PHYSICS MIDDLE SCHOOL

The term test variable refers to:A) control variables

B) dependent variables

C) independent variables

Answers

Answer 1

Answer:

Answer:

answer should be C.) Independent variable since its the one being changed

Explanation:

Answer 2

Answer:

Answer:

The answer should be B.)

Explanation:

I took the test and got this correct

Related Questions

In what direction does an applied force move an object? A.in the same direction as the forceB.independent of the forceC.in the opposite direction of the forceD.perpendicular to the force
Explain why atoms move at different speeds depending on whether they are in liquid or solids
The speed of light if 3 • 10^8 m/s. If the Venus is 30,220,000 mikes from Earth how long does it take for light to travel from Venus to earth?
The space shuttle is located exactly half way between the earth and the moon. Which statement is true regarding the gravitational pull on the shuttle?
Choose three nutritional labels off of food packaging. Explain the ingredients and how to read each label in terms of calories, protein, carbohydrates, fats, and percentage of daily recommended dietary value. Assignment Guidelines: Respond in a short essay format of 200 words of at least three well developed paragraphs. Submission Requirements: Submit your essay. When submitting written assignments, please remember to: submit the assignment question(s) and your responses; proofread for spelling, grammar, and punctuation; use complete sentence structure; and make sure each paragraph has a minimum of six sentences.

On most periodic tables a single atomic mass is listed instead of the mass numbers for all the stable isotopes. How is this mass related to the different isotopes?

Answers

Answer: The mass of the atom is basically the average atomic mass of all the stable isotopes.

Explanation:

Average atomic mass is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_(i=1)^n\text{(Atomic mass of an isotopes)}_i* \text{(Fractional abundance})_i$

For Example: Taking the element silicon

Three isotopes of Silicon, which are Si-28, Si-29 and Si-30.

Average atomic mass of silicon = 28.086 amu

As, the average atomic mass of silicon is closer to the mass of Si-28 isotope. This means that the relative abundance of this isotope is the highest as compared to the other two isotopes.

Percentage abundance of Si-28 isotope = 92.2%

Percentage abundance of Si-29 isotope = 4.7 %

Percentage abundance of Si-30 isotope = 3.1%

Hence, the mass of the atom is basically the average atomic mass of all the stable isotopes.

Since atoms of the same element can vary in number of neutrons, isotopes of elements exist. Since neutrons have mass more or less of them in an atom affects its mass. Mass number is the average mass of the isotopes of an element with respect to the relative abundance of each isotope.

An optical fiber can make a light beam travel in a path that is curved or twisted? True or False

Answers

Answer:

True

Explanation:

An optical fiber is like a glass tube with very small radius. The light travels through these fiber following Total Internal Reflection principle. The movement of the light is not affected by the external factor or the shape of the fiber as long as it is intact. Even if it is twisted or curved, the light will travel as long as the fiber is not damaged physically.

hello their

the correct answer is true

i hope that i have helped

How does Exploring the unseen activity relate to how scientists figure out what an atom looks like?

Answers

I am 11 year old and I just needed to login and I can't answer your question

What unsusual characteristic do the cysts of brine shrimps, the resurrection fern and Tardigrades. What adaptations do they have which enable them to survive when other organisms would die?

Any help would be much appreciated.

Answers

Brine shrimps can reproduce in two ways. 1) viviparious or live reproduction and 2) oviparious or production of eggs that hatch after being expelled from the body. The eggs, coated in chorion coating, are called cysts.

Through the reproduction of cysts, the survival of brine shrimps increase even when dealing in extreme conditions. The cysts can remain in total stasis for two years in oxygen less surroundings, they can survive freezing temperature and boiling tempreture. When conditions improve and eggs are placed in salt water, they hatch within a few hours and increase the population of brine shrimps.

Resurrection ferns are called as such because they resurrect after they shrivel, though the fern does not really die. In extremely hot or conditions, these ferns can lose 75% of their water content, even losing 97% water content if suffering under extreme drought, causing them to shrivel and look like dead ferns. But, when these ferns are again exposed to water, they resurrect and becomes green and healthy. This unusual ability help these ferns to survive under extremely harmful conditions.

Tardigrades are known as nature's toughest animals. They can live in solid ice, intense radiation of space, and boiling water. They can also survive in the desert for ten years without drinking water, as well as, in the deepest part of the sea. Their survival is based on their unusual characteristic to change their form to survive without water.

In the absence of water, tardigrades can completely dry out. The absence of water in their body urges them to replace it with a sugar called trehalose. Trehalose then becomes their source of life until water becomes available to tardigrades for consumption.

Each element is made up of only one kind of_________

Answers

Each element is made up of only one kind of atom.
Each element has their own atom.

each element is made up of one kind of ATOM

Copper has a specific heat of 0.385 j. A piece of copper absorbs 5000 J of energy and undergoes a temperature change from 100 Celsius to 200 degrees Celsius. What is the mass of the piece of copper?

Answers

The mass of the piece of copper will be 130 kg. In the International System of Units (SI), the kilogram is the unit of mass.

What is mass?

Mass is a numerical measure of inertia, which is a basic feature of all matter. It is, in effect, a body of matter's resistance to a change in speed or position caused by the application of a force.

The energy absorbed as;

$\rm \triangle E = mC \triangle t \n\n m = (\triangle E )/(mC) \n\n m = (5000 )/(0.385 (200-100)) \n\n m=130 \ kg$