If the half-life of a radioactive sample is 22 years, it will take 73.11 years for the sample to decay to 10%.
How is half-life used to calculate radioactive decay?A fixed percentage of activity is lost during radioactive decay per unit of time. Half-life: The amount of time needed for a sample to degrade to 50% of its starting state. 1/2 = e –(λ*T1/2). constant over time and unique to each nuclide.
Do longer half-lives imply a lower radioactivity?The term (physical) half-life refers to the amount of time needed for radioactivity to decline and split in half. Half of the radioactivity will remain after a period of time equal to the half-life has passed, and a further half of the radioactivity will remain after a period of time twice as long as the half-life has passed.
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What does the 2+ in mg2+ represent?
2+ in [tex]Mg^{2+}[/tex] represents that for becoming stable magnesium needs to release 2 electrons.
As, the atomic number of Magnesium = 12
So, the electron distribution will be like 2, 8, 2
As here, we can see, 2 electrons are present in the outermost orbit of Magnesium, due to which magnesium is not stable.
In order to become stable, Magnesium needs to release its 2 electrons.
After releasing 2 of its electrons, there will be 8 electrons in the outermost orbit of magnesium, and due to the octet in the outermost orbit, magnesium becomes stable.
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a race car starts from rest on a circular track of radius 400 m. the car's speed increases at the constant rate of 0.547 m/s2. at the point where the magnitudes of the centripetal and tangential accelerations are equal, determine (a) the speed of the race car, (b) the elapsed time, and (c) the distance traveled
The speed of the race car is 14.142 ms−1.
The amount of time that passes between an event's beginning and its conclusion is known as the elapsed time. The time that has gone between the start and finish of an event is known as the elapsed time, to put it simply.
Calculation:Centripetal acceleration ac is given by the expression
ac=Rω
2=v2R
where
v is linear velocity of the object, ω is its angular velocity and R is the radius of the circle in which object moves.
Tangential acceleration at is given to be =0.500 ms−2
Equating the magnitudes of two and inserting value of R
we get v2400=0.500
⇒v=√0.500×400=√200=14.142 ms−1
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does anyone knows the answer for this question
Answer:
ofc it is D because the distance is far and the plane is the fastest.
Explanation:
Answer:
The answer is A
Explanation:
Most postal company hany ships with large amounts of mail because it is the cheapest way to send mail.
zeke is attempting to learn more about his world. when he encounters a new object, he picks it up and puts it in his mouth. zeke is most likely in which of jean piaget’s stages of cognitive development?
It sounds like Zeke is most likely in Jean Piaget's stage of cognitive development known as the sensorimotor stage.
This stage typically occurs during the first two years of life, and it is characterized by the development of sensory and motor skills. Children in the sensorimotor stage use their senses and physical actions to explore and understand the world around them, and they learn about objects and their properties through direct interaction with them.
During the sensorimotor stage, children often engage in behaviors such as reaching for objects, grasping and manipulating objects, and putting objects in their mouths as a way of exploring and learning about them. These behaviors help children develop their sense of object permanence, which is the understanding that objects continue to exist even when they are not visible.
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Two identical 1500k car moving perpendicular to each other. One moves with a speed of 25 m/s due north and the other moves at15 m/s due east. What is the total momentum of the system?
The total momentum of the system is 22500 kg-m/s i + 37500 kg-m/s j.
Momentum is given by the formula,
P = m * v
where, m is mass
v is velocity
Given that,
Mass of the first car m₁ = 1500 kg
Mass of the second car m₂ = 1500 kg
Velocity of the first car v₁ = 25 m/s
Velocity of the second car v₂ = 15 m/s
The momentum of the first car is p₁ = m₁ * v₁ = 1500 * 25 = 37500 kg-m/s j
The momentum of the second car is p₂ = m₂ * v₂ = 1500 * 15 = 22500 kg-m/s i
The total momentum of the system is sum of momentum of both the cars.
⇒ 22500 kg-m/s i + 37500 kg-m/s j
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anything that alters behavior is considered a
It is occasionally regarded as a mental illness, but it is also a method for treating such illnesses.
What does psychology mean by behavioural change?
1. a methodical strategy for using operant conditioning to modify behaviour.
2. Any change in behaviour that has an impact on a patient's functioning, whether it results from psychotherapeutic or other interventions or just happens naturally.
What causes a change in behaviour?
After going through a stressful scenario or seeing an unpleasant incident, a person's mood could change. These behavioural alterations could be the result of a mental health issue, such as: Anxiety:
Anxiety is a feeling of nervousness or uneasiness about a situation.
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an annulus with inner radius and outer radius lies in the plane. there is a constant electric field with magnitude , that makes an angle with the horizontal. what is the electric flux through the annulus?
To calculate the electric flux across a location, multiply the electric field by the surface area projected in a plane perpendicular to the field. On any closed surface, the universal law known as Gauss's Law is applied.
What is the sphere's electric flow like?In the case of a sphere-shaped Gaussian surface with radius r > R, the electric field is directed outward and has the same strength at every point along the surface. Simply multiplying the electric field by the spherical surface's area yields the electric flux.
What is the electrical flux formula?Electric flux (E) traveling through a surface of vector area S equals: E = ES = EScos if the electric field is uniform is the angle between the electric field lines and the normal (perpendicular to S), S is the area of the surface, and V/m is the magnitude of the electric field.
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help please !!! determine the voltage
The voltage of given circuit is 5 volts.
What is Ohm's law?Explanation of Ohm's Law, the relationship between current, voltage and resistance. The amount of continuous current flowing through many materials is directly proportional to the potential difference or voltage between them. Therefore, if the voltage V (in volts) across a wire made of one of these materials is tripled, the current I (in amperes) is also tripled. The quotient V/I remains constant. The quotient V/I for a particular piece of material is called the resistance R and is measured in units called ohms. The resistance of materials that obey Ohm's law does not change over vast voltage and current ranges. Ohm's law can be expressed mathematically as V/I = R.
Given,
I = 0.5 Amp
As all the four resistors are connected in series, total resistance of the circuit is:
R = 1 + 2 + 3 + 4
R = 10 Ω
Using Ohm's law:
V = IR
V = 0.5 × 10
V = 5 volts
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Which graphs represent functions?
The graph D represents a function.
"A function is a relationship between a number of inputs and outputs." Simply described, a function is an association between inputs in which each input has exactly one output. There is range, codomain, and domain for every function.
We use the vertical line test to determine whether or not the graph accurately depicts a function.
If any vertical line crosses the graph at exactly one point, the graph represents the function; otherwise, it does not.
Observing the graphs, we can say that, the vertical line intersects the graph D at one point only.
Hence, graph D represents a function.
The question is incomplete. It does not contain graphs. It is attached in the attachment below.
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While spending the day relaxing on the beach, Keisha notices that the Sun appears to move across the sky. What is the best explanation for why this is happening?
a. Earth's revolution
b. the Sun's tilt on its axis
c. the Sun's revolution
d. Earth's rotation on its axis
While spending the day relaxing on the beach, Keisha notices that the Sun appears to move across the sky. The best explanation for this is the Earth's rotation on its axis.
So basically, the earth keeps on rotating about its axis constantly. The change from day to night is due to the phenomenon of Earth's rotation on its axis only. The sun remains fixed, but the earth rotates. So for a person on earth, it seems like the sun rises and moves across the sky and then sets, but in reality, it is the earth that rotates on its axis.
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verify green's theorem for the disc d with center (0, 0) and radius r and the following functions.
The question is incomplete I answered in general way .
Green's theorem in vector calculus connects a line integral centered on a straightforward closed curve C to a double integral over the plane region D enclosed by C. It is Stokes' theorem's two-dimensional particular instance.
Green's theorem has numerous uses. One involves solving two-dimensional flow integrals, which states that the total amount of fluid emitted from a volume is equal to the sum of the outputs from all surrounding areas. Green's theorem can be applied to plane geometry, and in particular, area surveying, to find the area and centroid of plane figures by simply integrating over the perimeter.
One of calculus's four fundamental theorems, all of which are closely related to one another, is green's theorem.
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The greater efficiency achieved with the curved blades of a Pelton wheel is due to ____.
The greater efficiency achieved with the curved blades of a Pelton wheel is due to the fact that the curved blades are able to extract more kinetic energy from the moving water.
This is because the curved blades are able to direct the water onto a smaller area of the wheel, which results in a higher impact force and a greater transfer of energy from the water to the wheel.
In contrast, flat blades are not as effective at extracting kinetic energy from the water because they do not focus the water onto a smaller area of the wheel. As a result, the impact force is lower and less energy is transferred from the water to the wheel.
The Pelton wheel is a type of impulse turbine that is used to harness the energy of falling water in hydropower plants. It consists of a wheel with curved blades mounted on a shaft, which is turned by the impact of water jets that are directed onto the blades. The efficiency of the Pelton wheel can be improved by using a greater number of blades, which can increase the impact force and the transfer of energy from the water to the wheel.
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What is a force that resists the sliding motion of two surfaces that are touching multiple choice question?
We can think of friction force is a force that resists the sliding motion of two surfaces that are touching one another. Kinetic friction is another name for this friction.
Kinetic friction force: what is it?As it increases to a certain degree before beginning to decline when greater power is applied to the object, this is actually best considered as the biggest benefit: The kinematic friction force is easy to calculate on a flat surface, but it is more difficult on an inclined surface.Why is friction significant and what is it?Friction is simply the force that prevents something from slipping. Every object experiences kinetic friction, which prevents many objects from moving at once. The force acting in the opposite direction when an object wants to slide in that direction The brakes are applied precisely where necessary when an automobile wants to stop.To know more about Kinetic friction visit: brainly.com/question/29100737
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A box decelerates as it moves to the right along a horizontal surface as shown in the
diagram.
Which vector best represents the direction of the force of friction on the box?
The direction of the vector of motion on the right then the direction of the force of friction on the box will be toward the left. Therefore, option D is correct.
What is frictional force?Frictional force can be defined as the force generated by two surfaces coming in contact and sliding against each other. These forces are affected by the position of the object, surface texture, and angle.
Friction can be explained as the force that prevents the movement of the moving object when the surface of one object comes in contact with another.
The fractional force acting on an object can be represented as:
F = μmg
In the given diagram the box is moving in the right direction, Then the force of friction will act in the opposite direction. Therefore the vector in the left direction represents the direction of the force of friction on the box.
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describe the evolution of an elliptical galaxy. how does the evolution of a spiral galaxy differ from that of an elliptical?
The evolution of an elliptical galaxy involves a gradual decrease in star formation and a steady increase in its size.
Over time, gas and dust are depleted, leaving behind an aging stellar population and a low level of star formation. As star formation declines, the galaxy's mass slowly increases, forming a larger and more elliptical shape.
The evolution of a spiral galaxy is different in that the spiral structure is maintained over time. Gas and dust are continually replenished, providing the necessary materials needed for ongoing star formation. As a result, the stellar population remains young and active, and the galaxy maintains its distinct spiral shape.
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(figure 1) is a snapshot graph at t = 0 s of two waves on a string approaching each other at 1 m/s.
Six values of the displacement of the string exist at x = 5.0 m at 1 s from t = 0 s to t = 6 s.
All the numbers existing between two specific integers are called as an interval. Out of these whichever umbers fall between these actual values are termed as range.
Intervals contain real numbers falling between two set numbers.
A snapshot graph at t = 0 s of two waves on a string coming towards one other at time interval of 1 m/s is provided. Then, the values of the string displacement at x = 5.0 m at 1 s from t = 0 s to t = 6 s are,
At t = 0
s,= Y₀= 0 cm
At t =1
s,= Y₁= 0 cm
At t = 2
s,= Y₂= 0 cm
At t =3
s,= Y₃= 0 cm
At t =4
= Y₄= 0 cm
At t = 5 s,
= Y₅=0 cm
At t = 6
s,= Y₆= 0 cm
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The complete question:
(Figure 1) is a snapshot graph at t = 0 s of two waves on a string approaching each other at 1 m/s.
1. List the values of the displacement of the string at x = 5.0 m at 1 s intervals from t = 0 s to t = 6 s.
What force causes the resistance of sliding of one surface over another?
Friction is a force that prevents two solid objects from rolling or sliding over one another. It's possible that frictional forces, like the traction required to walk while slipping, are advantageous.
What kind of force is necessary to slide two sliding surfaces past one another?A body rolling over a rough surface causes friction. Its coefficient of friction, or or Cf, indicates how rough the surface is. By dividing the normal force by the coefficient of friction, the friction force is calculated. Motion is constantly opposed by the frictional force.
What is the term for when two objects slide over one another?When two items move against one another, like in the case of the books on the table, sliding friction occurs. Because the two things are in contact, sliding friction results.
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What best describes a scrum team TCS?
A Scrum Team can be described as an autonomous and a cross-functional team that works on developing product.
It is described as "a framework that enables people to manage complicated adaptive challenges while productively and innovatively producing goods of the greatest quality." Just enough preparation is done upfront by the entire team, then ongoing planning continues throughout the project. Scrum is a project management system that prioritizes collaboration, responsibility, and incremental advancement toward a clear objective. The framework starts with a straightforward directive: Begin with what is visible or understandable. The team begins to have a defined velocity for their work as they get to the performing stage. Small but with sufficient members to produce Product Increment Work together as a team to plan your own workload. Members of the team must be experts. Reports to the Product Owner from Cross Functional.
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How is Hector an epic hero in the Iliad?
Hector is an epic hero in the Iliad due to his nature and best warrior abilities.
Hector is considered the bravest and strongest warrior among all the members of Trojan army. He proved his warrior skills by defeating Archean army when Achilles was absent. He lead the war and came back after winning. The Archeans had to leave.
Hector not only set the Archeans fire to ship but also killed Petroclus. The iliad also suggests that Hector was good in every role, as a son, husband, father and as friend as well. in
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What does an inclined plane decrease?
An inclined plane creates a mechanical advantage that reduces the effort required to lift an object to a particular height, but it also lengthens the distance the object must travel.
The slope and height of an inclined plane determine its mechanical advantage. Divide the length of the slope by the height of the slope to determine the ideal mechanical advantage of an inclined plane. A mechanical advantage is created by an inclined plane to lessen the effort required to lift an object to a specific height, but it also lengthens the distance the object must travel. To move the distance and the height of an object going up an inclined plane, the object must move the complete length of the slope of the plane. For instance, if your ramp is 20 meters long and rises 5 meters high, your trade-off is between going 20 meters instead of lifting 5 meters straight up, and your ideal mechanical advantage is 4.
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how long will a bus take to travel 150 km at an average speed of 40km/h
Answer:
3.75 hours
Explanation:
Take 150 divided by 40 = 3.75 hours
Answer:
3.75 hours
Explanation:
The formula for finding time (how long) is t = s/v where s is distance, v is speed and t is time.
We know that the distance that a bus wants to travel is 150 km with an average speed of 40 km/h. Therefore, substitute s = 150 km and v = 40 km/h in the formula:
[tex]\displaystyle{t=\dfrac{150 \, \text {km}}{40 \, \text {km/h}}}\\\\\displaystyle{t=3.75 \, \text{hours}}[/tex]
Therefore, it’ll take about 3.75 hours for a bus to travel 150 km distance.
if a boat and its riders have a mass of 1200 kg and the boat drifts in at 1.7 m/s how much work does sam do to stop it?
The work done to stop the boat from the movement is 1020 J
The mass of the boat = 1200 kg
The initial velocity of the boat = 1.7 m/s
The final velocity of the boat = 0 m/s
The work done to stop the boat is the change in kinetic energy of the boat from movement to rest. It can be done by using the formula,
W = ΔKE = 1/2mu² - 1/2mv²
where m is the mass of the boat
u is the initial velocity of the boat
v is the final velocity of the boat.
Let us substitute the known values in the above equation, we get
W = 1/2 (1200)(1.7) - 1/2(1200)(0)
= 1/2 x 1200 x 1.7
= 600 x 1.7
= 1020 J
Therefore, the work done is 1020 J
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018 (part 1 of 2) 10.0 points A jet aircraft is traveling at 232 m/s in horizontal flight. The engine takes in air at a rate of 117 kg/s and burns fuel at a rate of 4.8 kg/s. The exhaust gases are ejected at 723 m/s relative to the aircraft. Find the thrust of the jet engine. Answer in units of N. 019 (part 2 of 2) 10.0 points Find the delivered power. Answer in units of W.
The thrust of the jet engine is 59804 N and the delivered power is 1.388 MW.
What is thrust?Thrust is defined as the amount of effort required to move an airplane through air that is resisting its passage called drag. Newton's Second and Third Laws could be used to quantitatively explain the reaction force of thrust.
Given
Speed = 232 m/s
Air intake =117 kg/s
Fuel burn rate = 4.8 kg/s
Speed of exhaust gas = 723 m/s
Rate of mass change = 117 kg/s + 4.8 kg/s
= 121.8 kg/s
Thrust T = 121.8 x 723 - 121.8 x 232
Thrust T = 88061.4 - 28257.6
Thrust T = 59804 N
Delivery power = 232 x 59804
Delivery power = 1.388 MW
Thus, the thrust of the jet engine is 59804 N and the delivered power is 1.388 MW.
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a cave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift 1s performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spe- lunker is accelerated to a speed of 5.00 m/s; (b) he is then lifted at the constant speed of 5.00 m/s; (c) finally he is decel- erated to zero speed. how much work is done on the 80.0 kg rescuee by the force lifting him during each stage
Answer:
Below
Explanation:
Work = force x distance ==> the forces during the 3 stages are different
a) I will assume accel is constant for the first 10 m
Average velocity = 5/2 = 2.5 m/s
10 m / 2.5 m/s = 4 seconds
then a = 5 m/s / 4 s = 1.25 m/s^2 <==this accel is added to 'g'
F = ma
= 80 * (9.81 + 1.25) = 884.8 N
W = 884.8 * 10 = 8848 J
b) This one is easier W = F * d = (80)(9.81)(10) = 7848 J
c) Now we decelerate at 1.25 m/s^2 <==== this SUBTRACTS from g
W = ( 80 )(9.81-1.25)*10 = 6848 J
Answer:
C
Explanation:
Positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed. C
What is the strength of magnetic field known as MCQ?
The term "magnetic flux density" refers to the strength of the magnetic field. The Greek letter Phi or the Phi suffix B are frequently used to represent magnetic flux.
What is magnetic flux density? The quantity of magnetic field lines that travel through a specific closed surface is known as the magnetic flux. It offers a way to measure the total magnetic field that traverses a specific surface area. In this case, the area under examination can be of any size and oriented in any way relative to the magnetic field's direction.A flux meter is typically used to measure magnetic flux. The magnetic flux unit in SI and CGS is listed below:Weber is the magnetic flux SI unit (Wb).Volt-seconds are the base unit of measurement.Maxwell is the CGS component.For more information on magnetic flux density kindly visit to
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Organizational commitment has been found to be positively correlated with all of the following exceptan employee's agean employee's time on the job.an employee's level of educationthe current job market.2 pointsQUESTION 2Shannon is given random bonuses of varying amounts throughout the year based on "how well the company is doing." She is being reinforced using afixed ratio schedule.variable ratio schedule.fixed interval schedule.variable interval schedule.2 pointsQUESTION 3Glass created a computer game experiment whose results indicated that Type A subjects?Showed a significantly higher physiological stress response rates than the Type B subjects, but recovered back to baseline rates as quickly as the Type Bs.Showed significantly lower physiological stress response rates than the Type B subjects.Showed similar physiological stress response rates to the Type B subjects in the game, but had a signficantly higher stress response to the "harrass" condition.Showed significantly higher stress response rates but beat the game more times than the Type B subjects.2 pointsQUESTION 4According to goal-setting theory, the key determinants of motivation in the workplace arejob satisfaction and the accomplishment of goals.monetary incentives associated with meeting goals.specific, challenging opportunities and commitment to goals.specific, challenging opportunities and organizational policies directed at goal attainment.2 pointsQUESTION 5There is a negative correlation between age and voluntary absenteeism.TrueFalse
Current Job Market, Variable Ratio Schedule, Type A subjects recover to baselines rates much slower than Type B subjects., Specific challenging activities and commitment to goals,True
1) Current Job Market
Numerous studies have demonstrated a favourable correlation between organisational dedication and an employee's age, tenure, and educational attainment.
2) Variable Ratio Schedule
A reinforcement that strengthens behaviour after an erratic number of responses is known as a variable-ratio schedule.
3). Individuals with Type A personality commonly exhibit traits such as competitiveness and assertiveness, high levels of aggression and impatience, always associate themselves with winning than losing (i.e. achievement-oriented), and functioning at a quick pace. Most of them are highly dedicated to work and therefore force themselves into things that may not necessarily be interesting for them.
In the computer game experiment, Type A subjects are likely to show significantly higher stress response rates but beat the game more often than Type B subjects. Although both type A and B subjects are exposed to the same stress levels, Type A subjects experience more physiological stress and are likely to function better at those stress levels. Moreover, Type A subjects recover to baselines rates much slower than Type B subjects.
4) Specific challenging activities and commitment to goals
According to Locke's theory of goal setting, situations that are challenging and conscious objectives drive human behaviour.
5) True
According to numerous research done to ascertain the connection between age and absenteeism.
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how can observations of nonscienists, like fisherman be of value to scientists
The way that observations of nonscientists, like fisherman be of value to scientists is that:
By taking part in data-less stock assessment procedures, which attempt to estimate the spawning potential of a specific fishing population by only determining the size at maturity for a certain species, fishermen can contribute to the science of fisheries.What is observation and why is it important to scientists?In science, observation is vital. Scientists gather and record data through observation, which allows them to create and subsequently test ideas and hypotheses. Scientists can observe in many different ways, using their own senses or instruments to increase their vision or hearing.
Science actually takes cultural values into account. In turn, values can be objective if they are founded on widely acknowledged concepts. In contrast, scientists prioritize verifiability, testability, accuracy, precision, generality, and simplicity.
Therefore, In terms of receiving financing and being able to communicate their work to their peers in a way that is clear and understandable, being able to discuss their findings with both scientists and nonscientists is essential for their own professional advancement.
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Calculate the time to fatigue and record in Lab Data Time: Force(kg): Number of Active motor Units: 0s 48 4 15s 43 3 30s 38 3 45s 30 2 60s 24 2 70s 19 1
The time to fatigue calculated from the given record in Lab data is preferably 60 seconds.
Time to fatigue is the time that is taken for muscle contraction to decrease by 50% of its maximum strength.
Force is the one that is measured by weight here. Here, as time progresses force is seen to come down.
When force is seen to come down, there is a decrease in the number of motor units that get employed as well.
Time to fatigue is the one where this force expressed as weight reaches half of the maximum.
Here, the maximum force expressed as kg is 48kg at 0 sec.
Half of 48kg is 24kg. This is the point where time to fatigue happens with a decreased number of motor units.
Here, we can see that at the 60th second , 50% decay which is 24 kg force happens with the help of only 2 motor units.
Hence, our time to fatigue here is preferably 60 seconds.
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Is the value of lambda constant?
Lambda is the symbol for wavelength it isn't a constant there for no standard value
it is linked to frequency:
frequency x Wavelength = speed of light (3x10^8)
What is lambda?
Lambda λ is a letter from the Greek alphabet.In physics, lambda λ is mainly used as a variable to denote or denote the wavelength of any wave.In nuclear physics and radioactivity, lambda is used to denote the decay constant of radioactivity.When it comes to electric fields, lambda is also used to denote the linear charge density of a uniform line of electric charge.To know more about lambda, click the link given below:
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What is the relationship between frequency and wavelength direct or inverse What is the relationship between frequency and energy direct or inverse?
Wavelength & frequency were related to energy in the same way that they are to light.Greater energy is correlated with shorter wavelengths and higher frequencies.E = hv is the energy equation.
Is there an inverse or direct link between frequency and energy?For an electromagnetic wave, the connection between frequency & energy is as follows.The electromagnetic wave's energy (E) is equal to its frequency times Plank's constant (h) (f).
What connection exists between energy, frequency, and wavelength?A wavelength's frequency & energy (E) drop as it gets longer.You may conclude from these equations that wavelength gets shorter as the frequency rises.The wavelength lengthens as the frequency drops.
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