Answers
A. Mountain ranges linking in England and America
The theory of plate tectonics was promoted by the idea of continents drifting over time, which was proposed by Alfred Wegener. This concept was supported by evidence from fossils and rock formations, eventually leading to the development of the theory of plate tectonics.
Explanation:One idea used to promote the theory of plate tectonics is the concept of continents drifting over time. This idea was first proposed by Alfred Wegener in the early 20th century. He pointed out that the continents appeared to fit together like puzzle pieces, and he used evidence from fossils and rock formations to support his hypothesis of continental drift. Eventually, this idea led to the development of the theory of plate tectonics, which explains how the Earth's crust is divided into several plates that move and interact with each other.
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Related Questions
explain how a diode is like a one way street
Answers
In fact, a diode consists of a p-n junction, with a n-type region with excess of electrons and a p-type region with excess of holes. Both ends are connected to two terminals of a battery, so a voltage difference can be applied across the junction.
When no voltage is applied, electrons from the n-region combine with the holes from the p-region in the area near the junction, creating the so-called depleting region, which acts as an insulating area.
To get rid of this depleting area, the n-type region must be connected to the negative terminal of the battery while the p-type region to the positive terminal of the battery. This way, electrons from the n-region are repelled from the negative terminal and start to flow towards the positive terminal (and the holes do the same in the opposite direction), creating a net current flowing through the depletion region. Instead, when the n-type region is connected to the positive terminal of the battery, the electrons are attracted by that terminal, so they do not flow through the depletion region (and same for the holes in the p-region) and so there is no net current across the junction. Therefore, current in a diode flows only in one direction.
Which of the following best describes magnetic fields?
A. Magnetic fields need a conductor.
B. Magnetic fields are always found in insulators.
C. Magnetic fields have north and south magnetic poles.
D. Magnetic fields must have only positive charges.
Answers
Answer:
C
Explanation:
Because the north and the south pole are like the earth if they didn't attracted we would all die.
Magnetic fields have north and south magnetic poles. This statement best describes magnetic fields. So, option(C) is correct.
What is magnetic field?In the presence of a magnet, an electric current, or a shifting electric field, there is a vector field called a magnetic field where magnetic forces can be seen.
Electric charges in motion and the intrinsic magnetic moments of elementary particles connected to the fundamental quantum characteristic known as spin create a magnetic field.
As parts of the electromagnetic force, one of the four fundamental forces of nature, magnetic field and electric field are interdependent.
In magnetic field, there always be a north pole and a south pole because magnetic monopole doesn't exists. So, option (C) is correct.
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A person weighing 0.70 kn rides in an elevator that has an upward acceleration of 1.5 m/s2. what is the magnitude of the normal force of the elevator's floor on the person?
Answers
[tex]W=mg=0.70 kN=700 N[/tex]
And so
[tex]m= \frac{W}{g}= \frac{700 N}{9.81 m/s^2}=71.4 kg [/tex]
We know for Newton's second law that the resultant of the forces acting on the person must be equal to the product between the mass and the acceleration a of the person itself:
[tex]\sum F = ma[/tex]
There are only two forces acting on the person: his weight W (downward) and the vincular reaction Rv of the floor against the body (upward). So we can rewrite the previous equation as
[tex]R_v -W = ma[/tex]
We know the acceleration of the system, [tex]a=1.5 m/s^2[/tex] (upward, so with same sign of Rv), so we can solve to find the value of Rv, the normal force exerted by the elevator's floor on the person:
[tex]R_v = ma+W=(71.4 kg)(1.5 m/s^2)+700 N =807N[/tex]
The magnitude of the normal force of the elevator's floor on the person, given the person weighing 0.70 KN and the elevator accelerating upward at 1.5 m/s², is approximately 800 N.
Explanation:This problem falls under the domain of Physics, specifically involving Newton's laws and the concept of the normal force within the context of elevator motion. To address the scenario of a person weighing 0.70 KN riding in an elevator that is accelerating upward at 1.5 m/s2, we need to understand the person's experienced force, otherwise known as normal force.
The normal force can be calculated using Newton's Second Law, F=ma, and knowing that the normal force equals the weight plus the product of the mass and acceleration when the elevator is moving upwards. In this case, the person's weight on Earth is equal to the force of gravity on them; with gravity being roughly 9.8 m/s2, the person's mass (m) would be their weight (w) divided by gravity (g), giving m = 0.70 KN / 9.8 m/s2 ≈ 71.4 kg.
The normal force (Fn) on upwards acceleration is given by Fn = m*(g+a), where a is the acceleration of the elevator. Substituting the given figures for m, g, and a we find Fn = 71.4 kg * (9.8 m/s2 + 1.5 m/s2) =~ 800 N (rounded to the nearest integer). Therefore, the magnitude of the normal force of the elevator's floor on the person is about 800 N.
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What is one property of a wave that determines how much it will diffract when it encounters an obstacle?
-speed
-amplitude
-polarization
-wavelength
Suppose two waves collide, and the temporary combined wave that results is smaller than the original waves. What term best describes this interaction?
-diffraction
-destructive interfernce
-standing wave formation
-constructive interfernce
The formation of a standing wave requires
-the traveling of a wave for a long distance
-constructive interference between two waves of slightly different frequencies
-that refraction and diffraction occur at the same time in a wave
-interference between incoming and reflected waves
Answers
2) B-destructive interference
3)D -interference between incoming and reflective waves
Two vectors A and B have precisely equal magnitudes. In order for the magnitude of A+ B to be 110 times larger than the magnitude of A-B , what must be the angle between them?,
Answers
Due to the magnitudes, as mentioned in the problem, being equal, B has components Acos(θ)x along the x-axis and Asin(θ) along the y-axis.
The solution is as follows:
A+B has:
total x-component = A + Acos(θ) = A(1+cos(θ))
total y-component = 0 + Asin(θ) = Asin(θ)
Resultant = √[( A(1+cos(θ)))² + (Asin(θ))²]
= A√[1 + 2cos(θ) + cos²(θ) + sin²(θ)]
=A√[2 + 2cos(θ)]
A-B has:
total x-component = A - Acos(θ) = A(1-cos(θ))
total y-component = 0 - Asin(θ) = -Asin(θ)
Resultant = √[( A(1-cos(θ)))² + (-Asin(θ))²]
= A√[1 - 2cos(θ) + cos²(θ) + sin²(θ)]
=A√[2 - 2cos(θ)]
A+B/A-B = [A√[2 + 2cos(θ)]] / A√[2 - 2cos(θ)]
= [√[2 + 2cos(θ)]] / [√[2 - 2cos(θ)]]
110 = [√[1 + cos(θ)]] / [√[1 - cos(θ)]]
12100 = [1 + cos(θ)] / [1 - cos(θ)]
12100 - 12100cos(θ) = 1 + cos(θ)
12101cos(θ)] = 12099
cos(θ)= 0.999834724
θ = 1.04º
Immediately above the Sun's photosphere is the _______, which is the Sun's lower atmosphere
Immediately above the Sun's photosphere is the _______, which is the Sun's lower atmosphere.
A.
chromosphere
B.
solar wind
C.
corona
D.
core
Answers
The chromosphere is a thin layer of the atmosphere of the sun (or any other star) above the photosphere and below the corona. It consists mainly of hydrogen and helium.
This layer is very faint and reddish when it becomes visible, for a few seconds, at the beginning and end of a Solar eclipse and its appearance is not homogeneous.
Answer:
chromosphere
Explanation:
I got it right on study island
Work can _____ energy between objects and can cause a change in the form of energy.
A. Transfer
B. Change
C. Increase
D. Decrease
Answers
Answer:
Work can transfer energy between objects and can cause a change in the form of energy.
Explanation:
The best explanation can be done with an example.Consider an apple of mass m falling from a tree. Initially, the apple is at rest on the tree, at a certain height h above the ground, so it has a form of energy called gravitational potential energy, equal to: where g is the acceleration due to gravity.As the apple falls, the force of gravity acts on it, and so this force does work on the apple. As a result, the potential energy of the apple is converted into another form of energy, kinetic energy, which is the energy due to the motion of the apple: where v is the speed of the apple.Consider another example: a man pushing a box along the floor with a force F. The man is doing work on the box, and this work is equal towhere d is the displacement of the box. As a result of this work, some of the chemical energy contained in the muscles of the man is transferred into the box and converted to kinetic energy of the box, which is put in motion and it gains a certain speed v. In particular, if there are no frictional forces involved, the work done by the man is equal to the kinetic energy gained by the box.
Which consumes more energy, a 1.3 kw hair dryer used for 10 min or a 10 w night light left on for 24 hr?
Answers
energy consumed by hair dryer= 1300w x 60 x 10 =780000
energy consumed by night light = 10 x 24 x 60 x60 =864000
The 1.3 kW hair dryer consumes less energy than the 10 W night light. Calculations show that the hair dryer uses 0.2167 kWh, while the night light uses 0.24 kWh.
The 1.3 kW hair dryer used for 10 minutes consumes more energy compared to the 10 W night light left on for 24 hours. To calculate energy consumption, we use the formula: Energy = Power x Time. For the hair dryer: Energy = 1.3 kW x (10 min / 60 min) = 0.2167 kWh. For the night light: Energy = 10 W x 24 hours = 0.24 kWh. Therefore, the hair dryer consumes less energy.
The weight of a synthetic ball varies directly with the cube of its radius. a ball with a radius of 2 inches weighs 5.605.60 pounds. find the weight of a ball of the same material with a 3-inch radius.
Answers
[tex] \frac{m_3}{m_2}= \frac{(3 in)^3}{(2 in)^3} [/tex]
So we can find the weight of the ball when its radius is 3 inches:
[tex]m_3 = m_2 \frac{(3 in)^3}{(2 in)^3}= (5605.60 p) \frac{3^3}{2^3}=18919 pounds [/tex]
The ease with which a memory can be retrieved is influenced by all of the following EXCEPT
How well the person encodes the information
The importance of the information
The person's belief in the information
How well the person stores the information,
Answers
I hope this helps!
An ammeter can measure current upto 500mA. There are 20 equal division between 0 and 100mA mark on its scale. During an experiment to determine the equivalent resistance of the two resisters joined in parallel a student observes ammeter’s pointer at 3rd graduation mark after zero when the key is off and the pointer at the 17th graduation mark after 200mA when the key is inserted into the plug.The correct value of the current flowing in the circuit is
Answers
Our ammeter still measures some current, and this is called hysteresis error. This means that this particular ammeter is going to add some amount of current to any current measured. In order to compensate for this error, we simply we deduct it from all measurements.
Each mark on the ammeter is worth:
[tex]m=\frac{100mA}{20}=5mA[/tex]
This means that our error is:
[tex]e_r=3\cdot m=15mA[/tex]
When the circuit is closed we measure:
[tex]I_{er}=200mA+17\cdot m=285mA[/tex]
This is current with the error, real current in the circuit is:
[tex]I=I_{er}-e_r=285-15=270mA[/tex]
What is the transfer of energy to an object using a force that causes the object to move in the direction of the force?
a. movement
b. power
c. work
d. force?
Answers
[tex]w = f \times d[/tex]
*Work is measured in Joules.
Why does gravity pull things with mass toward it?
Answers
What are some possible sources of error when using the modified mercalli scale to locate the epicenter of an earthquake?
Answers
The Modified Mercalli scale is used measures the amount of damage done during an earthquake. This helps to locate the epicenter of the earthquake. It depicts the intensity of the earthquake based on the damage occurred due to the earthquake. The responses from many people who experienced the earthquake are collected by the scientists, assigned a value and plotted on a map
The plotted number can change with the reference place within the region of disturbance. It depends on the location of the observer with reference to the epicenter of the earthquake. The reporting depends on the witness. Some can exaggerate the extent of damage caused. All the above mentioned are possible sources of error when using the Modified Mercalli scale to locate the earthquake's epicenter.
Power can be expressed
1. in joules per watt, or in newtons per second
2. in joules per second, or in watts
3. in joules, or in newton-meters
Answers
Power in physics is the rate at which energy is transferred, correctly measured in joules per second or watts. Option 2
Power in physics is defined as the rate at which work is done or the rate at which energy is transferred. This rate is typically measured in joules per second (J/s), which is also known as a watt (W). To clarify the options provided in the question, power cannot be correctly expressed in joules per watt or newtons per second as these do not represent the rate of energy transfer.
Instead, power is correctly expressed in joules per second, which is equivalent to watts. For instance, a device like a light bulb that uses electrical energy to produce light and heat will have its power consumption rated in watts. The higher the wattage, the more power it consumes over a given period of time.
Additionally, power is sometimes measured in units such as the horsepower (hp), where 1 hp equals 746 watts. Furthermore, it is important to realize that terms like kilowatt-hour (kWh) are units of energy, not power. For instance, a 2000-watt iron would use 2 kWh of energy over one hour, which is equal to 2 x 3.6 million joules. Option 2
A tow truck exerts a force of 3000 n on a car, accelerating it at 2 meters per second per second. what is the mass of the car?
Answers
a bicyclist in the Tour De France crests a mountain pass as he moves at 15km/h. At the bottom 4km/h farther, his speed is 75km/h. What is his average acceleration(m/s^2) while riding down the mountain?,
Answers
[tex]2aS = v_f^2 -v_i^2[/tex]
where a is the acceleration, S the distance covered, vf the final speed and vi the initial speed.
Before using the formula, we need to convert everything into SI units.
The distance covered is:
[tex]S=4 km=4000 m[/tex]
To convert the speed from km/h to m/s, let's keep in mind that
[tex]1 km=1000 m[/tex]
[tex]1h=3600 s[/tex]
so
[tex]1 \frac{km}{h}= \frac{1000 m}{3600 s}= \frac{1}{3.6} [/tex]
is the conversion factor.
So the speeds are:
[tex]v_i = 15 km/h \cdot \frac{1}{3.6}=4.17 m/s [/tex]
[tex]v_f = 75 km/h \cdot \frac{1}{3.6}=20.83 m/s [/tex]
and so, now we can re-arrange the formula to find a, the average acceleration:
[tex]a= \frac{v_f^2-v_i^2}{2S} = \frac{(20.83m/s)^2-(4.17m/s)^2}{2\cdot 4000 m}=0.05 m/s^2 [/tex]
2. What happens when multiple forces act on an object? (Points : 1)
A. The object will always move.
B. The object will move if the forces are balanced.
C. The object will move if the forces are unbalanced.
D. The object will always stay in place.
3. An object moves in the direction of the __________ force. (Points : 1)
A. net
B. balanced
C. strongest
D. weakest
Answers
3. A. Net force.
Vector A??? has a magnitude of 2.00 m and vector B??? has a magnitude of 5.00 m. If the direction of each vector is unknown, what is the largest possible value for the magnitude of A??? ???B??? ?
Answers
and cooperation, and both push in exactly the same direction,
then they can team up to make a single vector of (2m + 5m) = 7m .
The largest possible magnitude of the two vectors A and B when added is the sum of their individual magnitudes, in this case, 7.00m. This occurs when the vectors are arranged in the same direction.
Explanation:In the field of Physics, particularly when dealing with vectors, the magnitude of the sum of two vectors (like A + B) can be at its biggest when the vectors are aligned in the same direction. In this case, the magnitudes, or lengths, of the vectors simply add up.
Here, you have one vector A, which has a magnitude of 2.00m, and another vector B, which has a magnitude of 5.00m. The largest possible magnitude of these two vectors when added (denoted by A + B) would be 2.00m + 5.00m = 7.00m. This happens when vectors A and B are in the same direction.
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Two charged parallel plates are 0.25 meters away from each other. The field between the plates is 600 . What is the electric potential difference?
Answers
V= Ed= 600×0.25= 150v
Answer:
150
Explanation:
edg 2022, electric potential difference assignment (slide 4/9)
How do elements form?
A) Through fusion in stars and supernova
B)Through the cooling of molten lava
C)Through the evaporation of seawater
D)Through chemical reactions
Answers
Answer:
A) Through fusion in stars and supernova
Explanation:
took the test and got it right
PLEASE HELP ME
In a vasectomy, which part of the anatomy is cut or tied off?
A. testes
B. vas deferens
C. urethra
D. seminal vesicles
Answers
The Vas deferens is a tube that carries the sperm from your testes to the urethra and out the body. A vasectomy is a form of birth control where the pathway of sperm is blocked through cutting or tying off the vas deferens. The word Vasectomy comes from the term Vas deferens.
Answer: Vas deference
Explanation: This is a method of contraception in uses a small surgical procedure. This method is a permanent method of contraception.
During this procedure, male vas deference are cut and tied together or we can say it is sealed to prevent the path of sperm from getting into the urethra and in this way it prevents fertilization of a females egg during the sexual intercourse.
What is the current in a series circuit with a resistance of 30 ohms and a potential difference of 120 volts?
Answers
If the cross-section of a wire of fixed length is doubled, how does the resistance of that wire change? (this is for studying for my semester exam. I got the question wrong on one of my chapter tests so I'm trying to find out what the correct answer was)
A. Halved
B. Doubled (I know it's NOT this cause that was the wrong one)
C. Unchanged
D. Quadrupled
Answers
Identify five main components of the atmosphere
Answers
Electric fields exist at a distance from two [blank] spheres.
a) magnetic
b) neutral
c)charged
Answers
To have an electric field you must have charged particles
Answer:
c)charged
Explanation:
A mixing blade on a food processor extends out 3 inches from its center. if the blade is turning at 600 revolutions per minute, what is the linear velocity of the tip of the blade in feet per minute? (round your answer to the nearest whole number.)
Answers
The length of the blade is 3 inches. Keeping in mind that 1 inc=0.025 m, we have
[tex]L=3 in \cdot 0.025 \frac{m}{inc} =0.075 m[/tex]
The angular speed is 600 revolutions per minute. Keeping in mind that [tex]1 rev=2 \pi rad[/tex] and [tex]1 min=60 s[/tex], the angular speed becomes
[tex]\omega = 600 \frac{rev}{min} \frac{2 \pi rad/rev}{60 s/min}=62.8 rad/s [/tex]
And so, the linear velocity of the edge of the blade is equal to
[tex]v=\omega L=(62.8rad/s)(0.075 m)=47 m/s[/tex]
Answer:
The linear velocity of the tip of the blade is 940.94 ft/min.
Explanation:
It is given that,
A mixing blade on a food processor extends out 3 inches from its center, r = 3 inches = 0.0762 meters
Angular speed of the blade, [tex]\omega=600\ rev/minute=62.83\ rad/s[/tex]
Let v is the linear velocity of the tip of the blade. The relation between the angular velocity and the linear velocity is given by :
[tex]v=r\times \omega[/tex]
[tex]v=0.0762\times 62.83[/tex]
v = 4.78 m/s
or
Since, 1 m/s = 196.85 ft/min
4.78 m/s = 940.94 ft/min
So, the linear velocity of the tip of the blade is 940.94 ft/min. Hence, this is the required solution.
30 points please help a girl out!
A political action group that wants to overturn the Montreal Protocol monitors stratospheric ozone across the South Pole over a 10-year period. They compare changes in the ozone layer to increases in the average global temperature and find no correlation. Because of this, they claim that ozone layer depletion is a myth. What is the major flaw in their reasoning?
a. Global warming is not observable at the South Pole.
b. Only tropospheric ozone will correlate to global warming.
c. The loss of stratospheric ozone is not connected to global warming.
d. The effects of the Montreal Protocol will not be fully realized until 2050.
e. Ten years is too short a time period for meaningful data to be acquired.
Answers
Answer:
i think it's b
Explanation:
The group incorrectly assumes that ozone layer depletion is connected to global warming when they are separate issues. Ozone depletion is about the loss of stratospheric ozone that protects from ultraviolet radiation, while global warming concerns the greenhouse gas effect and climate change.
Explanation:The major flaw in the reasoning of the political action group that wants to overturn the Montreal Protocol is c. The loss of stratospheric ozone is not connected to global warming. There is a common misconception that ozone layer depletion and global warming are directly related, but they are in fact separate phenomena resulting from different processes in the atmosphere. The ozone layer, consisting of ozone (O3) molecules, is crucial for absorbing harmful ultraviolet radiation from the sun and thereby protecting living organisms. The Montreal Protocol aimed to reduce the production and release of industrial chemicals like chlorofluorocarbons (CFCs), which were proven to contribute to ozone depletion. While the protocol led to a significant reduction in CFCs and a gradual recovery of the ozone layer, this effort is different from initiatives like the Kyoto Protocol, which address greenhouse gas emissions and aim to mitigate global warming.
The buoyant force on an object fully submerged in a liquid depends on (select all that apply)
Answer
1. the object’s mass.
2. the object’s volume.
3. the density of the liquid.
4. the mass of the liquid
Answers
3. The density of the liquid.
Remember what the buoyant force is. It's the lifting force caused by the displacement of a fluid. I'm using the word fluid because it can be either a liquid or gas. For instance a helium balloon floats due to the buoyant force exceeding the mass of the balloon. So let's look at the options and see what's correct.
1. Object's mass
* This doesn't affect the buoyant force directly. It can have an effect if the object's mass is lower than the buoyant force being exerted. Think of a boat as an example. The boat is floating on the top of the water. If cargo is loaded into the boat, the boat sinks further into the water until the increased buoyant force matches the increased mass of the boat. But if the density of the object exceeds the density of the fluid, then increasing the mass of the object will not affect the buoyant force. So this is a bad choice.
2. The object's volume.
* Yes, this directly affects the buoyant force. So this is a good choice.
3. The density of the liquid.
* Yes, this directly affects the buoyant force. You can drop a piece of iron into water and it will sink. You could also drop that same piece of iron into mercury and it will float. The reason is that mercury has a much higher density than water. So this is a good choice.
4. Mass of the liquid
* No. Do not mistake mass for density. As a mental exercise, imagine the buoyant force on a small piece of metal dropped into a swimming pool. Now imagine the buoyant force on that same piece of metal dropped into a lake. In both cases, the buoyant force is the same, yet the lake has a far greater mass of water than the swimming pool. So this is a bad choice.
The buoyant force on an object fully submerged in a liquid depends on the object's volume.and the density of the liquid.
What is buoyant force ?Buoyant force also known as upthrust, is an upward force exerted by a fluid that resists the weight of a partly or completely submerged object.
The weight of the overlying fluid causes pressure to rise with depth in a column of fluid.
The buoyant force on an object fully submerged in a liquid depends on the object's volume.and the density of the liquid.
Hence option 1 and 3 is correct .
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For precipitation to form, cloud droplets must grow in volume by roughly __________ times.
Answers
Hope I helped :)
The correct answer is by roughly one million times.
Any product of the condensation of atmospheric water vapor, which falls under gravity is known as precipitation. The main forms of precipitation are rain, drizzle, snow, sleet, and others.
All the precipitation give rise to clouds and the clouds are produced when water vapor in the atmosphere condenses and cools. With the condensation of water vapor, the formation of water droplets takes place, and if the formation of clouds takes place within or is moved into the part of the atmosphere, which is below freezing then the droplets turn into ice crystals.
In order to form precipitation, the cloud droplets must grow in volume by roughly one million times.