PHYSICS MIDDLE SCHOOL

a person pushing a stroller starts from rest, uniformly accelerating at a rate of 0.500 m/s2. What is the velocity of the stroller after it has traveled 4.75 m ?

Answers

Answer 1

Answer:

Answer:

Approximately $2.18 m\cdot s^(-1)$ .

Explanation:

Consider one of the equations for constant acceleration ("SUVAT" equations)

$v^(2) - u^(2) = 2 \; a \cdot x$ ,

where

$v$ is the final velocity of the object,
$u$ is the initial velocity of the object,
$a$ is the acceleration of the object, and
$x$ is the distance that the object had traveled while its velocity changed from $u$ to $v$ .

Note that unlike other SUVAT equations, this one does not ask for the time required for the speed of the object to change from $u$ to $v$ . Since in this problem, time isn't given, this time-less equation would particular useful.

Here

$v$ the final velocity needs to be found.
$u = 0$ for the stroller started from rest.
$a =\rm 0.500 \;m \cdot s^(-2)$ is the acceleration of the stroller, and
$x = \rm 4.75\; m$ is the distance that the stroller traveled while its velocity changed from $u$ to $v$ .

Rearrange the equation to isolate the unknown, $v$ :

$v^(2) = u^(2) + 2 \; a \cdot x$ .

Make sure that all units are standard, so that the unit of the output will also be standard. Apply the equation:

$v = \sqrt{u^(2) + 2 \; a \cdot x} = √(0^2 + 2 * 0.500 * 4.75 )\approx \rm 2.18\; m\cdot s^(-1)$ .

Hence the final velocity will be approximately $\rm 2.18 m\cdot s^(-1)$ .

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during a space shuttle launch about 830,000 kg of fuel is burned in 8 min. the fuel provides the shuttle with a constant thrust, or forward force. how does newton's second law of motion explain why the shuttle's acceleration in creases as the fuel is burned?

Answers

As the fuel burns, the shuttle accelerates in the creases because the acceleration of an object caused by a net force is inversely proportional to the size of the net force.

How does acceleration work?

The rate at which velocity, measured in terms of speed and direction, changes over time is known as acceleration. Anything is said to have been accelerated when it goes faster or slower in a straight line.

Because the direction is always shifting, motion on a circle accelerates even while the speed is constant.

A speed is acceleration, right?

Acceleration is the term used to describe a change in an object's speed or direction. Velocity changes at an acceleration rate. Recall that velocity consists of two elements: speed and direction.

To know more about Acceleration, visit-brainly.com/question/2303856

#SPJ2

The shuttles acceleration in the creases as the fuel is burned because the acceleration of the obect as produced by net force is directly proportional to the magnitude of the net force.

I will take my exam tommorrow, what shall i do?

Answers

Answer:

the most important thing to do is STUDY and practice, practice, practice. dont give up

Explanation:

If we say that one quantity is directly proportional to another quantity, does this mean that they are equal to each other?

Answers

If we say that one quantity is directlyproportional to another quantity, we do not mean they are equal to each other.

DIRECT PROPORTION:

The term "direct proportion" refers to the relationship between two variables in which a change in one causes a similar change in the other.

This means that when two quantities are directly proportional to one another, one quantity increases as the other increases and vice versa.

For example, if quantity A is directlyproportional to quantity B;

when quantity A increases, quantity B also increases
when quantity A decreases, quantity B also decreases.

Therefore, If we say that one quantity is directly proportional to another quantity, we do not mean they are equal to each other.

Learn more at: brainly.com/question/14664532?referrer=searchResults

NO !

It means that (one of them) divided by (the other one) is always the same number.

(Other people probably won't explain it to you this way, but I'm special, and this is true.

Anyway, the direct answer to your question is: No.)

Does a cell ever reach equilibrium

Answers

it nevers reaches equilibrium

Cells never reach equilibrium.

Dark clothing feels warmer than white clothing on a sunny day. Which interaction causes the dark clothing to feel warm?

Answers

Answer: Absorption

Explanation: Because the darker clothing absorbs the heat more than the lighter clothing beacuse of contrast i guess . A P E X

Explanation:

The darker the object, the better it emits heat, because it's a better absorber of light. On the other hand, a white object appears white because it reflects all the different wavelengths and absorbs little to no light.

As the mass and volume increases, the densit will
Increase, decrease, or remain the same

Answers

We can't tell from the information given.

Density is the RATIO of mass to volume. So, if mass and volume both
increase but their ratio decreases, then the density decreases.

But if mass and volume both increase and their ratio also increases,
then the density increases.

Examples:

-- Start with a pile of some kind of substance.
Mass = 150 grams
Volume = 100 cm³

Density = (mass) / (volume) = (150 gm)/(100cm³) = 1.5 gm/cm³

-- Add 50 grams of mass. Mass = 200 gm.
Add 50 cm³ of volume. Volume = 150cm³.

   Density = (mass) / (volume) = (200 gm)/(150 cm³) = 1.33 gm/cm³.
Density decreased.

-- To the original pile, add 100 grams of mass. Mass = 250 gm.
   add 50 cm³ of volume. Volume= 150 cm³.

   Density = (mass) / (volume) = (250 gm)/(150 cm³) = 1.67 gm/cm³.
Density increased.

-- To the original pile, add 60 grams of mass. Mass = 210 gm.
   add 40 cm³ of volume. Volume = 140 cm³.

   Density = (mass) / (volume) = (210 gm)/(140 cm³) = 1.5 gm/cm³.
     Density no change.
   Same as the original pile.

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