Q: Why are distances in space often measured in light years? A) The light year is a commonly used unit of measurement
B) Distances in space are so great that a large unit is needed
C) Scientists like to use measurements to confuse people
D) Light years are easy to measure and understan

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.