A block attached to an ideal spring of spring constant 15 N/m ...

[tfester]

A block attached to an ideal spring of spring constant 15 N/m executes simple harmonic motion on a frictionless horizontal surface.
 
  At time t = 0 s, the block has a displacement of -0.90 m, a velocity of -0.80 m/s, and an acceleration of +2.9 m/s2 . The mass of the block is closest to
  A) 2.3 kg
  B) 2.6 kg
  C) 4.7 kg
  D) 9.4 kg

Question 2

A light beam having a wavelength of 470 nm in air is directed into glycerine at an angle of 75.0 with the normal in air. Glycerine has a refractive index of 1.47. (c = 3.0  108 m/s)
 
  (a) What are the frequency and wavelength of the light in the glycerine?
  (b) What angle does the light beam make with the normal in the glycerine?

[ttt030911]

Answer to Question 1

C

Answer to Question 2

(a) 6.38  1014 Hz, 320 nm (b) 41.1