A 51.8-kg bungee jumper jumps off a bridge and undergoes simple ...

[james]

A 51.8-kg bungee jumper jumps off a bridge and undergoes simple harmonic motion. If the period of oscillation is 11.2 s, what is the spring constant (force constant) of the bungee cord?
 
  A) 16.3 N/m
  B) 19.6 N/m
  C) 26.1 N/m

Question 2

A laser emits a pulse of light that lasts 10 ns. The light has a wavelength of 690 nm, and each pulse has an energy of 480 mJ. How many photons are emitted in each pulse?
 
  (c = 3.0  108 m/s, h = 6.626  10-34 J  s)
  A) 1.7  1018
  B) 2.1  
  C) 2.6  
  D) 3.1

[InfiniteSteez]

Answer to Question 1

A

Answer to Question 2

A