Author Question: A certain material is in a room at 27C. If the absolute temperature (K) of the material is tripled, ... (Read 21 times)

anshika · **on:** Jul 28, 2018

A certain material is in a room at 27C. If the absolute temperature (K) of the material is tripled, its resistance quadruples. (Water freezes at 273 K.) What is the value for a, the temperature coefficient of resistivity?
a. 0.0050 (C)-1
c. 1 (C)-1
b. 0.0025 (C)-1
d. 3 (C)-1

Question 2

Atmospheric pressure is 1.0 105 N/m2, and the density of air is 1.29 kg/m3 . If the density of air is constant as you get higher and higher, calculate the height of the atmosphere needed to produce this pressure.
a. 7900 m
c. 1260 m
b. 77,000 m
d. 10,300 m