For every ton of coal burned, the approximate amount of CO2 ...

[EY67]

For every ton of coal burned, the approximate amount of CO2 injected into the atmosphere is
 
  A) a few pounds.
  B) a ton.
  C) between 3 and 4 tons.
  D) half a ton.
  E) none, because the CO2 is recovered in solid form.

Question 2

Three identical 50-kg balls are held at the corners of an equilateral triangle, 30 cm on each side.
 
  If one of the balls is released, what is the magnitude of its initial acceleration if the only forces acting on it are the gravitational forces due to the other two masses? (G = 6.67  10-11 N  m2/kg2 )
  A) 4.2  10-8 m/s2
  B) 3.7  10-8 m/s2
  C) 1.9  10-8 m/s2
  D) 6.4  10-8 m/s2
  E) 2.5  10-8 m/s2

[abro1885]

Answer to Question 1

C

Answer to Question 2

D