John is nearsighted and cannot see things beyond 90 cm from his ...

[Tirant22]

John is nearsighted and cannot see things beyond 90 cm from his eyes. What is the refractive power of the contact lenses that will enable him to see distant objects clearly?
 
  A) +1.1 diopters
  B) -1.1 diopters
  C) -1.7 diopters
  D) -2.2 diopters
  E) +2.2 diopters

Question 2

What is the net power that a dog with surface area of 0.075 m2 radiates if his emissivity is 0.75, his skin temperature is 315 K, and he is in a room with a temperature of 290 K? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2K4).
 
  A) 9.0 W
  B) 6.0 W
  C) 8.0 W
  D) 15 W
  E) 18 W

[Pariscourtney]

Answer to Question 1

B

Answer to Question 2

A

[Tirant22]

Excellent

[flexer1n1]

Gracias!