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3 years ago

The process of recovering valuable or useful materials from waste or scrap is called

1 answer:

4 0

The answer is A) Recycling. Recycling has to do with finding something valuable amongst trash. For example, in a dumpster, someone may just find a nice painting. Mark as brainliest :)

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An electromagnetic wave has a frequency of 6.0 x 10^18 Hz. What is the

jonny [76]

Answer:

Wavelength = 5 * 10^{-11} meters

Explanation:

Given the following data;

Frequency = 6.0 x 10^18 Hz

Speed = 3 * 10⁸ m/s

To find the wavelength of the wave;

Mathematically, the wavelength of a wave is given by the formula;

$Wavelength = \frac {speed}{frequency}$

Substituting into the formula, we have;

$Wavelength = \frac {3 * 10^{8}}{6.0 x 10^{18}}$

Wavelength = 5 * 10^{-11} meters

8 0

3 years ago

When the hydraulic conductivity Ks = 10 mm/hr; effective matrix potential Ns = 20 mm, and rainfall intensity I = 30 mm/hr , dete

Maslowich

Answer:

$t = 0.75 \ hr = 0.75 *60 = 45 \ minutes$

Explanation:

From the question we are told that

The hydraulic conductivity is $Ks = 10\ mm/hr$

The effective matrix potential $Ns = 20 \ mm$

The intensity of rainfall is $I = 30 \ mm/hr$

The runoff rate $R = 15 \ mm/hr$

Generally the run off rate is mathematically represented as

$R = (I - Ks) t$

Here t is the amount of runoff generated

=> $15 = (30 - 10) t$

=> $t = 0.75 \ hr$

converting to minutes

$t = 0.75 \ hr = 0.75 *60 = 45 \ minutes$

3 0

3 years ago

Water enters a cylindrical tank through two pipes at rates of 250 and 100 gal/min. If the level of the water in the tank remains

tester [92]

Answer:

The total amount of water that enters the tank is:

250 gal/min + 100 gal/min = 350gal/min.

Then, if the level of the water remains constant, this means that the water leaves the tank at a rate of 350gal/min.

We know that the diameter of the pipe is 8 inches, then the area of the pipe is:

A = pi*(d/2)^2 = 3.14*(4in)^2 = 50.24in^2

now, the flow can be calculated as:

Q = v*A = (velocity*area)

if we want to write our velocity in inches per minute, then we need to write the entering flow in cubic inches:

1 gallon = 231 in^3

then:

350gal/min = (350*231) in^3/min = 80,850 in^3/min.

Then the water that leaves the tank must be the same amoun, we have:

Q = 80,850 in^3/min. = v*A = v*50.24in^2

v = (80,850in^3/min)/50.24in^2 = 1609.3 in/min.

The velocity of the flow leaving the tank is 1609.3 in/min.

3 0

4 years ago

What are radio isotopes??

RideAnS [48]

Answer:

An isotope is one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with different atomic masses and physical properties. In medicine, for example, cobalt-60 is extensively employed as a radiation source to arrest the development of cancer. Other radioactive isotopes are used as tracers for diagnostic purposes as well as in research on metabolic processes.

Hope this helps! Please let me know if you need more help, or if you think my answer is incorrect. Brainliest would be MUCH appreciated. Have a wonderful day!

7 0

2 years ago

A rock is thrown horizontally out of a window with a velocity of 20.0 m/s. If the window is 8.50m above the ground, how far

vladimir1956 [14]

The distance from the base of the building the rock will land is 26.4 m

<h3>Data obtained from the question </h3>

Horizontal velocity (u) = 20 m/s
Height (h) = 8.50 m
Distance (s) =?

<h3>Determination of the time to reach the ground </h3>

Height (h) = 8.50 m
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) =?

h = ½gt²

8.5 = ½ × 9.8 × t²

8.5 = 4.9 × t²

Divide both side by 4.9

t² = 8.5 / 4.9

Take the square root of both side

t = √(8.5 / 4.9)

t = 1.32 s

<h3>How to determine the distance </h3>

Horizontal velocity (u) = 20 m/s
Time (t) = 1.32 s
Distance (s) =?

s = ut

s = 20 × 1.32

s = 26.4 m

Learn more about motion under gravity:

brainly.com/question/22719691

6 0

3 years ago