Which of the following best describes the mobile-first strategy?
A. Creating a separate mobile website version.
B. Mobile-first is synonymous with RWD.
C. Designing for mobile users, rather than desktop or laptop users.
D. Creating a low-bandwidth or nongraphical website.
Answer: C
You might also like to view...
The relationship between the rotation of Mercury and its revolution is referred as a(n) _______________
Fill in the blank(s) with correct word
How come birds can land on overhead power lines without getting electrocuted?
a. Their feet are good insulators. b. They are saved by their small size. c. Both their feet are on the same wire, so they don't complete a circuit. d. They are just lucky, I guess.
Identical 8.0-?C point charges are positioned on the x axis at x = ±1.0 m and released from rest simultaneously. What is the kinetic energy of either of the charges after it has moved 2.0 m?
a. 84 mJ b. 54 mJ c. 96 mJ d. 63 mJ e. 48 mJ
A 2-cm-diameter bare aluminum electric power transmission line with an emissivity of 0.07 carries 500 A at 400 kV. The wire has an electrical resistivity of 1.72 micro-ohms cm2/cm at 20°C and is suspended horizontally between two towers separated by 1 km. Determine the surface temperature of the transmission line if the air temperature is 20°C. What fraction of the dissipated power is due to radiation heat transfer?
GIVEN
• An aluminum electric power transmission line suspended horizontally
• Emissivity (?) in air = 0.3
• Line diameter (D) = 2 cm = 0.02 m
• Current (I) = 500 amp
• Voltage (V) = 400 kV
• Electrical resistivity (?e) = 1.72 ? cm2/cm at 20°C
• Space between towers (L) = 1 km
• Air temperature (T?) = 20°C = 293 K
FIND
(a) Surface temperature of wire (Tw)
(b) Fraction of dissipated power due to radiation
ASSUMPTIONS
• Steady state
• The wire radiates to the surroundings which behave as a black body enclosure at T? SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/m2 K4.