Answer:
High speed internet is typically transmitted around the world;
b. Through fiber optic cables
Explanation:
High speed internet is typically transmitted through fiber optic cables such as the Submarine Cables that makes connection through two cables that connects USA to Europe over the Atlantic Ocean, and the Middle East to Europe Terrestrial Cable Systems (MEETS) which is a cable network of 1,400 km and is being built to have an initial capacity of 200 Gbps
Other example of fiber optic cable assisted internet broadband transmission are the Diverse Route for European and Asian Markets (DREAM) terrestrial cable that connects Germany, Kazakhstan, Russia, and China, TEA NEXT that provides connection between borders on the East and West of Russia and Euro-Russia-Mongolia-China (ERMC) terrestrial cable
Answer:
Solidification time is 2.78 min.
Explanation:
Chvorinov's rule states that the solidification time is directly proportional to the square of ratio of total volume to the total surface area of the cast.
Step1
Given:
Chvorinov's rule constant is 4 min/cm².
Length of the rectangular cast is 30 cm.
Width of the rectangular cast is 15 cm.
Thickness of the rectangular cast is 20 mm or 2 cm.
Calculation:
Step2
Volume of the cast is calculated as follows:
![V=l\times b\times t](https://tex.z-dn.net/?f=V%3Dl%5Ctimes%20b%5Ctimes%20t)
![V=30\times15\times2](https://tex.z-dn.net/?f=V%3D30%5Ctimes15%5Ctimes2)
V = 900 cm³.
Step3
Total surface area is calculated as follows:
A=2(lb+bt+tl)
![A=2(30\times15+15\times2+2\times30)](https://tex.z-dn.net/?f=A%3D2%2830%5Ctimes15%2B15%5Ctimes2%2B2%5Ctimes30%29)
A=1080 cm².
Step4
Time of solidification is calculated as follows:
![t=K(\frac{V}{A})^{2}](https://tex.z-dn.net/?f=t%3DK%28%5Cfrac%7BV%7D%7BA%7D%29%5E%7B2%7D)
![t=4(\frac{900}{1080})^{2}](https://tex.z-dn.net/?f=t%3D4%28%5Cfrac%7B900%7D%7B1080%7D%29%5E%7B2%7D)
t = 2.78 min.
Thus, solidification time is 2.78 min.
Answer:
(a) Frequency induced voltage of motor is 120 Hz
(b) The speed at which the machine will produce an average torque is 240π rad/s. Maximum Torque is 1.0 Nm
Explanation:
Density of cylinder = 11.4g/cm3
Volume of cylinder = h r2
but height (h) = 5.50cm
radius(r) = d/2 = 2.50/2 = 1.25cm
Hence Volume = 5.50 × (1.25)2
= 8.6cm3
Density = Mass/Volume
Hence Mass of the cylinder =
Density × Volume
Mass = 11.4 × 8.6 = 94.04g.