A wheel of diameter 0.70 m rolls without slipping. A point at the top of the wheel moves with a ...

A wheel of diameter 0.70 m rolls without slipping. A point at the top of the wheel moves with a tangential speed 2.0 m/s.
 
  (a) At what speed is the axis of the wheel moving?
  (b) What is the angular speed of the wheel?

Question 2

The greenhouse effect is the
 
  A) generation of heat in the outer layers of the Earth's atmosphere due to absorption of short wavelength radiation
  B) generation of heat in the ozone layer due to the absorption of ultraviolet radiation
  C) release of heat by volcanism along tectonic plate boundaries
  D) trapping of infrared radiation from the Earth's surface by greenhouse gases like carbon dioxide, methane, and water

Question 3

What is the threshold energy for production of a pair of muons, each of mass 207 mo?
 
  What will be an ideal response?

Question 4

Consider a student whose mass is 70. kg (he weighs 154. lb). If all his mass were converted to energy, this energy could light a 100. watt lamp for how long?
 
  What will be an ideal response?