Measurement of absolute zero: Suppose the pressure of the bulb is 20 psi (absolu
ID: 1411868 • Letter: M
Question
Measurement of absolute zero: Suppose the pressure of the bulb is 20 psi (absolute) at 20 C. What would you predict the pressure to be at 0 C? What would you predict the pressure to be at 100 C? The Mechanical equivalent of heat: Using the table provided, what is the change in the thermistor resistance if its temperature rises from 21 C to 30 C? Using formula (34), what is the temperature in C if the thermistor resistance is 125.74 Kohm? Does it matter how many turns of cord surround the cylinder? Why? Does it matter how fast you turn the crank? Why? Suppose the cord, where it is attached to the post, is under tension during the experiment. Would this lead to an error in your measured value of the mechanical equivalent of heat? If so, would your value be too large, or too small?Explanation / Answer
1. (a) Bulb having costant volume,
P/T = costant
P1/P2 = T1/T2
P2 = P1*T2/T1
= 20*(273/(273+20))
=18.63 psi
(b)
Bulb having costant volume,
P/T = costant
P1/P2 = T1/T2
P2 = P1*T2/T1
= 20*((273+100)/(273+20))
=25.46 psi