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3 years ago

What instrument records earthquake waves? *

Physics

1 answer:

slavikrds [6]3 years ago

3 0

Answer:

Seismographs

Explanation:

Seismographs. During an earthquake, vibrations caused by the breakage of rock along a fault zone radiate outward from the point of rupture. The instrument used to record and measure these vibrations is called a seismograph

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An aluminium bar 600mm long, with diameter 40mm, has a hole drilled in the center of the bar. The hole is 30mm in diameter and i

ASHA 777 [7]

Answer:

$\delta = 0.385\,m$ (Compression)

Explanation:

The aluminium bar is experimenting a compression due to an axial force, that is, a force exerted on the bar in its axial direction. (See attachment for further details) Under the assumption of small strain, the deformation experimented by the bar is equal to:

$\delta = \frac{P\cdot L}{A \cdot E}$

Where:

$P$ - Load experimented by the bar, measured in newtons.

$L$ - Length of the bar, measured in meters.

$A$ - Cross section area of the bar, measured in square meters.

$E$ - Elasticity module, also known as Young's Module, measured in pascals, that is, newtons per square meter.

The cross section area of the bar is now computed: ( $D_{o} = 0.04\,m$ , $D_{i} = 0.03\,m$ )

$A = \frac{\pi}{4}\cdot (D_{o}^{2}-D_{i}^{2})$

Where:

$D_{o}$ - Outer diameter, measured in meters.

$D_{i}$ - Inner diameter, measured in meters.

$A = \frac{\pi}{4}\cdot [(0.04\,m)^{2}-(0.03\,m)^{2}]$

$A = 5.498 \times 10^{-4}\,m^{2}$

The total contraction of the bar due to compresive load is: ( $P = -180\times 10^{3}\,N$ , $L = 0.1\,m$ , $E = 85\times 10^{9}\,Pa$ , $A = 5.498 \times 10^{-4}\,m^{2}$ ) (Note: The negative sign in the load input means the existence of compressive load)

$\delta = \frac{(-180\times 10^{3}\,N)\cdot (0.1\,m)}{(5.498\times 10^{-4}\,m^{2})\cdot (85\times 10^{9}\,Pa)}$

$\delta = -3.852\times 10^{-4}\,m$

$\delta = -0.385\,mm$

$\delta = 0.385\,m$ (Compression)

7 0

3 years ago

Three force vectors are added together. One has a magnitude of 9 N, the second one a magnitude of 18 N, and the third a magnitud

fgiga [73]

Answer:

true I, II and III

Explanation:

The force is a vector quantity, by local it must be added as vectors, we can suppose several cases

.i) the vectors are colonial, so their sum is maximum

F_max = 9 + 15 + 18

F_max = 42 N

This is the maximum value

ii) the anti-parallel vectors giving a minimum value

F_min = 15 + 9-18

F_min = 6 N

iii) the vectors have angles between them, so we must use the Pythagorean theorem to find the resultant, which is an intermediate value between the two extreme values found.

Let's take a look at each statement

I) True This is the maximum value of the force if all the vectors are colonial

II) True The minimum value is 6 N, so zero can never be reached

III) True these bores are between the maximum values and the direction of the vectors, lower values occur when the forces have angular between them

IV) False. Force can never reach zero

V) False. Several of the above are conclusions of the exercise

7 0

3 years ago

Someone please help me it’s due today

stellarik [79]

Answer:

number 3 is the 3rd one and number 2 is the 4 one and number 1 is the 2nd one

4 0

3 years ago

How does the concentration of a hydrogen ion affect the ph levels of a substance?

alex41 [277]

Acidic and basic are two extremes that describe chemicals, just like hot and cold are two extremes that describe temperature. Mixing acids and bases can cancel out their extreme effects, much like mixing hot and cold water can even out the water temperature. A substance that is neither acidic nor basic is neutral.

The character of acidic, basic and neutral is defined by the concentration of hydrogen ions [H+](mol/L). A solution with a concentration of hydrogen ions higher than 10-7mol/L is acidic, and a solution with a lower concentration is alkaline (another way to say basic). Using the formula, pH=-log[H+], a pH of 7 is neutral, a pH less than 7 is acidic, and a pH greater than 7 is basic. As one can see from this formula, ten times a given concentration of hydrogen ions means one unit lower in terms of pH value (higher acidity), and vice versa. 

Pure water is neutral, with a pH of 7.0. When chemicals are mixed with water, the mixture can become either acidic or basic. Vinegar and lemon juice are acidic substances, while laundry detergents and ammonia are basic. 

Chemicals that are very basic or very acidic are called "reactive." These chemicals can cause severe burns. Automobile battery acid is an acidic chemical that is reactive. Automobile batteries contain a stronger form of some of the same acid that is in acid rain. Household drain cleaners often contain lye, a very alkaline chemical that is reactive.

8 0

4 years ago

In the third stanza what does the Big Brother do to help manual

natima [27]

Answer:

The sandy walls seemed to collapse in on themselves

7 0

3 years ago