossed the event horizon of a black hole and the other went the other direction. In this way, the black hole would slowly lose energy because of the radiation it emits.