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3 years ago

Why use units with your number? Why is putting a unit with your number important?

2 answers:

5 0

Assume you need to know to what extent it will take you to get from your
house to some other place. You ask me, and I say, "It will take 5."
5 what? 5 minutes? 5 hours? 5 days?
We utilize numbers to speak to stuff on the planet. Some of the time it's simply
checking, e.g.,
I discovered 9 mushrooms today.
I discovered 18 yesterday.
So now I have 9 + 18 = 27 mushrooms.
Yet, some of the time we're utilizing numbers to speak to things that we measure,
like separations or weights or ranges:
I have a board 12 feet long.
I need to cut it into pieces 3 feet long.
I can cut it into (12 feet)/(3 feet for each piece) = 4 pieces.
We can utilize diverse methods for measuring something, e.g.,
I have a board 144 inches in length.
I need to cut it into pieces 3 feet long.
In the event that I simply isolate 144 by 3, without focusing on units, I get an
reply of 48. In any case, what does it mean? It's an indistinguishable issue from
some time recently, since 144 inches is an indistinguishable thing from 12 feet! So I would do well to
find a similar solution - 4 pieces, not 48. To find a similar solution, I have
to change my units:
I have a board 144 inches in length.
I need to cut it into pieces 36 inches long.
I can cut it into (144 inches)/(36 inches per piece) = 4 pieces.
So units are the means by which we ensure that our figurings about the world

jek_recluse [69]3 years ago

3 0

Answer:

Explanation:

When we measure a given physical quantity then after measurement we give the magnitude as well as unit along with the measurement

Here number gives the magnitude of the measurement what we did and unit gives an idea what unit is for the given measurement we used

Here unit is essential while we did any measurement because unit of the measurement may be different for different group of people but the quantity is always same when we compare them along with the unit

For example we know that

$1 ft = 12 inch$

here the numbers are different in two unit system but the quantity we compared is same.

so it is always essential to put units with all measurement to have complete idea of the quantity that is measured

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A football player is running with a velocity or 10 m/s. At that velocity, his momentum is 2500 kg*m/s. What is the football play

DedPeter [7]

The mass of the football player is 250 kg.

<u>Explanation:</u>

Momentum is defined as the product of mass and velocity. So here the velocity (v) is given as 10 m/s and the momentum is given as 2500 kg m /s. So we can determine the mass (m) of the player by substituting the known terms in the formula of determining momentum as shown below.

$\text {Momentum}(p)=m \times v$

As we know the value of momentum and velocity, the mass can be found as,

$m=\frac{p}{v}=\frac{2500}{10}=250 \mathrm{kg}$

Thus, the mass of the football player is found to be 250 kg.

7 0

3 years ago

The vacuum pressure of a condenser is given to be 80 kpa. if the atmospheric pressure is 98 kpa, what is the gage pressure and a

dimaraw [331]

The absolute pressure is given by the equation,

$P_{abs}=P_{atm}-P_{vac}$

Here, $P_{abs}$ is absolute pressure, $P_{atm}$ is atmospheric pressure and $P_{vac}$ is vacuum pressure.

Therefore,

$P_{abs}=98 kPa-80 kPa=18kPa$

The gage pressure is given by the equation,

$P_{gage}=P_{abs}-P_{atm}$ .

Thus,

$P_{gage}=18kPa-98 kPa=-80 kPa$ .

In kn/m^2,

The absolute pressure,

$P_{abs}=18kPa(\frac{1kN/m^2}{kPa}) =18\ kN/m^2$

The gage pressure,

$P_{gage}=-80kPa(\frac{1kN/m^2}{kPa}) =-80\ kN/m^2$ .

In lbf/in2

The absolute pressure,

$P_{abs}=18\ kPa(\frac{1.45\times 10^{-1}\ lbf/in^2 }{1kPa} )=2.6\ lbf/in^2$

The gage pressure,

$P_{gage}=-80kPa(\frac{1.45\times 10^{-1}\ lbf/in^2 }{1kPa} )=-11.6\ lbf/in^2$

In psi,

The absolute pressure,

$P_{abs}=18\ kPa(\frac{1.45037738\times 10^{-1}\ psi }{1kPa})=2.610\ psi$ .

The gage pressure,

$P_{gage}=-80kPa(\frac{1.45037738\times 10^{-1}\ psi }{1kPa} )=-11.6030\ psi$

In mm Hg

The absolute pressure,

$P_{abs}=18kPa(\frac{7.5\ mm\ of\ Hg }{1\ kPa})= 135\ mm\ of\ Hg$

The gage pressure,

$P_{gage}=-80kPa(\frac{7.5\ mm\ of\ Hg }{1\ kPa})=-600\ mm\ of\ Hg$

3 0

3 years ago

MATCH THE NUMBER WITH THE APPROPRIATE VARIABLE <br> HELPP!!!!! its for my final

sergiy2304 [10]

Answer:

velocity
spéed
distance
displacement
time

5 0

2 years ago

An experiment is designed to investigate the relation between the pressure and temperature in a tank that has a constant volume

viva [34]

Answer:

3rd order polynomial

Explanation:

Given that the increase in the order of the polynomial the error between the curve fit and measured data will decreases hence :

The polynomial order that is best to use is the 3rd order polynomial, this is because using a 3rd order polynomial will produce a less variance and a low Bias

4 0

2 years ago

A hopper jumps straight up to a height of 1.3 m. With what velocity did he leave the floor

xxMikexx [17]

The velocity with which the jumper leaves the floor is 5.1 m/s.

<h3>What is the initial velocity of the jumper?</h3>

The initial velocity of the jumper or the velocity with which the jumper leaves the floor is calculated by applying the principle of conservation of energy as shown below.

Kinetic energy of the jumper at the floor = Potential energy of the jumper at the maximum height

¹/₂mv² = mgh

v² = 2gh

v = √2gh

where;

v is the initial velocity of the jumper on the floor
h is the maximum height reached by the jumper
g is acceleration due to gravity

v = √(2 x 9.8 x 1.3)

v = 5.1 m/s

Learn more about initial velocity here: brainly.com/question/19365526
#SPJ1

3 0

1 year ago