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2 years ago

True or false: Equilibrium occurs when the quantity supplied exceeds the quantity demanded.

2 answers:

7 0

This is an economic question, just to add. This statement is wrong. Equilibrium is the point where quantity supplied meets the demand.
Supply and Demand are equal

Anastasy [175]2 years ago

4 0

False . IT IS FALSE. WE ARE TO LAZY TO READ ALL THAT.^^^^^

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A distance-time graph indicates that an object travels 2 m in 2 s and then travels another 80 m during the next 40 s. What is th

kumpel [21]

The average speed of the object is given by the ratio between the total distance covered and the total time needed for the motion:
$v= \frac{S}{t}$

The total distance covered is:
$S=2m + 80 m = 82 m$
while the total time of the motion is
$t=2s+40 s=42 s$

Therefore, the average speed of the object is
$v= \frac{S}{t}= \frac{82 m}{42 m}=1.95 m/s$

3 0

3 years ago

A soap bubble is essentially a thin film of water surrounded by air. the colors you see in soap bubbles are produced by interfer

scoray [572]

The colors we see in the bubble are produced by the interference between two waves: a) the wave reflected by the surface of the bubble b) the wave that travels inside the bubble and it is reflected by its back.
The condition for the constructive interference is that the phase shift between the two waves is an integer multiple of $2\pi$ . The phase difference between the two waves is
$\Delta \phi = k \Delta x - \pi$
where $\Delta x = 2t$ is twice the thickness of the bubble (since the second wave travels inside the bubble and it is reflected from the back), while $\pi$ is due to the fact that the first wave has an extra phase shift $\pi$ because it is reflected from a material (soap) with higher refraction index than the air.

So, in order to have constructive interference, we should require
$k \Delta x - \pi = 2m\pi$
where m is an integer. Substituting $\Delta x=2t$ and $k= \frac{2 \pi}{\lambda}$ , we have
$\lambda = \frac{2t}{m+ \frac{1}{2} }$
But here $\lambda$ is the wavelength in the soap; we need instead the wavelength in the air, which is
$\lambda' = n \lambda$
where n=1.33 is the refraction index.

Therefore, we have
$\lambda' = \frac{2nt}{m+ \frac{1}{2} }$

Using t=390 nm, and using different values of m, we find tha only m=1 and m=2 have wavelength in the visible spectrum: $\lambda'=415 nm$ and $\lambda'=692nm$ . These wavelengths correspond to red and violet, so the bubble appears as red-violet.

4 0

2 years ago

Read 2 more answers

A woman with mass 50 kg is standing on the rim of a large disk that is rotating at 0.80 rev/s about an axis through its center.

My name is Ann [436]

Answer:

angular momentum, $L=1.4\times 10^4\ kg-m^2/s$

Explanation:

Given that,

Mass of the woman, m = 50 kg

Angular velocity of the disk, $\omega=0.8\ rev/s=5.02\ rad/s$

Mass of the disk, m' = 2670 kg

Radius of the disk, R = 4 m

We need to find the magnitude of the total angular momentum of the woman–disk system. The moment of inertia of the system is equal to the sum of moment of inertia of women and the moment off inertia of the disk.

$I=mR^2+\dfrac{1}{2}m'R^2\\\\I=R^2(m+\dfrac{1}{2}m')\\\\I=(4)^2\times (50+\dfrac{1}{2}\times 270)\\\\I=2960\ kg-m^2$

The angular momentum is given by :

$L=I\omega\\\\L=2960\times 5.02\\\\L=14859.2\ kg-m^2/s$

$L=1.4\times 10^4\ kg-m^2/s$

So, the magnitude of the total angular momentum of the woman–disk system is $1.4\times 10^4\ kg-m^2/s$ . Hence, this is the required solution.