A plane is headed eastward at a speed of 156 m/s. A 20.0 m/s wind ...

[tichca]

A plane is headed eastward at a speed of 156 m/s. A 20.0 m/s wind is blowing southward at the same time as the plane is flying. The velocity of the plane relative to the ground is
 
  A) 157 m/s at an angle 7.31 south of east.
  B) 157 m/s at an angle 7.31 east of south.
  C) 155 m/s at an angle 7.36 south of east.
  D) 155 m/s at an angle 7.36 east of south.
  E) 157 m/s at an angle 7.36 south of east.

Question 2

A mixture of helium and another gas diffuses through a porous barrier. The helium diffuses 3.16 times faster than the other type molecule. Identify the other gas.
 
  What will be an ideal response?

[jrpg123456]

Answer to Question 1

A

Answer to Question 2

Argon : 40Ar

[tichca]

TY

[jrpg123456]

You're welcome