PHYSICS HIGH SCHOOL

Melting, freezing, and boiling are _____________ changes. Question 3 options: A. compound B. molecular
C. isotope
D. physical
E. chemical

Answers

Answer 1
Answer:

To solve the problem we must know about Melting, freezing, and boiling.

What is Melting?

Melting is the process by which a solid is converted to liquid.

What is Freezing?

Freezing is the process by which a liquid is converted to solid.

What is boiling?

Boiling is the vaporization of a liquid when it reaches its boiling temperature.

Now, as we know when there is a change in the phase of a substance, only the physical changes occur in that substance. For example, water when frozen, forms ice although there is a phase change the properties of the water are still the same, still, it will conduct electricity, etc.

Hence, Melting, freezing, and boiling are physical(phase) changes.

Learn more about Melting, freezing, and boiling:

brainly.com/question/2716603
Answer 2
Answer: Melting, freezing, and boiling are PHYSICAL changes. Reason why, you can SEE their PHYSICAL appearance change. Melting, you can see a solid (ice) melt, and turn into a liquid (that's a physical change). Freezing, is when a liquid (possibly water) becomes a solid. It's features change, thus it's a physical change. Boiling, when something is boiled you can see it physically BUBBLE. It heats up, and you can see steam escape from it. This is a physical change, but when you turn it off, the water goes back to normal. But not exactly. When you boil water, you're cleaning and purifying the water. So it become purified drinking water. Also just a tip, when boiling water, make sure the temperature is above 185° F (85° C) so it'll be able to kill all bacteria.
(I wrote this myself, it's my work.) 
Good luck with your studies, hope this helps!! ^-^

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An incandescent light bulb produces light when electrons flow through thea. air.
b. glass.
c. filament.
d. vacuum.

Answers

Electriccurrent passes through a filament of an incandescent bulb, thereby increasingit temperature. When current flows, it contains electrons through the filamentto produce light. The answer is c. Typically, incandescent light bulb consistsof a glass enclosure that contains tungsten filament. The glass enclosure containseither a vacuum or an inert gas that serves as the filament protection fromevaporating. Incandescent light bulbs contain a stem attached at to its base toallow the electrical contacts to run through the envelope without gas or airleaks

Answer:filament

Explanation:

Continental crust is primarily witch kind of rock

Answers

The correct answer is granite oceanic. Continental crust is primarily a granite oceanic. Continental crust is the layers of sedimentary, igneous, and metamorphic rocks that form the area of the shallow seabed that is near the shore. 

When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? A. +2 B. -1 C. -2 D. +1

Answers

C. 2-

electrons have a negative charge, thus adding two electrons to an atom will give it a charge of 2 times -1 or -2

let me correct you , You miss typed "2-" its actually "-2"

Maria is camping when she starts to smell smoke. She turns on her radio and hears that a forest fire is heading her way. How can Maria's organ systems interact to help keep her safe? Include at least five organ systems in your response.

Answers

The hormonal, cardiovascular, central nervous and respiratory systems are all involved in this response.

The body is equipped to respond to emergency situations through the fight and flight hormones secreted by the adrenal gland. This chemical messengers send a message to the brain which now causes reactions such as increased pumping of blood by the heart and a faster breathing rate by the lungs.

Hence, the hormonal, cardiovascular, central nervous and respiratory systems are all involved in this response.

Learn more about hormonal system: brainly.com/question/5333884

A meterstick moves toward you at speed 0.60c. What length do you measure for the meterstick?

Answers


-- IF the meter stick is oriented perpendicular to the direction from
it to you, then it appears 1 meter long to you, but very very skinny. 
The Lorentz contraction only applies in the direction of motion.

-- If the length of the meter stick is pointing toward you, then . . . 

L = L₀ √ (1 - v²/c²)

   =      √ (1 - 0.36)

   =      √ (0.64)  =  0.8 meter .

you measure that it takes 0.75 seconds for a leaf to fall from a tree to the ground. the leaf experiences air resistance as it falls. if there were no air resistance, how long would it take the leaf to fall?

Answers

There's not enough information given in the problem to calculate that answer.

A leaf falling from a tree on Earth, a sheet of printer paper falling off the back
of a truck on Venus, and a steel ball sinking through a bucket of Scotch whiskey
on Mars, might all reach the bottom in 0.75 second.  The time it would take each
of them to fall the same distance through a vacuum in the same place would be
different, and the 0.75 second is not enough to enable you derive it ... even if
you did know the acceleration of gravity in each place.  All you can say is that
without resistance, it would fall faster, and hit bottom in less than 0.75 second.

Answer:

less than 0.75 seconds

Explanation:
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