Answer:
When a pollen grain is placed in water, it may exhibit movement due to various factors such as osmosis, surface tension, and water absorption. The direction in which the pollen grain moves can depend on these factors and the specific characteristics of the pollen grain.
Osmosis: Osmosis is the movement of water molecules across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration. If the pollen grain has a higher solute concentration than the surrounding water, water molecules will move into the pollen grain, causing it to swell or expand. This can result in movement towards areas of lower water concentration.
Surface Tension: Surface tension is the property of a liquid that allows it to resist external forces. The surface tension of water can cause the pollen grain to be pulled or dragged along the surface of the water, creating movement in a particular direction. This movement is influenced by the shape and weight distribution of the pollen grain.
Water Absorption: The outer covering of a pollen grain, called the exine, may have the ability to absorb water. As water is absorbed, the pollen grain can become hydrated and change in size and weight. This change in physical properties can lead to movement in a specific direction.
It's important to note that the direction of movement may not always be uniform or predictable, as it can be influenced by multiple factors and the unique characteristics of the pollen grain. Additionally, external factors such as water currents or agitation can also affect the movement of the pollen grain in water.
Observing the actual movement of a pollen grain in water would provide a more accurate understanding of its specific direction and behavior in that particular instance.
HELPPPPPPPPP PLEASEEEEEE On this graph, which material has the lowest density? Density comparison Question 4 options: red yellow green blue
Yellow has the lowest density. I took the test and got this question correct. :)
The object represented by the yellow graph has the lowest density.
What is density?
It is defined as the mass per unit volume of the body. Mathematically -
ρ = M/V
Given is a graph showing the variation of the mass with volume.
All of the given graphs are straight lines. The slope of the line determines the proportionality constant or density of the four objects whose graphs are plotted. The graph with the maximum slope will have the highest density and with the minimum slope has lowest density. It can be seen that the yellow graph has the smallest slope (slope is the angle any straight line makes with x - axis). So it will have the lowest density.
Therefore, the object represented by the yellow graph has the lowest density.
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two forces 3N and 4N act on a body in a direction due north and due East respectively calculate their equivalent
Two forces 3N and 4N act on a body in a direction due north From East, the equilibrant's angle is given by \(\theta=\tan ^{-1} \frac{3}{4}=36.8^{\circ}\).
What are equilibrium and resultant force?The equilibrium force is the balanced force when the net force acting is zero and is the exact opposite of the consequent force. The resultant force is one single force replaced by numerous forces.
Briefing:3N and 4N are the two forces pulling on a body.
The forces work along the North and the East, which are perpendicular to one another.
The resultant of the forces, which is provided by the equilibrant force,
R = √(3)²+(4)²
R = 5N
From East, the equilibrant's angle is given by
\(\theta=\tan ^{-1} \frac{3}{4}=36.8^{\circ}\)
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HELPPPPPPP MEEEEEEE ASAP PLZZZZZZZZZ
If a force of 0.05 N acts on a body of mass 100 grams. Determine the acceleration at which that body moves.
Answer:
a=f/m=0.05/0.1kg
Explanation:
calculate it
hope I helped
A current of 27.0 mA is maintained in a single circular loop of 3.90 m circumference. A magnetic field of 0.710 T is directed parallel to the plane of the loop.a) Calculate the magnetic moment of the loop.b) What is the magnitude of the torque exerted by the magnetic field on the loop?
The magnetic moment is M = 5.40 × \(10^{-3} Am\) and the magnitude of the Torque exerted by the magnetic field on the loop is τ = 4.32 × \(10^{-3}\) Nm.
What does the term "magnetic moment" mean?
The measurement of an object's propensity to line up with a magnetic field is known as a magnetic moment, sometimes known as a magnetic dipole moment. The magnetic pull and direction of a magnet or other item that generates a magnetic field are known as the "Magnetic Moment" A vector quantity is the magnetic moment.
What is the magnetic moment in SI units?
Weber moment is the magnetic moment unit. Wb is used to symbolize it.
What in physics is torque?
Torque is the rotating counterpart of force in physics and mechanics. It goes by a variety of names depending on the field of research, including moment, moment of force, rotating force, and turning effect. This demonstrates how a force may alter a body's rotational motion.
Given that current through the loop is I = 17 ×\(10^{-3}\) A,
Circumference is S = 2m
if r is the radius then S = 2πr = 2m
r = 0.318m
strength of the field is B = 0.8T
a) The magnetic moment is M = I(π\(r^{2}\))
= 5.40×\(10^{-3}\)Am
b) Torque parallel to the coil is τ = MB
= 4.32×\(10^{-3}\) Nm
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Lizette works in her school’s vegetable garden. Every Tuesday, she pulls weeds for 15 minutes. Weeding seems like a never-ending task. Each time Lizette goes to the garden, there are just as many weeds as the week before!
Lizette’s teacher suggests that she use a strong solution of vinegar to kill the weeds. Vinegar is acidic and prevents plants from maintaining homeostasis. Lizette sets up a controlled experiment to test her hypothesis that the solution will kill the weeds without harming nearby vegetables. She plans to spray one group of weeds with the solution and another group of weeds with water as a control.
What variables should Lizette keep the same between the control group of weeds and the sprayed weeds?
The variables that Lizette should keep the same between the control group of weeds and the sprayed weeds include : type of weed, age and size of the weeds, amount of sunlight and water , location of the weeds and amount and frequency of spraying.
What variables should Lizette keep the same between control group of weeds and sprayed weeds?The variables that Lizette should keep the same between the control group of weeds and the sprayed weeds include:
The type of weed: To ensure that the control group of weeds and the sprayed weeds are comparable, Lizette should use the same type of weed in both groups.
The age and size of the weeds: Lizette should select weeds of similar age and size for both groups, as larger or older weeds may be more resistant to the vinegar solution.
The amount of sunlight and water: The amount of sunlight and water that the control group of weeds and sprayed weeds receive should be same, as these factors can affect plant growth and health.
The location of the weeds: The control group of weeds and the sprayed weeds should be located in same area of the garden, as differences in soil composition or other environmental factors could affect the results.
The amount and frequency of spraying: Lizette should apply the same amount of water to the control group of weeds as she applies vinegar solution to the sprayed weeds, and frequency of spraying should also be same.
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Please help! I'm begging anyone! This is urgent! These are the problems in physics I am having difficulty with!
1) While helping a friend move, you lift a 189 N box full of books and perform 174 J of work to do so. What distance, directly upward, do you lift the box? Show all of your work.
2) A bungee jumper with a weight of 613 N leaps off a bridge. He is in free fall for a distance of 22.6 m before the cord begins to stretch. How much work, in kilojoules, does the force of gravity do on the jumper before the cord begins to stretch? Show all of your work.
3) You and your neighbor are shoveling snow. If your neighbor pushes a shovel four times as far as you do, but exerts only half the force, which one of you does more work and by how much? Show all of your work.
Answer:
1.
Distance = 0.921 meters
2.
Work = 13.9 kJ
3.
The neighbor
Double your work
Explanation:
1.
Work = Force × Distance
Distance = Work / Force
Distance = 174J /189 N
Distance = 0.921 meters
2.
Work = force × distance
Work = (613 N) (22.6 m)
Work = 13,900 J
Work = 13.9 kJ
3.
Work is a product of force and distance, expressed as W=Fd where W is work in Nm, F is applied force and d is the distance in m
Since your neighbor pushes 4 times then you just push 1m when he pushes 4m, that is an example. Also, since the neighbor only exerts half the force i.e. 0.5N then you exert full force of 1N
Work from your neighbor will be 4d*0.5F=2dF
Work from you will be dF
Clearly, 2dF=2(dF) hence the neighbor exerts double work
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In each case, three charged particles are fixed in place at the vertices of an equilateral triangle. The triangles are all the same size. Rank the magnitude of the net electric force on the lower-left particle. Greatest ______ _______ _______ _______ Least Explain your reasoning.
Answer:
hello your question is incomplete attached below is the complete question
answer : \(F_{E} > F_{F} > F_{A} = F_{B} > F_{C} =F_{D}\)
Explanation:
The explanation behind the reasoning is attached below
Ranking the magnitude of the net electric force on the lower-left particle from the greatest to the least
\(F_{E} > F_{F} > F_{A} = F_{B} > F_{C} =F_{D}\)
The magnitude of the net electric force on the lower-left particle. greatest to least in order of \(\rm F_E > F_F > F_A= F_B > F_C=F_D\)
What is electric force?The electric force between the two charges is directly propotional to the product of the charge and inversly propotional to the square of the distance between them.
The electric force for each case found as;
\(\rm F_1 = \frac{2K q^2}{q^2} \\\\ \rm F_2 = \frac{2K q^2}{q^2} \\\\\)
\(\rm F_3= 2 m \\\\ \rm \rm F_4= 4\sqrt{3} m\\\\ \rm F_5= 4m\)
Hence the magnitude of the net electric force on the lower-left particle. greatest to least in order of \(\rm F_E > F_F > F_A= F_B > F_C=F_D\)
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11. In the original Ghostbusters, when asked by Dr. Peter Venkman what would happen if they crossed the streams from their proton packs, Dr. Egon Spengler responded, "It would be bad." The same thing could reasonably be said about _________ Specifically, the reason for this is due to violation of the assumption of _____________
The same thing could reasonably be said about multicollinearity. Specifically, the reason for this is due to the violation of the assumption of independent predictors.
Let us understand what these terms mean:
MulticollinearityIn statistical analysis, multicollinearity is the high correlation among predictors in a regression model. It is problematic because of its adverse effects on the model, including making it difficult to determine the effect of an independent variable, coefficients becoming insensitive to small changes in the model, and reducing the reliability of the model.
Independent PredictorsIn regression analysis, independent predictors are those variables that contribute to the prediction of the dependent variable or outcome, and their inclusion in the model improves the accuracy of the prediction of the model.
In a regression model, it is an assumption that predictors are independent, which means that the predictors have little to no correlation with each other. If this assumption is violated, it is known as multicollinearity.
Therefore, the same thing could reasonably be said about multicollinearity. Specifically, the reason for this is due to the violation of the assumption of independent predictors.
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in section 3 of the dsm-5-tr, the diagnosis of a(n) will require meeting the following sets of criteria: determining how a person functions in terms of identity and self-direction, determining how a person functions in relationships with others, and ratings of specific traits.
The diagnosis of a personality disorder in section 3 of the DSM-5-TR will require meeting criteria related to determining how a person functions in terms of identity and self-direction.
Clinicians use clinical interviews, observations, and psychological assessment measures to gather information and evaluate an individual's functioning in these three areas. They consider the individual's reported experiences, behavioral patterns, and the impact of these difficulties on their overall well-being. The specific criteria for each personality disorder outlined in the DSM-5-TR guide clinicians in making a comprehensive and accurate diagnosis.
Section 3 of the DSM-5-TR provides criteria for the diagnosis of personality disorders, emphasizing the assessment of identity and self-direction, relationships with others, and ratings of specific traits. This comprehensive approach helps clinicians understand the individual's personality functioning and make appropriate diagnostic determinations.
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why does a dropped bullet hit the ground at the same time as a bullet that is shot when released at the same time from the same height
Answer:
If the fired bullet leaves the gun muzzle parallel to the ground (no vertical y velocity), then it will only have horizontal (x direction) velocity, and the downward force of gravity will be the only vertical y force on the bullet. Hence the time it takes to strike the ground is the same as that of a dropped bullet.
Explanation:
At a circus, a human cannonball is shot from a cannon at 15m/s at an angle of 40° above horizontal. She
leaves the cannon 2m off the ground and lands in a net 1m off the ground. What height does she reach?
How much ground distance does she cover?
Answer:
a
The height is \(H = 6.74 \ m \)
b
The horizontal distance is \(D = 23.74 \ m \)
Explanation:
From the question we are told that
The speed is \(v = 15 \ m/s\)
The angle is \(\theta = 40^o\)
The height of the cannon from the ground is h = 2 m
The distance of the net from the ground is k = 1 m
Generally the maximum height she reaches is mathematically represented as
\(H = \frac{v^2 sin^2 \theta }{2 * g } + h\)
=> \(H = \frac{(15)^2 [sin (40)]^2 }{2 * 9.8} + 2\)
=> \(H = 6.74 \ m \)
Generally from kinematic equation
\(s = ut + \frac{1}{2} at^2\)
Here s is the displacement which is mathematically represented as
s = [-(h-k)]
=> s = -(2-1)
=> s = -1 m
There reason why s = -1 m is because upward motion canceled the downward motion remaining only the distance of the net from the ground which was covered during the first half but not covered during the second half
a = -g = -9.8
\(u = v sin (\theta)\)
So
\(-1 = (vsin 40 )t + \frac{1}{2} * (-9.8) t^2\)
=> \(-4.9t^2 + 9.6418t + 1 = 0\)
using quadratic formula to solve the equation we have
\(t = 2.07 \ s\)
Generally distance covered along the horizontal is
\(D = v cos (40) * 2.07\)
=> \(D = 15 cos (40) * 2.07\)
=> \(D = 23.74 \ m \)
A robin is flying around and its velocity vvv as a function of time ttt is given in the graph below where rightwards is the positive velocity direction. What is the robin's displacement \Delta xΔxdelta, x from t=0\,\text st=0st, equals, 0, start text, s, end text to 1.5\,\text s1.5s1, point, 5, start text, s, end text?
Answer:
-0.75
Explanation:
Khan Academy gives answer here.
!!!!Has anybody done the Lab report : Thermal Energy Transfer on edg? For physics
2 pages of data
Answer: the only thing I can't give you is the lab report because I haven't done it yet i dont want to lol.
Explanation:
i got a bunch of answers so if my answers are correct im putting them here
Two ropes are attached to a wagon, one horizontal to the west with a tension force of 30 N, and the other east and at an angle of 30° upward from horizontal with a tension force of 40 N. Find the components of the net force on the cart. Show your work.
Answer:
\(F_t=(4.64i+20j)N\)
Explanation:
Force in this problem is a vector quantity, so:
\(x_1=F_1[cos(\theta_1)]\\y_1=F_1[sin(\theta_1)]\)
and
\(x_2=F_2[cos(\theta_2)]\\y_2=F_2[sin(\theta_2)]\)
For this problem:
\(F_1=30N\\F_2=40N\)
\(\theta_1=180\)°=\(\frac{pi}{2}\)
\(\theta_2=30\)°=\(\frac{pi}{6}\)
The net force (\(F_t\)) is equal to the sum of the forces:
\(F_t=F_a+F_b\\\\F_a=30N[cos(\frac{\pi}{2})i+sin(\frac{\pi}{2})j]\\F_a=30N(-1i+0j)\\F_a=-30Ni\\\\F_b=40N[cos(\frac{\pi}{6})i+sin(\frac{\pi}{6})j]\\F_b=40N(\frac{\sqrt3}{2}i+\frac{1}{2}j)\\F_b=(20\sqrt3i+20j)N\\F_b=(34.64i+20j)N\\\\F_t=[(-30i)+(34.64+20j)]N\\F_t=(4.64i+20j)N\)
Hope that helps.
irina of mass 110 kg floats in fresh water. what is her approximate volume in m3? (human density is about 1000 kg/m3)
Irina of mass 110 kg floats in fresh water, the volume is 0.06m³.
What is buoyant force?The buoyant force is the upward force exerted on any object by the fluid. If the buoyant force is lesser than the object's weight, the object will sink while if buoyant force is greater than the object's weight it will float.
In the question irina of mass 110 kg floats in fresh water that indicates:
weight of irina = buoyant force
mg = Vρg
m = Vρ
Where, m = mass of irina
V = volume
ρ = density of water
110 = V × 1000
V = \(\frac{110}{1000}\)
V = 0.11m³
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A 345 kg block has a weight of __ on earth.
A) 345 kg
B) 345 pounds
C) 345 N
D) 34.5 N
Answer:
The correct answer is;
3450 N
Explanation:
The given parameters are;
The mass of the block = 345 kg
The location of the block = Earth
The weight, W, of an object on Earth is given by the mass of the object × The acceleration due to gravity
The acceleration due to gravity on Earth ≈ 10 m/s²
Therefore, we have;
The weight of the block on Earth = The mass of the block × The acceleration due to gravity of the block = 345 kg × 10 m/s²
∴ The weight of the block on Earth = 3450 kg·m/s² = 3450 N
A 350 kg block has a weight of 3450 N
(Therefore, a 34.5 kg block has a weight of 345 N)
A bullet is fired horizontally at a height of 1.3 meters and a velocity of 950 m/s. How long was the bullet in the air?
Answer:
The bullet was 0.52 seconds in the air.
Explanation:
Horizontal Motion
It occurs when an object is thrown horizontally with a speed v from a height h.
The object describes a curved path ruled exclusively by gravity until it hits the ground.
To calculate the time the object takes to hit the ground, we use the following equation:
\(\displaystyle t=\sqrt{\frac{2y}{g}}\)
Note it doesn't depend on the initial velocity but on the height.
The bullet is fired horizontally at h=1.3 m, thus:
\(\displaystyle t=\sqrt{\frac{2\cdot 1.3}{9.8}}\)
\(\displaystyle t=\sqrt{\frac{2.6}{9.8}}\)
t = 0.52 s
The bullet was 0.52 seconds in the air.
Any substance on this earth is directly dependent on the gravitational force. The bullet fired horizontally will also faced the gravitational pull force.
To calculate the time the object takes to hit the ground, we use the following equation:-
\(t=\sqrt\frac{2y}{g}\)
The bullet is travelling in the air hence it does not depend on the velocity bt the mass. The height taken by the bullet is h=1.3m.
After putting the value to the equation, the answer will be as follows:-
\(t=\sqrt\frac{2*1.3}{9.8}\)
After solving the equation the value of time is 0.52 seconds
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A student observes a shadow move across the sun during a solar eclipse. Which list represents the position of Earth, the sun, and the
moon during this event?
A.sun, Earth, moon
B.moon, sun, Earth
C.Earth, sun, moon
D.sun, moon, Earth
The position of the Earth, Sun, and moon during the solar eclipse, a student observes a shadow moving across the sun is Sun, moon, Earth, so option D is correct.
What is a solar eclipse?When the Moon passes in front of the Sun, blocking all or part of Earth's view of it, a solar eclipse occurs. The Moon is closest to the plane of the Earth's orbit when there is a new moon and such an alignment. During a total eclipse, the Moon fully obscures the Sun's disk. Partial and annular eclipses only block out a section of the Sun. A solar eclipse occurs naturally. Solar eclipses were sometimes linked to supernatural sources or interpreted as an ill omen in several ancient and modern societies.
During a solar eclipse, the moon comes in between the earth and the sun therefore the shadow moves across the sun during a solar eclipse observed by the student, the position is Sun, moon, and earth.
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A bottle contains 3.75 L of soda. What percentage is left after 3.50 L is removed? A. 6.9% B. 6.7% C. 7.1% D. 0.93%
After removing 3.50 L of soda, approximately 6.7% of the original amount remains.
To calculate the percentage of soda remaining after removing 3.50 L, we can use the formula:
Percentage = (Remaining amount / Original amount) * 100
Given that the original amount of soda in the bottle is 3.75 L and 3.50 L is removed, we can calculate the remaining amount:
Remaining amount = Original amount - Removed amount
= 3.75 L - 3.50 L
= 0.25 L
Substituting the values into the percentage formula:
Percentage = (0.25 L / 3.75 L) * 100
≈ 0.0667 * 100
≈ 6.67%
Therefore, approximately 6.7% of the original amount of soda remains after 3.50 L is removed.
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What is an effect of continental drift?
Answer: An effect of continental drift is causing tectonic plates resting upon the convecting mantle to move which results in natural disasters like earthquakes, volcanic eruptions, and more.
A thief is running away from a scene and reaches a speed of 10 m/s in 5 seconds what is the thief acceleration
A. 2 m/s^2
B. 8 m/s^2
C. 18 m/s^2
D. 1 m/s^2
1) A current is induced by moving a magnet in and out of a coil of wire. What will happen to the induced current if you move the magnet twice as fast?
-Nothing, The induced current will not change.
-The induced current will decrease.
- The induced current will increase.
-The induced current will change directions.
2) A student connects a battery to a light bulb using wires, creating a closed simple circuit. The student connects an ammeter to the circuit and places a compass next to the wires. The student then decides to connect a second battery to the circuit. Which statement describes the changes that will occur after connecting the second battery?
- The compass will detect an increase in current, and the ammeter will detect a stronger magnetic field.
-The ammeter will detect an increase in current, and the compass will detect a weaker magnetic field.
-The ammeter will detect an increase in current, and the compass will detect a stronger magnetic field.
-The compass will detect an increase in current, and the ammeter will detect a weaker magnetic field.
3) A student is comparing a step-up transformer with a step-down transformer. Which data should she collect from each device?
- the ratio of incoming and outgoing voltages
- the ratio of the number of turns in the primary coils
-the ratio of incoming and outgoing currents
- the ratio of the number of turns in the secondary coils
4)What happens to a copper wire when it is moved across a magnetic field?
-Voltage and electric current are induced.
-Electric current is induced, but not voltage.
-It is attracted to the negative pole of the magnetic field.
-It is attracted to the positive pole of the magnetic field.
The induced current will increase if we move the magnet twice as fast.
Relationship of magnet's speed and induced currentWe know that an induced current is produced by a changing magnetic field. The greater the speed of the magnet, the greater the magnitude of the current so we can conclude that the induced current will increase if we move the magnet twice as fast.
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Answer:
The induced current will increase.
Explanation:
(310-15(B)(3)(a)(2)The ampacity of a conductor can be different along the length of the conductor. The higher calculated ampacity can be used if the length of the lower ampacity is no more than 10 feet or no more than 10 percent of the length of the circuit conductors.(True/False)
True, A conductor's ampacity can vary throughout its length due to factors such as ambient temperature, the number of conductors in a cable, and insulation type.
The National Electric Code (NEC) allows for the use of greater ampacity if the length of the lower ampacity portion is no longer than 10 feet or 10% of the length of the circuit conductors, whichever is shorter.
This provision is predicated on the idea that the heat created by the higher ampacity part will be dispersed across the length of the lower ampacity segment, resulting in no overheating or conductor damage.
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what is mercury barometer
Un motor realiza un trabajo de 5000 j en 20 s a) ¿ cual es la potencia del motor ?B)¿en cuanto tiempo desarollan el mismo trabajo una maquina de 15 w ?
Answer:
a. Potencia = 250 Watts
b. Tiempo = 333.33 segundos
Explanation:
Dados los siguientes datos;
Energía = 5000 Joules
Tiempo = 20 segundos.
Para encontrar el poder;
Poder = energía/tiempo
Potencia = 5000/20
Potencia = 250 Watts
B. ¿Para saber cuánto tarda una máquina en realizar el mismo trabajo;
Dado: potencia = 15 W
Tiempo = energía/poder
Tiempo = 5000/15
Tiempo = 333.33 segundos
When you encounter a new or frightening situation, your body launches a stress response commonly known as
When you encounter a new or frightening situation, your body launches a stress response commonly known as "fight-or-flight” response.
What is "fight-or-flight” response?This is referred to as a physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival.
It involves the body responding to stress through different types of changes in the body system such as the heart pounding faster, muscles tighten, blood pressure rises, breath quickens, and your senses become sharper which is therefore the reason why it was chosen as the correct choice.
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How does Juno’s orbit compare to the orbit of Jupiter’s moons?
Answer: This type of orbit has never been tried around Jupiter.
Explanation: Juno takes 11 days to complete a revolution while Jupiter takes only 10 hours to spin around once.
much like a battery these generate electricity from chemical events
The term you are looking for is "chemical battery". Chemical batteries work by converting chemical energy into electrical energy through a series of chemical reactions. These reactions take place within the battery's cells, which are composed of two electrodes and an electrolyte.
When the battery is connected to a circuit, the chemical reactions produce an electrical current that can be used to power devices. Chemical batteries are widely used in many applications, including consumer electronics, electric vehicles, and renewable energy systems. They are a crucial component of our modern technological society, and ongoing research is focused on developing more efficient and sustainable battery technologies to meet growing energy demands.
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The argument against your claim (what the other side would say if they disagreed with your claim.) is:
Group of answer choices
counterclaim
author's purpose
opinion
argument
Answer:
a counterclaim
Explanation:
authors purpose is what an author wrote somthing for
opinion is someones thoughts or "side" on a argument
an arguement is a battle of opinions if that makes sense