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2 years ago

What technique is used by scientists to determine which of several explanations is the best explanation

Physics

1 answer:

jok3333 [9.3K]2 years ago

4 0

Answer:

When conducting research, scientists use the scientific method to collect measurable, empirical evidence in an experiment related to a hypothesis (often in the form of an if/then statement), the results aiming to support or contradict a theory.

I HOPE ITS RIGHT

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What happens when a negatively charged object A is brought near a neutral object B?

Eva8 [605]

<span>Object B stays neutral but becomes polarized.

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2 years ago

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A rocket travels vertically at a speed of 800 km/hr. the rocket is tracked through a telescope by an observer located 13 km from

xz_007 [3.2K]

The rocket's altitude $y$ at time $t$ is

$y(t)=\left(800\dfrac{\rm km}{\rm h}\right)t$

so that after $t=3\,\mathrm{min}$ , it will have traveled

$y=\left(800\dfrac{\rm km}{\rm h}\right)(3\,\mathrm{min})=40\,\mathrm{km}$

The angle of elevation $\theta$ at time $t$ is such that

$\tan\theta=\dfrac{y(t)}{13\,\rm km}$

At the moment when $y(t)=30\,\mathrm{km}$ , this angle is

$\tan\theta=\dfrac{30\,\rm km}{13\,\rm km}\implies\theta\approx66.57^\circ$

Differentiating both sides of the equation above gives

$\sec^2\theta\dfrac{\mathrm d\theta}{\mathrm dt}=\dfrac1{13\,\rm km}\dfrac{\mathrm dy(t)}{\mathrm dt}$

and substituting the angle $\theta$ found above, and $\dfrac{\mathrm dy(t)}{\mathrm dt}=800\dfrac{\rm km}{\rm h}$ , we get

$\sec^2\theta66.57^\circ\dfrac{\mathrm d\theta}{\mathrm dt}=\dfrac1{13\,\mathrm km}\left(800\dfrac{\rm km}{\rm h}\right)$

$\implies\boxed{\dfrac{\mathrm d\theta}{\mathrm dt}\approx9.73\dfrac{\rm rad}{\rm h}}$

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2 years ago

One primary purpose of the European Union is to

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The primary purpose of the European Union is to allow more trades between countries.
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2 years ago

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Which pair of atoms will form a covalent molecule?

lyudmila [28]

Covalent molecules are molecules that have a sharing of electrons occurring between them, and this most commonly occurs between two non- metals. Therefore, 1 atom of oxygen and 2 atoms of hydrogen will form a covalent bond and this molecule is known as water

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2 years ago

If two 1000kg cars have a gravitational force of 1.067x10^-5 N towards each other, how far apart are they?

Taya2010 [7]

Answer:

6.25m

Explanation:

Given parameters:

Masses of the car = 1000kg

Gravitational force = 1.067 x 10⁻⁵N

Unknown:

Distance between them = ?

Solution:

To solve this problem, we use the expression below from the universal gravitational law;

Fg = $\frac{G x mass 1 x mass 2}{distance^{2} }$

G = 6.67 x 10⁻¹¹

1.067 x 10⁻⁵ = $\frac{6.67 x 10^{-11} x 1000 x 1000 }{d^{2} }$

d = 6.25m

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2 years ago