Thermodynamics Handout 1 – Chapter 1 - Dr. Ipek
1) A practical example of first law of thermodynamics is:
2) An office worker claims that a cup of cold coffee on his table warmed up to 80°C by picking
up energy from the surrounding air, which is at 25°C. Is there any truth to his claim?
3) Fil in the blanks:
a. The SI unit of force is the _______, abbreviated as _____.
b. The weight of an object is measured in _________.
c. The SI unit of energy is the ___________, which is equal to one N·m
4) Express 1 Newton (N) in terms of the fundamental units of kilograms (kg), meters (m),
and seconds (s). In other words, 1 Newton is equivalent to how many kg·m/s²?
5) A 3-kg plastic tank that has a volume of 0.2 m3 is filled with liquid water. Assuming the
density of water is 1000 kg/m3, determine the weight of the combined system.
6) The gas tank of a car is filled with a nozzle that discharges gasoline at a constant flow rate.
Based on unit considerations of quantities, obtain a relation for the filling time in terms
of the volume V of the tank (in L) and the discharge rate of gasoline ⋁̇ (in L/s).
7) A pool of volume V (in m3) is to be filled with water using a hose of diameter D (in m). If
the average discharge velocity is V (in m/s) and the filling time is t (in s), obtain a relation
for the volume of the pool based on considerations of quantities involved.