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Anuta_ua [19.1K]
4 years ago
10

Based on the principles of convection, conduction and thermal radiation, which scenario below is most similar to the following s

ituation?
Heat traveling through the ceiling from your bedroom to the attic.
A) Feeling a metal wire get warmer as you roast a marshmallow over a fire.
B) Warm air rising in a room where the air is moving.
C) The sun warming up the roof on a house.
D) Cold water sinking in a pot of water being warmed up on the stove.
Physics
2 answers:
Ket [755]4 years ago
6 0

The answer is


A) Feeling a metal wire get warmer as you roast a marshmallow over a fire.


HOPE I HELPED (:

Ksivusya [100]4 years ago
5 0

The situation (heat going through the ceiling) describes
conduction ...
heat going from one place to another by
soaking through some material.

A).  This is the one.  Heat goes from from the marshmallow
to your hand by soaking through the wire.   This is conduction too.

B).  No.  The heat in the room goes from the floor to the ceiling
because the warm air rises and carries it there.  This is convection.

C).  No.  There's nothing for the heat to soak through between
the sun and the roof, and nothing that can move from the sun
to the roof and bring the heat with it.  This is radiation.

D).  No.  Cold water sinks from the surface to the bottom because
warm water rose from the bottom to the surface, taking heat with it. 
This is convection.

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Answer:

The leaves of the electroscope move further apart.

Explanation:

This is what happens; when the positive object is brought near the top, negative charges migrating from the gold leaves to the top. This is because the negative charges in the gold are attracted by the positive charge. Thus, it leaves behind a net positive charge on the leaves, though the scope remains neutral overall. To that effect, the leaves repel each other and move apart. If a finger touches the top of the electroscope at the moment when the positive object remains near the top, it basically grounds the electroscope and thus the net positive charge in the leaves flows to the ground through the finger. However, the positive object continues to "hold" negative charges in place at the top. Ar this moment the gold leaves have lost their net positive charge, so they no longer repel, and they move closer together. If the positive object is moved away, the negative charges at the top are no longer attracted to the top, and they redistribute themselves throughout the electroscope, moving into the leaves and charging them negatively.

Thus, the leaves move apart from each other again and we now have a negatively charged electroscope. If a negatively charged object is now brought close to the top, but without touching, the negative charges already in the electroscope will be repelled down toward the leaves, thereby making them more negative, causing them to repel more, and hence move even further apart.

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What is the repulsive force between two pith balls that are 9.00 cm apart and have equal charges of -28.0 nC?
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Answer:

Force, F=8.71\times 10^{-4}\ N

Explanation:

Given that,

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Let F is the repulsive force between two pith balls. We know that the repulsive force between two charges is given by :

F=k\dfrac{q_1^2}{d^2}

F=9\times 10^9\times \dfrac{(-28\times 10^{-9})^2}{(0.09)^2}

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or

F=8.71\times 10^{-4}\ N

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