7
Radon-222 is radioactive. It can be represented as 222 Rn.
86
For a neutral atom of radon-222, state
1. the number of protons,
2. the number of neutrons,
3. the number of electrons.

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.

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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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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The voltage of given circuit is 5 volts.

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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The way that  observations of nonscientists, like fisherman be of value to scientists is that:

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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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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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.

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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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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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.

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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.

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).

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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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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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.

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?

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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.

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.

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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The thrust of the jet engine is 59804 N and the delivered power is 1.388 MW.

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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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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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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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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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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The capacitance of the capacitor is 47.22×10^-12F

Capacitance is the ratio of the charge Q and the potential difference between the two plates. Also the capacitance can be expressed as:

C = εA/d, In this equation, C is capacitance; ε is permittivity, a term for how well dielectric material stores an electric field; A is the parallel plate area; and d is the distance between the two conductive plates. It is measured in Farad

A = 0.56×0.20 = 0.112cm²

d = 21mm = 0.021m

ε = 8.854×10^-12F/m

C = εA/d

C =( 8.854× 10^-12× 0.112)/0.021

C = 47.22 × 10^-12 F

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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.

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.

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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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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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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The position of the image of a cologne bottle is equal to 52cm. The magnification of the image is equal to 0.55 and the virtual image.

The reflecting part of the concave mirror is that which caves inwards and the reflecting part of a convex mirror is one which caves outwards.

[tex]\displaystyle \frac{1}{f}=\frac{1}{u}+\frac{1}{v}[/tex]

Where f is the focal length, u is the object distance and v is the image distance

Given, the focal length of the concave mirror, f = 33.0cm

The distance of the bottle, u = 93 cm

[tex]\displaystyle \frac{1}{33}=\frac{1}{93}+\frac{1}{v}[/tex]

1/v = 0.030- 0.0107

1/v = 0.0192

v = 52 cm

The magnification of the image, m = v/u = 52/93 = 0.55.

The image will be virtual.

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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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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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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

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.

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.

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.

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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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