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UkoKoshka [18]
3 years ago
11

Divide 0.0081 meters by 300 seconds and express the answer in scientific notation.

Physics
2 answers:
grigory [225]3 years ago
5 0

Answer:

\frac{0.0081}{300}

2.7 \times 10^{-5}

so this is given as

3 \times 10^{-5}

Explanation:

As we know that when two or more numbers are multiplied or divided then the result is always given by least number of significant numbers.

So here we have to divide two numbers

a = 0.0081

total significant digits = 2

b = 300

total significant digits = 1

as we divide two number then we got

\frac{a}{b} = \frac{0.0081}{300}

\frac{a}{b} = 2.7 \times 10^{-5}

now by rounding off the above number to one significant digit we have

\frac{a}{b} = 3 \times 10^{-5}

Trava [24]3 years ago
4 0
Hey

<span>.0081/300 = .000027 = 2.7 x 10^-5
</span>
Hoped I Helped
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Two resistors have resistances R(smaller) and R(larger), where R(smaller) &lt; R(larger). When the resistors are connected in se
ASHA 777 [7]

Answer:

R = 9.85 ohm , r = 0.85 ohm

Explanation:

Let the two resistances by r and R.

when they are connected in series:

V = 12 V

i = 1.12 A

The equivalent resistance when they are connected in series is

Rs = r + R

So, By using Ohm's law

V = i Rs

Rs = V / i = 12 / 1.12 = 10.7 ohm

R + r = 10.7 ohm    .... (1)

When they are connected in parallel:

V = 12 V

i = 9.39 A

The equivalent resistance when they are connected in parallel

R_{p}=\frac{R+r}{rR}

So, By using Ohm's law

V = i Rp

Rp = V / i = 12 / 9.39 = 1.28 ohm

\frac{R+r}{rR}=1.28    .... (2)

by substituting the value of R + r from equation (1) in equation (2), we get

r R = 8.36 ..... (3)

R-r = \sqrt{\left ( R+r \right )^{2}-4rR}

R-r = \sqrt{\left ( 10.7 \right )^{2}-4\times 8.36}=9 ..... (4)

By solvng equation (1) and (4), we get

R = 9.85 ohm , r = 0.85 ohm

8 0
3 years ago
Freezing Point Depression: Can someone explain this formula to me? ΔTf = Kfcm
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If the solution is treated as an ideal solution, the extent of freezing point depression depends only on the solute concentration that can be estimated by a simple linear relationship with the cryoscopic constant: ΔTF = KF · m · i ΔTF, the freezing point depression, is defined as TF (pure solvent) - TF (solution). KF, the cryoscopic constant, which is dependent on the properties of the solvent, not the solute. Note: When conducting experiments, a higher KF value makes it easier to observe larger drops in the freezing point. For water, KF = 1.853 K·kg/mol.[1] m is the molality (mol solute per kg of solvent) i is the van 't Hoff factor (number of solute particles per mol, e.g. i = 2 for NaCl).
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How much energy is needed to raise a 50kg block up from the ground to a height of 5 meters?​
miss Akunina [59]

Answer:

The answer to your question is    Pe = 2452.5 J

Explanation:

Data

mass = 50 kg

height = 5 m

gravity = 9.81 m/s²

Process

The energy of this process is Potential energy which is proportional to the mass of the body, the gravity and the height of the body.

           Pe = mgh

Substitution

           Pe = (50)(5)(9.81)

Simplification

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Answer:

Though you have not gave the choices, I do believe it is “testing”

Explanation:

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The frequency of the wheel is given by:
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And now we can find the angular speed of the wheel, which is related to the frequency by:
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