During each cycle of its operation, a certain heat engine does 40 ...

[james9437]

During each cycle of its operation, a certain heat engine does 40 joules of work while exhausting 160 joules of thermal energy to the environment. The energy efficiency of this heat engine is
 
  A) 75.
  B) 80.
  C) 25.
  D) 20.
  E) None of the above.

Question 2

A sinusoidal electromagnetic wave is propagating in vacuum. At a given point P and at a particular time, the electric field is in the +x direction and the magnetic field is in the -y direction.
 
  (a) What is the direction of propagation of the wave? (b) If the intensity of the wave at point P is 0.36 W/m2, what is the electric field amplitude at that point? (c = 3.00  108 m/s, 0 = 4  10-7 T  m/A, 0 = 8.85  10-12 C2/N  m2)

[Laurenleakan]

Answer to Question 1

D

Answer to Question 2

(a) -z direction (b) 16 V/m

[james9437]

Wow, this really help

[Sarahjh]

Excellent