Nếu tăng khoảng cách giữa hai điểm lên 4 lần thì lực tương tác tĩnh điện giữa chúng sẽ

Answers

Answer 1

Answer:

điện giữa chúng s

Explanation:

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Salmon often jump waterfalls to reach theirbreeding grounds.Starting 3.16 m from a waterfall 0.379 min height, at what minimum speed must asalmon jumping at an angle of 37.6◦leave thewater to continue upstream? The accelerationdue to gravity is 9.81 m/s2.Answer in units of m/s.
Two students are studying for a Science Test. On the table, they had a glass of water and identical cell phones. Both of their phones had run out of battery, therefore they were both charging in the same wall outlet. One student’s charging cord was 3ft and the other student’s charging cord was 9ft. which of the phones charged the fastest using Ohm’s Law. Cite evidence to support your theory.
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Plz tell me what is dry ice?

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

How many 176 ohm resistors are connected in series to get a current of 5 a on 220 v battey

Answers

Total resistance = voltage / current = 220 / 5 = 44 ohms .

Even one 176-ohm resistor is too much. The current through it is 1.25 A,
and more than one of them in series reduces the current even further.

Connecting them in parallel, however . . .

Four resistors of 176-ohms each, in parallel, have a net effective resistance
of 176/4 = 44 ohms ... exactly what you need to do the job.

The force of air particles over an area is?

Answers

Answer;

Air pressure

Explanation;

Pressure is the force that is applied over a unit of area. Air pressure is the weight of air molecules pressing down on the Earth. It is the force exerted by air particles on the earth's surface.
The column of air extends to the top of the atmosphere. As one move up increasing the altitude, the air pressure decreases since the air column is reduced.

That's the "air pressure" everywhere on that area.

A student who weighs 550 N is wearing a backpack that weighs 80 N. The student is standing still on level ground. Give your answers to the following questions in newtons. Remember, enter only the number; don't try to enter the units.a) What is the magnitude of the net force on the student?b) What is the magnitude of the contact force on the student by the backpack?
c) What is the magnitude of the contact force on the student by the ground?

Answers

Answer:

Explanation:

a) The magnitude of the net force on the student = 0 N since the student is standing still on level ground and upward reaction force = downward force.

b) the magnitude of the contact force on the student by the backpack = 80 N since the student was backing the backpack

c) the magnitude of the contact force o the student by the ground = 550 N + 80 N = 630 N reactional force on the student

Under what conditions can light be modeled like a ray? Like a wave?

Answers

when the aperture or object size is equivalent to the wavelength of light

do you think that this method of identifying unknowns would be effective for identifying any unknown element?

Answers

Unknowns, represented by variables, are effective for identifying the value. They stand for a certain amount, and solving for them would uncover values, like force etc.

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When one type of energy changes to another type of energy *A. constantB. energy conservationC. energy transformationD. Other: