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4 years ago

Which statement about the physical properties of matter is true? (15)

Physics

1 answer:

Maslowich4 years ago

7 0

Answer:

Psisical properties used to be considered the properties that can be modified by phisical means. New theories state that chemical properties of matter are interrelated to the phisical ones

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When energy is transformed or changed from one form into another, some of the energy will be lost to the environment as?

sasho [114]

Generally it is lost as heat.

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3 years ago

Which statement is true concerning the evidence for black holes?

Luba_88 [7]

Scientists can see the effect of black holes on nearby stars.

So, option B is your answer.

Hope this helps!

8 0

4 years ago

I need help with my homework please? I will give a lot of points and a brainlist.

Vikki [24]

True

All metals attract magnets

Yes true

Away from magnetic field if you place something it won't attract that

False

Its only possible in case of electromagnetic force fields .

False

Electromagnetic force field

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2 years ago

at constant pressure by what fraction of its volume will aquantity of gas change if the temperature changes from -173degree C to

irinina [24]

Answer:

The volume of the gas becomes three times the initial volume.

Explanation:

Given that the pressure is constant, and temperature changes from -173degree C to 27degree C.

So, the initial temperature, $T_1$ = -173 degree C = -173+273 = 100 K.

The final temperature, $T_2$ = 27 degree C = 27+273=300 K.

As the pressure is constant, so $P_1=P_2$ .

Let V_1 and V_2 be the initial and final volume respectively.

Assuming that the given gas is ideal gas.

So, applying the ideal gas equation

PV=nRT

where n is the number of moles of the gas and R is the universal gas constant.

For the initial state, $P_1V_1=n_1RT_1\cdots(i)$

and for the final state, $P_2V_2=n_2RT_2 \cdots(ii)$

Dividing the equation (i) by (ii), we have

$\frac {P_1V_1}{P_2V_2}=\frac {n_1RT_1}{n_2RT_2} \\\\\frac {P_1V_1}{P_2V_2}=\frac {n_1T_1}{n_2T_2}$

As the mass of the gas is not changing, so $n_1=n_2$ , then

$\frac {P_1V_1}{P_2V_2}=\frac {T_1}{T_2}$

As the pressure is not changing, so $P_1=P_2$ , then

$\frac {V_1}{V_2}=\frac {100}{300}$

$V_2=3V_1$

So, the volume of the gas becomes three times the initial volume.

7 0

4 years ago

What is Newton's Second Law of Motion? (2 points) Every reaction is equal to the force applied. Forces are balanced when they ar

raketka [301]

Well, they're not quite the way Newton expressed it, but out of all this mess of statements, there are two that are correct AND come from Newton's 2nd Law of Motion:

-- The smaller the mass of an object, the greater the acceleration of that object when a force is applied.

-- The greater the force applied, the greater the acceleration.

For the other statements in the question:

-- Every reaction is equal to the force applied. True; comes from Newton's 3rd law of motion.

-- Forces are balanced when they are equal and opposite. True; kind of a definition, not from Newton's laws of motion.

-- An object at rest or in motion will remain at rest or in motion unless acted upon by an unbalanced force. True; comes from Newton's 1st law of motion.

5 0

3 years ago