FAM I ASKED Energy levels in atoms? Physics Year 11 GCSEALMOST 23 HOURS AGO SOMEONE ANSWER IT

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Answer 1

Answer:

Answer:

fixed distances from the nucleus of an atom where electrons may be found

Explanation:

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What is distance and direction of an object from its starting point

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The distance and direction of an object from its starting point is called displacement. The main difference between distance and displacement is the consideration of distance in displacement. Distance is a scalar quantity, while displacement is a vector quantity. Scalar quantities don't take note of direction, while vector quantities do.

When heating a substance, a phase change will start to occur when the kinetic energy of the particles is _____________ the attractive forces between the particles. Question 8 options: A. great enough to combine
B. low enough to combine
C. low enough to overcome
D. equal to
E. great enough to overcome

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Answer: E. great enough to overcome.

Explanation: The three phases of the substances are solid, liquid and gas.

When a substance is heated, that is the molecules gain kinetic energy as kinetic energy is directly proportional to temperature.

The phase change will take place only when kinetic energy will be greater than the inter molecular forces as the molecules have to move in more random motion.

For example: Solid with high inter molecular forces are heated to convert it into liquid state only when kinetic energy will overcome the inter molecular forces of attraction.

Your answer is great enough to overcome :)

50 J of work was performed in 20 seconds. how much power was used to do this task?

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   Power = (amount of work done) / (time to do the work).

   = (50 J) / (20 sec)

   = 2.5 joule/sec = 2.5 watts .

The Correct answer to this question for Penn Foster Students is: 2.5 W

True or false : Scientific theories have withstood the test of time and are accepted as proven fact.

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False they are theories they haven't been proven

Atoms become charged by gaining or losing _____. electrons protons neutrons

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Electrons

It's not neutrons because neutrons don't have a charge (they're not positive or negative). They don't make a difference in the charge of an atom.

It's not protons because atoms don't lose or gain protons. They stay in the nucleus.

Electrons, however, are not in the nucleus. They fly crazy fast around the nucleus and can sometimes get sucked in by the nucleus of another atom. Electrons are also negatively charged. Gaining electrons makes an atom negatively charged. Losing electrons makes an atom positively charged.

When the engineer first sees the car, the locomotive is 100m from the crossing and its speed is 30m/s. If the engineer reaction time is 0.47 s what should the magnitude of the minimum deceleration to avoid an accident?