If we double only the mass of a vibrating ideal mass-and-spring ...

[shenderson6]

If we double only the mass of a vibrating ideal mass-and-spring system, the mechanical energy of the system
 
  A) increases by a factor of .
  B) increases by a factor of 2.
  C) increases by a factor of 3.
  D) increases by a factor of 4.
  E) does not change.

Question 2

Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m3 and a speed of 1.20 m/s. The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m3.
 
  What is the speed of the air when it leaves the nozzle?
  A) 123 m/s
  B) 176 m/s
  C) 88.0 m/s
  D) 45.7 m/s
  E) 29.3 m/s

[connor417]

Answer to Question 1

Answer: E

Answer to Question 2

Answer: B

[shenderson6]

Gracias!

[lindahyatt42]

TYSM