A lens is:
a translucent object that refracts light rays and causes the formation of images.
a transparent object that refracts light rays and causes the formation of images.
a transparent object that reflects light rays and causes the formation of images.
a translucent object that reflects light rays and causes the formation of images.
Answers
Answer:
the second answer is correct
Explanation:
A lens doesn't reflect light rays, it refracts them
And it is a transparent object
Related Questions
How does the magnitude of the force depend on the magnitude (absolute value) of charge 1 and charge 2.
Answers
Answer:
Product
Explanation:
The force between two charges is given by :
\(F=\dfrac{kq_1q_2}{r^2}\) ...(1)
Where
k is electrostatic constant
q₁ and q₂ are charges
r is the distance between charges
From equation (1), it is clear that the magnitude of the force is directly proportional to the product of charges.
What type of circuit is shown
Answers
Answer:
electric circuit............
which grade
alice and bob stand on the roof of a building, each with a soccer ball. alice kicks her ball perfectly horizontally, giving it some velocity in the x-direction. bob instead drops his ball straight down from the edge of the roof. if they do so at exactly the same time, which ball hits the ground first?
Answers
First to strike the ground is Alice's ball. component of acceleration and velocity that is horizontal
What is an easy way to define velocity?A particle or object's movement with function of time is expressed vectorially as velocity. The meter per second (m/s), usually referred to as speed, is the accepted unit of velocity magnitude.
How do velocity and acceleration differ?Acceleration is the speed at which displacement changes. The pace at which speed changes is known as acceleration. Because it comprises of both magnitude and direction, velocity is a vector quantity. Since acceleration is merely the rate at which velocity changes, it too is a vector quantity.
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Question 5 1 pts What is the voltage change if you cross a resistor R opposite the direction of the current I? (This means you want Vf-V;where Vi is the voltage where the current leaves the resistor and Vf is the voltage where the current enters the resistor.) What is the voltage change if you cross a resistor R in the same direction as the current I? (in this case Vi is the voltage where the current enters the resistor and Vf is the voltage where the current leaves the resistor.) a. -IR in both cases b. -IR in the first case and c. +IR in the second case. d. +IR in both cases e. +IR in the first case and -IR in the second case.
Answers
The voltage increase is Vf-VI (Positive because the voltage increases as we move across the resistor). Therefore, the correct option is (e) +IR in the first case and -IR in the second case.
As per the given problem, the voltage change if you cross a resistor R opposite the direction of the current I is Vf-Vi (where Vi is the voltage where the current leaves the resistor and Vf is the voltage where the current enters the resistor.)Let us suppose that the current I moves from left to right through the resistor.
The electrons are moving in the opposite direction. So they are moving from right to left. The conventional current (I) goes from left to right. The voltage drop across the resistor is thus VI-VF. (Negative because the voltage decreases as we move across the resistor).
The voltage change if you cross a resistor R in the same direction as the current I is Vf-Vi (in this case Vi is the voltage where the current enters the resistor and Vf is the voltage where the current leaves the resistor.)Here, the current flows from left to right through the resistor. This time, electrons are also flowing from left to right.
The voltage increases as we move across the resistor from left to right (with the current). Therefore, the voltage increase is Vf-VI (Positive because the voltage increases as we move across the resistor).
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Engine Misfire Diagnosis Based on the Torsional Vibration of the Flexible Coupling in a Diesel Generator Set: Simulation and Experiment
Answers
In a diesel generator set, flexible couplings are frequently utilized to accommodate various imperfections including misalignments and torque variations. On the other hand, severe vibration brought on by frequent engine misfires can result in premature failures of the couplings as well as the entire generator set.
Additionally, the connection has an impact on early misfires brought on by problems with fuel injection and cylinder seals as well as detection performance. This study examines both theoretically and experimentally the torsional vibration and dynamic torque of the flexible coupling that connects a 6-cylinder diesel engine to a dynamometer.
Methods This system is a typical diesel generator set that has been transformed using the Lagrange equation method into a 10-DOF torsional dynamic system. The model is used to predict the effects of various misfire conditions on the dynamic torque on the coupling after the model has been verified by measuring vibration responses at the free end and the coupling with a magnetic speed sensor and a wireless torque sensor. This aids in the development of reliable diagnostic features for misfire detection and diagnosis.
Results and Interpretations Results indicate that the torsional vibration and load of the flexible coupling are significantly influenced by diesel engine misfires (more than five times more) than the dynamic torque is. Although both the torque of the flexible coupling and the torsional vibration can be used to detect the occurrence of diesel engine misfires, the vibration somewhat outperforms the torque in terms of pinpointing the misfired cylinders.
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a pump with a displacement of 65 cc/rev has a mechanical efficiency of 0.93. what is the actual torque (in n-m) when the outlet pressure is 18.1 mpa?
Answers
A pump with a displacement of 65 cc/rev has a mechanical efficiency of 0.93. When the outlet pressure is 18.1 MPa, the actual torque is 11709.5 N-m.
Torque is a force on a rotating axis that can cause an object to move in a circle or rotate. Torque is also known as the moment of force. Any force whose direction does not stop at the axis of rotation of the object or the object's point of mass can be said to give torque to the object.
To calculate the actual torque (in N-m) when the outlet pressure is 18.1 MPa for a pump with a displacement of 65 cc/rev and a mechanical efficiency of 0.93, you can use the formula
Torque = Pressure x Displacement / Efficiency.
Using this formula, the actual torque would be equal to
Torque = 18.1 MPa x 65 cc/rev / 0.93
Torque = 1709.5 N-m.
So, torque is 1709.5 N-m
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Think more about the situation in the question above. If you picked a "good" thing, how might
boundaries have helped you choose the "right" think instead? If you picked the "right" thing, how
did your boundaries help you?
PLEASE HELP RIGHT NOW !
Answers
your on here to lol we must be hella failing g
challenge
3. A car accelerates at a constant rate from 15 m's to 25 m/s while it
travels a distance of 125 m. How long does it take to achieve the final speed?
Answers
Answer:
6.25 second
Explanation:
we know that
s= (u+v)/2*T
125=20t
t=6.25 second
plz mark as brainalist
Mass of block A above is 25-kg. Calculate the force of gravity on block A.
Answers
Answer:w+mg
Explanation:
free fall is possible on lunar but not on earth surface.Why?
Answers
Answer:
The earth has more gravity so that means if you jump out of a plane without a parachute u will die. But the moon has less gravity so u will not die when hit ground. But someone can probally explain it better than me.
More gravity equals more speed in some cases like falling
More people die cach year in the U.S. as a result of
Answers
I would say the Common Cold because it's the main reason why kids and adults miss school or work.
I hope this helps <3 :)
(also please mark brainliest if you want to)
Answer:
For more than a decade, heart disease and cancer have claimed the first and second spots respectively as the leading causes of deaths in America. Together, the two causes are responsible for 46% of deaths in the United States. There is donation center's to help fight back against cancer and heart diseases, There are also of course places you can go to become a organ donner if there is no saving you from something... Hope this helps^_^
Explanation:
plz give brainliest and rating
A pair of sunglasses fall from a hot air balloon, 225 m above the ground. If air resistance is negligible, calculate
a) the time it takes for the sunglasses to reach the ground
b) the sunglasses' final velocity, right before they hit the ground
Answers
(a) The glasses are a height y above the ground at time t according to
y = 225 m - 1/2 g t²
where g = 9.80 m/s² is the magnitude of the acceleration due to gravity. They reach the ground when y = 0 :
0 = 225 m - 1/2 g t²
t² = (450 m) / g
t ≈ 6.78 s
(b) The glasses have a velocity v of
v = - g t
so that at the time they hit the ground, they do so with a velocity of
v = - g (6.78 s)
v ≈ 66.4 m/s
Which statement accurately describes this atomic spectrum? There is a horizontal rectangle with the colors of the rainbow from violet to red. There are lines in purple, blue, green and orange. The black lines represent the energy emitted by the electrons. The black lines represent the energy absorbed by the electrons. The colored lines represent the energy emitted by the electrons. The colored lines represent the energy absorbed by the electrons.
Answers
Answer:
The black lines represent the energy absorbed by the electrons.
Explanation:
Atoms emit lights when they are excited. These lights are of particular wavelengths that match with different colors. A series of colored lines appear along with spaces in the middle of the two colors. The middle of the colors is filled with dark spaces. Each spectral line of an element represents a specific characteristic of the element. These colored lines appearing in the form of series are termed to be the atomic spectrum of the element. Identification of the elements is done through the line of the spectrum they possess.
Answer:
(B) The black lines represent the energy absorbed by the electrons.
Explanation:
Which step of mitosis involves the chromosomes lining up in the center of the cell?
Answers
Answer:
Metaphase
Explanation:
During metaphase,chromosome line up in the middle of the cell.
In the hierarchy of motor control, which of the following is a function at the lowest level of control? Choose the correct option.
Activation of motor neurons that generate goal-directed movement
Sequences of muscle contraction to accurately achieve the goal
The goal of movement and the best method to achieve this goal
Memory of sensory information from the past movements
Activation of motor neurons that generate goal-directed movement
Answers
Activation of motor neurons that generate goal-directed movement.
At the lowest level of control in the hierarchy of motor control, the activation of motor neurons that generate goal-directed movement is the function that takes place. This step involves the direct activation of the motor neurons in order to initiate and execute the desired movement. Motor control involves a hierarchical organization of processes that contribute to the generation and execution of movement. At the lowest level, the activation of motor neurons occurs, which directly controls the muscle contractions required for goal-directed movement. Motor neurons are specialized nerve cells that transmit signals from the central nervous system to the muscles, enabling them to contract and produce movement.When a movement is desired, the brain sends signals to the motor neurons responsible for the relevant muscle groups. These motor neurons then activate the muscle fibers, causing them to contract and generate force. By controlling the activation of specific motor neurons, the brain can precisely coordinate the timing, strength, and duration of muscle contractions necessary to achieve the intended goal.It is important to note that while the activation of motor neurons is the lowest level of control, it is not an isolated process. It is influenced by higher-level functions such as sensory feedback, coordination between muscle groups, and the integration of motor programs. However, at the lowest level, the activation of motor neurons is the fundamental step that directly translates the brain's intentions into actual movement.Learn more about motor control
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which kind of waves are used to make and receive cellphone calls?
Answers
Answer:
Micro Waves
Explanation:
Microwaves in particular are used by cell phone calls for wireless communication. A portion of radio waves with higher frequency makes up these microwaves. The cellphone's antenna transforms speech data into microwaves during a call, and these microwaves travel through the atmosphere to the closest cell tower. The tower takes in and sends the microwaves to the mobile device of the intended receiver. The gadget receives the microwaves and transforms them back into electrical signals so the recipient can hear the voice data. By employing the strength of microwaves, this technology provides wireless communication and permits mobile users to communicate from anywhere inside the cellular network's service area.
The type of waves that are used to make and receive cellphone calls are radio waves.
Radio waves are a type of electromagnetic radiation that has a long wavelength and low frequency. These waves are used for communication purposes because they are able to travel long distances without losing their signal strength. When a person makes a call on their cellphone, their voice is converted into an electrical signal that is sent through the cellphone's antenna as a radio wave. This radio wave is then picked up by the nearest cell tower, which receives the signal and sends it through the network to the person on the other end of the call. The process is reversed when the other person responds, with their voice being converted into a radio wave that is sent back through the network to the caller's phone.
In summary, radio waves are the type of waves that are used to make and receive cellphone calls due to their ability to travel long distances without losing signal strength.
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calculate the height (in m) of a cliff if it takes 2.32 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.19 m/s. 7.37 correct: your answer is correct. seenkey 7.37 m (b) how long (in s) would it take to reach the ground if it is thrown straight down with the same speed? 0.649 correct: your answer is correct. seenkey 0.649 s
Answers
To calculate the height of the cliff and the time it takes for the rock to reach the ground when thrown straight down, we can use the equations of motion.
(a) Height of the cliff:
When the rock is thrown straight up, it reaches its highest point before falling back down. The time it takes for the rock to reach its highest point is equal to the time it takes for the rock to fall back down to the ground.
Using the equation:
s = ut + (1/2)at^2
Where:
s is the distance traveled (height of the cliff),
u is the initial velocity (8.19 m/s),
t is the time (2.32 s),
a is the acceleration due to gravity (-9.8 m/s^2, taking downward direction as negative).
Rearranging the equation:
s = ut + (1/2)at^2
s = (8.19)(2.32) + (1/2)(-9.8)(2.32)^2
s = 19.004 - 25.798
s = -6.794 m
Since the height of a cliff cannot be negative, we take the absolute value of the result:
Height of the cliff = |s| = 6.794 m
So, the height of the cliff is approximately 6.794 meters.
(b) Time to reach the ground when thrown straight down:
When the rock is thrown straight down with the same speed, the initial velocity (u) is still 8.19 m/s, but the acceleration due to gravity (a) remains -9.8 m/s^2.
Using the equation:
s = ut + (1/2)at^2
Where:
s is the distance traveled (height of the cliff, which is now negative),
u is the initial velocity (8.19 m/s),
t is the time we want to find,
a is the acceleration due to gravity (-9.8 m/s^2, taking downward direction as negative).
Substituting the known values:
-6.794 = (8.19)t + (1/2)(-9.8)t^2
Rearranging the equation:
-6.794 = 8.19t - 4.9t^2
Rearranging further:
4.9t^2 - 8.19t - 6.794 = 0
Solving this quadratic equation, we find two possible values for t: 0.828 seconds and 1.303 seconds. Since we are considering the time it takes to reach the ground, the valid solution is t = 0.828 seconds.
Therefore, when the rock is thrown straight down, it takes approximately 0.828 seconds to reach the ground.
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A sample of ideal gas is in a cylinder with a movable piston. 600J of heat is added to the gas in an isothermal process. As the gas expands, pushing against the piston, how much work does it do
Answers
The work done by the ideal gas as it expands is 600J.
In an isothermal process, the temperature of the ideal gas remains constant. In other words, ΔT = 0. Therefore, ΔU = 0 (where ΔU is the change in internal energy of the ideal gas).It's also important to mention that work is done by a gas only if it expands or contracts. When a gas expands, it pushes the piston, doing positive work. When a gas contracts, the piston pushes back, doing negative work.
In order to find the work done by the ideal gas as it expands, we need to use the first law of thermodynamics, which states that the change in internal energy (ΔU) of an ideal gas is equal to the heat added (Q) minus the work done (W) by the gas:
ΔU = Q - W Since we know that
ΔU = 0 (as the process is isothermal) and
Q = 600J, we can solve for W:
W = Q - ΔUW
= 600J - 0W
= 600J
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Type the most appropriate SI base unit (with a specific prefix as needed) for expressing each of the following.?(a) the mass of a sports car (b) the distance from your home to your school (c) the mass of an elephant (d) the diameter of a large pizza (e) a semester at your school (f) the time it takes for light to travel from the sun to the earth (g) the time it takes to fly from New York to California (h) your mass (i) the length of the Prime Meridian (j) your height
Answers
Answer:
Explanation:
Standard International (SI) units of measurement is the acceptable global units of measure for physical quantities. they are majorly fundamental units.
Thus,
(a) The mass of a sport car is measured in kilograms (kg).
(b) The distance from your home to your school is measured in meters (m).
(c) The mass of an elephant is measured in kilograms (kg).
(d) The diameter of a large pizza is measure in meters (m).
(e) A semester at your school is measured in weeks.
(f) The time for light to travel from the sun to the earth is expressed in seconds (s).
(g) The time it takes to fly from New York to California is in seconds (s).
(h) Your mass is measured in kilograms (kg).
(i) The length of the Prime Meridian is expressed in meters (m).
(j) Your height is expressed in meters (m).
(PLEASE HELP!!) Identify two types of motion where an object's speed remains the same while it continues to change direction.
Answers
a narrow beam of ultrasound waves reflects off a liver tumor as illustrated. the speed of sound in the liver is 1 0 % 10% less than in the surrounding medium. what is the depth of the tumor?
Answers
Depth of liver tumor can be found using the formula: depth = (time x speed of sound in medium) / 2, where speed in liver is 10% less.
Ultrasound waves are used to detect tumors in the body, as they reflect off the tumor and produce an image. The depth of the tumor can be calculated using the formula: depth = (time x speed of sound in medium) / 2. In this case, the speed of sound in the liver is 10% less than in the surrounding medium.
This means that the speed of sound in the liver is 90% of the speed in the surrounding medium. Therefore, the depth of the tumor can be found by multiplying the time it takes for the ultrasound wave to reflect off the tumor by 90% of the speed of sound in the medium, and then dividing that result by 2. This calculation will give the depth of the tumor in the liver.
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a 3 kg mass is attached to a spring with spring constant 2 nt/m. what is the frequency of the simple harmonic motion? radians/second what is the period? seconds suppose the mass is displaced 0.2 meters from its equilibrium position and released from rest. what is the amplitude of the motion? meters suppose the mass is released from the equilibrium position with an initial velocity of 0.6 meters/sec. what is the amplitude of the motion? meters suppose the mass is is displaced 0.2 meters from the equilibrium position and released with an initial velocity of 0.6 meters/sec. what is the amplitude of the motion? meters what is the maximum velocity? m/s
Answers
The frequency of the simple harmonic motion can be calculated by the formula f = (1/2π)√(k/m), where k is the spring constant and m is the mass. Therefore, the frequency of the simple harmonic motion for a 3 kg mass attached to a spring with a spring constant of 2 N/m is f = (1/2π)√(2 N/m/3 kg) = 0.45 radians/sec.
The period of the motion can be calculated by the formula T = (1/f) = (1/0.45) = 2.22 seconds.
If the mass is displaced 0.2 meters from its equilibrium position and released from rest, the amplitude of the motion can be calculated by the formula A = x, where x is the displacement from the equilibrium position. Therefore, the amplitude of the motion is A = 0.2 m.
If the mass is released from the equilibrium position with an initial velocity of 0.6 meters/sec, the amplitude of the motion can be calculated by the formula A = v/2πf, where v is the initial velocity and f is the frequency. Therefore, the amplitude of the motion is A = 0.6 m/s/(2π*0.45) = 0.34 m.
The maximum velocity of the motion can be calculated by the formula v max = 2πfA, where f is the frequency and A is the amplitude. Therefore, the maximum velocity of the motion is v max = 2π*0.45*0.34 = 0.71 m/s.
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The frequency of the simple harmonic motion is 1.27 rad/s. The period of the motion is 0.79s.
When the mass is displaced 0.2 m from its equilibrium position and released from rest, the amplitude of the motion is 0.2m. When the mass is released from the equilibrium position with an initial velocity of 0.6 m/s, the amplitude of the motion is 0.37m. The maximum velocity of the mass is 1.14 m/s.
The formula for the frequency of the simple harmonic motion is given by:f = 1/2π√k/mWhere k is the spring constant and m is the mass of the object. Here, m = 3 kg and k = 2 N/mTherefore, the frequency of the simple harmonic motion is:f = 1/2π√k/m = 1/2π√2/3 = 0.72 rad/s
The formula for the period of the simple harmonic motion is given by:T = 2π√m/kHere, m = 3 kg and k = 2 N/mTherefore, the period of the simple harmonic motion is:T = 2π√m/k = 2π√3/2 = 3.84 s
The amplitude of the motion is given by :x = A sin (ωt)Where x is the displacement, A is the amplitude, ω is the angular frequency, and t is the time. If the mass is displaced 0.2 m from its equilibrium position and released from rest, then the amplitude of the motion is A = 0.2 m. If the mass is released from the equilibrium position with an initial velocity of 0.6 m/s, then the amplitude of the motion is given by :A = v0/ωHere, v0 is the initial velocity and ω is the angular frequency.
The angular frequency is given by:ω = 2πf = 2π(0.72) = 4.52 rad/s. Therefore, the amplitude of the motion is :A = v0/ω = 0.6/4.52 = 0.133 mIf the mass is displaced 0.2 m from the equilibrium position and released with an initial velocity of 0.6 m/s, then the amplitude of the motion is given by: A = √(x² + (v0/ω)²)Here, x is the displacement and v0 is the initial velocity. The angular frequency is given by:ω = 2πf = 2π(0.72) = 4.52 rad/s. Therefore, the amplitude of the motion is :A = √(x² + (v0/ω)²) = √(0.2² + (0.6/4.52)²) = 0.220 m
The maximum velocity is given by: vmax = ωAHere, ω is the angular frequency and A is the amplitude. Therefore, the maximum velocity is :vmax = ωA = 4.52 × 0.220 = 0.994 m/s
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PLS ANSWER ASAP
A cone with a mass of 6 g has a radius measuring 5 cm and a height of 2 cm. What is its density?
A. 60 g/cm3
B. 52.33 g/cm3
C. 0.6 g/cm3
D. 0.11 g/cm3
Answers
Answer: Answer is D
I took the test little while back.
the maximum speed of a 3.00-kg object in simple harmonic motion is 4.00 m/s. the maximum acceleration of the object is 5.00 m/s2. what is the period of simple harmonic motion?
Answers
The period of a 3.00kg object moving in a simple harmonic motion is 5.02s
Simple harmonic motion is a system where the object oscillates around the equilibrium position.
Based on the theorem, there are some formulas:
x(t) = A.cos t (ωt+∅)
x max = A
v max = Aω
a max = Aω²
ω = 2π/T = 2πf
From the question, we got some informations:
m = 3.00kg
v max = 4.00 m/s
a max = 5.00 m/s²
T = ?
We will use the formula for a max and v max to find the value of ω:
v max = Aω
v max = 4.00 m/s
Aω = 4.00 m/s ...(i)
a max = Aω²
5.00 = v max (ω)
5.00 = 4.00ω
ω = 1.25 rad/s ..(ii)
Next, we will use the Period formula:
ω = 2π/T
1.25 = 2π/T
T = 1.6π s
T = 5.02s
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When a +0.00235 C charge
moves from point A to point B, its
electric potential energy increases
by 0.418 J. What is the potential
difference between A and B?
Include the correct sign, + or -.
(Unit = V)
Answers
Answer:
177.87
Explanation:
acellus
The potential difference between the points A and B is 177.9 V.
What is meant by potential difference ?Potential difference between any two points is the amount of work required to move a unit positive charge along any path from point A to point B without accelerating is referred to as the electric field.
Here,
The charge on the particle, q = +0.00235 C
The change in electric potential energy, ΔU = 0.418 J
The potential difference can be defined as the electric potential energy per unit charge.
Therefore, the potential difference between A and B,
V = ΔU/q
V = 0.418/0.00235
V = 177.9 Volt
Hence,
The potential difference between the points A and B is 177.9 V.
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In any thermodynamic system that deals with the transfer of thermal energy, which of thefollowing is the most ideal state for that system?
Answers
Thermodynamics can be said to be a branch of Physics which involves the transfer of heat and other energy forms.
Thermal energy is the energy possesed by a system due to its temperature.
In thermodynamics, during the transfer of thermal energy, energy is wasted due to entryopy. And entropy is the measure of disorder of a system.
Therefore, in amy thermodynamic system that deals with the transfer of thermal energy, the most ideal state for that system is Entropy
ANSWER:
A. Entropy
what is the least restrictive isolation level that will prevent dirty reads?
Answers
READ COMMITTED is the least restrictive isolation level that can prevent dirty reads.
The least restrictive isolation level that will prevent dirty reads is the READ COMMITTED isolation level. This level allows only committed data to be read by transactions. If a transaction is updating a row, it locks that row to ensure that other transactions can't read or modify the data until the transaction is completed and the lock is released. This means that dirty reads cannot occur since uncommitted data is not accessible.READ COMMITTED level allows for better concurrency and performance since it doesn't block other transactions from accessing other rows that are not being modified.
In conclusion, READ COMMITTED is the least restrictive isolation level that can prevent dirty reads.
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Melanie ran the 100 meters race in 12 seconds what was her avarage speed?
Answers
Answer:
melanie ran 8.3 meters per second
Explanation:
I think thats right, hope it helps.
Can someone please help me it's urgent!
Answers
Answer:
6.8 x 10^6
Explanation:
Look up M A T H W A Y it will help you with all of your algebra needs
what is the leading hypothesis for venus’s lack of water?
Answers
Answer:
Its water molecules were broken apart, and hydrogen was lost to space. What kind of gas is most affected by thermal escape? What causes the release of oxygen into Earth's atmosphere?
Explanation: