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anyanavicka [17]
3 years ago
5

A stone tumbles into a mine shaft and strikes bottom after falling for 4.2 second how deep is the mine shaft

Physics
1 answer:
rjkz [21]3 years ago
5 0
4.2*9.8\\41.16

41.16 meters
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The fragment of an asteroid or any interplanetary material is known as A. METEROID
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A substance changes from a solid to a liquid at its _____.
MrRa [10]
I would say D) melting point.
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Four traveling waves are described by the following equations, where all quantities are measured in SI units and y represents th
agasfer [191]

Answer:

T_1=T_3=\dfrac{2\pi}{21}

T_2=T_4=\dfrac{2\pi}{42}

Explanation:

Wave 1, y_1=0.12\ cos(3x-21t)

Wave 2, y_2=0.15\ sin(6x+42t)

Wave 3, y_3=0.13\ cos(6x+21t)

Wave 4, y_4=-0.27\ sin(3x-42t)

The general equation of travelling wave is given by :

y=A\ cos(kx\pm \omega t)

The value of \omega will remain the same if we take phase difference into account.

For first wave,

\omega_1=21

\dfrac{2\pi }{T_1}=21

T_1=\dfrac{2\pi}{21}

For second wave,

\omega_2=42

\dfrac{2\pi }{T_2}=42

T_2=\dfrac{2\pi}{42}

For the third wave,

\omega_3=21

\dfrac{2\pi }{T_3}=21

T_3=\dfrac{2\pi}{21}

For the fourth wave,

\omega_4=42

\dfrac{2\pi }{T_4}=42

T_4=\dfrac{2\pi}{42}

It is clear from above calculations that waves 1 and 3 have same time period. Also, wave 2 and 4 have same time period. Hence, this is the required solution.

3 0
3 years ago
What's the dielectric constant of ceramic?<br> A. 1,200<br> B. 900<br> C. 80<br> D. 7.500
I am Lyosha [343]

Answer:

7.5

Explanation:

The dielectric constant of ceramics is about 7.5.

The dielectric constant of a substance is the ratio of the electric permeability of a substance to the electric permeability of free space.

Dielectric constant gives a good overview about the ability of substance to store charges compared to another.

Most substances have their electric constant and they suggest the ease by which they can store electrical energy. This is very important in developing capacitors.

6 0
3 years ago
The 225-N force is exerted on the crate towards the north and the 165-N is exerted toward the East what's the magnitude and dire
Rudik [331]

Answer:

≅279.02 N, 36° 15' from North to East

Explanation:

You can the theory of triangle of forces to find the answer.

Two forces are acting perpendicular to each other so use Pythagoras theorem to find the magnitude of the resultant  force(x).

x² = 225² + 165²

x = 279.02 N

To find the direction use the same force triangle,

Workings are in the attachment,

Download pdf
6 0
3 years ago
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