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Natasha_Volkova [10]
3 years ago
14

Can someone help me

Mathematics
1 answer:
Rama09 [41]3 years ago
4 0

If x and y vary inversely, then xy = const.

x = 10, y = 8

xy=10\cdot8\\\\xy=80\ \ \ \ |:x\\\\\boxed{y=\dfrac{80}{x}}

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Determine the decibel values of thermal noise power (N) and thermal noise power density (No) given the following: T=292 degrees
Agata [3.3K]

Answer: d. None of the above are correct.

Step-by-step explanation: Noise is a superfluous random alteration in an eletrical signal. There are different types of noises created by different devices and process. Thermal noise is one of them. It is unavoidable because is created by the agitation of the charge carriers, due to temperature, inside an eletrical conductor at equilibrium and is present in all eletrical circuits.

The formula to find the thermal noise power (N) is: N = k_{b}.T.B, where:

k_{b} is Boltzmann constant (1.38.10^{-23}J/K);

T is temperature in Kelvin;

B is the bandwith;

Calculating the thermal noise power:

N = 1.38.10^{-23}·292·40

N = 16118.4.10^{-23} dBm

The thermal noise power [N] = 16118.4.10^{-23} dBm

Noise power density or simply Noise density (N₀) is the noise power per unit of bandwith and its SI is watts per hertz.

For thermal noise, N₀ = kT, where

<em>k </em>is the Boltzmann constant in J/K;

T is the receiver system noise temperature in K;

N₀ = 1.38.10^{-23} . 292

N₀ = 402.96.10^{-23} W/Hz

The thermal noise power density [N₀] = 402.96.10^{-23} W/Hz

7 0
3 years ago
Change to an algebraic expression <br>Half the sum of p and 9​
shepuryov [24]

Step-by-step explanation:

1/2 × (p+9) is the algebraic expression.

4 0
3 years ago
Read 2 more answers
3/4<br><br> (x−12)=12 <br><br> will mark brainlyest
Margarita [4]

Answer:

x = 24, if thats wat ur asking.

4 0
3 years ago
Read 2 more answers
17. Solve for<br> for x.<br> M<br> (10x - 45)<br> N<br> R<br> Р<br> (6x - 1)
Mashutka [201]

Looks confusing in the way you put it.

4 0
3 years ago
30 points<br> can somebody please help me<br> question below
Inessa05 [86]

Find the total number of dogs by adding each day:

Total dogs = 23

Percent of dogs: Divide the number of dogs by the total number of patients:

= 23 / 50 = 0.46 x 100 = 46%

Use the given formula to find the standard error:

Standard error = √(0.46*(1-0.46)/50) = 0.07

90%: Find Z value for 90% ( 1.645) multiply by SE:

1.645 x 0.07 = 0.115 = 0.12

Now add and subtract that value from the Percent from above:

46 + 12 = 58%

46-12 = 34%

Answer (34%, 58%)

95%: Find Z value for 95% ( 1.96) multiply by SE:

1.96 x 0.07 = 0.137 = 0.14

Now add and subtract that value from the Percent from above:

46 + 14 = 60%

46-14 = 32%

Answer (32%, 60%)

5 0
3 years ago
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