Answer:
Explanation:
For resistance of a wire , the formula is as follows
R = ρ L / S
where ρ is specific resistance , L is length and S is cross sectional area
Given L = 14 000 m ,
S = 4.8 x 10⁻⁴ m²
specific resistance of aluminum = 2.8 x 10⁻⁸ ohm-meter
Putting the values in the formula
R = 2.8 x 10⁻⁸ x 14 x 10³ / (4.8 x 10⁻⁴ )
R = 0.8167 ohm .
= .82 ohm .
0.304 cm I think - let me check
f = frequency of the sound wave = 680 hertz
λ = wavelength of the sound wave = 0.5 meters
v = speed of sound wave
we know that , speed of sound wave is given as
speed of sound wave = frequency of sound wave x wavelength of sound wave
v = f λ
inserting the above values in the formula above
v = (680 hertz) (0.5 meters)
v = 340 meter/second
hence the speed of sound wave comes out to be 340 meter/second
Answer:255.255.255.224
Explanation:
/20 has a subnet mask of 255.255.240.0
We have 20 on bits for the network and 16 off bits for the host. Since the designer wants 20 to 30 hosts in each subnet we will be having 5 off bits for the host. Therefore we will be having a /27..
Which will be 255.255.255.224
