How do MRIs physically work?
Answer:
An MRI scanner applies a very strong magnetic field
Explanation:
Magnetic resonance imaging (MRI) uses a superconducting magnet to create a strong magnetic field, causing hydrogen nuclei in the body to emit signals when subjected to a radio frequency current. These signals are interpreted by a computer to form detailed images of internal structures that differentiate between tissue types and provide information about organ function and health conditions.
How Do MRIs Physically Work?
MRI, or magnetic resonance imaging, is a technique that uses a combination of strong magnetic fields and radio waves to generate detailed images of the inside of the body. The largest part of the MRI unit is a superconducting magnet that creates a consistent magnetic field, usually between 1 and 2 Tesla (T) in strength. Within this field, hydrogen nuclei, which are abundantly found within the water in soft tissues, align with the magnetic field.
When a radio frequency current is briefly activated, it creates a varying electromagnetic field that causes these hydrogen protons to absorb energy and move out of their initial aligned position. Upon deactivating the radio frequency field, the hydrogen protons release the absorbed energy and realign with the magnetic field, emitting electromagnetic signals in the process. The emitted signals are picked up by sensors within the MRI machine and subsequently interpreted by a computer to create a highly detailed image that differentiates tissues based on their density and composition.
This process allows medical professionals to gain invaluable information about structures within the body, from the shape of vertebral disks to the condition of brain tissue. The different responses of normal vs. non-normal tissues to slight changes in the magnetic field also provide insights into organ function and the presence of medical conditions such as tumours, strokes, and infections. MRI imaging is a powerful tool that can track ions across membranes, detail anatomical structures, and monitor organ function without exposure to ionizing radiation.
Explain why a roller coaster’s second hill cannot be taller than the first hill.
The reason behind the second hill in the roller coaster not taller than the first hill is the frictional force acting on the roller coaster.
Explanation:
The height of the first hill in the roller coaster is taller with the decrease in the subsequent hills as the frictional forces reduces the kinetic energy.
Coming down the first tallest hill, the speed and kinetic energy both increases as the motion is in line with gravity, but due to conservation of energy, the potential energy decreases. And as the potential energy decreases, the height of hill has to be decreased in order to complete the motion.
What is the definition of ego?
a person's sense of self-esteem or self-importance.
PSYCHOANALYSIS
the part of the mind that mediates between the conscious and the unconscious and is responsible for reality testing and a sense of personal identity.
Ego is defined as oneself especially contradicted with another self in the world.
Explanation:
The Latin word for ‘I.’ is Ego. Ego is defined as oneself especially as contrasted with another self. Ego is related to meaning to the word conceit.
Some of the synonyms of the word ego are self-respect, pride, self-esteem. Ego is our conscious mind, which has the identity considering the "self." It results in pride feel which makes someone superior to others.
The focal point of a concave mirror is _____ the mirror. ( in front of; behind)
Answer:
in front of the mirror
Explanation:
Gravity acts on any two objects with mass anywhere in the universe
- "Gravity is a universal attraction between any two objects with mass. Every object in the universe is affected by the force of gravity. The two factors that affect the magnitude of gravity are the mass of the attracted objects and the distance between them. The greater the masses the greater the gravitational force between two objects."
Answer: True
Explanation:
Which direction do we NORMALLY expect our weather to come from in Enfield
Answer:
The direction of where the wind comes from normally in Enfield, Connecticut is from the southeast.
Hope this helps!! :)
In Enfield, we normally expect weather to approach from the west. This is due to the prevailing westerly winds that affect the weather patterns in the United Kingdom. Consequently, weather systems often move in from the Atlantic Ocean, which lies to the west of Enfield and the rest of the UK.
The predominant weather direction in Enfield is influenced by the larger atmospheric circulation patterns, specifically the westerly winds found in the UK's latitudinal zone. These winds are part of the global circulation system and are driven by the Earth's rotation and the temperature contrast between the equator and the poles. As a result, low-pressure systems, which generally bring cloudy and rainy conditions, commonly move from west to east due to these westerly winds. Understanding this pattern is crucial when describing the weather of Enfield at a specific time. Additionally, detailed weather forecasts for Enfield would take into account these prevailing winds and other local factors that might slightly alter this general west to east movement.
What is the energy equivalent of an object with a mass of 23 g
Answer:
0.207x10^16 Joules!
Explanation:
Using Einstein's law of mass energy, we know that the energy of a matter is:
E = mc^2
where, m [kg] = mass
c [m/s] = speed of light
In this case:
m=23g = 0.023kg.
c = 3×10^8m/s (This is an aproximation)
Then:
E = mc^2 = (0.023kg)(3×10^8m/s)^2 = 0.207x10^16 Joules!
The emission spectrum of the element lithium is shown below.
What is the best estimate of the color that will be seen when a sample of lithium gas absorbs a lot of energy?
mix of blue and green
mix of red and orange
mix of yellow and green
pure yellow
Answer:
mix of red and orange
Explanation:
The lithium emission spectrum indicates high intensity at the wavelength of 600nm to 700nm
In the visible light spectrum, colors that are in this range are;
Red=700 - 630 nm
Orange= 630 to 590nm
A sample of lithium gas that has absorbed a lot of energy will show a mix of red and orange colors
Answer:mix of red and orange
Explanation:
A wire carries a current of 10 amps in a direction of 90 degrees with respect to the direction of an external magnetic field of strength 0.3 tesla. What is the magnitude of the magnetic force on a 5m length of wire?
Answer:
15 N
Explanation:
The magnetic force on a piece of current-carrying wire is given by:
[tex]F=ILB sin \theta[/tex]
where
I is the current in the wire
L is the length of the piece of wire
B is the magnetic field strength
[tex]\theta[/tex] is the angle between the direction of B and I
In this problem:
I = 10 A
B = 0.3 T
L = 5 m
[tex]\theta=90^{\circ}[/tex]
Substituting into the equation, we find
[tex]F=(10 A)(0.3 T)(5 m) sin 90^{\circ}=15 N[/tex]
To calculate the magnetic force on a 5m wire carrying a 10 amps current in a 0.3 tesla magnetic field at a 90-degree angle, we use the formula F = IBL sin(θ). The result is a magnetic force of 15 Newtons.
The magnitude of the magnetic force on a 5m length of wire carrying a current of 10 amps and situated at a 90-degree angle with respect to the direction of an external magnetic field of 0.3 tesla.
To find the magnitude of the magnetic force, we use the formula F = IBL sin(θ), where F is the force, I is the current, B is the magnetic field strength, L is the length of the wire, and (θ) is the angle between the wire and the magnetic field.
Given that I = 10 A, B = 0.3 T, L = 5 m, and (θ) = 90 degrees (or \(\pi/2\) radians), the sine of 90 degrees is 1. Therefore, F = 10 A x 0.3 T x 5 m x 1 = 15 N.
The magnitude of the magnetic force on the wire is 15 Newtons.
How do the electrical patterns in electronics convey information?
With analog and electric signals
With analog and digital signals
With electric and thermal signals
With electric and digital signal
Answer:
Electronics convey information with electrical patterns called analog and digital signals.
Explanation:
A digital signal encodes information as a string of 1's and 0's. Pulsing a current on and off can produce a digital signal. When the current is off, it represents a 0.
A 2500-ohm is connected to a 110v power supply. What is the current through the resistor
Answer:
0.044 amps
Explanation:
Givens
R = 2500 ohms
E = 110 volts
I = ?
Equation
I = E/R
Solution
I = 110/2500
I = 0.044 amps
A force is acting on each of the objects below.
Answer:
D
Explanation:
The forces have the same magnitude (3N), but different directions. So they are different.
The magnitude and direction of the forces acting on the object indicates that the resultant forces are;
12) D.
13) A
14) B
15) A
What is a resultant force?A resultant force is the force obtained by adding together or summing the components of the forces acting at a point or location.
12) The magnitude and directions of the forces are;
3 N to the left
3 N downwards
3 N To the right
A force is a vector quantity that has both magnitude and direction, therefore, the forces are different because their directions are different. The correct option is therefore option D.
13) The force of one student is 200 N to the right and the force of the other student is 150 N to the left, therefore;
The resultant force is the sum of the two forces. Taking the right direction as the positive direction, we get;
The resultant single force is; 200 N + (-150) N = 50 N
The resultant force is 50 N. The correct option is option A
14) When the force of gravity is equivalent to the force of the air resistance holding the ball, we get;
The resultant force = 0 N
Force = Mass × Acceleration, therefore;
Mass × Acceleration of the ball = 0
The mass of the ball is not zero, therefore, the acceleration of the ball is zero and the ball is falling at a constant speed. The correct option therefore is option B.
15. The forces acting on the box are;
20 N to the right and 30 N to the left
40 N downwards and 10 N upwards
The resultant force will therefore be; 20 - 30 = -10 which is 10 N to the left and 10 - 40 = -30, which is 30 N downwards
The box will increase in speed downwards and to the left, which corresponds to option A
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in an inverse relationship, when one variable increases, the other blank
Answer:
Decreases
Explanation:
Given the relationship: a=k/b where k is a constant and a and b are variables, we can now evaluate the relationship.
Increasing a means that b has to reduce for the relationship to stand.
Lets say, a=2 b= o.5 and k =1
These values satisfy the argument.
When we increase a to 4, then we get:
4=1/b
our new b will be= 1/4 or o.25
Thus an increase in one variable leads to a decrease in in the other variable.
How do simple machines make work easier? A. They decrease the power available. B. They maintain the distance of a force. C. They apply force quickly. D. They change the strength or direction of a force.
Answer:
C or D I would think
Explanation:
Answer:
the answer is d
Explanation:
Jenny is very nervous about giving her speech, and when she stands up in
front of the class, she stutters and does a poor job. This is an example of:
Answer:
Stage fright
Explanation:
Stage fear is one that a person experiences when he feels exposed to what others are going to say. This feeling is characterized by the fear of public speaking. Some common causes are large crowds or stress associated with an important presentation where people can stutter and do a poor job.
Answer:
social impairment
Explanation:truuuust
What force (in newtons) is required to accelerate a body with a mass of 32 kilograms at a rate of 12 m/s2?
Answer:
384 N
Explanation:
Newton's second law:
∑F = ma
F = (32 kg) (12 m/s²)
F = 384 N
Answer:
F=384 N
Explanation:
F=ma
F = 32 kg × 12 m/s2
F = 384 N
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what is the acceleration of a body moving with a velocity of 30 m/s in a circle of radius 10 m
if the body is moving in a circle, then it moves with a centripetal acceleration and it is given by,
a=v^2/r
where, velocity(v)=30m/s
radius(r)=10 m
so a=30^2/10=90m/s^2
The body that is moving in a circle with a constant velocity of 30 m/s and radius of 10m has a centripetal acceleration of 90 m/s².
Explanation:The student is inquiring about the acceleration of an object moving in a circle, specifically a body moving with a constant velocity in a circular path. This is a question of circular motion in Physics.
The acceleration of a body moving in a circle is called centripetal acceleration. It's directed towards the center of the circle. In Physics, the formula to calculate centripetal acceleration (ac) is:
ac = v^2/r
where:
v is the velocity of the body, andr is the radius of the circle.In this scenario, the body is moving with a velocity (v) of 30 m/s and the radius (r) of the circle is 10 m. Using the above formula, the acceleration would be:
ac = 30^2 / 10 = 900 / 10 = 90 m/s²
The body has a centripetal acceleration of 90 m/s².
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Which result in an increase in power
Answer:
doing more work in less time?
Explanation:
Answer:
more work n less time
Explanation:
10. the discovery by nikola tesla that out-of-phase alternating currents caused _________ is considered one of the 10 greatest scientific discoveries.
A.) motivation
B.) circulation
C.) rotation
I think that the answer is C but give me a minute to make sure I’m correct
the discovery by Nikola tesla that out-of-phase alternating currents caused rotation is considered one of the 10 greatest scientific discoveries.
What is current ?A movement of charged particles, such as electrons or ions, through an electrical conductor or a vacuum is known as an electric current. The net rate of electric charge flow through a surface is how it is described Charge carriers, which can be any of a number of particle kinds depending on the conductor, are the moving particles. Electrons flowing over a wire are frequently used as charge carriers in electric circuits. They can be electrons or holes in semiconductors. Ions are the charge carriers in an electrolyte, whereas ions and electrons are the charge carriers in plasma, an ionized gas.
The passage of electric charge across a surface at a rate of one ampere is the SI unit for electric current.
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Select the correct answer.
The table shows the specific heat of four substances—brick, dry soil, paper, and water. If all four substances were exposed to sunlight for the same amount of time, which substance would heat up the fastest?
brick 0.9
dry soil 1.26
paper 1.336
water 4.18
A.
brick
B.
paper
C.
dry soil
D.
water
Answer:
The brick would heat up the fastest.
Explanation:
Bricks are thick but they absorb sunlight at an alarming rate.
A. brick
What is specific heat capacity?
In thermodynamics, the specific heat capacity of a substance is the heat capacity of a sample of the substance divided by the mass of the sample, also sometimes referred to as massic heat capability.
specific heat is the amount of energy, measured in joules, needed to increase the temperature of 1 gram of the substance by one Celsius degree. often carried out to metallic elements, specific heat can be used as a basis for comparing how different materials absorb and transfer energy.
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Do people use uranium for anything?
Answer:
kjlp;;
Explanation:
Answer:
uranium gets used in bombs
Explanation:
Assuming that the acceleration due to gravity is 32.2 ft/s2 and air resistance is negligible, a projectile is launched at 56° above the horizontal with an initial velocity of 36 ft/s. The launch and landing sites are at the same elevation.
What is the projectile’s range?
Answer:
37 ft
Explanation:
First find the air time:
y = y₀ + v₀ᵧ t + ½ gt²
0 = 0 + (36 sin 56°) t + ½ (-32.2) t²
0 = 29.8 t - 16.1 t²
0 = t (28.8 - 16.1 t)
t = 1.85 s
Now find the range:
x = x₀ + v₀ t + ½ at²
x = 0 + (36 cos 56°) (1.85) + ½ (0) (1.85)²
x = 37.3 ft
Rounded to two sig-figs, the range is 37 feet.
The range of a projectile launched at an angle of 56° above the horizontal with an initial velocity of 36 ft/s, neglecting air resistance and considering that the launch and landing sites are at the same elevation, is approximately 129.17 ft.
Explanation:In Physics, the range of a projectile launched at an angle can be calculated with the following equation: Range = (v² sin 2θ )/ g where v is the initial velocity, θ is the launch angle, and g is the acceleration due to gravity.
In this case, v = 36 ft/s, θ = 56°, and g = 32.2 ft/s². Converting the angle from degrees to radians gives us θ = 56° × π/180 = 0.977 radians.
Plugging in the values and using the sine of double the angle, we have: Range = (36 ft/s)^2 sin(2 * 0.977 rad) / 32.2 ft/s² = 129.17 ft.
So, the range of the projectile, assuming negligible air resistance and the launch and landing sites are at the same elevation, is approximately 129.17 ft.
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13. opposite poles of two magnets are attracted to each other due to ________.
A.) electricity
B.) magnetism
C.) electromagnetism
D.) none of these
I believe that
B. Magnetism
Is the answer
magnetism is the right answer
how are electromagnets and bar magnets alike and how are they different ?
An electromagnet is made from a coil of wire which acts as amagnet when an electric current passes through it. Often anelectromagnet is wrapped around a core of ferromagnetic material like steel, which enhances the magnetic field produced by the coil.
Electromagnets and bar magnets have similar characteristics with north and south poles, but differ in that electromagnets need a power supply while bar magnets are permanent.
Electromagnets and bar magnets share similarities such as having north and south poles that attract and repel each other. They both produce a magnetic field around them.
However, electromagnets require an external power supply to generate a magnetic field, while bar magnets are permanent magnets that do not need an external power source.
Which type of electromagnetic waves have longer wavelengths that the waves that make up visible light.
Answer:
radiation
Explanation:
Answer:
radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, gamma rays
Explanation:
Minerals ____.
A. Can be gases
B. Must be inorganic
C. Can’t be compounds
D. Are the same as rocks
Answer:
Neither. But I guess, if you look at it this way, they make up rocks... so I guess D is probably the most likely answer of those options. Hope this helps.
an orifice tube is located
an orifice tube is located within the tube between the condenser & the front evaporator
Can I get help and an explanation on C?
Answer:
1.67 m/s
Explanation:
Momentum is conserved.
Initial momentum = final momentum
(30 kg) (10 m/s) + (35 kg) (-10 m/s) = (30 kg) v + (35 kg) (0 m/s)
300 - 350 = 30v
v = -5/3 m/s
Linus will move at 1.67 m/s in the direction opposite that he started.
All of the noble gases, Group 18, have eight valence electrons in its outer shell (excluding helium which only has two).
Which of these would represent the oxidation number of the noble gases such as xenon and argon?
A) -8
B) -2
C) 0
D) +8
C) 0 cause it’s a stable reaction
Answer:
C 0
Explanation:
Its an unstable reaction
_____ interference occurs when two waves are in phase.
Answer:
constructive interference
Explanation: