Author Question: A metal wire has a resistance of 25.00 W under room temperature conditions of 25C. When the wire is ... (Read 225 times)

bb · **on:** Jul 28, 2018

A metal wire has a resistance of 25.00 W under room temperature conditions of 25C. When the wire is heated to 85C the resistance increases by 1.95 W. What is the temperature coefficient of resistivity of this metal?
a. 1.3 10-3 (C)-1
c. 5.0 10-4 (C)-1
b. 1.5 10-3 (C)-1
d. 2.5 10-3 (C)-1

Question 2

If the column of mercury in a barometer stands at 69.4 cm, what is the atmospheric pressure? (The density of mercury is 13.6 103 kg/m3 and g = 9.80 m/s2.)
a. 0.968 105 N/m2
c. 0.925 105 N/m2
b. 1.03 105 N/m2
d. 1.07 105 N/m2