PHYSICS MIDDLE SCHOOL

when an incandescent light bulb is turned on, its thin wire filament heats up quickly. as the temperature of this wire filament increases, its electrical resistance...

Answers

Answer 1
Answer:
Well, we usually assume that the resistance of a circuit component
is constant and doesn't change.  But the truth is that for anything
that conducts current, its resistance always increases somewhat
when it warms up. 

For things like light bulbs, electric toasters, space heaters, electric
stove burners, the heat coils in a blow-dryer ... anything that's
designed to be really hot when it's doing its job ... the resistance
of those things increases significantly when they come up to their
operating temperatures.
Answer 2
Answer:

Hello user!

here is it answer.....

Because the lamp filament is physically very small and dissipates a relatively large amount of power (say, 60W for a typical incandescent bulb), while the conductors which feed it are relatively large and of negligible resistance, so they dissipate very little power, for a relatively large conductor area. How hot a component gets from resistive heating is proportional to its power dissipation, and inversely proportional to its area/size.

Thus if you dissipate, say 60W of power in a tiny lamp filament, it will get hot enough to become (surprise !!) incandescent, while the conductors which supply it (which dissipate perhaps a fraction of a watt for many feet of conductor length) will experience no significant temperature rise.

In fact, applicable electrical codes mandate that circuit conductors be sized large enough and provided with appropriate overcurrent protection, so that no significant conductor heating can take place.

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You are in a desert on a hot day and see water in the distance. It is not really there, you see it because light bends due to a difference in the temperature of air. Which behavior of light best explains this? Select one: a. reflection b. translocation c. diffraction d. refraction
Newton's laws of motion

An element becomes a positively charged ion when itloses protons.

loses electrons.

gains electrons.

gains neutrons.

Answers

An element becomes a positively charged ion when it losses electron.

What is electric charge?

Charged material experiences a force when it is exposed to an electromagnetic field due to the physical property of electric charge. You can have a positive ornegative electric charge (commonly carried by protons and electrons respectively). Unlike charges attract one another while like charges repel one another. Neutral refers to an object that carries no net charge.

Electric charge is a conserved attribute, meaning that the net charge—that is, the sum of the positive and negative charges in an isolated system—cannot change. Subatomic particles carry an electric charge. In the nuclei of atoms, protons have positive charge and electrons carry negative charge in normal matter.

So, an element becomes a positively charged ion when it loses negative charge, that is, electron.

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An element becomes a + ion when it...loses electrons

What are six forms of energy

Answers

1.Sound Energy- is produced when an object is made to vibrate. Sound energy travels out as waves in all directions. Sound needs a medium to travel through, such as air, water, wood, and even metal!
Examples: Voices, whistles, horns and musical instruments.

2.Chemical Energy - is really a form of potential energy and is the energy stored in food, gasoline or chemical combinations.
Examples: Striking a match, combining vinegar and baking soda to form CO2 Gas, breaking light sticks releases chemical energy.

3.Radiant Energy - is a combination of heat and light energy. Light energy, like sound energy, travels out in all directions in waves.
Examples: A light bulb, the glowing coils on a toaster, the sun, and even headlights on cars.

4.Mechanical Energy - is moving energy. It is the form that we most see around us. All moving objects produce mechanical energy. The movements within machines is also mechanical energy.
Examples: People, a rolling bicycle, moving gears, and running cars.

5.Atomic Energy - is produced when you split atoms. A tremendous amount of energy is released when this happens. 
Examples:Atomic bombs, nuclear power plants, nuclear submarines, and the sun.

6.Electrical Energy - Energy produced by electrons moving through a substance is known as electrical energy. We mostly see electric energy in batteries and from the outlets in our homes. Electrical energy lights our homes, run motors, and makers our TVs and radios work.
Examples: CD players, TVs and Video games.

Final answer:

The six forms of energy are chemical, thermal, nuclear, electrical, mechanical, and light energy. Each has different characteristics and uses, such as chemical energy being stored in potential changes or light energy being visible to the human eye.

Explanation:

Energy exists in many forms. Here are six common forms of energy:

  1. Chemical Energy: It is the potential of a chemical substance to undergo a transformation through a chemical reaction to transform into other substances.
  2. Thermal Energy: It is the internal energy present in a system due to its temperature.
  3. Nuclear Energy: The energy in the nucleus of an atom. It can be obtained through two methods, namely fission (splitting of atoms) and fusion (joining of atoms).
  4. Electrical Energy: Form of energy caused by the movement of electrons.
  5. Mechanical Energy: It's a sum of potential and kinetic energy. It is associated with the motion and position of an object.
  6. Light Energy: It is a form of energy that is visible to the human eye.

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Earthquakes are most common:O
A. where oceanic crust slides under continental crust.
O
B. in the middle of continents.
O
c. where two continental plates spread apart.
D. on the edges of the Atlantic plate,

Answers

A is the correct answer

Answer:

A is right

Explanation:

An ___________ is a current-carrying wire wrapped around an iron core.

Answers

That could be an electromagnet,
and it could also be an solenoid.
Your answer is simply, a electromagnet.

Will a cart rolling up and down a ramp have a faster or slower acceleration than a ball being thrown straight up into the air? (Assume up the ramp is positive and the origin is the starting point of the cart)

Answers

a ball being thrown straight up would excel faster.

6. Directions: Drag each item to the correct location on the diagram. Many of the astronomical events that can be witnessed from the Earth's surface can be explained by the Earth's revolution and its rotation.Which of the following phenomena are best explained by the Earth's revolution around the Sun, and which are best explained by the Earth's rotation along its axis?

Which of these go under- Earths Rotation and which go under- Earths Revolution

the Moon's movement
during one night

changing seasons

a sunrise

the Sun's changing
midday height over
several days

passing years

a sunset

Answers

rotation- sunset,sunrise,moons movement

all the others are revolution

leave a thanks if i answered your question 
Earth's daily rotation:
--  the Moon's movement during one night
--  a sunrise
--  a sunset

Earth's yearly revolution:
--  changing seasons
--  the Sun's changing midday height over several days
--  passing years
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