A supersonic plane passes overhead at a speed of 500 m/s. If you ...

[HudsonKB16]

A supersonic plane passes overhead at a speed of 500 m/s. If you hear the sonic boom (shock wave) 4.00 s after the plane is directly overhead, at what altitude is the altitude the plane flying? Assume the speed of sound in air is 340 m/s.
 
  A)
 
  1.36 km
  B)
 
  2.16 km
  C)
 
  1.85 km
  D)
 
  2.45 km
  E)
 
  The plane is not flying fast enough to produce a shock wave.

Question 2

A series circuit has a resistance of 4.0 , a reactance (due to the capacitance) of 21.0 , and a reactance (due to the inductance) of 17.0 . Find the impedance of the circuit.
 
  A) 42  B) 8.0  C) 27  D) 5.7

[Ashley I]

Answer to Question 1

C

Answer to Question 2

D

[HudsonKB16]

Excellent

[ebonylittles]

TYSM