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3 years ago

Why don't satellites in orbit fall to the ground? Why they don't fly off into space?

2 answers:

6 0

-- The satellite IS falling, but it never reaches the ground because
it's also moving "sideways" ... in the direction of the orbit ... and
because the Earth is shaped like a sphere.

The satellite is moving sideways fast enough so that by the time
it falls 1 foot, the Earth's surface has curved down away from it
1 foot, so it's still the same distance from the Earth's surface.

-- A satellite doesn't fly off into space for the same reason that
a yo-yo doing "around the world" on the end of a string doesn't
fly off ... It's being held onto the circle by the tension in the string,
a force that keeps pulling it toward the center of the circle.

There's a force on the satellite too, that keeps pulling it toward
the center of the Earth. It's the gravitational force between the
Earth and the satellite.

The satellite doesn't fly off into space for the same reason that
YOU don't do that either.

Molodets [167]3 years ago

4 0

They are held in earths gravity.

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What distinguishes mass from weight?

Hunter-Best [27]

Answer:

The answer is A.) Mass is a measure of the amount of matter in an object, while weight is a measure of the force of gravity on the object.

Explanation:

Your weight would change if you went to the moon because the gravitational pull is different but your mass would stay the same because the amount of matter in you wouldnt change.

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3 years ago

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Describe the difference between the currents that exist in the wires leading to a capacitor when these wires are connected to (a

krek1111 [17]

Answer:

Explanation: In DC circuit, the current will flow for a short time, which is required to charge the capacitor. Once you switch it on, it spikes and the gradually decreases to almost zero (0) as the capacitor becomes fully charged.

In an AC circuit, the circuit acts as if the current is flowing throw the plates whereas is not actually flowing. The circuit acts like the AC is flowing through the capacitor.

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3 years ago

Hydrogen/hydronium ion concentration

Valentin [98]

Answer:

Pure water is considered to neutral and the hydronium ion concentration is 1.0 x 10-7 mol/L which is equal to the hydroxide ion concentration. So the pH is the -log of the [hydronium ion].

Explanation:

Pure water is considered to neutral and the hydronium ion concentration is 1.0 x 10-7 mol/L which is equal to the hydroxide ion concentration. So the pH is the -log of the [hydronium ion].

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4 years ago

A copper wire has a radius of 3.5 mm. When forces of a certain equal magnitude but opposite directions are applied to the ends o

denpristay [2]

Answer:

The tensile stress on the wire is 550 MPa.

Explanation:

Given;

Radius of copper wire, R = 3.5 mm

extension of the copper wire, e = 5.0×10⁻³ L

L is the original length of the copper wire,

Young's modulus for copper, Y = 11×10¹⁰Pa.

Young's modulus, Y is given as the ratio of tensile stress to tensile strain, measured in the same unit as Young's modulus.

$Y =\frac{Tensile \ stress}{Tensile \ strain} \\\\Tensile \ stress = Y*Tensile \ strain\\\\But, Tensile \ strain = \frac{extension}{original \ Length} = \frac{5.0*10^{-3} L}{L} = 5.0*10^{-3}\\\\Tensile \ stress = 11*10^{10} *5.0*10^{-3} \ = 550*10^6 \ Pa$

Therefore, the tensile stress on the wire is 550 MPa.

8 0

3 years ago

A group of air particles in a balloon are spread far apart and moving rapidly around inside the balloon. The balloon is placed i

Slav-nsk [51]

Answer:

1) The balloon will shrink

2) The balloon will grow bigger and regain its shape

Explanation:

By the kinetic theory of gases, we have;

$v_{rms} = \sqrt{\dfrac{3 \cdot R \cdot T}{MW} }$

$P = \dfrac{n \cdot MW \cdot vrms^2}{3 \cdot V}$

Where;

$v_{rms}$ = RMS Speed

R = The universal gas constant

T = The temperature

MW = The Molecular weight

n = The number of moles

V = The volume

P = The pressure

1) When the balloon is placed in the refrigerator for minutes, the temperature inside the balloon will drop and RMS speed will reduce, however due to the elastic wall of the balloon, the pressure will remain the same therefore the volume will reduce and the balloon will shrink

2) When the balloon is placed on the kitchen counter, the temperature inside the balloon will rise leading to the increase in the RMS speed which will raise the pressure effect on the wall of the balloon as the balloon is made of elastic material, as the pressure rises, the wall expands to keep the pressure constant and the volume occupied by the air particles will increase, the balloon will grow bigger and regain its shape.

6 0

3 years ago