PHYSICS MIDDLE SCHOOL

What is the force that holds electrons in their atomic orbitals (often depicted as orbits, similar to planets around the sun) A. Electric force
B. Gravitational force
C. Magnetic force
D. An unknown force
E. An orbit force free

Answers

Answer 1
Answer: The correct answer is C

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What do you know about stars?
The rotation of Earth on its axis causes _______ and _______. The revolution of the Earth around the sun causes the ______.
A student is pushing a box across the room. To push the box three times farther, the student needs to do how much work?

A particle is moving in a circular path of radius r . The displacement after half a circle would be

Answers

Answer:

2r

Explanation:

As we know that

The displacement is the total distance measured between the initial or start and final or destination point

If particle cover half path of the circle, the displacement can easily find out by considering the distance between the start and destination point

We attached the diagram for better understanding

As per the diagram.

The displacement after half-circle is

AB = OA + OB

= r + r

= 2r

If you walked at an average speed of 102 m/s, how long would it take to cross a road that is 16-m wide?

Answers


It would take (16 m) / (102 m/s) = 0.157 second.

The reason it would take such a short time is that
102 m/s is the same as roughly 228 miles per hour.

25. Kurt drinks frozen fruit juice from a small cup. He measures the amount of fruit juice in the cup. Which property is Kurt measuring? A. density B. height C. temperature D. volume

Answers

I think it's volume!

Use the terms atom and element to explain what makes silver and gold different

Answers

An element is a substance made of many atoms of the same kind. Silver and gold are different elements, for the following reason:
- silver is an element whose atoms have atomic number 47 (i.e., an atom of silver contains 47 protons and 47 electrons)
- gold is an element whose aroms have atomic number 79 (i.e., an atom of gold contains 79 protons and 79 electrons)

What will happen to the brightness of the lamp when the 
the slider is moved towards x

Answers


The rheostat is used to kind of  'spread out' the battery voltage,
you might say.  It's like the whole battery voltage is spread out
along the length of the rheostat, and you can connect to any point
you want, from the negative side of the battery (Y) to the positive
side (X), and every point in between, and you get whatever the
voltage is at that particular point.

One side of the light bulb (and the voltmeter) is connected to the
negative side of the battery, and you can't change that.

But the other side of the bulb (and the voltmeter) is connected to
the slider, which can be slid anywhere between 'x' and 'y'.

When the slider is down at 'y', that's the negative side of the battery.
So both sides of the lamp are connected to the same place, there's
no voltage across the lamp, and it just sits there, cool and dark.

When the slider is all the way up at the 'x' end, that's the positive
side of the battery.  So the full battery voltage is connected across
the lamp, and the lamp sparkles bright and hot.

When the slider is someplace in between, then only a part of the
full battery voltage is across the lamp (and the voltmeter).
The higher the slider is ... the closer it is to 'x' ... the more voltage
there is across the lamp.  The brighter the lamp shines, and the
higher the voltmeter reads.

Plz help me with this!

Answers

A conductor is something which allows electricity to pass through it
an example is a coin
An insulator is something which cannot allow electricity to pass through it
an example is plastic (or plastic cotton reel, plastic container ect.)
Static electricity is when you rub two things together to create static

I'm not sure if i helped on the last question but i am definitely sure of the first ones
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