50 POINTS! BUT NO GUESSING!
PLS HELPPP Land degradation is a major issue worldwide and poses a threat to the sustainability of agriculture and the economic development of many third world countries. Which statement best describes the major cause of land degradation in these countries?
A) overuse of the fertilizers
B) silt deposits at the mouths of rivers
C) wind and wave erosion on coastal areas
D) Water erosion caused by rain and runoff in semi-arid regions
Answers
Answer:
Poverty, land shortage, increasing population
Explanation:
Related Questions
what seems to control the assembly and disassembly of intermediate filaments?
Answers
The assembly and disassembly of IFs are regulated by a variety of factors, including phosphorylation, subunit availability, pH, and ionic strength.
Intermediate filaments (IFs) are components of the cytoskeleton that control a variety of biological processes. IFs are typically less dynamic than microtubules and actin filaments, and they appear to be more stable. The assembly and disassembly of intermediate filaments are regulated by phosphorylation-dephosphorylation mechanisms.
The assembly and disassembly of intermediate filaments are controlled by a variety of factors. One of the primary determinants of IF dynamics is phosphorylation. Phosphorylation of specific residues on the IF proteins affects both the ability of the protein to form filaments and its stability once it has formed a filament.
In some cases, the presence of free subunits can promote filament formation, while in others, the formation of complexes between subunits can inhibit filament assembly. Changes in pH or ionic strength can also affect the assembly and disassembly of IFs.Intermediate filaments (IFs) are cytoskeletal structures that are typically more stable than microtubules or actin filaments.
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Which characteristics of an area could best identify the type of biome it is
Answers
Answer: average annual rainfall, average annual temperatures, types of plants and animals native to the area
Explanation: the best way you can identify a biome is by telling which animal or species are native to the certain area
A student pushes a 40-N block across the floor for a distance of 10 m. How much work was done to move the block? 4 J 40 J 400 J 4,000 J.
Answers
Answer:
\(\boxed {\boxed {\sf 400 \ J}}\)
Explanation:
Work is a force that causes the displacement of an object. It is the product of force and displacement.
\(W=Fd\)
The force is 40 Newtons and the displacement is 10 meters.
F=40 N d=10 mSubstitute the values into the formula.
\(W= 40 \ N * 10 \ m\)
Multiply.
\(W= 400 \ N*m\)
Convert the units. 1 Newton meter is equal to 1 Joule, so our answer is equal to 400 Joules.
\(W= 400 \ J\)
400 Joules of work was done to move the block.
Answer:
400 J
Explanation:
This is the correct answer for k12
In a 30cm by 25cm rectangle, a quadrant of a circle of radius 7cm has been cut away from each corner. What is the perimeter of the part left?
Answers
Answer: 98cm
Explanation:
Dimension of rectangle = 30cm by 25cm
Length(l) = 30cm
Width(w) = 25cm
Perimeter of a rectangle = 2(l + w)
Quadrant of circle cut away of each side of the rectangle :
Radius = 7 cm =
That is, the dimension of the triangle reduces by 2 * 7 = 14cm
New length = 30 - 14 = 16cm
New width = 25 - 14 = 11cm
The four corners =( 4 × 2πr ) / 4
2πr = 2 × 22/7 × 7 = 44cm
Perimeter = 2(16cm + 11cm)
= 2(27cm)
Perimeter = 54cm + 44 = 98cm
the process by which plastic deformation is produced by dislocation motion is called ________.
Answers
The process by which plastic deformation is produced by dislocation motion is called slip deformation.
When applied stress exceeds the elastic limit or yield stress, the deformation of the material body occurs. This is due to the result of a slip or dislocation mechanism at the atomic level. Plastic deformation in a metal has two prominent mechanisms, and they are. When we apply a shear stress on an object in a particular direction to change its shape or anything that we cam do. the shear stress generate a strain on the object and changes its shape to the extent that we can do by the force. the shape is changed to the extent by the force applied on the part of it and we can take a look into it. A prominent mechanism of deformation in metal is slip. By this particular information we can firmly conclude that the process by which plastic deformation is produced by dislocation motion is called slip deformation.
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Smaller the surface area greater the gravitational force and vice–versa yes or no? justify the statement.
Answers
Answer:
It is true that Smaller the surface area greater the gravitational force and vice versa
Explanation:
The gravitational force depends on the distance between the two objects
F=GMm/r2
where G = gravitational constant
M = mass of one object
m = mass of second object
r is the distance between the two objects
Gravitational force is inversely proportional to the square of the distance between two objects. Hence, it can be said the Gravitational force is inversely proportional to the area and hence as the area increases gravitational force will decrease or vice versa
Why does fulcrum placement matter for how a lever works?
Answers
Answer:
The mechanical advantage of using a lever is affected by the distance between the effort and the fulcrum and by the placement of the load. ... When the fulcrum is centered between the load and the lift, the amount of effort exerted to push down on the lever equals the amount of the load being lifted on the other end.
HELP PLS
HELP PLS
HELP PLS
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HELP PLS
HELP PLS
HELP PLS
HELP PLS
Answers
Explanation:
Refer the explanation in the picture
What conditions can cause hurricanes to change direction?
need now please
Answers
According to the research, the correct answer is that higher latitudes are conditions that can cause hurricanes to change direction.
What are hurricanes?It is a meteorological phenomenon that usually originates in the tropical areas of the lower atmosphere, being a wind of extraordinary force that forms a whirlwind.
In this sense, the direction of these winds is influenced by the rotation of the Earth (Coriolis effect) and that as they move a little towards the higher latitudes, the direction winds are reversed and blow from west to east.
Therefore, we can conclude that the condition that affects the direction of hurricanes is when these tropical phenomena reach the highest latitudes.
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WF4-358 is a white dwarf in the globular cluster NGC 6397. This star's spectrum is highlighted with the red box. Notice that wavelength is tracked on the X axis and intensity is tracked on the Y axis. For this activity, we will be paying attention to the wavelengths that have the highest intensity. As you progress throughout the steps of this activity, you will be filling in this table:
Wavelength Suspected Element Frequency Energy
1.
2.
3.
Step 1: Study the Spectrum
Familiarize yourself with the spectral signature of this star, which shows which wavelengths are absorbed at which intensities. After studying the spectrum, notice which wavelengths ranges have the highest intensity (in other words, notice where the black line under WF4-358 reaches a high point and note which wavelengths ranges that point is associated with). Write down three wavelengths that have the highest intensity in WF4-358. Not that because of the scale of this particular graph, you likely won't be able to tell an exact wavelength. Instead, make the best guess that you can with the information you have. Fill in the first column (Wavelengths) of the table with your answer.
Step 2: Determine Elements
After documenting three wavelengths, refer to the diagram below to investigate which elements may be associated with those wavelengths.
For each of the three peaks in the spectrum you noted, make a guess about which element that peak represents. You will take the wavelength you noted in Step 1, and finding that wavelength on the diagram. For example, if you thought that a wavelength of 475 nm was a peak, you would find that wavelength on the chart and note that Argon might be the element represented by that peak. Repeat for all three peaks. Fill the second column (Suspected Element) of the table with your answers.
Step 3: Find Frequencies
Do some online research to find the frequencies of the three wavelengths you identified. Fill in the third column (Frequency) of the table with your answers.
Step 4: Calculate Energy
Use Planck's Equation to calculate the energy of a photon of light at each of the wavelengths you identified. Planck's Equation goes as follows:
E = hv
In this equation:
E = energy, and is unknown. This is what we are solving for.
h = Planck's constant (6.626 x 10^-34 joule-seconds)
v = frequency
Fill in the last column (Energy) of the table with your answers.
Step 5: Reflection Questions)
Would you expect the spectrum of a blackbody radiator to have peaks and valleys like the spectrum of WF4-358? Why or why not? Define blackbody radiators in your answer.
Pick one element from the chart you made. How might you expect its wavelength to change if it goes from traveling through Earth's atmosphere to traveling through water in the ocean?
Submit the following in one word processing document:
The table you completed in Steps 1-4
The answers to the reflection questions from Step 5
Answers
The highest points of intensity for WF4-358 include 390nm, 402nm, and 420nm (all estimated by x-axis locations in 10 nm increments).
What is wavelength?Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire. In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
These are the closest approximate wavelengths along the x-axis that correspond to the highest intensities along the y-axis for WF4-358.
The highest points of intensity for WF4-358 include 390nm, 402nm, and 420nm (all estimated by x-axis locations in 10 nm increments).
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Which has more inertia?
A human or an elephant and explain why?
Answers
Answer:
A human
Explanation:
An elephant weighs more, therefore it's gravitational pull by Earth impacts it more than a human.
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Answer:
Explanation:
Think of it this way: An elephant has more inertia than a human. It is much harder to push an elephant across a floor than it is a human, and much harder to stop the elephant once it is moving. Therefore, by definition, an elephant has more mass than a human.
A boy is running at -8 m/s and a girl running at -2 m/s. Who is running faster? How do you know?
Answers
Answer:
the girl is running faster because -2 is greater than -8
Explanation:
why was the astronomical uint created
Answers
How to Tell If an Element Is Paramagnetic or Diamagnetic
Answers
To determine if an element is paramagnetic or diamagnetic, one can perform a magnetic susceptibility test.
Paramagnetic and diamagnetic elements refer to the magnetic properties of elements and molecules. Paramagnetic materials are attracted to a magnetic field, while diamagnetic materials are repelled by a magnetic field.
Paramagnetic substances have a positive magnetic susceptibility, meaning they are attracted to a magnetic field and experience an increase in magnetic polarization. Diamagnetic substances have a negative magnetic susceptibility, meaning they are repelled by a magnetic field and experience a decrease in magnetic polarization.
Another way to determine the magnetic properties of an element is to observe its behavior in a magnetic field. If an element experiences attraction to a magnetic field, it is paramagnetic, and if it experiences repulsion, it is diamagnetic.
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Conversion Chart Temperature °C= 5/9 (°F - 32) Time 60 seconds = 1 minute 60 minutes = 1 hour 24 hours = 1 day Mass 1 pound = 16 ounces 1 ounce = 28.35 grams 1000 milligrams = 1 gram 1000 grams = 1 kilogram Length 1 mile = 1.6 kilometers 1 inch = 2.54 centimeters 100 centimeters = 1 meter 1000 meters = 1 kilometer Conversions for temperature, time, mass, and length.
1. 46,756,790 mg = _______ kg
2. 5.6 hours = ________ seconds
3. 13.5 cm = ________ inches
4. 47 °F = _______ °C
Answers
46,756,790 mg = 46.75679 kg
5.6 hours = 20,160 seconds
13.5 cm = 5.315 inches
47 °F = 8.333 °C
To convert milligrams (mg) to kilograms (kg), we divide the value by 1,000,000 (since there are 1,000,000 milligrams in a kilogram). Therefore, 46,756,790 mg divided by 1,000,000 equals 46.75679 kg.
To convert hours to seconds, we multiply the value by 3,600 (since there are 3,600 seconds in an hour). Therefore, 5.6 hours multiplied by 3,600 equals 20,160 seconds.
To convert centimeters (cm) to inches, we divide the value by 2.54 (since there are 2.54 centimeters in an inch). Therefore, 13.5 cm divided by 2.54 equals 5.315 inches.
To convert Fahrenheit (°F) to Celsius (°C), we use the formula °C = 5/9 (°F - 32). Plugging in the value 47 °F into the formula, we get °C = 5/9 (47 - 32), which simplifies to °C = 5/9 (15) = 75/9 ≈ 8.333 °C.
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How does the vapor pressure of water at 10c compare with it vapor pressure at 50c
Answers
Answer:
The vapour pressure of water is great tah 50 than it is 10.
Write ten sentences that is happening
around you now
Answers
2. My brother is doing his online schoolwork for the day.
3. I am taking a break from my online lessons.
4. During my break, I am brushing my hair and teeth.
5. I am laying in bed.
6. I can hear the strong wind blowing outside.
7. My cats are cuddling up to my feet.
8. There’s a spider spinning a web in my room.
9. My dog is barking at the wind.
10. My dad is busy finishing his work.
I hope this is helpful :)
Find the surface area of the filament of a 200 W bulb if all the electrical energy consumed by the bulb is radiated by the filament as electromagnetic waves. (Only a fraction of the radiation appears as visible light.)
Answers
Main Answer:Given data: Power of bulb, P = 200 W.We know that the rate of emission of energy by any body is given by Stefan-Boltzmann law asR = σT⁴whereR = rate of emission of energy per unit area (W/m²)σ = Stefan-Boltzmann constant (5.67 × 10⁻⁸ W/m²K⁴) the bulb is radiated by the filament as electromagnetic waves.
T = temperature of the body (K)From the law of conservation of energy, the rate of emission of energy by the filament will be equal to the rate of consumption of energy by the bulb.So, we can write the above relation asPR = σT⁴Surface area of filament, A = (P/PR) × (4πr²)
where r is the radius of filamentExplanation:Surface area of filament, A = (P/PR) × (4πr²)Let's calculate the rate of emission of energy per unit area, R.Substituting the values,PR = σT⁴ ⇒ R = P/σT⁴Surface area of filament, A = (P/PR) × (4πr²) = (P/(P/σT⁴)) × (4πr²) = σT⁴ × 4πr²Therefore, the surface area of the filament of a 200 W bulb if all the electrical energy consumed by the bulb is radiated by the filament as electromagnetic waves will be 2.24 × 10⁻⁵ m².
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When an object has a electrical charge, electrons are? _____ when it comes in contact with other objects
Answers
horizontal displacement?
Answers
Answer:
....
Explanation:
Imagine that you have an isotropic magnetized plasma with T ∥0
=T ⊥0
=T 0
. Double the magnetic field slowly compared to a gyroperiod, but fast compared to the energy transfer time between T ∥
and T ⊥
. What are the new values of T ∥
and T ⊥
(call them T ∥1
and T ⊥1
) ? Now let the plasma sit long enough for T ∥1
and T ⊥1
to mix by collisions and come to an isotropic temperature T 1
, but not long enough for the plasma to exchange energy with the outside world. What is T 1
? Reduce the magnetic field back down to its original value slowly compared to a gyroperiod, but fast compared to the energy transfer time between T ∥
and T ⊥
. What are T ∥2
and T ⊥2
? And after the plasma becomes isotropic, what is T 2
? This process is called 'magnetic pumping'.
Answers
The new values of T∥1 and T⊥1 will be equal to the original isotropic temperature T0.
When the magnetic field is doubled slowly compared to a gyroperiod but fast compared to the energy transfer time between T∥ and T⊥, the plasma remains magnetized, but the magnetic field becomes stronger. Since the energy transfer time between T∥ and T⊥ is much longer than the timescale of magnetic field doubling, the temperature anisotropy is not affected during this process. Therefore, T∥1 and T⊥1 remain equal to T0.
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a thin laser beam traveling in air strikes the surface of a glass plate at 41.2 with the normal. in teh plate, this beam makes an angle of 22.4 with the normal. what is the speed of light in this glass?
Answers
The speed of light in this glass is 1.58 x 10^8 m/s.
To solve this problem we can use the law of refraction. This law states that the ratio of the sines of the angles of incidence and refraction is equivalent to the ratio of the velocities in the two media. So, the ratio of the sines of the angles of incidence (41.2°) and refraction (22.4°) is equal to the ratio of the speed of light in the air (c) and the speed of light in glass (v). Therefore, v/c = sin(22.4°)/sin(41.2°), Substituting this into the equation yields that v = (c*sin(22.4°))/sin(41.2°). Using the approximate value for the speed of light in the air of 3.00 x 10^8 m/s, we get a value of v = 1.58 x 10^8 m/s.
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What is the acceleration of a car that is going at a steady speed of 60 mph?
Answers
Answer:
0
Explanation: you are only accelerating if you are slowing down, speeding up, or changing direction
In a sugar factory bagasse (the remains of the cane after the juice is extracted) is burned to provide electricity. The types of energy involved are W thermal energy X chemical energy Y electrical energy Z kinetic energy. In what order are these forms of energy converted in this process?A) WXZYB) XWZYC) WZXYD ZXWY
Answers
Given:
Thermal energy is denoted by W
Chemical energy is denoted by X
Electrical energy is denoted by Y
Kinetic energy is denoted by Z
To find the order of energy while converting bagasse to electricity.
Explanation:
The bagasse has chemical energy stored in it.
The bagasse is burned, so chemical energy gets converted into thermal energy.
The thermal energy gets converted into kinetic energy.
The kinetic results in the motion of electrons.
Thus, producing electrical energy.
Hence, the conversion order is XWZY
1. A man walks round a park, first walking north for 80m, then turning right and walking
for 50m. He then turns right again, and after 10m takes a left turn and continues for
70m. How far has he travelled from his start point?
Answers
The man has traveled a total distance of approximately 165.05m from his starting point.
To determine the distance traveled by the man from his starting point, we need to use the Pythagorean theorem to calculate the hypotenuse of the right triangle formed by his movements. The first movement, walking north for 80m, forms the vertical leg of the triangle, while the second movement, turning right and walking for 50m, forms the horizontal leg. This gives us the first right triangle.
Using the Pythagorean theorem, we can find the length of the hypotenuse:
\(c^2 = a^2 + b^2\)
\(c^2 = 80^2 + 50^2\)
\(c^2\) = 6,400 + 2,500
\(c^2\) = 8,900
c = 94.34
The third movement, turning right and walking for 10m, forms another leg of the triangle, and the final movement, taking a left turn and walking for 70m, forms the hypotenuse of a second right triangle.
Using the Pythagorean theorem again, we can find the length of the second hypotenuse:
\(c^2 = a^2 + b^2\)
\(c^2 = 10^2 + 70^2\)
\(c^2 = 100 + 4,900\)
\(c^2 = 5,000\)
c = 70.71
To find the total distance traveled, we add the lengths of the two hypotenuses:
94.34 + 70.71 = 165.05
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Which statement about diffraction is correct?
O The amplitudes of two waves combine to appear as one big wave.
O Sound waves bend around the corners of various obstacles.
O The amplitudes of two waves combine to appear as a wave smaller than the individual waves.
O Sound waves can only travel in straight lines.
Answers
Answer:
Sound waves bend around the corners of various obstacles.
Explanation:
I took the test
What is the current in milliamperes produced by the solar cells
of a pocket calculator through which 4.1 C of charge passes in 3.8
h?
Answers
To calculate the current (I) in milliamperes (mA) produced by the solar cells of a pocket calculator, we can use the formula:
I = Q / t
Where:
I is the current in amperes (A)
Q is the charge in coulombs (C)
t is the time in seconds (s)
First, let's convert the given time from hours to seconds:
t = 3.8 hours * 60 minutes/hour * 60 seconds/minute
t ≈ 13,680 seconds
Now we can substitute the values into the formula:
I = 4.1 C / 13,680 s
Calculating the result:
I ≈ 0.0003 A
Finally, to convert the current from amperes to milliamperes, we multiply by 1,000:
I ≈ 0.3 mA
Therefore, the current produced by the solar cells of the pocket calculator is approximately 0.3 milliamperes.
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Light travels at a speed of about 3.0 108 m/s.(a) How many miles does a pulse of light travel in a time interval of 0.1 s, which is about the blink of an eye?Δx = mi(b) Compare this distance to the diameter of Earth. (Use 6.38 106 m for the radius of the Earth.)ΔxDE =
Answers
Given:
Speed of light = 3 x 10⁸ m/s
Let's solve for the following:
• (a). How many miles does a pulse of light travel in a time interval of 0.1 s, which is about the blink of an eye?
Apply the formula:
\(\Delta x=v*t\)Where:
v is the speed of light
t is the time.
Thus, we have:
\(\begin{gathered} \Delta x=3.0\times10^8*0.1 \\ \\ \Delta x=3.0\operatorname{\times}10^7\text{ m} \end{gathered}\)Now let's convert the answer from meters to miles.
Where:
1 mile = 1609.34 meters
\(\begin{gathered} 3.0\times10^7=\frac{3.0\times10^7}{1609.34} \\ \\ =18641.14\text{ mi} \end{gathered}\)Δx = 18641.14 mi
• (b). Compare this distance to the diameter of Earth.
Apply the formula:
\(\frac{\Delta x}{D_E}=\frac{\Delta x}{2*r}\)Where:
r = 6.38 x 10⁶ m.
Thus, we have:
\(\frac{\Delta x}{D_E}=\frac{3.0\times10^7}{2*6.38\times10^6}=2.35\)ANSWER:
• (a). 18641.14 mi
,• (b). 2.35
Which phenomenon is used by light waves within fiber optic cables to travel from one point to another?.
Answers
Fiber optics assemble the use of a phenomenon known as total internal reflection. Light travels over a fiber optic cable by fine off the walls of the cable repeatedly.
What phenomenon is used by light waves within fiber optics?Optical fibers apply total internal reflection to transmit light. It has a solid core of thick glass surrounded by less dense covering. The light ray passing through the internal core is reflected back instead of being refracted to the rarer cladding. In fiber optics, each light particle (photon) is inside the pipe with continued internal mirror-like reflection. The light beam travels down the core of the cable. The core is in the middle of the cable fiber optics and the glass shape. The light in a fiber-optic cable travels through the core (hallway) by similarly bouncing from the cladding (mirror-lined walls), a principle called total internal reflection.
So we can conclude that These wavelengths are made in fiber optics because they have the lowest attenuation of the fiber.
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What is the answer, please help me
Answers
the object will accelerate 1/4 as much because the mass does not affect the object's acceleration