The adoption of very similar streamlined body shapes by both sharks and dolphins provides evidence ...

The adoption of very similar streamlined body shapes by both sharks and dolphins provides evidence for
 
  A) cross-breeding
  B) convergent evolution
  C) genetic mutations
  D) life originating in the oceans

Question 2

Daisy (50. kg mass) skates on ice at 4.0 m/s to greet her friend (70. kg mass), who is standing still, with open arms. As they collide, while holding each other, with what speed do they both move off together?
 
  A) 2.5 m/s
  B) 1.7 m/s
  C) zero
  D) 5.0 m/s

Question 3

Heat is added to an ideal gas at 20.C. If the internal energy of the gas increases by a factor of three during this process, what is the final temperature?
 
  What will be an ideal response?

Question 4

The thermal conductivity of concrete is 0.80 W/m-C and the thermal conductivity of wood is 0.10 W/m-C.
 
  How thick would a solid concrete wall have to be in order to have the same rate of flow through it as an 8.0 cm thick wall made of solid wood? (Assume both walls have the same surface area.)

Question 5

A satellite is in a low circular orbit about the Earth (i.e., it just skims the surface of the Earth). How long does it take to make one revolution around the Earth?
 
  What will be an ideal response?