PHYSICS MIDDLE SCHOOL

a graph is named mpg vs speed of a car traveling on a straight flat road. what does that name tell us about the graph

Answers

Answer 1

Answer:

All of the other choices.

Answer 2

Answer:

It's a graph of a vehicle's fuel efficiency ... what operating speeds make it use more or less gas to go 1 mile.

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A light shines up from the bottom of a fish pond.Which diagram shows the correct path of light as it leaves the water of the pond and hits the air?

Answers

For the question "A light shines up from the bottom of a fish pond. Which diagram shows the correct path of light as it leaves the water of the pond and hits the air?" The second diagram is the correct answer. Water has a higher refractive index than air so the ray of light passing from water to air will be refracted away from the normal (the vertical) towards the surface of the water.

I need help with answering the given question.

Answers

The two hydrogen gas molecules split and the two oxygen gas molecules split and made two water molecules by having two hydrogen gas molecules and one oxygen gas molecule join twice...
Therefore, there would be 3 or 6
if i am not mistaken
hope it helps

A student claims that any object in motion must experience a force that keeps it in motion. Do you agree or disagree? Explain your reasoning.

Answers

Answer: agree

Explanation: because there is always a force that causes motion..

Also I’m back

Where’s the old gang?

Final answer:

Newton's first law of motion states that an object in motion will continue to move at a constant speed in a straight line unless acted upon by an external force. So, not all objects in motion require a force to keep them in motion.

Explanation:

According to Newton's first law of motion, an object in motion will continue to move at a constant speed in a straight line unless acted upon by an external force. So, it is not true that any object in motion must experience a force to keep it in motion. The force is only necessary to change the object's state of motion, such as slowing it down or altering its direction.

For example, imagine a hockey puck sliding on a frictionless ice rink. Once given an initial push, the puck will continue moving at a constant speed in a straight line until it encounters an external force, such as contact with the boards or another player.

Therefore, I disagree with the student's claim. An object in motion does not necessarily need a force to keep it in motion, but rather a force is required to change its state of motion.

Learn more about Newton's First Law of Motion

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The speed of a pendulum is greatest

Answers

The speed of the pendulum is greatest at the midpoint of the pendulum marked 3.

What is a pendulum?

A pendulum is an device that can be used to demonstrate oscillation. We know that in pendulum the potential energy is maximum at the ends of the pendulum.

Thus, the speed of the pendulum is greatest at the midpoint of the pendulum marked 3.

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Answer:

The speed of the pendulum is at maximum at x=0

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.

A student pushes a 40-N block across the floor for a distance of 10 m. How much work was done to move the block? Question 3 options: 4 J 40 J 400 J 4,000 J