1)Water contracts as it warms up in the range: A)0 F to 10F B)32C to 40C C)0C to

Question

1)Water contracts as it warms up in the range:

A)0 F to 10F

B)32C to 40C

C)0C to 100C

D)0C to 4C

E)-4C to 0C

2)Estimate the rms speed of hydrogen atoms (1.67x10^27 kg each) at 5500 K.

3)Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, how do their average molecular speeds compare? The oxygen molecules are moving

4)The volume coefficient of thermal expansion for gasoline is 9.50x10^-4 per degree C. By how much does the volume of 1 L of gasoline change when the temperature rises from 20 degrees Celsius to 40 degrees Celsius?

Explanation / Answer

by the anamolous expansion of water ,it contracts from 0C to 4C instead of expanding

So the answer is D) 0C to 4C

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2) vrms = sqrt(3kT/m)

m = 1.67*10^-27 kg

k is Boltzmann constant = 1.38*10*10^-23

T = 5500 K

vrms = sqrt(3*1.38*10^-23/(1.67*10^-27)) = 157.44 m/s

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3) vrms = Sqrt(3kT/m)

more is the mass then less is the vrms

v1*sqrt(m1) = v2*sqrt(m2)

m2 = 16m1

v2 = v1/4

so rms speed of oxygen is (1/4) times the speed of Hydrogen

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4)
change in volume dV = gamma*V1*dT = 9.5*10^-4*1*(40-20) = 190*10^-4 =0.0190 L

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