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Nostrana [21]
3 years ago
14

Why does a ball accelerate as it rolls down a hill?

Physics
2 answers:
Anika [276]3 years ago
6 0
The ball accelerates because of gravity.
Allushta [10]3 years ago
5 0
Because there is a 'net force' on it.  That means that all the different
forces on it do NOT all cancel out.  Whenever there is a net force on
an object ... not zero force ... the object accelerates.  (That means that
either its speed or its direction changes.)  We've known this for about
300 years now.
The main force on the ball is the force of gravity.
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A TV satellite dish is designed to receive radio waves of wavelength
Verizon [17]

Answer:

4.7 GHz

Explanation:

Applying,

v = λf................. Equation 1

Where v = velocity of the radio wave, λ = wavelength, f = frequency

make f the subject of the equation

f = v/λ.............. Equation 2

Note: A radio wave is an electromagnetic wave, as such it moves with a velocity of 3.00 x 10⁸ m/s

From the question,

Given: λ = 0.0644 meters

Constant: v = <em>3.00 x 10⁸ m/s</em>

Substitute these values into equation 2

f = (3.00 x 10⁸)/0.0644

f = 4.66×10⁹ Hz

f = 4.7 GHz

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2 years ago
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OlgaM077 [116]
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Does the nucleus of an atom have a positive or negative charge?
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A.
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3 years ago
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Question 1 (1 point)
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Why alloys<br> are useful to someone with no science<br> knowledge<br><br> Will give Brainiest
Andreyy89

Answer:

The key idea behind the synthesis, processing and application of alloys consist in combining desire qualities from each mineral component in the form of a material.

Explanation:

The key idea behind the synthesis, processing and application of alloys consist in combining desire qualities from each mineral component in the form of a material. For example, steel is the combination of iron, which is ductile but prone to rusting in wet environments, and carbon, which offers high hardness and additional resistence to rusting in wet environments, but is fragile. Hence, steel is more resistant to rusting, ductile as iron and more resistant than iron.

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