Hydrogen must be raised to a high temperature before it will ...

[moongchi]

Hydrogen must be raised to a high temperature before it will fuse. This is because
 
  A) fusion and all other forms of chemical combustion must be initiated by high temperatures.
  B) this reaction consumes more thermal energy than it produces.
  C) high temperatures are needed to overcome the strong nuclear force between hydrogen nuclei.
  D) this reaction must consume a large amount of thermal energy in order to produce nuclear energy.
  E) high temperatures are needed to overcome the electric repulsion between hydrogen nuclei.

Question 2

A 1-kg ball is thrown straight up at 10 m/s. Neglecting air resistance, the net force that acts on the ball when it is halfway to the top of its path is
 
  A) 1/2 N.
  B) 1 N.
  C) 5 N.
  D) 7.5 N.
  E) 10 N.

[stillxalice]

Answer to Question 1

E

Answer to Question 2

Answer: E

[moongchi]

Gracias!

[Viet Thy]

Excellent