A boy jumps at a speed of 20.0 m/s at an angle of 25.0 above the horizontal. What is the horizontal ...

A boy jumps at a speed of 20.0 m/s at an angle of 25.0 above the horizontal. What is the horizontal component of the boy's velocity?
 
  A) 18.1 m/s
  B) 15.6 m/s
  C) 8.5 m/s
  D) 12.6 m/s
  E) 20.0 m/s

Question 2

In alpha decay,
 
  A) a proton turns into a neutron
  B) a neutron turns into a proton
  C) a proton turns into an electron
  D) a helium nucleus is ejected

Question 3

How is intelligence defined in the Drake Equation?
 
  A) a civilization that has developed language
  B) a civilization willing and able to communicate over interstellar distances
  C) a civilization that communicates using telepathy
  D) a civilization capable of spaceflight

Question 4

Two coherent sound waves will constructively interfere when the path difference is the wavelength times what?
 
  A) half an integer
  B) an integer
  C) half an odd integer
  D) an even integer plus 1/2

Question 5

Jenny drives at a constant speed of 15 m/s around a circular drive of diameter 60 meters.
 
  (a) Determine her acceleration in m/s2.
  (b) Is her acceleration tangential, centripetal, or centrifugal?
  (c) Is her velocity tangential, centripetal, or centrifugal?