The mass density of platinum is 21.4 103 kg/m3. A platinum wire ...

[luvbio]

The mass density of platinum is 21.4  103 kg/m3. A platinum wire with a radius of 0.500 mm, 1.20 m long, fixed at both ends has a frequency of vibration for its third harmonic equal to 512 Hz. What is the tension in the wire?
 
  A)
 
  4.00 kN
 
  B)
 
  2.00 kN
 
  C)
 
  2.82 kN
 
  D)
 
  1.41 kN
 
  E)
 
  1.00 kN

Question 2

A spherical shell of inner diameter R and outer diameter 3R has a uniform density . What is the magnitude of the gravitational acceleration a distance 4R from the center of the spherical shell?
 
  A)
 
  7GR/6
 
  B)
 
  104GR/3
 
  C)
 
  27GR/12
 
  D)
 
  27GR/3
 
  E)
 
  13GR/6

[vboyd24]

Answer to Question 1

C

Answer to Question 2

E

[luvbio]

Excellent

[kusterl]

TYSM