## Carnot heat engine and carnot cycle

To find out how to increase the efficiency of the heat engine, a French scientist named Sadi Carnot (1796-1832) examined an ideal theoretical caloric machine in 1824. At that time, the first law of thermodynamics had not been formulated,...

## Second law of thermodynamics

To explain the irreversible thermodynamic processes, the scientists formulated the second law of thermodynamics. The second law of thermodynamics explains what processes can occur in the universe and what processes cannot happen. One scientist named R. J. E. Clausius...

## Thermodynamic processes : isothermal, adiabatic, isochoric, isobaric

There are four thermodynamic processes, namely Isothermal, isochoric, isobaric and adiabatic processes. Isothermal Process (constant temperature) In an isothermal process, system temperature is kept constant. Theoretically, the analyzed system is an ideal gas. Ideal gas temperature is directly proportional...

## First law of thermodynamics

Thermodynamic process Heat (Q) is the energy that moves from one object to another because of the temperature difference. About systems and environments, heat is energy moving from system to environment or energy moving from environment to system, due...

## Transverse waves – problems and solutions

1. The distance between the two troughs of the water surface waves is 20 m. An object floats on the surface of the water so that it experiences the vibration motion. If the time to travel one vibration is...

## Speed of the mechanical waves – problems and solutions

1. The speed of the transverse wave on a 25 meters rope is 50 m/s. The tension force of the rope is 200 N. Determine the mass of rope. A. 0.08 kg B. 0.5 kg C. 0.8 kg D....

## Simple harmonic motion – problems and solutions

1. An object vibrates with a frequency of 5 Hz to rightward and leftward. The object moves from equilibrium point to the maximum displacement at rightward. Determine the time interval required to reach to the maximum displacement at rightward...

## Simple pendulum – problems and solutions

1. Two simple pendulums are in two different places. The length of the second pendulum is 0.4 times the length of the first pendulum, and the acceleration of gravity experienced by the second pendulum is 0.9 times the acceleration...

## Resonance of sound wave – problems and solutions

1. After the tuning fork A is vibrated, the tuning fork B is vibrated. The tuning fork B is vibrated because….. A. The tuning fork A has the same amplitude as the tuning fork B B. Both tuning forks...

## Pressure of fluids – problems and solutions

1. Acceleration due to gravity is 10 N/kg. The surface area of fish pressed by the water above it is 6 cm2. Determine the force of water above fish that acts on fish. Known : Acceleration due to gravity...