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2 years ago

Why are satellites placed into orbit at least 150 km above Earth’s surface?

Physics

2 answers:

il63 [147K]2 years ago

5 0

Answer:

Satellites are placed into orbit at least 150km above Earth's surface to ensure that they remain above the atmosphere.

The velocity required to keep a balance between the inertia of the motion of the satellite and the earth's gravitational pull, which is called the orbital velocity, essentially depends on its distance above the surface of the Earth. The higher this distance, the longer the satellite will stay in the orbit. Otherwise it might run into the atmosphere and could get burnt up there.

hodyreva [135]2 years ago

4 0

Satellites are placed into orbit at least 150 km above Earth's surface to be above the atmosphere.

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In a perfectly elastic collision between two perfectly rigid objects

ipn [44]

Both the total momentum and the total kinetic energy are conserved

Explanation:

- In a collision between two or more objects, if there are no external forces acting on the system (isolated system), the total momentum of the objects is always conserved. This is called principle of conservation of momentum, and can be written as follows:

$mu+MU = mv+MV$

where

m, M are the masses of the two objects

u, U are the initial velocities of the two objects

v, V are the final velocities of the two objects

- The total kinetic energy, however, is not always conserved. In fact, we have two types of collision:

1) In a perfectly elastic collision, the total kinetic energy of the objects is conserved. This means that we can write the following equation:

$\frac{1}{2}mu^2 + \frac{1}{2}MU^2 = \frac{1}{2}mv^2+\frac{1}{2}MV^2$

2) In an inelastic collision, the total kinetic energy of the object is NOT conserved. This means that part of the total kinetic energy is "lost", converted into other forms of energy (mainly thermal energy, due to the presence of frictional forces within the system). The most extreme case is called perfectly inelastic collision, in which the two objects stick together after the collision, and there is the maximum loss of kinetic energy.

Learn more about collisions:

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brainly.com/question/6439920

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7 0

3 years ago

An object has a variable volume and shape before it changes state. After the

monitta

A : Solid to liquid

Solids have a variable volume and shape before it changed. Liquids can change in shape but have a fixed volume ( ex: water holding it’s shape in the cup until the person spills it )

3 0

3 years ago

Read 2 more answers

What is the terminal velocity of a penny falls off a skyscraper

Naya [18.7K]

The penny will reach terminal velocity at 50 ft. Then it will travel 25 mph till it reaches ground.

7 0

3 years ago

According to the Big Bang theory, when the universe first formed, the temperature was extremely hot. As it began to cool, proton

alex41 [277]

hydrogen would be the first Element

5 0

3 years ago

A 14.0 gauge copper wire of diameter 1.628 mmcarries a current of 14.0 mA. Part A: What is the potential difference across a 2.1

FrozenT [24]

Answer:

for copper potential difference is 2.4871 × $10^{-4}$ V

for silver potential difference is 2.1256 × $10^{-4}$ V

Explanation:

given data

diameter D = 1.628 mm = 0.001628 m

current = 14.0 mA = 0.0140 A

length L = 2.15 m

to find out

potential difference

solution

we consider here

resistivity of silver = 1.47 × $10^{-8}$ ohm-m

resistivity of copper = 1.72 × $10^{-8}$ ohm-m

so we apply here resistance formula that is

Resistance = ρ × L / A ...............1

so here area A = πr² = π(0.001628 /2)² = 2.0816 × $10^{-6}$ m²

for copper Resistance = ρ × L / A

Resistance = 1.72 × $10^{-8}$ × 2.15 / 2.0816 × $10^{-6}$

Resistance = 1.7765 × $10^{-2}$ ohm

for silver Resistance = ρ × L / A

Resistance = 1.47 × $10^{-8}$ × 2.15 / 2.0816 × $10^{-6}$

Resistance = 1.5183 × $10^{-2}$ ohm

potential difference is calculated as

for copper potential difference = current × resistance

potential difference = 0.0140 ×1.7765 × $10^{-2}$

potential difference = 2.4871 × $10^{-4}$ V

for silver potential difference = current × resistance

potential difference = 0.0140 × 1.5183 × $10^{-2}$

potential difference = 2.1256 × $10^{-4}$ V

7 0

2 years ago