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4 years ago

If two sets of data are correlated, this means that:

Physics

2 answers:

lianna [129]4 years ago

5 0

<h2>If two sets of data are correlated, this means that: one set causes the other to happen. </h2>

Explanation:

Correlation indicates a relationship between two or more variables, but this relationship does not suggest cause and effect. When two sets of data are correlated, it means that as one variable changes, the other variable also changes.

The correlation can be measured by calculating a statistic called as correlation coefficient. The number from -1 to +1 indicates the strength and direction of the relationship between variables. The correlation coefficient is denoted by the letter r.

MariettaO [177]4 years ago

4 0

Answer:

The answer is B. They are related just took the quiz.

Explanation:

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A satellite orbiting Earth at an orbital radius r has a velocity v. Which represents the velocity if the satellite is moved to a

satela [25.4K]

Answer:

The correct answer is V√5

Explanation:

Let V be the velocity of the satellite orbiting at radius r.

Let V(5r) be the velocity of the satellite orbiting at radius 5r.

Recall:

Escape velocity is given by:

V = √(2gr)

Where V is the escape velocity

g is the acceleration due to gravity

r is the radius of the earth.

With the above equation, we can obtain the answer to the question as follow:

V = √(2gr)

V(5r) = √(2g5r)

Next, we'll obtained the ratio of V(5r) to V as shown below

V(5r) : V => V(5r)/V

V(5r)/V = √(2g5r) / √(2gr)

V(5r)/V = √5

Cross multiply

V(5r) = V√5

From the above illustration, we can see that when the satellite is moved to 3r, then the expression for the velocity will be V√5

3 0

3 years ago

The potential energy of a particle experiencing a certain kind of force is given by U(x) = 2x + 8 x measured in joules (J), for

masha68 [24]

Answer:

Explanation:

Given

Potential Energy of a particle is given by $U(x)=2x+\frac{8}{x}$

For minimum or maximum Potential Energy differentiate U(x) w.r.t x

$\frac{\mathrm{d} U}{\mathrm{d} x}=2-\frac{8}{x^2}$

putting $\frac{\mathrm{d} }{\mathrm{d} x}=0$

$2-\frac{8}{x^2}=0$

$x^2=\frac{8}{2}$

$x^2=4$

$x=\sqrt{4}=\pm 2$

To know minimum value check $\frac{\mathrm{d^2} U}{\mathrm{d} x^2}$

at x=-2

$\frac{\mathrm{d^2} U}{\mathrm{d} x^2}=\frac{16}{x^3}=-\frac{16}{8}=-2$

so at x=-2 potential energy is minimum $U=-8\ J$

8 0

3 years ago

X-rays generally have _____ energy and a _____ frequency.

Nonamiya [84]

Answer: D

X-rays generally have high energy and a high frequency.

Explanation:

High-energy X-rays or HEX-rays are very hard X-rays, with typical energies of 80–1000 keV (1 MeV), about one order of magnitude higher than conventional X-rays (and well into gamma-ray energies over 120 keV).

Radio waves have much longer wavelengths and lower frequencies than do visible light waves. In contrast, X-rays have much shorter wavelengths and higher frequencies. Likewise, red light has a longer wavelength than blue light. We can also think of light as consisting of particles or packets on information that we call photons.

3 0

3 years ago

A wave is described by the expression y(x, t)= (3.0 cm) × cos(1.5x − 50t), where x is in m and t is in s.

Nadya [2.5K]

Answer:

Speed = 209.5m/s

Direction = Positive x direction

Explanation:

The general wave equation expressing the displacement of a wave travelling in the positive x-direction is written as follows;

y(x, t) = y x cos(2 $\pi$ kx - 2 $\pi$ ft) --------------------(i)

Where;

y(x, t) = the position of the wave at time t

y = the amplitude of the wave,

k = the wave number

f = frequency of the wave

Given;

y(x, t)= (3.0 cm) × cos(1.5x − 50t) -------------------(ii)

Comparing equations(i) and (ii)

=> y = amplitude

=> y = 3.0cm

=> y = 0.03m

Also,

=> 2 $\pi$ kx = 1.5x

=> k = $\frac{0.75}{\pi }$

=> wave number (k) = $\frac{0.75}{\pi }$

Also,

=> 50t = 2 $\pi$ ft

=> f = frequency

=> f = $\frac{25}{\pi }$ Hz

But,

=> wavelength (λ) = $\frac{2\pi }{k}$ ------- (iii)

Substituting for k = $\frac{0.75}{\pi }$ in equation (iii)

=> λ = (2 $\pi$ ) ÷ $\frac{0.75}{\pi }$

=> λ = (2 $\pi$ ) x $\frac{\pi }{0.75}$ (where $\pi$ = 3.142)

=> λ = 26.33m

(a) To calculate the speed (v) of the wave, we use the formula;

v = f x λ

where f = $\frac{25}{\pi }$ and λ = 26.33

=> v = $\frac{25}{\pi }$ x 26.33

=> v = 209.5m/s

(b) To get the direction in which the wave is travelling, a quick look at the sign between the x and t terms (1.5x - 50t) in the given equation (ii) will suffice.

<em>A negative sign shows that the wave is travelling in the +x direction</em>

<em>A positive sign shows that the wave is travelling in the -x direction.</em>

In this case, the sign between these terms is negative. This shows that the wave is travelling in the positive x direction.

8 0

3 years ago

I NEED AN ANSWER ASAP!!!!!!!!!!!! PLEASE HELP ME!!!!!!!!!!!!!!! A 1.5m wire carries a 9 A current when a potential difference of

erik [133]

Resistance = (voltage) / (current)

= (58 v) / (9 A)

= 6.44 ohms

(The number would not be an answer without units.)

4 0

4 years ago