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Homework Help: Basic lower level physics questions

  1. Jun 30, 2003 #1
    Basic lower level physics questions....

    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. jcsd
  3. Jun 30, 2003 #2

    Tom Mattson

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