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vovangra [49]
3 years ago
8

Why do we use microwaves to communicate berween earth and satellites

Physics
2 answers:
nlexa [21]3 years ago
7 0
It’s frequency is high and microwaves can pass through the atmosphere of the Earth.
valentinak56 [21]3 years ago
3 0
That is the main reason why microwaves are chosen for satellite communication. Its frequency is high and microwaves can pass through the atmosphere of Earth to reach higher orbit satellites. ... Radio waves (other than microwaves )get affected by ionosphere and hence isn't used.
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A hoop (I = MR2) of mass 3 kg and radius 1.1 m is rolling at a center-of-mass speed of 11 m/s. An external force does 842 J of w
Scilla [17]

Answer:

v_f = 20 m/s

Explanation:

Since the hoop is rolling on the floor so its total kinetic energy is given as

KE = \frac{1}{2}mv^2 + \frac{1}{2} I\omega^2

now for pure rolling condition we will have

v = R\omega

also we have

I = mR^2

now we will have

KE = \frac{1}{2}mv^2 + \frac{1}{2}(mR^2)\frac{v^2}{R^2}

KE = mv^2

now by work energy theorem we can say

W = KE_f - KE_i

842 J = mv_f^2 - mv_i^2

842 = 3(v_f^2) - 3\times 11^2

now solve for final speed

v_f = 20 m/s

3 0
3 years ago
Do you think toxicity is a qualitative or quantitative property? explain
Tomtit [17]

Answer:

<u>Toxicity is a quantitative property</u>

Explanation:

  • Qualitative property of a object cannot be measured it can just be observed
  • Quantitative property of a substance  can be measured and be assigned a numerical value .
  • <u>The toxicity level of a substance can be measured and be assigned a numeral value </u>

<u />

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3 0
3 years ago
A roller coaster car travels up and down the hills of its track. Neglecting
Volgvan

Answer:

option D is the correct option

Must always remain constant

Explanation:

According to their law of conservation of energy :it states that in a closed system,the total mechanical energy is always constant although energy may change from one form to another. e. g from potential energy to kinetic energy

7 0
3 years ago
What is one behavior that a plant has that a human would be suprised by
statuscvo [17]
Growing and being able to pollen

3 0
3 years ago
When the material in the mantle cools off near the surface then sinks
MatroZZZ [7]
I’m guessing convection currents since you mention mantle and core, reminds me of heat
5 0
3 years ago
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