The new intensity, when 69 kV is used while keeping the mAs constant, is approximately 3,174 mGya.
To find the new intensity in mGya (milligrays) when the kilovoltage (kV) is changed while keeping the milliampere-seconds (mAs) constant, we can use the inverse square law. The equation for the inverse square law is:
I₂ = I₁ * (D₁/D₂)²
Where:
I₁ is the initial intensity
I₂ is the new intensity
D₁ is the initial distance (which is not given in this case)
D₂ is the new distance (which is assumed to be constant in this case)
Since the mAs is constant, we can ignore the effect of distance (D) in this case.
Using the inverse square law equation, we can calculate the new intensity (I₂) in mGya:
I₂ = I₁ * (kV₂/kV₁)²
Converting the units:
240 mR = 240 * 0.01 Gy = 2.4 Gy
1 Gy = 1,000 mGy
Substituting the given values:
I₂ = 2.4 Gy * (69 kV / 60 kV)²
I₂ ≈ 2.4 Gy * (1.15)²
I₂ ≈ 2.4 Gy * 1.3225
I₂ ≈ 3.174 Gy
Converting the result back to mGya:
3.174 Gy = 3.174 × 1,000 mGy
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Are two atoms of the same element identical?
Answer:
Nope
Explanation:
No. Two atoms of the same chemical element are typically not identical. First of all, there is a range of possible states that the electrons of an atom can occupy. Two atoms of the same element can be different if their electrons are in different states.
Wheels Accelerated by Hanging Weight Lab
• Lab Objective: Using Newton's Second Law for rotation to experimentally determine the rotational inertia of bicycle wheels.
• We can derive the rotational inertia of uniform objects using the definition of rotational inertia: For non-uniform shapes such as bicycle wheels, this method is difficult. In the videos provided, different bicycle wheels are accelerated by a weight suspended from a string wrapped around the rim of the wheel. How can we use these videos (and interactable tools included) to experimentally determine the rotational inertia of these bike wheels?
All answers are given below.
What do you mean by inertia?Inertia is the tendency of an object to remain in its state of motion, whether it be at rest or in uniform motion in a straight line, unless acted upon by an external force. It is a fundamental concept in classical physics, described by Isaac Newton's first law of motion, and is related to an object's mass. The greater an object's mass, the greater its inertia, making it harder to change its motion.
The rotational inertia of the bicycle wheel can be experimentally determined by using Newton's Second Law for rotation. The Second Law states that the net torque acting on an object is equal to the rate of change of its angular momentum, or:
Στ = Iα
where Στ is the net torque, I is the rotational inertia of the object, and α is the angular acceleration.
In the case of the bicycle wheel, the hanging weight provides the net torque, and the rotational inertia can be determined by measuring the angular acceleration of the wheel. To do this, you can use the following steps:
Measure the mass of the hanging weight and the radius of the wheel.
Suspend the weight from a string wrapped around the rim of the wheel.
Measure the angular acceleration of the wheel by using an angular velocity sensor or by measuring the time it takes for the wheel to complete a certain number of revolutions.
Substitute the measured values into the equation: Στ = Iα and solve for the rotational inertia I.
Repeat the experiment with different weights and/or different radii to determine the relationship between the rotational inertia and the mass and radius of the wheel.
Using the videos and interactable tools provided, you can visualize and experiment with different scenarios to determine the rotational inertia of the bicycle wheel. This method allows you to experimentally validate the relationship between rotational inertia, mass, and radius, and to gain a deeper understanding of the physics of rotational motion.
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hewo (´▽`ʃ♡ƪ)
if u report your a b/i/t/c/h
Answer:
hai >.<
Explanation:
Answer:
hello!
Explanation:
~evita
A 72 kg man stands on a bathroom scale inside an elevator.
a. The elevator accelerates upward from rest at a rate of 1.30 m/s2 for 1.50 s. What does the scale read during the 1.50 s interval?
b. The elevator continues upward at constant velocity for 8.50 s. What does the scale read now?
c.While still moving upward, the elevator's speed decreases at a rate of 0.500 m/s2 for 3.00 s. What is the scale reading during the time?
a. During the upward acceleration, the net force acting on the man is the force due to gravity (weight) plus the force exerted by the elevator (normal force), which can be expressed as:
Fnet = ma
Fnet = (72 kg)(1.30 m/s^2) = 93.6 N
The normal force exerted by the scale is equal in magnitude to the force due to gravity, so:
Fnormal = mg
Fnormal = (72 kg)(9.81 m/s^2) = 706.32 N
The scale reading is the magnitude of the normal force, which is:
scale reading = Fnormal = 706.32 N
b. During the constant velocity motion, the elevator is not accelerating, so the net force acting on the man is zero. Therefore, the normal force exerted by the scale is equal in magnitude to the force due to gravity:
Fnormal = mg
Fnormal = (72 kg)(9.81 m/s^2) = 706.32 N
The scale reading is the magnitude of the normal force, which is:
scale reading = Fnormal = 706.32 N
c. During the upward deceleration, the net force acting on the man is the force due to gravity (weight) minus the force exerted by the elevator (normal force), which can be expressed as:
Fnet = ma
Fnet = (72 kg)(-0.500 m/s^2) = -36 N
The normal force exerted by the scale is now less than the force due to gravity, so:
Fnormal = mg - Fnet
Fnormal = (72 kg)(9.81 m/s^2) - (-36 N)
Fnormal = 760.32 N
The scale reading is the magnitude of the normal force, which is:
scale reading = Fnormal = 760.32 N
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Incoming solar radiation reaches the earth as visible (mostly yellow) light. After being absorbed by the Earth’s surface (heating it), this energy is radiated by the Earth at what wavelength of the electromagnetic spectrum of radiation (the answer is a single word, not a number)____
Answer:
Infrared
Explanation:
Infrared radiation is the form of light that is invisible to eye but can be felt as warmth.
Electromagnetic radiation has gamma rays, ultraviolet rays, x- rays , visible light and infrared radiation, etc.
The heated surface usually emits infrared radiations .They form a continuous spectrum.
Infra red radiation are used in different processes such as heat sensors, thermal imaging and night vision equipment.
Broadly they can be divided into three group near, middle and long infrared radiations.
These radiations can be seen with the eyes with special equipment or under certain conditions.
Which statements are true? [ Particles of different masses have the same average speed at & given temperature, II: The larger molecule, the slower it will effuse_ III. In real gases, the corrected volume is less than the ideal volume predicted by the ideal gas law. IV. For & given gas, the lower the temperature; the faster it will effuse. and IV III and IV 8 I, II and IV I[ and II L,I and III
The statements that are true are II: The larger the molecule, the slower it will effuse and III: In real gases, the corrected volume is less than the ideal volume predicted by the ideal gas law.
Which statements are correct regarding the relationship between particle masses and average speed, the effusion of larger molecules, and the volume of real gases?Statement I, "Particles of different masses have the same average speed at a given temperature," is false. According to the kinetic theory of gases, at a given temperature, particles of different masses will have different average speeds. Lighter particles tend to have higher average speeds compared to heavier particles.
Statement II, "The larger the molecule, the slower it will effuse," is true. Effusion refers to the escape of gas molecules through a small opening. Larger molecules have a lower average speed due to their greater mass, resulting in slower effusion rates compared to smaller molecules.
Statement III, "In real gases, the corrected volume is less than the ideal volume predicted by the ideal gas law," is true. Real gases deviate from ideal behavior at high pressures and low temperatures. This deviation is accounted for by corrections such as the van der Waals equation, which adjusts the predicted volume to account for intermolecular forces and molecular size.
Statement IV, "For a given gas, the lower the temperature, the faster it will effuse," is false. The rate of effusion is inversely proportional to the square root of the molar mass of the gas, but it is not directly dependent on temperature.
In summary, statements II and III are true, while statements I and IV are false.
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Instructions: Answer the following questions in the space provided. Be sure to write your responses in complete sentences.
A father pushes his daughter and son on a sled down a hill.
Part A: Other than the force exerted by the father pushing the sled, identify two additional forces that act on the sled as it travels from the top of the hill to the bottom. (2 pts)
Part B: Explain how each force you identified in Part A will affect the motion of the sled. (2 pts)
(A) The two additional forces that act on the sled as it travels from the top of the hill to the bottom are friction force and weight of the children.
(B) The force of friction is opposing the motion while the weight of the children is assisting the downward motion.
What are the forces exerted on the sled?
The forces that act on the sled as it travels from the top of the hill to the bottom with either aid the downward motion or oppose the downward motion.
The forces acting on the sled include the following;
the force applied by the fatherthe weight of the children acting normal to the surface of the sledthe force of friction acting upwards to oppose the downward motionThe weight of the children is acting downwards and it will increase the motion downwards since there in the same direction.
The force of friction between the surface of the sled and the hill will oppose the downward motion of the children as the father exerts the downward force.
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Two bullets of equal mass are shot at equal speeds at blocks of wood on a smooth ice rink. One bullet, made of rubber, bounces off the wood. The other bullet, made of aluminum, burrows into the wood. In which case does the block of wood move faster?
The momentum of the bullet and the block of wood is conserved. However, the bullet made of rubber bounces off the block of wood, which means that it changes direction and loses some of its momentum.
On the other hand, the bullet made of aluminum burrows into the wood and transfers its momentum to the block. Therefore, the block of wood moves faster in the case where the aluminum bullet burrows into it.
In the scenario where two bullets of equal mass are shot at equal speeds at blocks of wood on a smooth ice rink, the block of wood will move faster when the rubber bullet bounces off the wood.
Here's a step-by-step explanation:
1. Both bullets have equal mass and are shot at equal speeds.
2. The rubber bullet bounces off the wood, transferring more of its momentum to the block of wood.
3. The aluminum bullet burrows into the wood, transferring less of its momentum to the block of wood since it remains embedded in the wood.
4. According to the conservation of momentum principle, the block of wood that receives more momentum will move faster.
5. Since the rubber bullet transfers more momentum, the block of wood hit by the rubber bullet will move faster.
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A hair dryer uses 1100 W of power
when connected to a 110 V outlet.
What is the resistance of the hair
dryer?
Answer:10
Explanation:acellus
a fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. the thrust of its engines is 1.80 105 n. in being launched from rest it moves through a distance of 87 m and has a kinetic energy of 4.30 107 j at lift-off. what is the work done on the jet by the catapult?
A fighter jet being launched from such an aircraft carrier using a steam-powered catapult and its own engines. Its engines produce 2.3 x 105 N of thrust.
What speed is reached when a jet fighter aircraft is fired from a slingshot on an aircraft carrier?
42 m/s On an aircraft carrier, a catapult is used to launch a jet fighter. Just at end of the sling, it takes 2 seconds to achieve velocity of 42 m/s. What is the catapult's length if the acceleration is constant?
How strong is the aircraft carrier's catapult?
Catapults A 48,000-pound aeroplane was launched 300 feet and increased in speed from 0 to 165 miles an hour in two seconds by four steam-powered catapults. On every
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Barry walks from one end to the other of a 30-meter long moving walkway at a constant rate in 30 seconds, assisted by the walkway. When he reaches the end, he reverses direction and continue walking with the same speed, but this time it takes him 120 seconds because he is traveling against the direction of the moving walkway. If the walkway were to stop moving, how many seconds would it take Barry to walk from one end of the walkway to the other
Answer:
Δt=48 s
Explanation:
v: Barry's speed
v.: speed of the walkway
Δx=30 m
Δt1=30 s , Δt2=120 s
|Δx1|=|Δx2|
Δx=v*Δt
=> (v+v.)*30=(v-v.)*120
v=v.*5/3
30=(v+v.)*30
=> 30=(5v./3 +v.)*30
v.=3/8 m/s
v=5v./3 , v.=3/8
=> v=5/8 m/s
Δx=v*Δt
30=5/8 *Δt
Δt=48 s
the velocity of a body is increases from 10 m/s ti 15 m/s in 5seconds calculate its acceleration
Answer:
acceleration = v-u/ t
= 15-10/5
= 5/5
= 1 m/s2
Explanation:
hope this helped you.
Answer:
\(\boxed {\boxed {\sf 1 \ m/s^2}}\)
Explanation:
Acceleration is the change in velocity over the change in time. Therefore, the formula for calculating acceleration is:
\(a= \frac{v_f-v_i}{t}\)
Since the body's velocity increased from 10 meters per second to 15 meters per second 15 m/s is the final velocity and 10 m/s is the initial velocity. The time is 5 seconds.
\(v_f\)= 15 m/s \(v_i\)= 10 m/s t= 5 s\(a= \frac{ 15 \ m/s - 10 \ m/s}{5 \ s}\)
Solve the numerator.
15 m/s - 10 m/s = 5 m/s\(a= \frac{ 5 \ m/s }{5 \ s}\)
Divide.
\(a= 1 \ m/s/s\)
\(a= 1 m/s^2\)
The acceleration is 1 meter per second squared.
The hubble telescope has helped confirm what about the universe?.
Answer:
Helped pin down the age for the universe now known to be 13.8 billion years, roughly three times the age of Earth. Discovered two moons of Pluto, Nix and Hydra. Helped determine the rate at which the universe is expanding. Discovered that nearly every major galaxy is anchored by a black hole at the centre.
Explanation:
how to find total internal reflection
(c) Total internal reflection occurs
when the incident angle is greater than the critical angle.
n1 sin θ1 = n2 sin θ2. n1 sin θ1 = n2.hope it helpsWhich two pairs of labeled stars (A-G) in the diagram have the same temperature?
Answer:
Please find the graph file in the question:
Explanation:
The D and E will be having the same temperature as they lie on the same line drown from the temp axis if it was drawn.
During your European vacation, you are hanging out at the beach at the gold coast of Spain. As you are laying in your chaise lounge soaking up the warm Mediterranean sun, a large glob of seagull poop hits you in the face. You are able to estimate the impact velocity at 98.5 m/s. Calculate how high up the seagull was flying when it pooped. 10^2 for acceleration of gravity. SHOW YOUR WORK
A large glob of seagull poop hits you in the face. You are able to estimate the impact velocity at 98.5 m/s. The vertical component is something less than 98.5 m/s, and that the attack was launched from an altitude less than 494 m.
What do you mean by an acceleration ?The term acceleration is defined as any process where the velocity changes. So, velocity is a speed and a direction, there are only two ways for you to accelerate are change your speed or change your direction or change both.
98.5 m/s = √ [ (horizontal component)² + (vertical component)² ].
The vertical component = (9.8 m/s²) x (drop time).
Therefore, we're looking for the altitude of launch,
we can use the formula for 'free-fall distance' as a function of acceleration and time as follows:
Height = (1/2) (acceleration) (time²) .
Time = (98.5 m/s) / (9.81 m/s²)
= 10.04 seconds
Height = (1/2) (9.81) (10.04)²
= (4.905 m/s²) x (100.8 sec²)
= 494.43 meters.
Thus, the vertical component is something less than 98.5 m/s, and that the attack was launched from an altitude less than 494 m.
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How do you increase the potential energy between two south magnetic
poles?
Answer:
A south pole of one magnet can approach the north pole of another. The magnetic fields are aligned. This makes an attractive force between the two magnets. The farther apart they are, the higher their potential energy.
a computer's power supply converts mains ac to low-voltage regulated dc power for the internal components of a computer. you are building a new computer. you are deciding which type of power supply to install. which of the following definitions best describes a valid type of power supply?
In order to prevent overloading of any circuit, dual rail electrical supply includes independent tracks and P C B traces that are used to offset voltage sags between various circuits.
Using conductive paths, tracks, or signal traces etched from copper sheets laminated onto a non-conductive substrate, a printed circuit board, or PCB, is used to mechanically support and electrically link electronic components.
Semiconductors are used by practically all inverters to generate a controlled power output. An input voltage is rectified if the source has an ac input.
It is, therefore, the proper response.
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If ocean water did not move it would be hot in the _ region and frigid in the _ region
If ocean water did not move, it would be hot in the equatorial region and frigid in the polar regions.
Ocean currents are responsible for redistributing heat around the planet. Without these currents, the equatorial region would receive more sunlight and heat than it loses, resulting in an accumulation of heat in the water. On the other hand, the polar regions would lose more heat than they receive, resulting in frigid temperatures.
The rotation of the Earth also influences the movement of ocean water through the Coriolis effect. Without this effect, ocean currents would be less predictable, and their impact on climate and temperature distribution would be more severe. Therefore, ocean currents play a crucial role in regulating Earth's climate, and their disruption could have significant consequences for both marine life and global weather patterns.
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the homogenvity of s=ut+1/2at^2
how does the material type affect the descent of the parachute?
The type of material has two effects on the parachute. The lighter the parachute, the slower it will descend. The heavier the parachute, the faster it will fall.
The parachute is slowed down by air resistance due to the material's big surface area. More air resistance and a slower parachute descent result from a larger surface area.
Since, the material affects how the parachute descended, it is essential that it be windproof, flexible, and light-weight. It must be able to resist environmental factors like high-altitude winds. While it takes longer to descend with lighter materials, it takes less time to descent with heavier ones. The material is basically chosen to be lighter or less heavy for this purpose.
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a source of light is in a medium with an index of refraction of 1.91. if the medium on the other side of the surface has an index of 1.70, what is the critical angle?
The critical angle is approximately 62.9 degrees.
To find the critical angle, we can use Snell's law, which states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the indices of refraction:
sin(θi)/sin(θt) = n2/n1
where θi is the angle of incidence, θt is the angle of refraction, n1 is the index of refraction of the first medium (in which the light is initially traveling), and n2 is the index of refraction of the second medium (towards which the light is refracted).
The critical angle occurs when the angle of refraction is 90 degrees, which means that sin(θt) = 1. Therefore, we can rearrange the equation above to solve for the critical angle:
sin(θc) = n2/n1
where θc is the critical angle.
Plugging in the given values, we get:
sin(θc) = 1.70/1.91
sin(θc) ≈ 0.890
Taking the inverse sine of both sides, we get:
θc ≈ 62.9 degrees
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how many elements are pictured a.7 b4 c.3 d2
The number of elements pictured in the above image is 3 (option C).
What are elements?Element are any one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.
There are about 118 chemical elements, each with its own type of atom. Everything in the universe contains the atoms of at least one or more elements. The periodic table lists all the known elements, grouping together those with similar properties.
According to this question, elements are represented by different colours. Each colour represents each element.
The three colours are as follows:
Red Blue BlackThis means that there are three elements in the above image.
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Electric current can be measured. It is a rate. What does that mean?
Question 3 options:
The amount of current that passes a certain point in a certain amount of time
The amount of energy available that could be used
The strength of power used by something plugged into a wall
How bright a light will burn when plugged in
Answer:
a
Explanation:
cuz im smart ;)
An object accelerates 12.0 m/s² when a force of 6.0 newtons is applied to it.
What is the mass of the object
Answer:
0.5 kgExplanation:
The mass of the object can be found by using the formula
\(m = \frac{f}{a} \\ \)
f is the force
a is the acceleration
From the question we have
\(m = \frac{6}{12} = \frac{1}{2} \\ \)
We have the final answer as
0.5 kgHope this helps you
m = f/a
6 / 12 = 0.5
answer - 0.5
What do the three variables (f,m, a) in the equation mean?
Answer:
f=force m=mass and a=acceleration
What value of resistor R gives the circuit in the figure a time constant of 22 μs ?
The value of resistor R that gives the circuit in the figure a time constant of 22 μs is 220 Ω.
The circuit that is in the figure is shown below:Given that time constant (RC) = 22 μs. To find the value of resistor R, we need to use the formula for the time constant:
RC = τ, where R is the resistance and C is the capacitance of the circuit.
Rearranging the above formula, we get:R = τ / C
Where τ is the time constant and C is the capacitance of the circuit.
From the figure, the capacitance is given as 0.1 μF
.Substituting the values of τ and C in the above formula, we get:
R = (22 × 10⁻⁶ s) / (0.1 × 10⁻⁶ F)
R = 220 Ω
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3. Rock A is thrown horizontally off of a cliff with a velocity of 20 m/s. The
rock lands 60 m from the base of the cliff.
V=20 m/s
60 m
According to the information and diagram above, what is the height of
the cliff?
Answer:
44.1 m
Explanation:
Which event in a solar cell uses the photoelectric effect?
Answer:
Electromagnetic waves strike a semiconductor, removing some of
its electrons, which form a current.
Answer:Electromagnetic waves strike a semiconductor, removing some of its electrons, which form a current.
Explanation:
A transformer usefully transfers 190,000 W of the 200,000 W of energy supplied to it. How efficient is the transformer?