A 5.00-g lead BB moving at 44.0 m/s penetrates a wood block and ...

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A 5.00-g lead BB moving at 44.0 m/s penetrates a wood block and comes to rest inside the block. If half of its kinetic energy is absorbed by the BB,
 
  what is the change in the temperature of the BB? The specific heat of lead is 128 J/kg  K.
  A) 0.940 K
  B) 1.10 K
  C) 1.26 K
  D) 2.78 K
  E) 3.78 K

Question 2

A photoelectric surface has a work function of 2.10 eV.
 
  Calculate the maximum kinetic energy, in eV, of electrons ejected from this surface by electromagnetic radiation of wavelength 356 nm. (1 eV = 1.60  10-19 J, c = 3.00  108 m/s, h = 6.626  10-34 J  s)

[Tabitha_2016]

Answer to Question 1

E

Answer to Question 2

1.39 eV