Answer:
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Explanation:
The atmosphere is a mixture of nitrogen (78%), oxygen (21%), and other gases (1%) that surrounds Earth. High above the planet, the atmosphere becomes thinner until it gradually reaches space. The atmosphere is an important part of what makes Earth livable.
The beginning of the universe is from the big bang which is a massive explosion.
The Big Bang is the moment when the universe began 13.8 billion years ago with the explosion of a small, dense fireball. However, what caused the explosion in the first place remains a mystery.
A Big Bang event is a physical theory that explains how the universe expands from a dense and hot initial state. Various cosmological models of the Big Bang explain the evolution of the observable universe from the earliest known epochs to later large-scale forms.
In 1929, Edwin Hubble provided the first observational evidence that the age of the universe is finite. Using the largest telescope of its time, he discovered that the farther away a galaxy is from us, the more it appears that the space is expanding from us in all directions.
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The acceleration of the car and the time required to reach this speed will be 8 m/s² and 10 sec.
<h3>What is acceleration?</h3>
The rate of velocity change concerning time is known as acceleration.
Given data;
Initial velocity, u=0 m/s
Final velocity, v= 80 m/sec
Distance travelled,s =900m
From Newton's third equation of motion;
v²=u²+2as
a =(v²-u²)/2s
Substitute the given values;
a = (80²-0)/2 ×900
a = 6400/1800
a=8 m/s²
The time required to reach this speed is found in Newton's first equation of motion as;
v = u+at
Substitute the given values;
80 = 0 + 8t
t=80/8
t = 10 sec
Hence, the acceleration of the car and the time required to reach this speed will be 8 m/s² and 10 sec.
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Answer:
A. the satellite cools off by radiation.
Explanation:
First of all, let's define the three methods of heat transfer:
- Conduction: conduction occurs when two objects (or two substances) are in contact with each other - the heat is transferred by the warmer object to the colder object by collisions between the particles of the two objects
- Convection: convection occurs when a fluid is heated by an external source of heat - the heat transferred by the source produce a movement of the particles in the fluid (the warmer part becomes less dense and rises, being replaced by the colder part of fluid which sinks, producing a convective current)
- Radiation: radiation occurs when an object emits electromagnetic radiation, which carries energy and heat. Every object emits electromagnetic radiation, so every object emits heat by radiation.
While the first two methods (conduction and convection) occur only if there is a medium involved, radiation can also occur in a vacuum, so also in empty space. Therefore, the satellite in space cools off only by radiation, since conduction and convection are not possible.
Answer:
Equivalent resistance: 13.589 Ω
Explanation:
R series = R1 + R2 + R3 ...
Find the equivalent resistance of the right branch of the circuit: