PHYSICS HIGH SCHOOL

Make a island with all renewable energy soursws and how it works and about it but at year 9 level​

Answers

Answer 1
Answer:

Answer:

How are we expected to make an island

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How would an electron shell model of an oxygen atom (O) appear after the atom has formed chemical bonds?

Answers

Since oxygen is found in group 6, it can be said that it will form 2 covalent bonds in order to complete its valency of 8 electrons. When it has formed chemical bonds, its electron shell model will show two atoms attached to oxygen, sharing 2 electrons. If oxygen bonds with only 1 atom (ex. CO), it will show 3 electrons being shared.

Answer:

A

Explanation:

State the law of universal gravitation, and use examples to explain how changes in mass and changes in distance affect gravitational force.

Answers

F(g)= Gm1m2/ r^2 If mass is increased, so will the force of gravity because it is in direct relationship with the gravitational force, but if distance is increased, the force of gravity will decrease because it is indirectly related ( since it is on the bottom of the equation)

What does it mean for an atom to be electronegative? How does this affect the shape and overall charge of a water molecule?

Answers

Answer:

Electro-negativity is the tendency of an atom to attract the shared pair of electron in a covalent bonding while forming a molecule.

Explanation:

In a covalent bonding the atoms share the electrons mutually without actually transferring it to one of the atom to gain a stable configuration. In such a case when one atom is more electro-negative than the other then the shared pair of electron gets slightly shifted towards the more electro-negative developing a denser cloud of electrons near the nucleus of that atom which we denote as partial negative (-\delta) in the superscript.

In water molecules we have a similar case where the oxygen atom is more eletro-negative (value=3.44) than the hydrogen atom (value=2.2). This leads to a higher electron density near the oxygen atom.  A part from the shared pairs, the oxygen atom also possesses 2 lone pairs of electrons which tend tp makethe shape a tetrahedron in a 3D structure. This results in molecular shape being bent with an H-O-H angle of 104.5°.

If the overall magnification of a series of two lenses is 30x, and one lens magnifies 5x, what is the magnification of the other lens? Calculate the total magnification if the 5x lens is replaced by a 7x lens

Answers

Answer:

Explanation:

Given

Overall magnification M=30 x

One lens magnification is 5 x

suppose the magnification of other lens is y

A compound lens is made up of series of lenses either  of same or of different magnification so

y is given by

y=(30 x)/(5 x)=6 x

If 5 x lens is replaced by 7 x lens then total magnification is

7 x* 6 x=42 x

Final answer:

The second lens has a magnification of 6x. If the 5x lens is replaced by a 7x lens, the new total magnification would be 42x.

Explanation:

To find the magnification of the second lens, we need to know that the overall magnification of a system is the product of the individual magnifications of its elements. If the overall magnification is 30x and one lens magnifies 5x, the magnification of the other lens can be calculated by dividing 30x by 5x, giving us a magnification of 6x for the other lens.

If the 5x lens is replaced by a 7x lens, we can calculate the new overall magnification by multiplying the magnification of the two lenses together. So, 6x (from the other unchanged lens) multiplied by 7x gives us an overall magnification of 42x.

Learn more about Lens Magnification here:

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Which phenomenon is a result of the gravitational force of the Sun?O rotation of the planets on their axes
O rotation of the Moon on its axis
O revolution of the Moon around Earth
O revolution of the planets around the Sun

Answers

Answer:

revolution of the planets around the Sun.

Explanation:

The revolution of the planets around the Sun is a result of the gravitational force exerted by the Sun. The Sun's gravitational pull attracts the planets, causing them to move in an elliptical orbit around it. This motion is known as the revolution of the planets around the Sun. The other options listed (rotation of the planets on their axes, rotation of the Moon on its axis, and revolution of the Moon around Earth) are also related to motion and gravity, but they are different phenomena.

A nurse applies a horizontal force of 147 N on a bed that has a mass of 152 kg,The magnitude of the normal force acting on the bed is .967 N
5.00 N
1440 N
1490 N

Answers

A nurse applies a horizontal force of 147 N on a bed that has a mass of 152 kg. The magnitude of the normal force acting on the bed is 1490 N.

What is force?

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

The force applied by the nurse is horizontal, so there's no vertical component.

Therefore, the normal force is simply equal to the weight of the bed.

N = mg

N = (152 kg) (9.8 m/s²)

N = 1490 N

A nurse applies a horizontal force of 147 N on a bed that has a mass of 152 kg. The magnitude of the normal force acting on the bed is 1490 N.

To learn more about force refer to the link:

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Answer:

1490 N

Explanation:

The force applied by the nurse is horizontal, so there's no vertical component.

Therefore, the normal force is simply equal to the weight of the bed.

N = mg

N = (152 kg) (9.8 m/s²)

N = 1490 N
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