The explanation accepted by science until now, indicates that Earth's magnetic field is generated in the deepest of the terrestrial nucleus.
This is due to the movements of liquid metals in the core of the planet.
To explain it in more detail:
Right in the center of the Earth there is an internal core of solid iron at a very high temperature, this iron is as hot as the surface of the Sun, however, the pressure caused by the gravity force prevents it from becoming liquid. Around this inner core is the outer core, a layer of approximately 2000 km thick, composed of iron, nickel and small amounts of other metals in liquid state. Due to the lower pressure of the outer core, in relation to the inner core, the metal here is fluid (molten).
The differences in temperature, pressure and composition within the outer core cause convection currents in the molten metal, as the cold, dense matter sinks, and the warm, less dense matter rises. In addition, the Coriolis force, resulting from the spin of the Earth, also causes eddies in this mixture of molten metals.
This is how the movement of liquid iron inside the Earth generates electric currents, which in turn produce magnetic fields, and the spiral caused by the Coriolis force causes the magnetic fields to align in approximately the same direction, being this combined effect added to produce a vast magnetic field that envelops the entire planet.
This field extends from the terrestrial nucleus, progressively attenuating itself in outer space. However, it should be noted that unlike the field of a bar magnet, the Earth's magnetic field changes over time because it is actually generated by the movement of the iron alloys in the Earth's outer core, which causes the poles to move.
Answer: D
Explanation: the guy above gave a good explanation and is right
1.which of the following are true.
a.theories turn into laws with enough proof.
b. A hypothesis can be proven incorrect through experimentation.
C. A theory describes a natural phenomenon but offers no explanation for how it occurs.
D. A scientific law cannot be disproven by future observations
Answer:
its c i did usatestprep
Explanation:
Scientific law cannot be disproven. The correct statements are B and D are correct.
Hypothesis:It is a statement about a natural phenomenon that does not have any scientific proof.
Theory:It is a statement that has strong scientific evidence but can be changed when more data will be present. Theory cannot be changed into law because the theory itself is made up of laws.For example - The theory of relativity.Law:It is universal and had been proven correct every time. It cannot be changed.For example - Laws of motion
Therefore, scientific law cannot be disproven. The correct statements are B and D are correct.
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Why does life be life
Because you don't have your banana milk, broski
...
Life... is a dream.
...
Life... is a story.
...
Life... is a creation of human kind.
...
Life............................ is 42.
A football field is 100 yards long. If it takes a person 20 seconds to run its length, how fast were they running? Record your answer in yd/s and m/s.
it is 5 yds/s to run the football firld
A 0.6 kg basketball with a velocity of +6 m/s rolls toward a 0.2 kg ball of clay with a velocity of +1 m/s. If the balls collide and stick together, what is the velocity following the collision?
7 m/s I believe I would check with your teacher if anything
What is the magnetic flux linkage, in units of Weber, for a coil of 360 turns and cross sectional area of 0.133 m^2 when the magnetic flux density of 1.74 T passes through the area perpendicularly?
Answer:
83.3 Wb
Explanation:
The magnetic flux linkage through the coil is given by:
[tex]N\phi = BAN sin \theta[/tex]
where
B is the magnetic field strength
A is the cross sectional area
N is the number of turns in the coil
[tex]\theta[/tex] is the angle between the direction of the field and the normal to the coil
In this problem:
B = 1.74 T
A = 0.133 m^2
N = 360
[tex]\theta=90^{\circ}[/tex]
Therefore, the magnetic flux linkage is
[tex]N\phi = (1.74 T)(0.133 m^2)(360) sin 90^{\circ}=83.3 Wb[/tex]
when you mix sugar into water in a beaker the sugar is no longer visible. what happens in the beaker
the sugar dissolves, but is still there, just not visible
Why is the amplitude of the radio wave in figure 1 varied?
This is an example of amplitude modulation which is a method to transmit analog signals via radio-spectrum waves. A carrier sine wave (in the image, the one with the higher frequency) is modulated (in amplitude) by another signal (the target of transmission). The carrier due to its appropriate frequency enables successful transmission of a signal that would otherwise be difficult to transmit (due to its too low frequencies) and also enables transmission of multiple channels at different carrier frequencies.
Classic example: AM radio.
what is the reading of the vernier calliper?
what coefficient of KCI
Explanation:
Start with the unbalanced equation:
KClO
3
→
KCl
+
O
2
A method that often works is to balance everything other than
H
and
O
first, then balance
O
, and finally balance
H
.
Another rule is to start with what looks like the most complicated formula.
The most complicated formula looks like
KClO
3
.
We put a
1
in front of it and mark the
1
to remind ourselves that the number is now fixed.
We can't change a coefficient unless we run into a roadblock (like having to use fractions).
My teacher never let me use fractions.
My solution when I hit a roadblock was to erase all the numbers and then start over again with a 2 as the starting coefficient.
We start with
1
KClO
3
→
KCl
+
O
2
Balance
K
:
We have 1
K
on the left, so we need 1
K
on the right. We put a
1
in front of the
KCl
.
1
KClO
3
→
1
KCl
+
O
2
Balance
Cl
:
Cl
is already balanced, with 1
Cl
on each side.
Balance
O
:
We have 3
O
atoms on the left and only
2
on the right. We need 1½
O
2
molecules on the right. Uh, oh! Fractions!
We start over with a 2 as the coefficient.
2
KClO
3
→
2
KCl
+
O
2
Now we have 6
O
atoms on the left. To get 6
O
atoms on the right, we put a 3 in front of the
O
2
.
2
KClO
3
→
2
KCl
+
3
O
2
Every formula now has a fixed coefficient.
We should have a balanced equation.
Let’s check:
Left hand side: 2
K
, 2
Cl
, 6
O
Right hand side: 2
K
, 2
Cl
, 6
O
All atoms balance.
The balanced equation is
The coefficient of KCl in a dissolution reaction is '1'. The question may be mixing up the concept of KCl dissolution with equilibrium constants for other reactions, such as CO2 with water. A chemical context is needed to provide a specific coefficient for KCl.
Explanation:The question what coefficient of KCl appears to be asking for the coefficient (stoichiometric number) in front of the chemical formula KCl in a balanced chemical equation. However, to provide a specific coefficient, there needs to be a context of a complete chemical reaction. If the reaction is simply the dissolution of KCl in water, the coefficient is typically '1' because the dissolution equation would be KCl(s) → K+(aq) + Cl-(aq), with each ion being produced in a 1:1 ratio.
In chemistry, equilibrium constants, such as the solubility product constant (Ksp) for salts like KCl, are crucial for understanding the solubility and dissociation of compounds. The Ksp for KCl would be the product of the concentrations of the K+ and Cl- ions at equilibrium. The value of K you mentioned corresponds to the equilibrium constant for the reaction between carbon dioxide and water, which is different from the solubility product of KCl.
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Which is an example of a chemical change?
Answer: Option C
Explanation: The chemical change can be defined as the change that once occurred cannot be reversed by any means.
The metal corrosion in the salt water is an example of chemical change as it cannot be reversed once the metal is corroded. This also results in the change in the color of the metal and further decaying of the metal at later stages.
50 POINTS! A Dancer leaps across the stage in a beautiful grand jete. The ballerina leaps at an angle of 25° and is able to jump a horizontal distance of 1.5m. What is her initial x and initial y velocity? (hint: find Vi first, then Vxi and Vyi)
The horizontal range formula tells us
[tex]x=\dfrac{{v_i}^2\sin2\theta}g[/tex]
where [tex]v_i[/tex] is the dancer's initial speed, [tex]\theta[/tex] is her launch angle, and [tex]g[/tex] is the acceleration due to gravity. So
[tex]1.5\,\mathrm m=\dfrac{{v_i}^2\sin50^\circ}{9.8\frac{\rm m}{\mathrm s^2}}\implies v_i=4.4\dfrac{\rm m}{\rm s}[/tex]
Her initial velocity as a vector is
[tex]\vec v_i=v_{xi}\,\vec\imath+v_{yi}\,\vec\jmath[/tex]
where
[tex]v_{xi}=v_i\cos25^\circ=4.0\dfrac{\rm m}{\rm s}[/tex]
[tex]v_{yi}=v_i\sin25^\circ=1.9\dfrac{\rm m}{\rm s}[/tex]
Answer: 1.9m/s.
Explanation: 1.9m/s.
what does a resistor do in a circuit?
lowers the amount of voltage going through a circuit
If there is but one resistor in the circuit, it will limit the current flow according to E = I*R
If there are two resistors in series in the circuit, they will affect a voltage divider.
Though you haven't asked for it, the voltage drop across the 3 ohm resistor is E = I*R
I = 5 amps
R = 3 ohms
E = 5 * 3 = 15 Volts
And through the 2 ohm resistor, you get
I = 5 amps
R = 2 ohms
E = 2*5
E = 10 volts.
So the total is 10 v + 15 v = 25 volts
Each resistor then has a reading in voltage across it. That is called a voltage divider.
===========
One "resistor" like a light bulb is made to give light and also to limit the current.
Which change would cause the largest increase in a mountain climber’s gravitational potential energy?
Most likely climbing up the mountain
carrying twice the weight and climbing twice as high
In what part of a volcano would you expect to find rocks with the coarsest grains
Answer:
The correct answer is: in the magma chamber.
Explanation:
The volcanoes are creating igneous rocks, and they can be intrusive and extrusive. The intrusive ones are forming deep into the ground, while the extrusive are forming on the surface. Where the rocks are formed makes a big difference in their crystals size. The rocks that form by magma that has cooled the deepest into the ground would have the largest crystals, thus the coarsest grains. The reason for this is that the magma that has been cooling the deepest into the ground will be exposed to higher temperatures and pressures, which will lead to a very slow cooling off. Because the cooling off will be at such a slow rate, the crystals will have enough time to became much larger. The deepest part of a volcano is its magma chamber, thus it will be the place that will produce the coarsest grained igneous rocks.
what is the input force needed to push a 1580 newton snowmobile up a 2.5 long board into the back of a pick-up truck. the bed of the pickup is 1.10 meters high and the board is 80% efficient?
869 Newtons.
ExplanationWhat's the gain in Gravitational Potential Energy in this process?
[tex]\displaystyle \Delta \text{PE} = \underbrace{(m\cdot g)}_{1580\;\text N}} \cdot \Delta h = 1580\times 1.10\;\text{m} = 1738\;\text{J}[/tex].
What's the energy input in this process?
The output of the board is the same as the gain in gravitational potential energy, 1738 Joules.
[tex]\displaystyle W_\text{in} = \frac{W_\text{out}}{\text{Efficiency}} = \frac{1738}{0.8} = 2172.5\;\text{J}[/tex].
[tex]F = \dfrac{W_\text{in}}{d}= \dfrac{2172.5}{2.5} = 869\;\text{N}[/tex].
how to find displacement?
To find the displacement, draw a vector from your starting point to your end point and solve for the length of this line.
Hope this helps!
Davinia.
Displacement in physics is the overall change in position of an object. It can be computed using the equation Δx = x₁ - x₀ (final position - initial position). For more complex scenarios, you calculate the area between the velocity-time graph and time axis or use displacement vectors for multi-dimensional scenarios.
Explanation:In Physics, displacement represents the overall change in an object's position. This is different from distance which accounts for the total ground an object covered. To calculate displacement, we need to know the initial and final positions of the object and use the equation, Δx = x₁ - x₀ where Δx is the displacement, x₁ is the final position, and x₀ is the initial position.
For example, If an object moves from position 3m (x₀) to position 8m (x₁), the displacement (Δx) would be 8m - 3m = 5m. This is a simplified example, for complex scenarios where there is varying speed or acceleration, you might need to calculate the area between the velocity vs. time graph and the time axis.
To visualize displacements in more than one dimension, we use displacement vectors. Here you would also need to take direction into account while calculating the overall displacement.
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Frogs need water to lay their eggs. It has not rained for many months. The lake is getting smaller. Billy does not see many tadpoles at the lake because A) the frogs have laid fewer eggs. B) the lake is overcrowded with fish. C) the fish ate all of the frog eggs. D) the frog eggs won't hatch in hot weather.
Either Answer Choice A Or D
Answer:
THE ANSWER IS A
Explanation:
the strong nuclear force is
about the same as the electric force
75 times smaller than electric force
more than 100 times greater than the electric force
Answer is option C.100 times greater than electric force.
in the nucleus ,protons are close to each other ,because of the strength of strong nuclear force.
Each color has its own frequency and wave length? True or false
Each color does have it's own frequency an wave length.
The use of wind power to generate electricity is a big advantage because it is____.
A.) Nonpolluting
B.) Exhaustible
The answer is Nonpolluting
The correct answer would be A (Nonpolluting), hope this helps! (:
What is the magnetic field strength, in units of microTesla (T), at a distance of 6.3 cm from a long straight wire carrying a current of 6.5 A?
Answer:
[tex]2.1 \mu T[/tex]
Explanation:
The magnetic field strength is given by:
[tex]B=\frac{\mu_0 I}{2 \pi r}[/tex]
where
[tex]\mu_0[/tex] is the vacuum permeability
I is the current
r is the distance from the wire
In this problem,
I = 6.5 A
r = 6.3 cm = 0.063 m
So, the magnetic field strength is
[tex]B=\frac{(1.256\cdot 10^{-7} H/m)(6.5 A)}{2 \pi (0.063 m)}=2.1\cdot 10^{-6} T=2.1 \mu T[/tex]
A rock is projected upward from the surface of the moon, at time t = 0.0 s, with a velocity of The acceleration due to gravity at the surface of the moon is When does the rock reach a height of 180 m above the moon's surface?
17 s
12 s
30 s
23 s
7.5 s
7.5 seconds
Explanation;Given u= initial velocity=30m/sec
a= acceleration on moon=1.62m/s2
h=180m
Using the equation
h = u(t) - 1/2gt² {where g = 1.62 m/s²} and u = 30 m/s
180 = 30t - (0.5)(1.62)t²
0 = 0.81t² - 30t +180
solving the quadratic equation for the 2 t-values:
t = 7.5 s or t = 30 s
Therefore; the time taken to reach a height of 180 m upwards is 7.5 seconds
50 POINTS! A Boy throws a ball horizontally a distance of 22m downrange from the top of a tower that is 20.0m tall. What is his throwing velocity?
The ball's horizontal and vertical velocities at time [tex]t[/tex] are
[tex]v_x=v_{xi}[/tex]
[tex]v_y=v_{yi}-gt[/tex]
but the ball is thrown horizontally, so [tex]v_{yi}=0[/tex]. Its horizontal and vertical positions at time [tex]t[/tex] are
[tex]x=v_{xi}t[/tex]
[tex]y=20.0\,\mathrm m-\dfrac g2t^2[/tex]
The ball travels 22 m horizontally from where it was thrown, so
[tex]22\,\mathrm m=v_{xi}t[/tex]
from which we find the time it takes for the ball to land on the ground is
[tex]t=\dfrac{22\,\rm m}{v_{xi}}[/tex]
When it lands, [tex]y=0[/tex] and
[tex]0=20.0\,\mathrm m-\dfrac{9.8\frac{\rm m}{\mathrm s^2}}2\left(\dfrac{22\,\rm m}{v_{xi}}\right)^2[/tex]
[tex]\implies v_i=v_{xi}=11\dfrac{\rm m}{\rm s}[/tex]
Answer: 11m/s.
Explanation: 11m/s.
how is force related to acceleration and gravity?
Newton's second law of motion describes the relationship between force and acceleration. They are directly proportional. If you increase the force applied to an object, the acceleration of that object increases by the same factor. In short, force equals mass times acceleration.
Final answer:
Force is related to acceleration and gravity through Newton's second law of motion, where F = ma. Gravity causes objects to accelerate towards Earth at a constant rate of 9.8 m/s², regardless of mass. In scenarios like free fall, simple relations like v = u + at show the direct relationship between force and acceleration.
Explanation:
Force is related to acceleration and gravity through Newton's second law of motion. The formula representing this relationship is F = ma, where F is the force applied to an object, m is the mass of the object, and a is the resulting acceleration.
Gravity, as described by Newton's universal law of gravitation, causes objects to accelerate towards Earth at a constant rate of 9.8 m/s² near the surface of the Earth, regardless of their mass. This special property of gravity results in all objects experiencing the same acceleration due to gravity.
When considering a constant force and acceleration scenario, such as free fall in a uniform gravitational field without air resistance, simple relations like v = u + at can be derived, demonstrating the direct relationship between force and acceleration.
The diagram shows how an image is produced by a plane mirror.
Which letter shows where the image will be produced?
W
X
Y
Z
I had this question on a quiz, it was X.
Answer:
X
Explanation:
A plane mirror produces a virtual and erect image. The distance of the image from the mirror is same as distance of object from the mirror. The image formed is of the same size as of the object. The image is produced behind the mirror.
In the given diagram, the image of the ball would form behind the mirror at position X which is at equal distance from mirror as the ball is.
Which statement best describes the polarization of light? A. The wave oscillates in all the planes possible. B. The wave does not oscillate. C. The wave oscillates in a single plane. D. The wave oscillates parallel to its direction of motion.
Answer:
A
Explanation:
A 10.00-kilogram block slides along a horizontal, frictionless surface at 12.0 meters per second for 6.00 seconds. The magnitude of the block's momentum is
Answer:
120 kg m/s
Explanation:
The magnitude of the momentum of an object is given by
[tex]p=mv[/tex]
where
m is the mass of the object
v is its speed
For the block in this problem,
m = 10.0 kg (mass of the block)
v = 12.0 m/s (speed of the block)
Therefore the magnitude of the block's momentum is
[tex]p=(10.0 kg)(12.0 m/s)=120 kg m/s[/tex]
All of the following are functions of the sensory somatic nervous system except
it sends signals that control heat rate and respiration
it receives messages and relays stimulus to contract muscle fibers
it receives messages from the central nervous system
it sends messages directly to muscles and glands
Answer:
It sends signals that control heat rate and respiration
Explanation:
We breath without thinking this is because of the the autonomic nervous system. (ANS) is an involuntary system it acts without our conscious control.
The sensory-somatic nervous system do not control heat rate and respiration. Hence, option (A) is correct.
The nervous system containing sensory as well as the motors neurons is known as sensory-somatic nervous system. These are made up of the cranial and spinal nerves that transmit information from the skin, skeletal muscles to the Central Nervous System.
As per the given problem:
(A)
The sensory-somatic nervous system sends signals from skin and muscle to Central Nervous System, but it does not control heat rate and respiration. Hence, this statement is correct (means it is not the function of sensory-somatic nervous system).
(B)
Sensory-somatic nervous system receives messages and relays stimulus to contract muscle fibers. Hence, it is a function and the option is incorrect.
(C)
The sensory-somatic nervous system exchanges the information between the various organs to Central Nervous System. Hence, the option is incorrect.
(D)
At some instant, sending neuro signals directly to muscle and glands is also a function of sensory-somatic nervous system. So, the option is incorrect.
Thus, we conclude that out of all the given options, the sensory-somatic nervous system do not control heat rate and respiration. Hence, option (A) is correct.
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Which of the following is not a benefit of improved cardio-respiratory fitness?
A. Arteries grow bigger
B. Resting blood pressure goes down
C. Risk of heart disease decreases
D. Slower post exercise recovery time
I wanna say it’s D. Slower post exercise recovery time.
Slower post exercise recovery time is not a benefit of improved cardio-respiratory fitness. Thus, the correct option is D.
Cardiorespiratory fitness is the ability of the circulatory and respiratory systems to supply sufficient amount of oxygen to skeletal muscles during sustained physical activity. Scientists and researchers use cardiorespiratory fitness to assess the functional capacity of the respiratory and the cardiovascular systems.
The benefits of cardiorespiratory exercise include lower blood pressure, improve blood flow, improve workout efficiency, lower cholesterol levels, decrease risk of heart disease, stroke and diabetes, and other heart-healthy habits.
Therefore, the correct option is D.
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Which three statements about electromagnetic radiation are true?
-- Light is electromagnetic radiation.
-- Electromagnetic radiation has no mass.
-- Electromagnetic radiation can travel through vacuum.
Answer:
Option (1), (3) and (4) are correct.
Explanation:
When the oscillating electri and magnetic field interacts perpendicularly to each other, the electromagnetic radiations are produced. The electromagnetic radiations propagates in the perpendicular direction of both electric and magnetic field vectors.
For example, gamma rays, X rays, ultra violet rays, visible radiations, infrared rays, micro waves and radio waves.
Electromagnetic radiations do not require any medium for their propagation.
They do not carry mass, they carry energy only.