The resistance of a platinum wire is to be calibrated for ...

[deesands]

The resistance of a platinum wire is to be calibrated for low-temperature work. A platinum wire with resistance 2.000 W at 20C is immersed in liquid nitrogen at 77 K (-196C). If the temperature response of the platinum wire is linear, what is the expected resistance of the platinum wire at -196C? aplatinum = 3.92  10-3 (C)-1.
 a. 0.153 W
  c. 3.69 W
  b. 1.768 W
  d. 0.307 W

Question 2

How deep under the surface of a lake would the pressure be triple that at the surface? (1 atm = 1.01  105 Pa)
 a. 1.00 m
  c. 10.3 m
  b. 9.80 m
  d. 20.6 m

[cpetit11]

Answer to Question 1

D

Answer to Question 2

D