A wheel of moment of inertia of 5.00 kg-m2 starts from rest and accelerates under a constant torque ...

A wheel of moment of inertia of 5.00 kg-m2 starts from rest and accelerates under a constant torque of 3.00 N-m for 8.00 s. What is the wheel's rotational kinetic energy at the end of 8.00 s?
 
  A) 57.6 J
  B) 122.0 J
  C) 91.9 J
  D) 64.0 J
  E) 78.8 J

Question 2

A polarizer (with its preferred direction rotated 30 to the vertical) is placed in a beam of unpolarized light of intensity 1. After passing through the polarizer, the beam's intensity is
 
  A) 0.2501.
  B) 0.7501.
  C) 0.5001.
  D) 0.8661.
  E) 0.5000.

Question 3

In Einstein's General Theory of Relativity, spacetime is
 
  A) one dimensional
  B) two dimensional
  C) four dimensional
  D) three dimensional

Question 4

The energy required to ionize a hydrogen atom from the ground state is
 
  A) 27.2 eV.
  B) 13.6 eV.
  C) 6.8 eV.
  D) 3.4 eV.
  E) infinite.

Question 5

A potter's wheel with a moment of inertia of 8.0 kg-m2 has 5.0 N-m applied to it. It starts from rest. 10. s later it has gained what kinetic energy?
 
  A) 44. J
  B) 0.12 kJ
  C) 78. J
  D) 1.6 kJ
  E) 53. J

Question 6

What is the momentum in kgm/s of a proton when it is moving with a speed of 0.60c?
 
  A) 1.2  10-19 kgm/s
  B) 1.3  10-19 kgm/s
  C) 1.5  10-19 kgm/s
  D) 3.0  10-19 kgm/s
  E) 3.8  10-19 kgm/s