Balloons expand when they are heated because A) the molecules ...

[Starlight]

Balloons expand when they are heated because
 
  A) the molecules inside become more massive.
  B) the molecules inside are moving faster.
  C) of the additional molecules in them.
  D) the molecules inside expand when they are heated.
  E) Nonsense--balloons don't expand when they are heated.

Question 2

A projectile is fired at an angle above the horizontal at a location where g = 9.8 m/s2. The initial x and y components of its velocity are 86.6 m/s and 50 m/s respectively. At what angle was the projectile fired above the horizontal?
 
  A) 45
  B) 60
  C) 30
  D) 90
  E) 75

[aburgess]

Answer to Question 1

B

Answer to Question 2

C

[Starlight]

Excellent

[pangili4]

Gracias!