Author Question: If we double only the mass of a vibrating ideal mass-and-spring system, the mechanical energy of the ... (Read 93 times)

shenderson6 · **on:** Jul 29, 2018

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