A 3.0-kg mass is attached to a spring with a force constant of 48 ...

[cherise1989]

A 3.0-kg mass is attached to a spring with a force constant of 48 N/m. The motion is subject to a damping force F =-b , where b = 4.0 kg/s.
 
  The mass is subjected to an oscillating force with a driving frequency . At what value of  will the oscillations have their maximum amplitude?
  A)
 
  3.89 rad/s
 
  B)
 
  4.00 rad/s
 
  C)
 
  3.33 rad/s
 
  D)
 
  4.67 rad/s
 
  E)
 
  4.11 rad/s

Question 2

A hollow sphere has a mass of 15 kg, an inner radius of 12 cm and an outer radius of 18 cm. What is the rotational inertia (moment of inertia) of the sphere about an axis passing through its center?
 
  A)
 
  0.15 kgm2
 
  B)
 
  0.24 kgm2
 
  C)
 
  0.13 kgm2
 
  D)
 
  0.17 kgm2
 
  E)
 
  0.19 kgm2

[Kedrick2014]

Answer to Question 1

A

Answer to Question 2

B

[cherise1989]

Excellent

[peter]

Gracias!