#1
Jun3003, 12:31 PM

P: n/a

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 ~ 



#2
Jun3003, 12:35 PM

Emeritus
Sci Advisor
PF Gold
P: 1,817

Hi Festive, welcome to the forums!
Can you post your calculations, so we can see where you're getting stuck? 


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