PHYSICS MIDDLE SCHOOL

Simple Machine Lever: A ________ that pivots on top of a fixed point called a _______.

Answers

Answer 1
Answer: A bar that pivots on top of a fixed point is called a lever.

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What is a medium and why do waves travel through them?

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Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.

If the speedometer on a car indicates a constant speed, can you be sure the car is not accelerating? Explain

Answers

no because it might just have a constant speed , even though it's likely improbable
No,because you can go on an open road then climb a hill and for that you should accelerate for maintain a constant speed

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.

C is wrong ( currently failing ) Please Help

Answers

The answer has the be the fourth option "the object is not accelerating." By looking at the graph you would see the the velocity is constant meaning it staying the same and its not increasing or decreasing which takes out the first, second, and third option. So, since how the velocity is not increasing the object is not accelerating or the fourth option.

Hope this helps!

sense the time shown is increasing but the velocity is neither increasing or decreasing then the answer would have to be D.

The source of most of rhe energy we use today isfossil fuels

geothermal

nuclear

biomass

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Your answer should be A. Fossil Fuels. Hope this helps! =^-^= (Brainliest would be appreciated!)

Evaporation: Large amounts of water evaporates from the Earth's ________, _______, __________ every day. The water vapor (evaporation) becomes part of the ________.

Answers

my guesses would be 

surface,oceans,rivers,atmosphere

Possible answers:

oceans/seas/lakes/rivers

atmosphere/sky

Explanation:

Most of the air's moisture evaporates from rivers, lakes, seas, and oceans. Water at the surface of the Earth evaporates into water vapor, which rises into the sky and forms clouds, which eventually release water back onto Earth as precipitation.
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