Find the change in internal energy for air between 300 k and 500 k, in kj/kg.

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

Adialysis unit requires 78.5 l of water.the estimated digit is 5. 

Iam pretty sure that the answer is d