A resistor is connected to an ideal ac power supply. (a) The ...

[Ebrown]

A resistor is connected to an ideal ac power supply.
 
  (a) The phase angle between the current and voltage is
   A) 0
   B) /2 radians.
   C) -/2 radians.
   D)  radians.
   E) 3/4 radians.
  (b) The current in the resistor
   A) leads the voltage across the resistor by 90.
   B) lags the voltage across the resistor by 90.
   C) is in phase with the voltage across the resistor.
   D) the voltage across the resistor by 45.
   E) lags the voltage across the resistor by 45.
  (c) How does the average power dissipated in the resistor change as the frequency in the ac power supply decreases?
   A) It decreases.
   B) It increases.
   C) It does not change.
   D) It increases or decreases depending on the sign of the phase angle.

Question 2

Two satellites with equal rest masses of 100 kg are traveling toward each other in deep space. One is traveling at 0.650c and the other at 0.850c. The satellites collide and somehow manage to stick together.
 
  What is the rest mass of the combined object after the collision?
  A) 378 kg B) 277 kg C) 200 kg D) 312 kg E) 100 kg

[tdewitt]

Answer to Question 1

(a) A (b) C (c) C

Answer to Question 2

D