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As ice cools from 273 K to 263 K the average kinetic energy of its molecules?
Wiki User
∙ 12y ago
decrease
Wiki User
∙ 12y ago
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Why would your temperature gage read about 100 degrees while running for about 1 hour but when you turn the engine off it will reads about 200 degrees?
While the engine is running, the water is constantly circulating through the block, taking heat out of it, dumping the heat in the radiator with the help of the fan, then going back to the block once it's cool again. That's the way everything is designed to work, in order to carry heat out of the engine block and prevent it from glowing red and melting itself. When you turn the engine off, the water pump stops turning, and the circulation stops. The water that's inside the engine just sits there, and comes up to the temperature of the surrounding block, before the whole thing eventually cools down.
Which type of signal follows a straight line and does not bend with the curve of the Earth?
No electromagnetic signal travels straight through the atmosphere, except during the rare conditions when the atmospheric refractivity is the same at every altitude. Since the refractivity depends on the temperature, humidity, and pressure of the air, you can imagine how rarely that quantity is constant with altitude. When refractivity changes with altitude, the path taken by a beam of radio or light curves as it proceeds along its path. The exact nature of the curve depends on exactly how fast the refractivity changes with altitude at the time. Occasionally but not often, it curves up from a straight path. Most often, it curves down from a straight path, anywhere from slightly to drastically. It doesn't necessarily follow the curve of the earth's surface. Most often, the earth curves down faster than the signal does. It's possible for the signal to curve down exactly as fast as the earth does, and its path remains parallel to the surface. Occasionally, the signal curves down faster than the earth's curvature, and it returns to the ground some distance from the antenna or the flashlight where it started. That situation happens more often in desert regions, where the ground cools rapidly at night. Since the human eye and brain believe that an object is located in the direction from which its image comes, these atmospheric conditions in the desert lead to sightings of oases in the sky and other 'mirages'. It's no accident that the legends of flying horses and magic carpets originated in the harshest deserts. As you may have noticed, this stuff fascinates me. Thanks for the question.
When a substance cools kinetic energy causing the speed of the molecules to?
decreases; increase
Why does the density of liquid increase as it cools?
As something cools down, the kinetic energy of its molecules decrease. This corresponds to a decrease in volume occupied of the substance, so the density decreases.
What happens to a sample of matter when its particles lose kinetic energy?
A loss of kinetic energy in the atoms or molecules of a sample of matter will result in the cooling of the sample. That sample will get colder as remove thermal energy from it. The atoms/molecules of a substance have kinetic energy associated with them. This kinetic energy is the result of atomic and/or molecular motion. As a sample of matter cools, the atoms and/or molecules will lose mobility. Loss of mobility and vibrational energy, which are forms of kinetic energy, will become apparent when thermal energy is removed from the sample.
What cools during evaporation?
Evaporation is a cooling process for a surface because energy is removed from the water as molecules escape the surface. This causes the surface temperature to decrease.When evaporation is taking place we say there is a positive latent heat flux.
What happens to the particles when an object cools?
When an object cools, the particles' kinetic energy transfers back into potential energy, the particles slow down.
The process causes rising air to cool?
Expanding air cools. Work has to be done on the molecules for them to spread apart. A positive amount of work means the kinetic energy in the system decreases. As the air rises, the pressure decreases, causing the molecules to loose energy, which is what we perceive as the cooling of the air.
What happens to the particles in a object as it cools?
The vibrational energy of the atoms and molecules reduces.
What happens to a liquid . When it releases energy?
The liquid cools down. Its molecules move more slowly.
How evaporation causses a Cooling effect?
Energy must be put into whatever is being evaporated (to turn int from liquid to gas). An example is when one sweats, the body cools as the sweat evaporates, because the energy for the sweat (water) to evaporate is taken from the body/skin.
Taking heat out of the air will do what to the air temperature?
Removing heat from the air will lower its temperature.
What happens when molecules lose energy?
They get colder.
When ice on a plate melts why does the plate cool down as well?
When ice is placed on a plate that is warmer than the ice, some of the heat energy from the plate is transferred to the ice. (This is due to the molecules in the plate transferring kinetic energy to those in the ice. The molecules in the plate crash into those in the ice, losing speed and giving the molecules in the ice more speed). Since the heat energy is transferred away from the plate, the plate cools down. (The ice is not cooling down, it is heating up.)
