J. J. Thomson s experiments provided evidence that an atom A. is the smallest particle of matter.
B. contains negatively charged particles.
C. has a negative charge.
D. has a positive charge

Answers

Answer 1

Answer: J.J. Thomson's experiments provided evidence that an atom B.contains negatively charged particles.

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Joan makes the device shown in her science class.An illustration with a battery and ends labeled positive and negative. A wire is connected to the positive end of the battery and curls around an iron nail and connects back with the negative side of the battery.

What would happen to the magnetic field if she connects the battery in the opposite direction?

The field would stop.
The field would get stronger.
The field would reverse its poles.
The field would get weaker.

Answers

If she connects the battery in the opposite direction, the magnetic field would reverse its poles.

What is magnetic field?

The magnetic field is the region of space where an object experiences the magnetic force and obtain magnetic properties.

A wire is connected to the positive end of the battery and curls around an iron nail and connects back with the negative side of the battery. This arrangement will let the current flow from the positive end of the battery towards the negative terminal of the battery.

If the battery is connected in the opposite direction, the current will flow from negative to positive terminal.

Therefore, If she connects the battery in the opposite direction, the magnetic field would reverse its poles.

Learn more about magnetic field.

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Answer:

The field would reverse its poles.

Explanation:

The current flow will reverse directions which will reverse the poles in the magnetic field created around the iron nail.

In the Niagara Falls hydroelectric generating plant, the energy of falling water is converted into electricity. The height of the falls is about 48 meters. Assuming that the energy conversion is highly efficient, approximately how much energy is obtained from one kilogram of falling water? Therefore, approximately how many kilograms of water must go through the generators every second to produce a megawatt of power (106 watts)?

Answers

Answer:

2.124 kg of water

Explanation:

height of the falls is about 48 meters.

Mass of water needed is 1kg = 1000g

Power needed is 106 watts.

The amount of energy in 106 watts in one sec is 106 joules.

To calculate the energy of the 1kg falling water = Mgh

Energy = 1000*9.81*48

Energy = 470880 joules.

1 megawatt is = 1000000watts

The kilogram of water needed is 1000000/470880 = 2.124 kg of water

The force of repulsion between two like-charged particles will increase ifA) the distance between the charged particles is increased.

B) the distance between the charged particles is decreased.

C) the magnitude of the charge on both the particles is decreased.

D) the magnitude of the charge on one of the particles is decreased.

Answers

The force of repulsion between two like-charged particles will increase if the distance between the charged particles is decreased.

What is coulomb's law?

According to Coulomb's law: The magnitude of each of the electric forces with which two point-at-rest charges interact is directly proportional to the product of the magnitude of both charges

And inversely proportional to the square of the distance that separates them and has the direction of the line that joins them.

The formula will be given as:

$F=(kq_1q_2)/(r^2)$

We can see that the force is inversely proportional to the distance of the two charges.

To know more about coulomb's law follow

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Answer:

B). the distance between the charged particles is decreased.

Explanation:

Which spectral class does the sun belongs to

Answers

it belongs to a group named G-type stars

Help!!!!1. A material that can be hit without shattering is?
viscous, flammable, hard, malleable
2. At room temp., a substance with a melting point of 40% C is a?
solid, liquid, gas, mixture
3. what action involves a chemical change?
making ice cubes,adding sugar to tea, cutting wrapping paper, baking a cake
4.a substance that has a little tendency to change into other substance is said to have low?
reactivity, viscosity, density, conductivity
5. formation of a precipitate is usually evidence of?
the separation of a mixture, a chemical change, formation of a mixture, physical change

Answers

1. For the first one if it doesn't shatter then it is hard.
2. We sould consider that room temperature is usually from 18°C (64°F) to 23°C (73°F) and since the melting point of the substance is 40˚C the substance is liquid, because is melting point not an evaporation point it just melts from solid to liquid.
3. Well, in this one we have to consider that a chemical change it change the thing completely. So in this case is baking a cake because the products make the cake stop being them self and created something else.
4. It tends to have low reactivity. This is because viscosity means something like honey very sticky , density is how hard it is and lastly the conductivity I would believe is to pass electricity or current.
5. It is a physical change because the evaporated water transforms again into water and then fall as rain, snow or ice.
Hope it helped <3

A sunset appears red becouse