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Alisiya [41]
3 years ago
7

Katie kangaroo takes 0.25hours (15mins) to reach her friends house which is 7.5 miles away how fast was she hopping.

Physics
1 answer:
alina1380 [7]3 years ago
6 0

Answer:

30mph

Explanation:

7.5 miles / .25 hours = 30 mph

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The human ear can detect a remarkable range of sound intensities. The quietest sound that we can hear has an intensity of 10−1
SIZIF [17.4K]

Answer:

I = Io 10^{β/10}

Explanation:

To find a formula for the intensity of sound waves you use the fact that there is a great range of intensity that human can perceive.

The use of logarithms are useful for this kind of systems. For example, if you want a 10 scale for the measurement of the sound level  you can write:

\beta=10log(\frac{I}{I_o})    (1)

I: intensity of sound

Io: hearing threshold

From the equation (1) you can find I in terms of Io and β. You use properties of the logarithms to obtain:

\beta=log(\frac{I}{I_o})^{10}\\\\10^{\beta}=10^{log(\frac{I}{I_o})^{10}}\\\\10^{\beta}=(\frac{I}{I_o})^{10}\\\\I=(I_o^{10}10^{\beta})^{\frac{1}{10}}=I_o10^{\frac{\beta}{10}}

5 0
3 years ago
Using the human species as an example, explain what is meant by variation of traits
Ronch [10]
A variation of traits could be a variation of personality traits? everybody is different? what I do know Is that variation can be inherited or environmental which means that you get it from your ancestors through DNA or you get it from the environment around you
5 0
3 years ago
Short-range forecasts tends to ________ longer-range forecasts.
spin [16.1K]
<span>Short-range forecasts are more accurate than longer range ones. Short term forecasts may use mathematical techniques such as moving averages and, exponential smoothing. Longer term forecasts not only use different methodologies, such as qualitative vs. quantitative, they also tend to consider different issues.</span>
5 0
4 years ago
The universe is mostly made up of what?
Viktor [21]
D. Empty Space

Imagine an apple in the center of a football field. Pretend like that apple is the nucleus of an atom. The electrons would be at the end-zones. The universe is just a butttonne of empty space
5 0
4 years ago
The age of a piece of wood from an archeological site is to be determined using the Carbon-14 method. The activity of the sample
Bezzdna [24]

Answer:

4589.05 year

Explanation:

The relation of activity is given by A=A_0e^{\lambda t} we have given \frac{A}{A_0}=0.574

Half life T=5730\ years

We know that half life T=\frac{0.693}{\lambda }

\lambda =\frac{0.693}{5730}=1.2094\times 10^{-4}\ per\ year

So 0.574=e^{-1.2094\times 10^{-4}t}

e^{1.2094\times 10^{-4}t}=\frac{1}{0.574}=1.742

{1.2094\times 10^{-4}t}=ln1.742=0.555

t=\frac{0.555}{1.2094\times 10_{-4}}=4589.05\ year

7 0
3 years ago
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