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.
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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Many of our behaviors are adopted as a product of our _____.
A TV shows
B radio
C environment
D friends
What is the current in a series circuit with a resistance of 30 ohms and a potential difference of 120 volts?
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?,
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
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
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?
Work can _____ energy between objects and can cause a change in the form of energy.
A. Transfer
B. Change
C. Increase
D. Decrease
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 activity involves using fossil fuels directly or indirectly? 1)eating fresh fruit for a snack 2)cooking hot dogs on a campfire 3)using crayons to color 4)walking to school
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.
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.
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
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
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
Identify five main components of the atmosphere
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.)
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.
A certain radio wave has a frequency of 2.0 x 10^6 Hz. What is its wavelength?
Can someone help me solve this??
Electric fields exist at a distance from two [blank] spheres.
a) magnetic
b) neutral
c)charged
Answer:
c)charged
Explanation:
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
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?,
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,
On a fishing trip, Rebecca catches a fish that she has never seen before. What characteristics should she look at to determine which of the three main groups of fish her catch belongs to? What would she find if the fish is a bony fish?
An element's atomic number is 16. How many electrons would an atom of this element have?
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
Answer:
A) Through fusion in stars and supernova
Explanation:
took the test and got it right
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?
Answer:
150
Explanation:
edg 2022, electric potential difference assignment (slide 4/9)
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??? ?
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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An automobile engine delivers 47.4 hp. how much time will it take for the engine to do 6.82 × 105 j of work? one horsepower is equal to 746 watts. answer in units of s.
What are some possible sources of error when using the modified mercalli scale to locate the epicenter of an earthquake?
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.
A piano tuner stretches a steel piano wire with a tension of 1000 n. the wire is 0.5 m long and has a mass of 5 g. what is the number of the highest harmonic that could be recorded by a computer that is capable of sensing frequencies up to 10,000 hz
Answer: 1. B) 720 N
2. D) 2500 m
3. D) 408 Hz
4. C) 4m
5. A) 246 hz
6. D) 31st
7. B) the frequency of the sound is 100 Hz
8. C) 0.78 m
9. B) 16 Hz
10. B) 311 m/s
For precipitation to form, cloud droplets must grow in volume by roughly __________ times.
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.
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.
A certain instant camera determines the distance to the subject by sending out a sound wave and measuring the time needed for the wave echo to return to the camera. how long would it take the sound wave to return to the camera if the subject were 3.42 m away? the speed of sound is 343 m/s. answer in units of s.
The time it would take for the sound wave to travel to a subject 3.42m away and back, with a sound speed of 343 m/s, is approximately 0.01995 seconds.
Explanation:The time it takes for the sound wave to return to the camera can be found by applying the equation distance = speed * time. This principle is often utilized in technologies such as sonar and ultrasound imaging. Here the distance is doubled since the sound has to travel to the subject and back to the camera. If the subject is 3.42 m away, the total distance covered by the sound wave is 3.42m * 2 = 6.84m. Given that the speed of sound is 343 m/s, we can rearrange the equation to solve for time: time = distance/speed. Hence, time = 6.84m / 343 m/s = 0.01995 s, rounded to 5 decimal places.
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It takes 0.02 seconds for the sound wave to return to the camera if the subject were 3.42 metres away.
The given question can be solved by simple use of kinematic equations. It is given that the camera determines the distance to the subject by sending out a sound wave. The speed of the sound wave is v = 343 m/s
Now, for a subject at a distance of 3.42 metres away the sound wave has to travel to the subject and travel back to the camera as well. Therefore the total distance covered by the sound wave will be twice the distance of the subject from the camera.
d = 2 × 3.42 m = 6.84 m
From the kinematic equation;
[tex]v = \frac{d}{t}[/tex], where t = time taken
rearranging for t, we get:
[tex]t = \frac{d}{v}[/tex]
substituting the values,
[tex]t = \frac{6.84 m}{343 m/s}[/tex]
or, t = 0.019 s ≈ 0.02 s
9. How does the length of the hypotenuse in a right triangle relate to the lengths of the legs? (2 points)
Open ended/Short answer question
Answer:
hypotenuse² = base² +height²
Explanation:
Let us suppose a right angled triangle having b as base, h as hypotenuse and p as perpendicular distance.
The relation between the length of legs, the base and the hypotenuse is called Pythagoras theorem. It is given by :
[tex]h^2=b^2+p^2[/tex]
or
hypotenuse² = base² +height²
Answer:
The relation between the length of the hypotenuse in a right triangle and lengths of the legs is [tex]H^{2} = p^{2}+b^{2}[/tex].
Explanation:
The legs of right angled triangle is also known as perpendicular and base respectively.
Let p be length of perpendicular and b be the length of base. Then by Pythagoras theorem,
[tex]H^{2} = p^{2}+b^{2}[/tex]
here, H is the length of Hypotaneous.
Thus, relation between the length of the hypotenuse in a right triangle and lengths of the legs is [tex]H^{2} = p^{2}+b^{2}[/tex].
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