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3 years ago

PLEASE HELP!!!!!!!!!

Physics

2 answers:

Troyanec [42]3 years ago

7 0

Answer: Option (2) is the correct answer.

Explanation:

According to law of conservation of mass, mass can neither be created nor it can be destroyed but it can be converted into one form to another.

For example, when mass of a reactant in a chemical reaction is 15 grams then product formed by it will also weigh 15 grams.

This is means mass of the reactant has now converted into the mass of product according to law of conservation of mass.

Thus, we can conclude that 15 grams of products will be formed by the reaction.

nexus9112 [7]3 years ago

5 0

It’s 10 because when a reaction reacts it then goes down and lowers the reaction? Right

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The first car has twice the mass of a second car, but only half as much kinetic energy. When both cars increase their speed by 9

kirill [66]

Answer:

Speed of the car 1 = $V_1=8.98m/s$

Speed of the car 2 = $V_2=17.96m/s$

Explanation:

Given:

Mass of the car 1 , M₁ = Twice the mass of car 2(M₂)

mathematically,

M₁ = 2M₂

Kinetic Energy of the car 1 = Half the kinetic energy of the car 2

KE₁ = 0.5 KE₂

Now, the kinetic energy for a body is given as

$KE =\frac{1}{2}mv^2$

where,

m = mass of the body

v = velocity of the body

thus,

$\frac{1}{2}M_1V_1^2=0.5\times \frac{1}{2}M_2V_2^2$

$\frac{1}{2}2M_2V_1^2=0.5\times \frac{1}{2}M_2V_2^2$

$2M_2V_1^2=0.5\times M_2V_2^2$

$2V_1^2=0.5\times V_2^2$

$4V_1^2= V_2^2$

$2V_1= V_2$ .................(1)

also,

$\frac{1}{2}M_1(V_1+9.0)^2=\frac{1}{2}M_2(V_2+9.0)^2$

$\frac{1}{2}2M_2(V_1+9.0)^2=\frac{1}{2}M_2(2V_1+9.0)^2$

$2(V_1+9.0)^2=(2V_1+9.0)^2$

$\sqrt{2}(V_1+9.0)=(2V_1+9.0)$

$(\sqrt{2}V_1+ \sqrt{2}\times 9.0)=(2V_1+9.0)$

$(\sqrt{2}V_1+ 12.72)=(2V_1+9.0)$

$(2V_1-\sqrt{2}V_1)=(12.72-9.0)$

$(0.404V_1)=(3.72)$

$V_1=8.98m/s$

and, from equation (1)

$V_2=2\times 8.98m/s = 17.96m/s$

Hence,

Speed of car 1 = $V_1=8.98m/s$

Speed of car 2 = $V_2=17.96m/s$

8 0

3 years ago

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In a chemical reaction, one element replaces another element in a compound to form a new substance. Which of the following best

Andreyy89

Answer:

single replacement

Explanation:

In the question it says one element replaces another element which means there is only one replacement.

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The elements in a column of the periodic table _____.

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C. have similar properties
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What kind of scattering (Rayleigh, Mie, or non-selective) would you expect to be most important when radiation of the specified

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Answer:

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answer : attached table below

Explanation:

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02 molecules size = 10^-10m

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Attached below is a table showing the kind of scattering that is expected to occur at various wave lengths

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and For Mie scattering the wavelength is the same as the wavelength.

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3 years ago

When the displacement in SHM is equal to 1/3 of the amplitude xm, what fraction of the total energy is (a) kinetic energy and (b

Nesterboy [21]

Answer:

Explanation:

Given

Displacement is $\frac{1}{3}$ of Amplitude

i.e. $x=\frac{A}{3}$ , where A is maximum amplitude

Potential Energy is given by

$U=\frac{1}{2}kx^2$

$U=\frac{1}{2}k(\frac{A}{3})^2$

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$T.E.=\frac{1}{2}kA^2$

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7 0

4 years ago

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