PHYSICS MIDDLE SCHOOL

Will give brainliest to the correct answer.

Answers

Answer 1

Answer:

Answer:

The acceleration of the car is $1.432 m/s^(2)$

Explanation:

We are assuming rightward coordinate positive and all quantities are along this direction

We know,

$a = (dv)/(dt)$

where a - acceleration, v=velocity, t=time and x=displacement

multiply by dx in both sides

$adx = (dv)/(dt) dx$

but we know $(dx)/(dt) = v$

Therefore,

$adx = vdv$

Here we integrate both sides with proper limits

x ranges from 0 to 110 as v ranges from 29 to 34

p = 0, r = 110, q = 29, s = 34

$a\int\limits^r_pdx = \int\limits^s_q {v} \, dv$

a is given as constant thus can be pulled out of the integration

$a[110-0] = [(34^(2))/(2)- (29^(2))/(2)]$

Therefore,

Accelaration of the car is $1.432 m/s^(2)$

Note:

Here moving to the right doesn't mean anything significant other than the fact that all quantities are pointing in that direction. Therefore obtained acceleration is also towards the right

If you know equation of motion for constant acceleration as

$v^(2) -u^(2) = 2as$ you can plug in values in this equation to obtain value of a

v - final velocity

u - initial velocity

s - displacement

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The molecules of a substance are moving rapidly in a container. The molecules do not interact with each other. If the container is opened, the molecules will escape from the container. In what phase of matter are the molecules in the container?

Answers

Answer:

The phase of the molecule is gas.

Explanation:

Gas is one of the basic state of matter. The other fundamental states are solid and liquid. Gas have no definite shape nor size. Gases will occupy the whole space of a closed container. The properties of a gas is dependent on the volume of the container. Gases in a closed container tends to move rapidly .They move chaotically and randomly hitting the wall of the container. Gas have low density and are highly compressible. Gas moves rapidly due to the inter-molecular forces holding them is weak.

The forces holding them are weak and the molecules rarely interact they collide with each other constantly in a closed system. The molecules will escape immediately if the closed system is open because of the rapid nature of the molecules.

Answer:

Gas

Explanation:

True or false? Pluto is less than 2/3 the size of Earth's moon?

Answers

Pluto has 66% of the diameter of the Earth's moon and 18% of its mass.

So your answer is true

Hope I Helped You!!! :-)

Have A Wonderful Day!!! :-)

This is a math problem. To solve this we create a ratio of the radius of Pluto to the Moon.

$(737)/(1079)$ showing that Pluto is about 68% the size of the moon. You asked if Pluto was less than $(2)/(3)$ or 66%, or less the size of the moon.

68>66 so the answer is False if you are talking about the volume or size of the two.

If you are talking about density, the ratio would be:

$(1.88)/(3.34)$ which equals 56% so the answer would be True if you are inquiring about density.

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A sample of dna conains 500 adenine bases. how many thymine bases does it contain

Answers

If it contains 500 adenine bases, it contains 500 thymine bases as well, as the DNA pairings are A-T and C-G, there would be an equal amount A as T

Answer:

500

Explanation:

If a segment of one side of a DNA molecule has 500 adenine bases, then the other side of the same DNA molecule has 500 thymine bases. There are four nitrogenous bases in DNA. Adenine and Thymine are two of them. The other two bases are Guanine and Cytosine. The order in which these four bases is read is responsible for telling a cell how to make the proteins that it needs to use to function properly. For example, the bases, in a certain order, will tell the cell to create the protein responsible for transferring oxygen in the bloodstream

Why do the two elements silver and iron have different properties

Answers

Because the atomic number is diffrent and I belive that they also have diffrent atomic masses

Compare relative age with absolute age.

Answers

Answer & Explanation:

Relative age is the age of a rock layer (or the fossils it contains) compared to other layers. It can be determined by looking at the position of rock layers. Absolute age is the numeric age of a layer of rocks or fossils.

A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?A. The mass of the balloon increases because the size of the balloon has increased.

B. The mass of the balloon increases because the temperature of the balloon has increased.

C. The mass of the balloon stays the same because the gas inside the balloon still has same mass after it warms up.

D. The mass of the balloon stays the same because warming decreases the mass enough to cancel out the effect of increasing the size.


  Please explain why you chose your answer

Answers

A). No. Mass doesn't just appear out of thin air. The total amount of mass never changes, no matter what you do to it.

B). No. Same reason as (A).

C). Yes. The total amount of mass never changes, no matter what you do to it.

D). No. The amount of mass never changes, no matter what you do to it.

C is the correct answer

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