PHYSICS HIGH SCHOOL

What is the advantage of a gold leaf electroscope ?

Answers

Answer 1
Answer: It's to determine if there is a charge on an object/body or not and what kind of charge as well. Hope this can help!

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Answers

The right answer for the question that is being asked and shown above is that: "(d)-2.78x10^-10 C."  A small object A, electrically charged, creates an electric field. At a point P located 0.250m directly north of A, the field has a value of 40.0N/C directed to the south.

A piece of metal and a piece of brick are both sitting in the sun if both are the same mass what property of matter will make the metal feel hotter to touch

Answers

Metals are highly conductive both electrically and thermally because of its highly ordered crystalline structure of metallic particles. Brick is poor conductor and will be less hot than metal.

What is conduction?

Conduction is the mechanism of heat transfer in solids. Solids are composed of closely packed particles arranged in a chain with strong intermolecular forces.

Metals are highly conductive. They have free electrons which are delocalized  in the crystal lattice. They can be easily transited through and make the material conductive.

Bricks is poor conductor of heat and odes not conduct electrically, it easily melts at high temperatures and easily cools as well. Therefore, at the surface of sun, the highly conductive metal will be  more hotter.

To find more on conduction, refer here:

brainly.com/question/18132856

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The piece of metal will feel hotter to touch because of its heat conductance. whereas the brick does not conduct heat as well as the metal. Hence the piece of metal feeling hotter to touch. 

A bicyclist is in a 50-km race. He says he had an average velocity of 35. What is missing in the cyclist’s velocity? A. units only B. units and distance C. direction only D. units and direction

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A. Units 
the rest can be understand that he did not clarify

A single star in the process of forming starts by spinning slowly (while it is quite large and relatively cool.) As the star collapses under the pull of its own gravity, its size decreases. As a result, its rate of spinning:_____.

Answers

Answer:

Explanation:

According to the conservation of momentum, when the external torque is not applied on the system, then the angular momentum of the system is conserved.

I x ω = constant

I_(1)\omega _(1)=I_(2)\omega _(2)

where, I is the moment if inertia and ω is the angular velocity

As the star is collapsed, the radius decreases and hence the moment of inertia also decreases.

According to the law, the angular velocity increases, thus the rate of spinning increases.

Which best explains why the shapes of a liquid can change

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the shape of a liquid can change because the atoms in it are not close together to form a solid, they flow freely.
The shape of a liquid can change because of the bonds between its atoms. Atoms in a liquid are loosely bonded, allowing them to roll over one another but not completely escape one another. In contrast, the atoms in a solid are so closely packed together that they can only vibrate in place, while the atoms in a gas have such little attraction between them that they fly in every direction and do not stay near one another at all. In a liquid, the atoms still stay close to one another, but are able to move, changing the overall shape of the liquid.

Hope this helps!

Notes on electric bulb

Answers

The question describes a hazardous practice that should be avoided in the home. 
Areas of the glass having ink, marker, or Post-its on them can cause uneven heating
of the glass, leading to uneven expansion and, sooner or later, fracture of the glass.
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