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2 years ago

A description of a phenomenon

Physics

2 answers:

Shalnov [3]2 years ago

6 0

Answer:

A phenomenon is an extraordinary occurrence or circumstance. ... Like many words with Greek roots, phenomenon started out as a science term. Scientists used it (and still do) to describe any event or fact that could be observed, amazing or not.

Explanation:

도움이 되기를 바랍니다.... 미리 환영합니다.

natali 33 [55]2 years ago

6 0

Answer: is a extraordinary occurrence or circumstance...

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PLEASE HELPPP!! 40 POINTS! A young man exerted a force of 900 newtons for 10 seconds to push his car. However, he could not get

Dmitrij [34]

No work is done because the object needs to be moved. The formula for work is Work = Force x Distance.

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3 years ago

Infrared light of wavelength 2.5 µm illuminates a 0.20-mm-diameter hole. What is the angle of the first dark fringe in radians?

stepan [7]

Answer:

Θ=0.01525 rad

Θ=0.87°

Explanation:

Given data

wavelength λ=2.5 µm =2.5×10⁻⁶m

Diameter d=0.20 mm =0.20×10⁻³m

To find

Angle Θ in radians and degree

Solution

Circular apertures have first dark fringe at

Θ=(1.22λ)/d

Substitute the given values

Θ=[1.22(2.5×10⁻⁶m)]/0.20×10⁻³m

Θ=0.01525 rad

Θ=0.87°

6 0

3 years ago

An atom of the element chromium has an atomic number of 24 and a mass number of 52. How many electrons are in an uncharged atom

zubka84 [21]

<span>Chromium is represented by the element Cr with an atomic number of 24 and a molar mass of 52 gram per mole. The number of protons in the Chromium atom is the atomic number, so it has 24 protons. And the protons of chromium atom is equal to the number of electrons, so 24 electrons.</span>

4 0

3 years ago

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A simple hydraulic lift is made by fitting a piston attached to a handle into a 3.0-cm diameter cylinder. The cylinder is connec

stiv31 [10]

Answer:

Approximately $3.1 \times 10^4 \; \rm N$ (assuming that the acceleration due to gravity is $g = 9.81\; \rm kg \cdot N^{-1}$ .)

Explanation:

Let $A_1$ denote the first piston's contact area with the fluid. Let $A_2$ denote the second piston's contact area with the fluid.

Similarly, let $F_1$ and $F_2$ denote the size of the force on the two pistons. Since the person is placing all her weight on the first piston:

$F_1 = W = m \cdot g = 50\; \rm kg \times 9.81 \; \rm kg \cdot N^{-1} =495\; \rm N$ .

Since both pistons fit into cylinders, the two contact surfaces must be circles. Keep in mind that the area of a square is equal to $\pi$ times its radius, squared:

$\displaystyle A_1 = \pi \times \left(\frac{1}{2} \times 3.0\right)^2 = 2.25\, \pi\;\rm cm^{2}$ .
$\displaystyle A_2 = \pi \times \left(\frac{1}{2} \times 24\right)^2 = 144\, \pi\;\rm cm^{2}$ .

By Pascal's Law, the pressure on the two pistons should be the same. Pressure is the size of normal force per unit area:

$\displaystyle P = \frac{F}{A}$ .

For the pressures on the two pistons to match:

$\displaystyle \frac{F_1}{A_1} = \frac{F_2}{A_2}$ .

$F_1$ , $A_1$ , and $A_2$ have all been found. The question is asking for $F_2$ . Rearrange this equation to obtain:

$\displaystyle F_2 = \frac{F_1}{A_1} \cdot A_2 = F_1 \cdot \frac{A_2}{A_1}$ .

Evaluate this expression to obtain the value of $F_2$ , which represents the force on the piston with the larger diameter:

$\begin{aligned}F_2 &= F_1 \cdot \frac{A_2}{A_1} \\ &= 495\; \rm N \times \frac{2.25\, \pi\; \rm cm^2}{144\, \pi \; \rm cm^2} \approx 3.1 \times 10^4\; \rm N\end{aligned}$ .

6 0

3 years ago

Sort the statements based on whether they are correct or incorrect. All waves have the same wavelength. Radio telescopes give us

shutvik [7]

All waves have the same wavelength.

FALSE

All waves may not be of same frequency because all waves are of different energy levels and energy depends on the frequency which is different.

Radio telescopes give us information about the birthplace of a star.

FALSE

Radio telescope is an astronomical instrument consisting of a radio receiver and an antenna system that is used to detect radio-frequency radiation emitted by extraterrestrial sources.

If the wavelength of a wave increases, its frequency also increases.

FALSE

relation between frequency and wavelength is given as

$\nu = \frac{c}{\lambda}$

so they are inversely related to each other and hence if wavelength is increased then frequency must have to decrease.

Visible light is a kind of electromagnetic wave.

TRUE

All visible light is a part of electromagnetic waves.

All objects emit electromagnetic waves.

TRUE

Due to thermal vibrations all objects radiate electromagnetic waves of different frequencies.

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3 years ago

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