First Law of Thermodynamics
The first law of thermodynamics is shared with most of science; it is
one of the fundamental principals that have shaped our understanding
of the working world.
TOTAL ENERGY OF THE SYSTEM AND IT'S SURROUNDINGS IS CONSTANT or ENERGY
IS CONSERVED, Brings back that long established idea that nothing can
be created or destroyed. How do we know this? This is an empirical
law, which means that we know that energy is conserved because of many
repeated experiments by scientists. It's been observed that you can't
get any more energy out of a system than you put into it.
Latent heat
Latent Heat is defined as the heat which flows to or from a material
without a change to temperature. The heat will only change the
structure or phase of the material. E.g. melting or boiling of pure
materials.
One very good illustration of latent heat in action is observed when
we reduce ice to water. If we imagine a bucket of ice on the floor in
an average temperature room (about 30 degrees Celsius) .The ice
doesn't instantly liquidize, nor does the room instantly freeze.
Instead the temperature of the ice rises until it reaches zero degrees
Celsius whereupon it begins to melt. During the entire melting process
the contents of the bucket remain at zero degrees, however the room
temperature would drop indicating that it was putting heat energy into
the melting process. This heat energy is described as latent heat.
Specific heat
The specific heat capacity of a solid or liquid is defined as the heat
required to raise unit mass of substance by one degree of temperature.
Some substances have more resistance to temperature change than others
so more energy is required to alter the temperature. This can be very
useful particularly in cooling systems.
Imagine trying to fry an egg in a frying pan with a steel handle, the
handle would conduct the heat very nicely to your hand. However the
high carbon plastic sheath on most modern pans is very resistant to
water is kept in by a rock ridge on the floor of the corrie called a
The egg breaks when it is dropped. The eggshell is shattered. The yolk is scramble a little bit.
In 1687, Newton published Philosophiae Naturalis Principia Mathematica (also known as Principia). The Principia was the “climax of Newton's professional life” (“Sir Isaac Newton”, 370). This book contains not only information on gravity, but Newton’s Three Laws of Motion. The First Law states that an object in constant motion will remain in motion unless an outside force is applied. The Second Law states that an object accelerates when a force is applied to a mass and greater force is needed to accelerate an object with a larger mass. The Third Law states that for every action there is an opposite and equal reaction. These laws were fundamental in explaining the elliptical orbits of planets, moons, and comets. They were also used to calculate
For most of history, ice and snow, packed into cellars insulated with wood or straw, were used for refrigeration. It wasn’t until 1755 that the first artificial refrigeration system was established by William Cullen (Koelet, 1992). Throughout the 1800s, many mechanical refrigeration systems were designed and developed, and the vapour compression cycle most commonly used today dates back to this time.
Newtons second law can be indentified more easily using the equation F=ma. This is an equation that is very familiar to those of us that wish to do well in any physics class! This equation tells us many things. First it tells us the net force that is being exerted on an object, but it also tells us the acceleration of that object as well as its mass. The force on an object is measured in Newtons (I wonder where they got that from). One Newton is equal to one (kg)(m)/s^2. For example, if superman pushes on a 10,000kg truck and it is moving at a rate of 2m/s^2, then the force that superman is exerting on the truck is 20,000N. For those of us that wish to move on in the field of physics, Newtons second law (F=ma) will forever haunt us!
Some say that the only reason glaciers are melting is because of low evaporation and not hot temperatures. That is one of the reasons , but the other is because there is some mu...
The term snow is usually restricted to material that fall during precipitation in the form of small white ice crystals formed directly from the water vapour of the air at a temperature of less than 0°C and has not changed much since it fell. A fall of snow on a glacier surface is the first step in the formation of glacier ice, a process that is often long and complex (Cuffey and Paterson, 2010). The transformation of snow to ice occurs in the top layers of the glaciers and the time of the transformation depends mostly on the temperature. Snow develops into ice much more rapidly on Temperate glaciers, where periods of melting alternate with periods when wet snow refreezes, than in Polar glaciers, where the temperature remains well below the freezing point throughout the year. The density of new snow as it falls on glacier surface depends mostly on the weather conditions. In clam conditions, the density of new snow is ρs ≈ 50 – 70 kg m-3 (Table 1.1). If it is windy, there is breaking of the corners of snowflakes, and the density is more like ρs ≈ 100 kg m-3. After the snow has fallen on the surface, there are three processes that are all active together and work to transform the snow to ice.
The water moves at a faster rate since there is nothing to absorb the water, which could cause flooding.
the cool water in the stream at the bottom of the lowest holler or any thing in
river may become bridged by this ice mass of up to 70 ft above water
Introduction: A phase change is a result from the kinetic energy (heat) either decreasing or increasing to change the state of matter (i.e. water, liquid, or gas.) Thus saying, freezing is the phase change from a liquid to a solid which results from less kinetic energy/heat. Also, melting is the phase change from a solid to a liquid which results from adding kinetic energy/heat. So, the freezing and melting point of something is the temperature at which these phase changes occur. Therefore, a phase change will occur when a vial of 10 mL of water is placed into a cup of crushed ice mixed with four spoonfuls with 5 mL of sodium chloride for 30 minutes. If 10 mL of water is placed in an ice bath, it will then freeze at 5 degrees Celsius because the kinetic energy will leave quicker with the ice involved. The purpose of this lab is to observe what temperature the water must be to undergo a phase change.
Pressure on the ice reduces the melting point. If pressure is afterward reduced, water will freeze again. This is called regelation. When a player skates across the ice, he or she applies a lot of pressure, leaving a trail of water where the blades were. Because the pressure leaves quickly, the water freezes to ice again (Haché 22). Nevertheless, pressure is not the only factor that causes this melting. Friction also takes part because it creates heat. With help...
The cooktop’s flaws come with its loud beep serving as an alarm. You will also notice that only the middle of the pot would boil or cook effectively. For this reason this cooktop is definitely not suitable for frying as it seems like it is only suitable for small pans. It also gets too hot on lower settings.
Physics is involved in everyday life and can be an essential explanation for how things work. Being a lacrosse goalie involves physics concepts and proves how they apply to every movement that is made on the field. To better understand the physics of a goalie, you must understand how Newton’s Three Laws of Motion work; Inertia, force equals mass times acceleration, and equal and opposite forces, as well as another law torque and leverage.
NEWTON concluded that not only the earth, but every object in this universe attracts every other object present around it with a certain amount of force. To draw this conclusion this great physicist also gave many laws like “THE UNIVERSAL LAW OF GRAVITATION”.