Three resistors with values R1, R2, and R3, respectively, are ...

[Jipu 123]

Three resistors with values R1, R2, and R3, respectively, are connected in parallel. Which of the following expresses the total resistance, RT, of the three resistors when connected in parallel?
 a. RT = (1/R1 + 1/R2 + 1/R3)
  c. RT = R1 + R2 + R3
  b. RT = R1 = R2 = R3
  d. RT = (1/R1 + 1/R2 + 1/R3)-1

Question 2

An astronomical unit (AU) is the average distance from the Earth to the Sun. An comet in orbit around the Sun has a perihelion (near point to the Sun) of 0.50 AU and an aphelion (far point from the Sun) of 5.0 AU. If the comet's orbital speed at aphelion is v, what is its speed at perihelion?
 a. 11v
  c. 5.5v
  b. 10v
  d. 4.5v

[raenoj]

Answer to Question 1

D

Answer to Question 2

B