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Basic physics questions- any help appreciated

by FestiveF
Tags: appreciated, basic, physics
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Jun30-03, 12:31 PM
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Hi all! I am new to the forum and I have a few lower level physics problem with which I am confused. Any help and explanations will be immensely appreciated!!!

1) A steel pipeline is 1500 m long and is at a temperature of 30 degrees Celcius. How much shorter will it be if the temperature falls to 10 degrees Celcius?
*I got .36 m.....

2) How much heat is absorbed by 255 g of methanol when it is heated from 10 degrees Celcius to 60 degrees Celcius?
*I got 3.12 x 10^4 J....

3) Calculate the number of kJ of heat energy liberated by 4 kg of steam at 100 degrees when it is condensed, cooled, and changed to ice at 0 degrees.
* I got 1.2 x 10^4 kJ....

4) If the density of mercury is 13.59 x 10^3 kg/m^3 at 20 degrees Celcius, what will its density be at 65 degrees Celcius?

5) In a certain hydraulic lift, the small piston has a radius of 15 cm. The large piston has a radius of 26 cm. A force of 225 N is applied to the small piston. What is the mass of the crate that is being lifted by the application of this 225 N force?

Thank you SO much ahead of time ~
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Jun30-03, 12:35 PM
Sci Advisor
PF Gold
enigma's Avatar
P: 1,817
Hi Festive, welcome to the forums!

Can you post your calculations, so we can see where you're getting stuck?
Jun30-03, 07:25 PM
Dave's Avatar
P: 82
Don't you need some thermal expansion coefficents of something?

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