PHYSICS MIDDLE SCHOOL

an object at rest starts accelerating if it travels 30 meters to end up going 10 m/s what was it’s acceleration

Answers

Answer 1

Answer:

First we have to calculate the time taken to travel the distance 30 m, is

$t = (distance)/(velocity) = (30 \ m)/(10 \ m/s ) = 3 \ s$ .

Now from equation of motion,

$v = u + at$

Given, $v = 10 \ m/s$ .

As object starts from rest, so u = 0.

Substituting these values in above equation, we get

$10 \ m/s = 0 + a * 3 \ s \n\n a = (10)/(3) = 3.33 \ m/s^2$ .

Thus, the acceleration is $3.33 \ m/s^2$

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How many electrons do all halogen atoms need to fill their outer energy level?

Answers

Answer:

Seven

Explanation:

Because all halogens have seven valence electrons, they are “eager” to gain one more electron. Doing so gives them a full outer energy level, which is the most stable arrangement of electrons. Halogens often combine with alkali metals in group 1 of the periodic table.

Answer:

Halogens only need one electron to complete their valkance shells.

Explanation:

Halogens are present in the VIIA group of the periodic table so seven electrons are already present. one is needed to become stable.

Compare and contrast the processes of evaporation and condensation

Answers

Condensation is the change from a vapor to a condensed state (solid or liquid). Evaporation is the change of a liquid to a gas.

How should Sal correct his diagram?He should add five more dots so that the atom obeys the octet rule.

He should add ten more dots so that all thirteen electrons are shown.

He should add a single dot below the symbol.

He should add one dot below and one dot to the left of the symbol.

Answers

Since Sal drew the electron dot diagram of an aluminum atom, Sal should;

C. He should add a single dot below the symbol.

Answer: it's c

Explanation:

A bulldozer does 45,000 joules of work to push a boulder a distance of 30 meters.How much force is applied to push the?

Answers

Answer:

1500N

Explanation:

we have ,

w= f*d

45,000 =f * 30

f=45000/30

f=1500N..

Jared is reading an article about the heavy rains that have fallen recently in his town. But he can’t separate the facts from the opinions. Which sentences in the article state facts?It’s that time of year again when the days are wet and cool. The rainy season is the best season. Rain makes up part of Earth’s water cycle. Water evaporates from streams, lakes, and oceans, then condensation and precipitation occur in the form of rain. Precipitation in the form of rain is better than snow. Snow this time of year makes people gloomy. Rain is a great boon to local farmers. It helps their crops grow.
please help!!! i need to pick one sentience 99 POINTS!!!

Answers

Facts are the statements that are verifiable and are backed up by scientific evidence.

What are facts and opinions?

Facts are the statements that are verifiable and are backed up by scientific evidence while opinions are those statements that emanate entirely from the author.

The sentences in the article that state facts are;

It’s that time of year again when the days are wet and cool.
Rain makes up part of Earth’s water cycle.
Water evaporates from streams, lakes, and oceans, then condensation and precipitation occur in the form of rain.
Rain is a great boon to local farmers.

Learn more about facts:brainly.com/question/14979032

#SPJ2

Answer:

here you go!

Explanation:

green is right!! and red is wrong hope this helps!

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