Thermal Energy, High School Physics?

Question

I have a lot of problems that need answering:

1. Calculate the energy needed to raise the temperature of 185 g of copper from 151 degree C to 201 C. Copper's specific heat is 385J/kg C.


2. 75 g of water at 81 C are mixed with 45g of water at 21 C. CAlculate the equilibium temperature of the mixture. Assume no heat is lost or gained by the surroundings.


3. A 50.0g piece of aluminum is heated in boiling water, then transferred into 150.0g of water at 19.5C. After several minutes, the temperature of the water reaches equilibium at 25 C. Assuming no heat is lost or gained by the surroindings, what is the specific heat of aluminum expressed in J/kg C?

5. Howmany joules of thermal energy must be applied to a 2.00-kg block of ice, initially at 0.0C, to melt it and raise its temperature to 20C? (Hf= 3.34 x 10 to the 5 J/kg; C = 4.18 x 10 to the 3 J/kg K)

Answer 1

Wheres your textbook...ok good now that you have it...open it to the chapter your studying...ok theres the formulas you need to compute these...see that calculator over there yes pick it up and start crunching numbers and if you need a basic math study guide you can find one at either www.nukeworker.com under the DOE study section or on www.westrain.org