PHYSICS MIDDLE SCHOOL

Stephen and andy are sitting next to each other on a bench. according to the law of universal gravitational there should be a gravitational force between them. why don't they feel this force?A.) Universal Gravitational only applies to objects that are far from earth's surface

B.) The gravitational force is balanced out by the force of friction.

C.) The gravitational force between them is extremely small.

D.) The gravitational attraction is balanced by an equal and opposite gravitational repulsion ​

Answers

Answer 1
Answer:

Answer:

C.) The gravitational force is balanced out by the force of friction.
Answer 2
Answer:

Answer:

C. The gravitational force between them is extremely small.

Explanation:

The force of gravity is based off of the mass and distance of two objects. Stephen and Andy don't have large enough masses to feel an effect.

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What do the atoms of elements in the same group have in common? A. They have the same atomic numbers. B. They have the same average atomic masses. C. They have the same number of electron shells. D. They have the same number of electrons in their outermost shells.

Answers

Answer : The correct option is, (D) They have the same number of electrons in their outermost shells.

Explanation :

Periods : A row in the periodic table is known as periods.

The common features about the elements of a period are :

Each periods has elements with the same number of electron shells or energy levels or shell.

They transition from metal to noble gas that means they move from metal to non-metal and then non-metal to noble gas.

Groups : A column in the periodic table is known as groups.

The common features about the atoms of elements in a same group are :

Each groups has elements with the same number of valance electrons or have same of electrons in their outermost shells.

The elements in the same group have similar chemical properties.

The elements in the same group have similar physical properties.

Hence, the correct option is, (D) They have the same number of electrons in their outermost shells.
I think it's D . They have the same number of electrons in their outermost shells

Explain how inertia and the shape of a loop counteract the force of gravity to keep riders from falling out when a roller coaster goes through a loop traveling upside down

Answers

When a roller coaster car goes through a loop, inertia keeps it from being pulled down by gravity. Inertia is the tendency of an object to resist a change in its motion, meaning that an object (the roller coaster car) which is already moving will resist forces that try to stop it. It will continue to try to move in a constant speed in a constant direction, even if other forces are slowing it down. The shape of the loop in a roller coaster is made so that the car can travel up it without losing its momentum. This is why a roller coaster car needs to be travelling at high speeds to go through a loop. If it weren't travelling quickly enough, the forces of gravity would pull it down before it could make it all the way through the loop.

At sea level, water boils at 100 degrees celcius and methane  boiled at -161 degrees celcius. Which of these substances has a stronger force of attraction between its particles? Explain your answer

Answers

Water has stronger force of attraction between its particles because methane is gas and its particles are further from itself.

I hope I helped

Answer:

87

Explanation:

Explain why the air we breathe and solids, such as steel and bronze, are solutions or homogeneous mixtures, just like salt water is ?

Answers

Answer:

Explanation:

There are two major types of mixtures; homogeneous and heterogeneous mixtures.

Homogeneous mixture is a mixture in which its constituent particles are evenly distributed throughout the mixture. Examples are steel, bronze and air (as stated in the question). While heterogeneous mixture is a mixture in which it's constituent particles are not evenly distributed throughout the mixture. Example includes sand and water solution.

Salt water is an homogeneous mixture because the percentage of salt in a sample of salt from a particular mixture is the same in every other sample (of the same volume) of the same mixture.

From the above, we can deduce that air is an homogeneous mixture because a sample of air (in a particular area) will contain the same constituent by proportion as another sample of air (in the same area). This means that the percentage of oxygen, nitrogen, carbon dioxide, water vapour, argon and other substances in one sample of the air will be equal to the percentage of this constituents in the other sample of the air.

Same can be said about steel and bronze. For steel, each gram of the same steel will contain the same percentage of carbon and iron. And also, each gram of the same bronze will contain the same percentage of copper, tin and other metals present.

For better understanding, let's consider an heterogeneous mixture. A mixture of sand and water solution cannot have the same proportion throughout, this is because sand particles in some samples (of a particular volume) of a particular mixture will be different from sand particles in some other samples (of the same volume) of the same mixture.

Because you can't physically see the difference.

Which of the following will result in the highest conductance ? A. Large cross-sectional area, short pipe
B. Large cross-sectional area, long pipe
C. Small cross-sectional area, short pipe
D. Small cross-sectional area, long pipe

Answers

Answer:small cross-section area,long pipe

Explanation:

Conductance is a measure of how easily the current can flow through a electrical component.

It is the inverse of resistance.

Conductance is given by (cl)/(a)

where c is conductivity(constant for a component),l is the length of component parallel to the flow and a is the area of cross-section of the component perpendicular to the flow.

So,conductivity increases with increase in l and decreases with increase in a.

So,small cross-sectional area and long pipe has high conductance.

James Cameron piloted a submersible craft to the bottom of the Challenger Deep, the deepest point on the ocean's floor, 11,000 m below the surface. What was the total inward force on the 1.1-m-diameter pilot sphere in which Cameron sat?

Answers

Answer:

4.1\cdot 10^8 N

Explanation:

First of all, we need to find the pressure exerted on the sphere, which is given by:

p=p_0 + \rho g h

where

p_0 =1.01\cdot 10^5 Pa is the atmospheric pressure

\rho = 1000 kg/m^3 is the water density

g=9.8 m/s^2 is the gravitational acceleration

h=11,000 m is the depth

Substituting,

p=1.01\cdot 10^5 Pa + (1000 kg/m^3)(9.8 m/s^2)(11,000 m)=1.08\cdot 10^8 Pa

The radius of the sphere is r = d/2= 1.1 m/2= 0.55 m

So the total area of the sphere is

A=4 \pi r^2 = 4 \pi (0.55 m)^2=3.8 m^2

And so, the inward force exerted on it is

F=pA=(1.08\cdot 10^8 Pa)(3.8 m^2)=4.1\cdot 10^8 N

The total inward force is about 4.1 × 10⁸ N

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Further explanation

Let's recall Hydrostatic Pressure formula as follows:

\boxed{ P = \rho g h}

where:

P = hydrosatic pressure ( Pa )

ρ = density of  fluid ( kg/m³ )

g = gravitational acceleration ( m/s² )

h = height of a column of liquid ( m )

Let us now tackle the problem!

\texttt{ }

Given:

depth of the ocean's floor = h = 11 000 m

diameter pilot sphere = d = 1.1 m

atmospheric pressure = Po = 10⁵ Pa

Asked:

total inward force = F = ?

Solution:

F = P A

F = ( P_o + \rho g h ) A

F = ( P_o + \rho g h ) ( \pi d^2 ) → Area of Sphere = π d²

F = ( 10^5 + 1000 * 9.8 * 11000 ) ( \pi * 1.1^2 )

F \approx 4.1 * 10^8 \texttt{ Newton}

\texttt{ }

Conclusion:

The total inward force is about 4.1 × 10⁸ N

\texttt{ }

Learn more

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Answer details

Grade: High School

Subject: Physics

Chapter: Pressure
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