Answer:
a) it is periodic
N = (20/3)k = 20 { for K =3}
b) it is Non-Periodic.
N = ∞
c) x(n) is periodic
N = LCM ( 5, 20 )
Explanation:
We know that In Discrete time system, complex exponentials and sinusoidal signals are periodic only when ( 2π/w₀) ratio is a rational number.
then the period of the signal is given as
N = ( 2π/w₀)K
k is least integer for which N is also integer
Now, if x(n) = x1(n) + x2(n) and if x1(n) and x2(n) are periodic then x(n) will also be periodic; given N = LCM of N1 and N2
now
a) cos(2π(0.15)n)
w₀ = 2π(0.15)
Now, 2π/w₀ = 2π/2π(0.15) = 1/(0.15) = 1×20 / ( 0.15×20) = 20/3
so, it is periodic
N = (20/3)k = 20 { for K =3}
b) cos(2n);
w₀ = 2
Now, 2π/w₀ = 2π/2) = π
so, it is Non-Periodic.
N = ∞
c) cos(π0.3n) + cos(π0.4n)
x(n) = x1(n) + x2(n)
x1(n) = cos(π0.3n)
x2(n) = cos(π0.4n)
so
w₀ = π0.3
2π/w₀ = 2π/π0.3 = 2/0.3 = ( 2×10)/(0.3×10) = 20/3
∴ N1 = 20
AND
w₀ = π0.4
2π/w₀ = 2π/π0. = 2/0.4 = ( 2×10)/(0.4×10) = 20/4 = 5
∴ N² = 5
so, x(n) is periodic
N = LCM ( 5, 20 )
D. made because made is a synonym for assembled
A French drain, sometimes called a curtain drain, is a simple system with no moving parts -- gravity removes excess water from problem areas in your yard. Give gravity a chance to do its job by making sure your French drain design has the proper slope from beginning to end.
Answer:
material is aluminum by the approx value of conductivity
Explanation:
given data
length = 3 km
temperature = 20 °C
metallic wire = AWG-6
resistance = 6Ω
to find out
What material is it made of
solution
we know that AWG - 6 has a diameter of 4.1 mm
so we know resistance R is
R =
here A is area and R is resistance and l is length so find here σ
σ =
σ =
σ = 3.79 × S/m
so according to table 2-1
material is aluminum by the approx value of conductivity
Answer:
hii there
The box is any two-terminal device, such as a battery or solar cell. The two terminals are not connected to anything (an "open circuit"), so no current can flow into or out of either terminal. The red dotted line shows that this voltage is always smaller than the bandgap voltage.
hope it helps
have a nice day : )