A 1200-kg cannon suddenly fires 100kg cannonball at 35m/sWhat is ...

[big1devin]

A 1200-kg cannon suddenly fires 100kg cannonball at 35m/sWhat is the recoil speed of the cannon? Assume that frictional forces are negligible and the cannon is fired horizontally.
 
  A) 35 m/s B) 3.5 m/s C) 3.2 m/s D) 2.9 m/s

Question 2

Infra-red radiation is produced by
 
  A) mechanical oscillators that move air back and forth.
  B) molecules in thermal motion.
  C) nuclear vibrations.
  D) electric currents oscillating in human-made electronic devices.
  E) electrons orbiting around the nucleus in atoms.

[Ksh22]

Answer to Question 1

D

Answer to Question 2

B

[big1devin]

TY

[Ksh22]

You're welcome