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3 years ago

What is one reason that electromagnetic waves are used in long-distance communication?

Physics

1 answer:

Ronch [10]3 years ago

8 0

I believe the answer is C or A but I’m not sure

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What form of energy is most abundant on earth

Kipish [7]

Solar energy is the most abundant energy resource on earth.

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4 years ago

Human population growth rates are increasing. Assuming that the biocapacity of earth does not change, what will need to happen t

iogann1982 [59]

I think it would need to decress bro

3 0

3 years ago

Read 2 more answers

A wheel moves in the xy plane in such a way that the location of its center is given by the equations xo = 12t3 and yo = R = 2,

Stella [2.4K]

Answer:

the velocity of the point P located on the horizontal diameter of the wheel at t = 1.4 s is $P = 104.04 \hat{i} -314.432 \hat{j}$

Explanation:

The free-body diagram below shows the interpretation of the question; from the diagram , the wheel that is rolling in a clockwise directio will have two velocities at point P;

the peripheral velocity that is directed downward $(-V_y)$ along the y-axis

the linear velocity $(V_x)$ that is directed along the x-axis

Now;

$V_x = \frac{d}{dt}(12t^3+2) = 36 t^2$

$V_x = 36(1.7)^2\\\\V_x = 104.04\ ft/s$

Also,

$-V_y = R* \omega$

where $\omega$ (angular velocity) = $\frac{d\theta}{dt} = \frac{d}{dt}(8t^4)$

$-V_y = 2*32t^3)\\\\\\-V_y = 2*32(1.7^3)\\\\-V_y = 314.432 \ ft/s$

∴ the velocity of the point P located on the horizontal diameter of the wheel at t = 1.4 s is $P = 104.04 \hat{i} -314.432 \hat{j}$

3 0

4 years ago

Bone has a Young's modulus of about

Oksanka [162]

Answer:

505.62 mm

Explanation:

Young's modulus of a material is given by,

$Y=\frac{Stress}{Strain}$

Stress is the force experienced by the material per unit area (which is why stress has the same units as pressure).

Strain is the ratio between the change in length/area/volume to the original length/area/volume of the material (and hence a dimensionless quantity). Basically, it gives us a measure of the change in dimensions due to the stress experienced.

So, for the given problem,

$Y=\frac{Stress}{\Delta L/L}$

or, $1.8\times100=\frac{1.59\times108}{\Delta L/0.53}$ (since we need to find the compression of the bone at the critical stress point)

or, $\Delta L=\frac{1.59\times108\times0.53}{1.8\times100} m=0.50562m=505.62mm$

8 0

3 years ago

A person on a diet loses 1.6 kg in a week. How many micrograms/second (µg/s) are lost?

Ivan

Based on the given values above, in order for us to get the answer, we need to convert the units first. So in 1 kilogram, there is 1,000,000 micrograms. In this case, 1.6 kilograms is 1,600,000 micrograms. For the week to seconds, 1 week is equivalent to 604,800 seconds. Therefore, 1,600,000 micrograms/604,800 seconds. So we are going to simplify this. So it would be 2.65<span>µg/s. Hope this answers your question.</span>

8 0

3 years ago