A student walks 3 m north and 4 m south. The magnitude of the resultant displacement for the student is *

The time required to measure the counting rate due to the source alone to within a fractional standard deviation of 3% is ~1,080,000 min (~18,000 hrs)

Fractional is a term used to describe a part of a whole. It is usually used in mathematics to refer to a number that is not an integer. Fractions are written as a numerator (the top number) and a denominator (the bottom number). For example, the fraction 1/2 is read as "one-half."

The time required to measure the counting rate due to the source alone to within a fractional standard deviation of 3% can be estimated using the following equation:
Time = (3σ/counting rate)²
Where σ is the standard deviation of the background count and the counting rate is equal to the total counting rate minus the background count.
In this case, the standard deviation of the background count is equal to the square root of the background count, which is 29.
The counting rate is equal to the total counting rate of 80 counts/min minus the background count of 845, which is -765 counts/min.
Therefore, the time required to measure the counting rate due to the source alone to within a fractional standard deviation of 3% is:
Time = (3*29/(-765))² = ~1,080,000 min (~18,000 hrs).

To learn more about fractional
https://brainly.com/question/29441294
#SPJ4

The magnitude of the net force that the atmosphere applies to the roof when the outside pressure drops suddenly is  1.9 x 10⁵ N.

The pressure is the amount of force applied per unit area.

Pressure p = Force/Area

Given is a house has a roof (colored gray) with the dimensions shown in the drawing. The outside pressure drops suddenly by 13.2 mm of mercury, before the pressure in the attic can adjust.

The pressure difference ΔP = 13.2 mm of Hg

The length of the roof l = 14.5m

the breadth of the roof h = 4.21m

The force exerted by pressure is

Force, F = P x A

         = (13.2 mm of Hg) [(133 N/m²) /1 mm of Hg ](14.5 x 4.21)

         = 107,170.6 N

Then the net vertical force

    Fnet = 2F cos30

    Fnet = 2 ( 107,170.6) cos30

    Fnet = 185625 N

    Fnet =1.9 x 10⁵ N

The direction of the force is downwards, since the horizontal components of the forces cancel each other.

Hence,  magnitude of the net force is 1.9 x 10⁵ N

Learn more about pressure.

https://brainly.com/question/12971272

#SPJ1

The wavelength of the light is 550 nm.

For a double slit interference pattern with slit spacing, d we have

dsinθ = mλ where

d = slit spacing = 0.22 mm =

0.22 × 10^-3 m,

m = number of maximum fringe = 2(from the picture) and

λ = wavelength of light.

Thus sinθ = mλ/d

Also, tanθ = L/D where L = distance

between central maximum and fringe

Also, tanθ = L/D where

L = distance = 2.0 cm/2 = 1.0 cm =

1 x 10^-2 m and

D = distance between slit and screen = 2.0 m

Since θ is small, sinθ =~ tanθ

So, mλ/d=L/D

Making λ subject of the formula, we have

λ = dL/mD

Substituting the values of the variables into the equation, we have

λ = dL/mD

λ = 0.22 × 10^-3 m x 1 x 10^-2 m/(2 × 2.0 m)

λ = 0.22 x 10^-5 m²/4.0 m

λ = 0.055 x 10^-5 m

λ = 0.55 × 10^-6 m

λ = 550 × 10^-9 m

λ = 550 nm

Hence, wavelength of the light is 550 nm.

Learn more about Wavelength here:

https://brainly.com/question/10750459

#SPJ4

Answer: To let water drain between them

Explanation: If there was no gaps the water would biuld up when it rain and create puddles

Option C. The heat absorbed or lost by a substance while it's changing state  correctly describes latent heat

Latent heat is the heat absorbed or lost by a substance while it is changing state.

The latent heat is a type of heat that is transferred during phase change, i.e., while a substance undergoes a change of state.

For example, when ice melts into liquid water, or when liquid water evaporates into water vapor, heat is absorbed from the surroundings.

Latent heat is not associated with a temperature change; rather, it's associated with a change of state.

For instance, the temperature of water remains at 100°C while boiling.

When water is boiling, the latent heat of vaporization is absorbed and utilized to break the hydrogen bonds holding water molecules together to change water from the liquid phase to the gaseous phase.

When the water is boiling, adding more heat won't increase the water's temperature, instead, the extra heat will be absorbed to change the phase of water molecules.

Therefore, the correct answer to the given question is option C: The heat absorbed or lost by a substance while it is changing state.

For more questions on latent heat

https://brainly.com/question/10765874

#SPJ8

Answer:

600 N

Explanation:

The force exerted from the engine to maintain this forward acceleration is 600 N.

Force is defined in physics as: the push or pull on an object with mass that causes it to change velocity. Force is an external agent that can change the state of rest or motion of a body.

The term "force" has a specific meaning in science. At this level, it is perfectly acceptable to refer to a force as a push or a pull.

A force is not something that an object possesses or possesses. Another object applies a force to another.

We know that,

F = ma

Here, it is given that

Acceleration = 3 m/s

Mass = 200Kg.

So, by keeping the value

F = 200 x 3

F = 600 N

Thus, the force is 600 N.

For more details regarding force, visit:

https://brainly.com/question/13191643

#SPJ2

Answer:

e

Explanation:

Answer:

acoustic energy and mechanical energy

Explanation:

each type of sounds has to be tackled in their own way.

Answer:

See below

Explanation:

See diagram below

8 seconds to 60 m/s     then    60 m/s for 22 seconds then   to 0 m/s in 5 seconds

Answer:

\(\boxed {\boxed {\sf 115.15 \ J}}\)

Explanation:

Kinetic energy is the energy an object possesses due to motion. It is calculated with the following formula.

\(E_K= \frac{1}{2} mv^2\)

The mass of the object is 4.7 kilograms. The velocity of the object is 7 meters per second.

Substitute the values into the formula.

\(E_K= \frac{1}{2} (4.7 \ kg)(7 \ m/s)^2\)

Solve the exponent.

\(E_K= \frac{1}{2} (4.7 \ kg)(49 \ m^2/s^2)\)

Multiply the numbers together.

\(E_K = 2.35 \ kg * 49 \ m^2/s^2\)

\(E_K= 115.15 \ kg*m^2/s^2\)

Convert the units. 1 kilogram square meter per square second is equal to 1 Joule.

\(E_K= 115.15 \ J\)

The object has 115.15 Joules of kinetic energy.

Explanation:

Kinetic energy, \(\textbf{\textit{K}}\) is the energy associated with the state of motion of an object. This implies that as a particle accelerates by an external force, the kinetic energy possessed by the particle itself increases. Similarly, the kinetic energy of a particle decreases as an external force decelerates the particle and when the particle is stationary, it's kinetic energy is zero.

We account for such a change of kinetic energy as the energy transferred to the particle from an external force or from the particle to an external force, respectively. This transfer of energy, by a force \(\vec{F}\), is defined as the work done, W on the particle by the force \(\vec{F}\). Positive work denotes the energy transferred to the particle whereas negative work is the transfer of energy from the particle.

Hence, it is obvious that the concept of work and kinetic energy are related and this relationship is defined by the work-energy theorem. The theorem states that that the work done, W by all forces acting on a particle (the resultant force) equals the change in the kinetic energy of the particle, formally written as

                                                  \(W \ = \ \Delta K \\ \\ W\ = \ K_{\text{final}} \ - \ K_{\text{initial}}\)

Recall the kinematic equation for uniform acceleration,

                                               \({v_{\text{final}}}^{2} \ = \ {v_{\text{initial}}}^{2} \ + \ 2a\Delta x\).

For a moving particle, \(\Delta x \ = \ d\), where \(d\) is the displacement of the particle, and from Newton's second law of motion, we know that the acceleration \(a \ = \ \displaystyle\frac{F}{m}\). Hence,

                                      \({v_{\text{final}}}^{2} \ = \ {v_{\text{initial}}}^{2} \ + \ \displaystyle\frac{2Fd}{m} \\ \\ \displaystyle\frac{1}{2}m{v_{\text{final}}}^{2} \ - \ \displaystyle\frac{1}{2}m{v_{\text{initial}}}^{2}\right) \ = \ Fd\)

Additionally, work done, W on a particle by a constant force is the product of the component of the force in the direction of its displacement and the magnitude of the displacement.

                                                    \(W \ = \ Fd\).

Thus,

                                      \(W \ = \ \displaystyle\frac{1}{2}m{v_{\text{final}}}^{2} \ - \ \displaystyle\frac{1}{2}m{v_{\text{initial}}}^{2}\right)\),

in which

                          \(K_{\text{final}} \ = \ \displaystyle\frac{1}{2}m{v_{\text{final}}}^{2}\)   and    \(K_{\text{initial}} \ = \ \displaystyle\frac{1}{2}m{v_{\text{initial}}}^{2}\).

Therefore, in general, for a particle of mass m moving with a speed v, the kinetic energy of the particle is defined as

                                                        \(K \ = \ \displaystyle\frac{1}{2}mv^{2}\).

Substitute the known quantities into the expression above yields

                                              \(K \ = \ \displaystyle\frac{1}{2}(4.7 \ \text{g})(7 \ \text{m s}^{-1})^{2} \\ \\ K \ = \ 115.15 \ \text{J}\)

Answer:

The speed of the plane after it decelerates is 50 m/s

Explanation:

Motion with Constant Acceleration

When an object gains or losses velocity in time, it acquires acceleration. If this value is constant, we can calculate the final velocity (or speed in scalar terms) as:

\(v_f=v_o+at\)

Where vf is the final speed, vo is the initial speed, a is the constant acceleration, and t is the time the acceleration is acting.

The plane is originally traveling at vo=80 m/s and it slows down at a constant rate of \(a=-0.25\ m/s^2\) during t=120 seconds. Note we have added the negative sign to the acceleration because the plane is slowing down, i.e., the acceleration is against the speed.

Thus, the final speed is:

\(v_f=80-0.25*120\)

\(v_f=80-30=50\)

\(v_f = 50\ m/s\)

The speed of the plane after it decelerates is 50 m/s

The girl can go up the escalator by 2 meters in 2 minutes if a girl runs up the down escalator in the mall and escalator is moving with a velocity of 27 m/min and the girl is running with a velocity of 28 m/min,

When the girl runs up the down escalator, her effective velocity is the difference between her velocity and the velocity of the escalator. In this case, the escalator is moving down with a velocity of 27 m/min, while the girl is running up with a velocity of 28 m/min. So, her effective velocity is:

Effective velocity = Girl's velocity - Escalator's velocity

= 28 - 27

= 1 m/min

Therefore, the girl is moving up the escalator at a speed of 1 m/min.

To calculate how far up the escalator she can go in 2 minutes, we need to use the formula:

Distance = Speed x Time

In this case, the speed is the effective velocity of the girl, which is 1 m/min, and the time is 2 minutes. So, the distance she can go up the escalator is:

Distance = Speed x Time

= 1 x 2

= 2 meters

For more such questions on velocity:

https://brainly.com/question/17127206

#SPJ11

The dragonfly must generate approximately 4.8 × 10^-4 Joules of energy to spin itself at a rate of 1100 rpm.

Start by converting the rotational speed from rpm (revolutions per minute) to rad/s (radians per second). Since 1 revolution is equal to 2π radians, we can use the conversion factor:

Angular speed (ω) = (1100 rpm) × (2π rad/1 min) × (1 min/60 s)

ω ≈ 115.28 rad/s

The moment of inertia (I) is given as 2.0 × 10^-7 kg⋅m².

Use the formula for rotational kinetic energy:

Rotational Kinetic Energy (KE_rot) = (1/2) I ω²

Substituting the given values:

KE_rot = (1/2) × (2.0 × 10^-7 kg⋅m²) × (115.28 rad/s)²

Calculate the value inside the parentheses:

KE_rot ≈ (1/2) × (2.0 × 10^-7 kg⋅m²) × (13274.28 rad²/s²)

KE_rot ≈ 1.331 × 10^-3 J

Round the result to the proper number of significant figures, which in this case is three, as indicated by the given moment of inertia.

KE_rot ≈ 4.8 × 10^-4 J

Therefore, the dragonfly must generate approximately 4.8 × 10^-4 Joules of energy to spin itself at a rate of 1100 rpm.

For more such questions on energy, click on:

https://brainly.com/question/8101588

#SPJ8

The total distance covered by the car is 300 miles.

The total displacement covered by the car is zero.

The average speed of the car is 17.88 m/s.

The average velocity of the car is also zero.

Distance between the points A and B, d = 150 miles

Time taken by the car to travel from A to B, t₁ = 3 hours

Time taken by the car to travel from B to A, t₂ = 5 hours

a) Given that the car travelled from A to B and then back to A.

Therefore, the total distance covered by the car is,

Distance = 2 x d

Distance = 2 x 150

Distance = 300 miles

Since the car is travelling from A to B and then returning back to the initial point A, the total displacement covered by the car is zero.

b) The speed with which the car travelled from A to B is,

v₁ = d/t₁

v₁ = 150/3

v₁ = 50 miles/hr

v₁ = 22.35 m/s

The speed with which the car travelled from B to A is,

v₂ = d/t₂

v₂ = 150/5

v₂ = 30 miles/hr

v₂ = 13.41 m/s

Therefore, the average speed of the car is,

v = (v₁ + v₂)/2

v = (22.35 + 13.41)/2

v = 17.88 m/s

As, the total displacement of the car is zero, the average velocity of the car is also zero.

To learn more about average speed, click:

https://brainly.com/question/10449029

#SPJ1

Answer:

Half

Explanation:

If the half life of an isotope is 20 years, then half of the original amount will  remain after 20 years has passed.

That's what "half-life" means.

Similarly, after ANOTHER 20 years, 1\4 of the original amount remains.

And after ANOTHER 20 years, 1\8 of the original amount remains.

And after ANOTHER 20 years, 1\16 of the original amount remains.

And after ANOTHER 20 years, 1\32 of the original amount remains.

And after ANOTHER 20 years, 1\64 of the original amount remains.

And after ANOTHER 20 years, 1\128 of the original amount remains.

The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now—and it is still stretching!

What's This Big Bang All About?

In 1927, an astronomer named Georges Lemaître had a big idea. He said that a very long time ago, the universe started as just a single point. He said the universe stretched and expanded to get as big as it is now, and that it could keep on stretching.

What an Idea!

The universe is a very big place, and it’s been around for a very long time. Thinking about how it all started is hard to imagine.

Some More Information

Just two years later, an astronomer named Edwin Hubble noticed that other galaxies were moving away from us. And that’s not all. The farthest galaxies were moving faster than the ones close to us.

This meant that the universe was still expanding, just like Lemaître thought. If things were moving apart, it meant that long ago, everything had been close together.

Everything we can see in our universe today—stars, planets, comets, asteroids—they weren't there at the beginning. Where did they come from?

A Tiny, Hot Beginning

When the universe began, it was just hot, tiny particles mixed with light and energy. It was nothing like what we see now. As everything expanded and took up more space, it cooled down.

The tiny particles grouped together. They formed atoms. Then those atoms grouped together. Over lots of time, atoms came together to form stars and galaxies.

The first stars created bigger atoms and groups of atoms. That led to more stars being born. At the same time, galaxies were crashing and grouping together. As new stars were being born and dying, then things like asteroids, comets, planets, and black holes formed!

B) A pendulum is a mass suspended on the bottom of a string.

A pendulum is a simple mechanical device that consists of a mass (known as the bob) suspended from a fixed point by a string, wire, or rod. When the bob is pulled to one side and released, it swings back and forth under the influence of gravity, forming a regular pattern of motion. The time it takes for the pendulum to complete one full swing (i.e., from one extreme position to the other and back again) is known as its period. The period of a pendulum is affected by the length of the string and the strength of gravity. The longer the string, the longer the period, and the stronger the gravity, the shorter the period.Pendulums have a wide range of practical applications, such as timekeeping, as seen in grandfather clocks. They are also used in scientific experiments to measure time intervals and gravitational acceleration.

for more questions on mass

https://brainly.com/question/86444

#SPJ11

There is more to the Earth than what we can see on the surface. In fact, if you were able to hold the Earth in your hand and slice it in half, you'd see that it has multiple layers. But of course, the interior of our world continues to hold some mysteries for us. Even as we intrepidly explore other worlds and deploy satellites into orbit, the inner recesses of our planet remains off limit from us.

However, advances in seismology have allowed us to learn a great deal about the Earth and the many layers that make it up. Each layer has its own properties, composition, and characteristics that affects many of the key processes of our planet. They are, in order from the exterior to the interior – the crust, the mantle, the outer core, and the inner core. Let's take a look at them and see what they have going on.

Like all terrestrial planets, the Earth's interior is differentiated. This means that its internal structure consists of layers, arranged like the skin of an onion. Peel back one, and you find another, distinguished from the last by its chemical and geological properties, as well as vast differences in temperature and pressure.

Explanation:

Answer:

290

Explanation:

I tried not so certain abt the answer

Answer:

Explanation:

Givens

Mass: 1450 kg

vi = 0

a = 5 m/s^2

vf=?

Formula

KE = 1/2 m v^2

d = vi * t + 1/2 a t^2

a = (vf - vi)/t

Solution

The final KE = 0 because the final velocity = 0 (The concrete wall saw to that).

Second formula

d = vi*t  + 1/2 a t^2

20  = 0 + 1/2 * 5 * t^2

40 = 5*t^2                         Divide by 5

40/5 = t^2

8 = t^2

2√2 = t

Third formula

5 = (vf - 0)/2√2                Multiply by 2√2

5* 2√2 = vf

10√2= vf

First formula

KE = 1/2 m * (10√2)^2

KE = 1/2 1450 * 100*2

KE = 1450 * 100              2 and 1/2 cancel out.

KE = 145000

This means that the change in KE is 145000 Joules or 145 kJ

Answer:

c

Explanation:

Find resultant V

V = √(Vh² + Vv²)

Thus input the values.

Am sorry, i don't have a calculator in hand but that's the formula and when you obtain the answer, the magnitude is the numerical value obtained and the direction will be based on the interger of the numerical value.

Answer:

Workdone = 25500Nm

Explanation:

Given the following data

Force = 425N

Distance = 60m

To find the workdone

Workdone = force *distance

Substituting into the equation, we have

Workdone = 425*60

Workdone = 25500Nm

Answer:

The greater weight increases the terminal velocity by acting as an extra force against gravity and air resistance.

Answer: Plates shifting

Explanation: After years and years of plates colliding into solid rock, they slowly become closer together. As recent studies have shown, Africa is currently moving closer to Europe one centimeter every year (one inch every 2.5 years).

Answer:

nvudbwasivnjlscv bwbfvsz

Explanation:

Answer:

true

Explanation:

I believe the answer i chose because the earths atmosphere is mostly made up of different things that causes the earth to interact with human life and also interacts with what's in the atmosphere like energy oxygen carbon dioxide and all the stuff like that i hope its right.

Answer:

Options B

Explanation:

The appropriate quantitative research method for understanding political views held by the young population of a specific area is written surveys (option b). Surveys allow for the collection of data from a large number of participants, and specific questions can be asked to gather data on political views.

Participant observation (option a) involves direct observation of individuals in a natural setting, which may not be practical for studying political views.

Secondary data analysis (option c) involves analyzing data that has already been collected, and may not be specific to the young population or the area of interest.

Laboratory experiments (option d) are typically used to study cause-and-effect relationships between variables, which may not be applicable to studying political views.

Therefore, the best option for understanding the political views held by the young population of a specific area is written surveys.

To understand the political views of the young population of a specific area, a researcher can use written surveys, participant observation, and secondary data analysis as quantitative research methods.

If a researcher is trying to understand the political views held by the young population of a specific area, they should use written surveys, participant observation, and secondary data analysis as quantitative research methods.

https://brainly.com/question/33505242

#SPJ2

Answer:

D. Bulb 2 will go out but bulbs 1 and 3 will remain lit.

Explanation:

If switch at B is opened then, Bulb 2 will go out but bulbs 1 and 3 will remain lit. This is because the positive and negative current flow still fully passes through the two closed switches at switch A and C which allows the bulbs to receive both currents and thus allowing it to turn on. When Switch B is opened it cuts off access for the negative charge to get to bulb 2 and without it, bulb 2 will not turn on.

Answer:all 3 bulbs will go out

Explanation:

Just did it and got it right

Answer:

1) The mass of the continent is approximately \(1.608\times 10^{21}\) kilograms.

2) The kinetic energy of the continent is approximately \(8.04\times 10^{16}\) joules.

3) The speed of the 77 kg-jogger would be approximately \(45.698\times 10^{6}\) meters per second.

Explanation:

1) The mass of the North American continent can be estimated by using the following formula under the assumption that rock has an uniform density:

\(m = \rho \cdot L^{2}\cdot h\) (1)

Where:

\(m\) - Mass of the continent, measured in kilograms.

\(\rho\) - Average density of the rock, measured in kilograms per cubic meter.

\(L\) - Side of the continent, measured in meters.

\(h\) - Depth of the continent, measured in meters.

If we know that \(\rho = 2620\,\frac{kg}{m^{3}}\), \(L = 4.450\times 10^{6}\,m\) and \(h = 31\times 10^{3}\,m\), then the mass of the continent is:

\(m = \left(2620\,\frac{kg}{m^{3}} \right)\cdot (4.450\times 10^{6}\,m)^{2}\cdot (31\times 10^{3}\,m)\)

\(m = 1.608\times 10^{21}\,kg\)

The mass of the continent is approximately \(1.608\times 10^{21}\) kilograms.

2) By assuming that continent can be represented as a particle, we define its kinetic energy as:

\(K = \frac{1}{2}\cdot m \cdot v^{2}\) (2)

Where:

\(K\) - Translational kinetic energy, measured in joules.

\(v\) - Motion rate of the continent, measured in meters per second.

If we know that \(m = 1.608\times 10^{21}\,kg\) and \(v = 1\times 10^{-2}\,\frac{m}{s}\), then the kinetic energy of the continent is:

\(K = \frac{1}{2}\cdot (1.608\times 10^{21}\,kg)\cdot \left(1\times 10^{-2}\,\frac{m}{s} \right)^{2}\)

\(K = 8.04\times 10^{16}\,J\)

The kinetic energy of the continent is approximately \(8.04\times 10^{16}\) joules.

3) The speed of the jogger is derived from the definition of translational kinetic energy:

\(v = \sqrt{\frac{2\cdot K}{m} }\)

If we know that \(K = 8.04\times 10^{16}\,J\) and \(m = 77\,kg\), then the expected speed of the jogger is:

\(v = \sqrt{\frac{2\cdot (8.04\times 10^{16}\,J)}{77\,kg} }\)

\(v\approx 45.698\times 10^{6}\,\frac{m}{s}\)

The speed of the 77 kg-jogger would be approximately \(45.698\times 10^{6}\) meters per second.