1). Systems at higher frequencies can carry more information
(data, pictures, channels, etc.) than at lower frequencies.
2). The "dish" antennas used for satellite communication, both on
the ground and on the satellite, have more gain at higher frequencies
than they have at lower ones.
3). Radio waves at frequencies lower than VHF reflect off of the
ionized layers of the atmosphere and return to Earth. They never
get out to where the satellites are.
4). All of the communication spectrum (frequencies) below VHF
were already being used for other services by the time satellite
communication started (in the 1960's).
The rest of it is used up as unwanted energy or wasted energy in forms of:
.heat
.noise
Answer:
(a) 0.017m/s^2
(b) 17/100,000
(c) 0.17m, 0.558ft
Explanation:
(a) speed = 60mph = 60m/1h × 1h/3600s = 0.017m/s, time = 10s
Acceleration (a) = speed ÷ time = 0.017m/s ÷ 10s = 0.0017m/s^2
(b) g = 9.8m/s^2, a = 0.0017m/s^2
a/g = 0.0017/9.8 = 0.00017 = 17/100,000
(c) Distance = speed × time = 0.017m/s × 10s = 0.17m
Distance in foot = 0.17 × 3.2808ft = 0.558ft
Answer:
acceleration=(v final-vinitial)/time
a=(vf-vi)/t
2=(30-10)/t
2=20/t
t=20/2=10 seconds
distance=v0t+at²/2
d=10 x 10+ 2x 10²/2=100+100= 200 m
Explanation:
Answer:
Option 1
It provides evidence of universe expansion
Explanation:
The Big Bang Theory actually explains the universe as originating from a single point, which expanded as billions of years went by.
The background radiation supports this theory in the sense that if the universe is expanding, this means that the universe is cooling and continuously losing heat, which results in background radiation
