Problem 1.4 300 g of aluminum at 90°c is placed in a calorimeter cup containing 400 g of water. the mass of the copper calorimeter cup 80 g. the initial temperature of the water and cup is 22.0°c. what is the final temperature?

The final temperature is  

Explanation:

Specific heat capacity of aluminum ,

Specific heat capacity of water,

Specific heat capacity of copper ,

Let the final temperature be T degree C

Since Heat lost by aluminium = Heat gained by water and calorimeter

Therefore

=>

=>

Thus the final temperature is  

it becomes positively charged by charging it

f=ma newton

f=100x2.5=250n