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3 years ago

L. What does it mean to "convert" from one unit to another? Give an example.

Physics

2 answers:

TiliK225 [7]3 years ago

5 0

These are four questions and four answers

Question 1. What does it mean to "convert" from one unit to another? Give an example.

Convert from one unit to another is transforming or changing the magnitude to an equivalent measure according to a different pattern of comparison or unit of measure.

For example, converting from meter to centimeters, means to transform the unit of measure (the pattern of comparison) from meter to centimeter.

When your measure is 3 meters, means the length is 3 times the standard pattern named meter.

Therefore, converting it to centimeters means that you want to know how many times is 3 meters relative to the a new pattern named centimeter.

Since, 1 meter equals 100 cm, you build a conversion factor which you can use to make the conversion:

1 m = 100 cm ⇒ 1 = 100 cm / 1 m

∴ 3 m = 3 m × 100 cm / 1 m = 300 cm.

Question 2. What are the general mathematical operations you use when converting from one SI unit to another?

The most common mathematical operations are the basic ones: addition, substraction, multiplication and division.

See one example of each one:

a) Addition:

Transform 20°C to K: 20 + 273.15 K = 293.15 K

b) Subtraction:

Convert 300 K to celsius degrees: 300 - 273.15°C = 26.85°C

c) Multiplication

Convert 1000 Km to meter

1000 Km × 1000 m/Km = 1,000,000 m

d) Division

Convert 1540 mm Hg to atm

1 atm = 760 mmHg ⇒ 1 = 760 mmHg / atm

1540 mmHg / (760 mmHg / atm) = 2.026 atm

Question 3. How many meters do you cover in a 10 km (10-K) race?

This requires to convert 10 km to the equivalent number of meters.

Conversion factor: 1 km = 1000 m ⇒ 1 = 1000 m/Km

∴ 10 Km = 10 Km × 1000 m/km = 10,000 m ← answer.

Quesiton 4. An Olympic swimming pool is 50 meters long. You swim from one end to the other four times.

a. How many meters do you swim?

4 laps × 50 m/lap = 200 m ← answer

b. How many kilometers do you swim?

1 = 1 km / 1000m

200 m = 200 × 1 km / 1000 m = 0.200 km ← answer

c. How many centimeters do you swim?

1 m = 100 cm ⇒ 1 = 100 cm / m

200 m = 200 m × 100 cm/m = 20,000 cm ← answer

ladessa [460]3 years ago

5 0

L. What does it mean to "convert" from one unit to another? Give an example.
To convert means is to obtain an equivalent value with a specific unit to another unit. An example would be <span>1 inch is equal to 2.54 cm.</span>

2. What are the general mathematical operations you use when converting from one SI unit to another?
The mathematical operations used in converting units would be multiplication and division.

3. How many meters do you cover in a 10 km (10-K) race?

4. An Olympic swimming pool is 50 meters long. You swim from one end to the other four times.
a. How many meters do you swim?
50 x 4 = 200 meters
b. How many kilometers do you swim?
200 meters = 0.20 kilometers
c. How many centimeters do you swim?
200 meters = 20000 centimeters

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Maru [420]

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3 years ago

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Birds resting on high-voltage power lines are a common sight. the copper wire on which a bird stands is 1.28 cm in diameter and

nekit [7.7K]

Answer:

$8\cdot 10^{-4} V$

Explanation:

First of all, let's find the cross-sectional area of the copper wire. The radius of the wire half the diameter:

$r=\frac{d}{2}=\frac{1.28 cm}{2}=0.64 cm=6.4\cdot 10^{-3} m$

So the area is

$A=\pi r^2 = \pi (6.4\cdot 10^{-3} m)^2=1.29\cdot 10^{-4} m^2$

Now we can calculate the resistance of the piece of copper wire between the bird's feet, with the formula:

$R=\rho \frac{L}{A}$

where

$\rho=1.68\cdot 10^{-8} \Omega m$ is the resistivity of copper

$L=4.12 cm=4.12 \cdot 10^{-2} m$ is the length of the piece of wire

$A=1.29\cdot 10^{-4} m^2$ is the cross-sectional area

Substituting, we find

$R=(1.68\cdot 10^{-8} m^2)\frac{4.12\cdot 10^{-2} m}{1.29\cdot 10^{-4} m^2}=5.4\cdot 10^{-6} \Omega$

And since we know the current in the wire, I=149 A, we can now find the potential difference across the body of the bird, by using Ohm's law:

$V=IR=(149 A)(5.4\cdot 10^{-6} \Omega)=8\cdot 10^{-4} V$

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3 years ago

A 1200kg car moving at 25m/s has the brakes applied with a deceeration of 8.0m/s^2. How far does the car travel before it stops?

Lostsunrise [7]

V=vnaut+at 0(want it to stop)=25+-8t(negative accel cuz its deceling)
-25/-8=t t=3.125 seconds or with sig figs 3.1 seconds
x=xnaut+vnaut*time+1/2*a*time^2
x(where it ends up)=0(we start distance from when it started to brake)+25*3.1+1/2*-8*3.1^2=39.06 meters or 39.1 meters
x=0+25*3.1-.5*8*3.1^2 is the same equation as above with nothing written in. Are you in physics ap or reg? either way friend me lol(just joined website tonight)

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3 years ago

Express force in terms of base units

MariettaO [177]

<h2><u>Answer:</u></h2>

<u></u>

<u>Force = kgm/s² ⟶ Newton</u>

<h2><u>Explanation:</u></h2>

<u></u>

According to the formula we've learnt,

Force = mass × acceleration.

To find force in terms of base units, we must first identify the base SI units of mass & acceleration.

Base SI unit of mass = kg (kilogram)

Base SI unit of acceleration = m/s² (meter per second squared)

So, the base unit of force is,

Force = mass × acceleration.

Force = kg × m/s²

<u>Force = kgm/s² ⟶ Newton</u>

________________

Hope it helps!

$\mathfrak{Lucazz}$

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2 years ago

The flow of electrons in a circuit follows a path from the negative terminal of the battery to the positive terminal

SVEN [57.7K]

Answer:

No it's not true electric grow from Positive terminal to negative terminal

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