"One of the earliest methods of central heating involved the use of a boiler. In boiler systems, water is heated using a fossil fuel such as coal, oil, or propane. The water is allowed to convert to steam. It then travels through piping to the various rooms in the house. Each room has at least one radiator. As the name implies, heat energy radiates from this unit. When the heat energy (in the form of infrared waves) encounters solid objects in the room, those objects absorb the energy and warm up. Only a small amount of convection is involved in distributing heat from radiators."
"Radiant heat can also be obtained from electricity-based units. In these appliances, as electricity runs through wires, heat is generated. The wires may glow red. Again, this type of heat is radiated through the air and absorbed by solid objects. Many space heaters are radiant in design."
-Alpha Omega Academy, Unit 2 (Heat Flow), Assignment 5 (Heating Systems)
"Radiant heat passes through the air and heats solid objects making it highly efficient wherever it's installed. Because radiant heat is produced instantly, there is no need for expensive pre-heating. Infrared heaters provide heat and warmth quickly so you are able to save on the costs of heating seldom used areas."
-Article : How do radiant heaters work? - AEI Corporation
SO...
The answer is:
A) To nearby solid objects
Hope this helps! :)
By the way, I got this correct on my assignment!
Answer:
To nearby solids
Explanation:
B.A child swinging on a park swing
C.A golf ball after it has been hit off the tee
D.A skier curving back and forth across a wide slope
B. Glaciers
C. Moving water
D. Human actions
Which is not a cause of weathering?
A. well I wouldn't say wind because wind is a part of what happens with tornadoes
B. It would be glaciers because they stand alone unless wind or something takes responsible action for it to happen. So it takes either some other thing for it to happen like water and a really cold temperature.
C. Moving water is like rain so it would be a type of climate so it would not be the answer to what is not a main cause of weathering.
D. human actions is a cause for weathering because you can put a box of melted ice cream in a freezer and it will be frozen again.
To make this less confusing I would say it is B. Glaciers because glaciers cannot cause weather to happen.
~QueenBeauty666~
B. Glaciers
a would not do because wind does a lot of weather damage
c would not do because moving waters cause hurricanes
d would not do because humans cause acidic rain
Answer:
10g
Explanation:
The experiment is about melting of tin. When solid tin is melted, it retains the amount of substance it originally has and we expect it to still be 10g.
Mass is the quantity or amount of matter contained in a substance. For most chemical processes, the law of conservation of matter is always succinctly observed.
The law states that "matter is neither created nor destroyed in a chemical reaction or process". Although melting is a phase change, we can adapt this law to the process. Owning to no loss of matter in the melting procedure, the amount of substance remains the same.
Therefore, we are left with about the same mass of substance we started with which is 10g.
Answer:
10g
Explanation:
As the Law of Conservation of Mass states that " Mass can neither be created nor be destroyed in a chemical reaction".
Though melting of tin isn't a chemical change, the same logic is applied here...
Hence,
The mass of tin will be 10 g itself...
B. be given a positive charge produced by the movement of electrons to the other end of the ball.
C. be given a negative charge produced by the movement of electrons from the rod.
D. be given a negative charge produced by the movement of electrons from the other end of the ball.
As per the question the uncharged pith ball is taken towards the electrostatic field of a charged rod.
It is told that the side of the pith ball is closest to the negatively charged end of the rod .
The pith ball was initially neutral.The electrons in the atom were oriented in their respective orbits.
Whenever it is taken towards the negative end of the rod,the electrons present in the ball will not stick to their orbit .Basically the closest electrons will suffer electrostatic repulsive force and will come out their orbits.They will move towards the other end of the pith ball.Hence the closest side of the pith ball will acquire positive charges and other side will be negative.
The bound charges nearest to the charged rod is called induced positive charges and bound negative charges present at the other end are called free bound charges.The induced charges and free charges are equal in amount.Hence the pith ball is neutral.
Hence from above we see that only option B is right.
The correct answere is B.
Explanation: When the negative charge rod is brought close to the uncharged pith ball, the electron on side towards the rod will be repelled by the electrostatic field. This will create an electron deficient site. Hence, this side will be given a positive charge.
b. A girder is lowered by a crane. It is slowing down.
c. You're straining to hold a 200 lb barbell over your head.
d. A jet plane has reached its cruising speed and altitude.
e. A rock is falling into the Grand Canyon.
f. A box in the back of a truck doesn't slide as the truck stops.
Answer:
a) dynamic equilibrium; b) No equilibrium; c) Static equilibrium; d) Dynamic equilibrium; e) Not equilibrium; f) Dynamic equilibrium.
Explanation:
a) In this case, the girder is in dynamic equilibrium, although there is movement it is realized at constant speed therefore there is no acceleration and the sum of forces is equal to zero.
b) There is no equilibrium since the velocity is decreasing it slows the girder, therefore the sum of forces will be equal to the product of mass by acceleration according to newton's second law.
c) In this case, the arms of the person are exercising each 100 lb, in order to keep the barbell stable, this allows the static equilibrium.
d) There is movement but however the jet will move at constant speed without any kind of acceleration, therefore it has a condition of dynamic equilibrium.
e) There is no balance as the rock falls and the acceleration due to gravity causes its speed to increase as it goes down.
f) In this case there is dynamic equilibrium as there was a deceleration movement however this force value given by the deceleration multiplied by the mass is not large enough to be able to move the box, due to the weight of the box plus the friction force between the box and the surface.
b. month . . . day
c. year . . . month
d. year . . . day
The Earth rotates on its axis every __day________ and revolves around the Sun every _____year_____.
Rotation refer to an object's spinning motion about its own axis
Revolution refers to the object's orbital motion around another object
The earth rotates on its axis 23 hours, 56 minutes and 4 seconds which is approximately equal to one day whereas the earth revolve around sun in 365 days , 6hours , 9minutes which is nearly equal to an year.
Hence , correct option is a) day . . . year
learn more about rotation and revolution of earth:
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