Explain why ""human error"" is a poor explanation for error.

The gravitational potential energy stored in the wall is 627J

Gravitational potential energy is the energy that an object has or gains as a result of a change in its position while in a gravitational field. Gravitational potential energy is energy that is related to gravitational force.

Given

A retaining wall in the backyard is built with forty 2.0kg blocks that are 20.0cm thick. Each row of the wall will have ten blocks. You might guess that the first block is at the top.

we have to determine the gravitational potential energy stored in the wall

By using the equation Eg=mgh

To find mass(m) = 40 x 0.2

= 80kg

To find height(h) = 20c m = 0.2x0.2x4

= 0.8m

= 80kg

So I used 4 because the wall will be four rows high

Eg = 80x0.8x9.8

= 627J

Therefore the gravitational potential energy stored in the wall is 627J

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The activity of the source in Becquerel is 333.3Bq

The number of nuclei that disintegrate or decay per unit time is known as Activity.

Given that a sample of radioactive material emits 400000 particles over a period of 20 minutes.

Activity A = dN/dt

A = 400000 / 1200

A = 333.3 particles / s

A = 333.3 Bq

Therefore,

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Answer: c a d b

Explanation:

Glaciologists use Glen–Nye Flow Law, to predict the movements of glaciers thus, The pattern they predict in the markers over time would be C D A B.

In some parts of the world, glaciers are an important natural resource because the nature and behaviour of glaciers are an impact the hydrologic, geologic, and ecological systems of their immediate location.

Due to this, Glaciologists monitor and try to predict the movement and morphology of glaciers.

One of the techniques used by "Glaciologists" in the monitoring and prediction of glaciers in the use of markers.

The movement of markers is measured relative to the edges of the valley down which the glacier flows.

Thus, The movement of the markers are then predicted using the Glen–Nye Flow Law.

The pattern they predict in the markers over time would be C D A B.

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60 miles / hr

= 60 * 1.6 * 1000  m / 60 * 60 s

= 96000 m / 3600 s

= 26.67 m / s

Answer:

216.32kN

Explanation:

Force can be expressed according to the formula;

Force = mass ×acceleration

Given

Mass = 1250kg

Velocity = 4.16m/s

Distance = 0.05m

We can get the acceleration first using the equation of motion

v² = u²+2as

4.16² = 0²+2a(0.05)

17.3056 = 0.1a

a = 17.3056/0.1

a = 173.056m/s²

Get the force required

Force = 1250×173.056

Force = 216,320N

Force = 216.32kN

Hence the force constant of the material is 216.32kN

Answer:

h = 4.25 m

Explanation:

\(gravitational \space\ potential \space\ energy \space\ (gpe)= m g h\\\) ,

where m is the mass, g is acceleration of gravity, and h is height of object.

In our case, m = 1.2 kg, g = 9.8m/s², and gpe = 50 J.

50 = 1.2 x 9.8 x h

h = 50 / (1.2 x 9.8)

h = 4.25 m

Answer:

4.25m

Explanation:

Joules is a "derived unit", meaning it is really composed of other units, and it is just abbreviated as a single letter.

\(1[J]=1 [\frac{kg \cdot m^2}{s^2}]\)

This comes from the formula for potential energy, often denoted "U"

\(U=mgh\), where m is the mass of the object (measured in kilograms,  \(kg\)), g is the acceleration due to gravity at that spot (measured in meters per second squared,  \(\frac {m}{s^2}\)), and h is the height of the object (measured in meters, \(m\)).

Note:  The object itself may or may not have an acceleration of "g" at the given point because it may be supported (like on a bookshelf).  However, the "g" is representative of its gravitational acceleration at that point if gravity could accelerate it unimpeded.

Rearranging the potential energy equation to isolate the unknown "h", dividing both sides by "m" and "g", we get the following:

\(\dfrac{U}{mg}=h\)

Substituting known values (and rewriting Joules as its SI units so we can ensure units cancel the way we need them to):

\(\dfrac{\left (50 [\frac{kg \cdot m^2}{s^2}] \right)}{(1.2 [kg])(9.8 [\frac{m}{s^2}])}=h\\\dfrac{\left (50 [\frac{kg \!\!\!\!\!\!\!{--} \cdot m^{2 \!\!\!{-}}}{s^2\!\!\!\!\!\!\!{--} }] \right)}{(1.2 [kg \!\!\!\!\!\!\!{--} ])(9.8 [\frac{m\!\!\!\!\!\!\!{--} }{s^2\!\!\!\!\!\!\!{--} }])}=h\\\dfrac{(50)}{(1.2)(9.8)}[m]=h\\\\4.2517[m] \approx h\)

Thus, the height of the book would be approximately 4.25meters high.

Hello, use the formula:

Pe = mgh

Data:

Pe = Potential energy = ¿?

m = Mass = 48 kg

g = Gravity = 9,81 m/s²

h = Height = 7 m

Replacing according our data:

Pe = 48 kg * 9,81 m/s² *  7 m

Pe =3296,16 J

The potential energy of the skateboarder is 3296,16 Joules

Answer:

Magnetization is the density of magnetic dipole moments that are induced in a magnetic material when it is placed near a magnet. ... Magnetization is also known as magnet polarization.

Answer:

The correct option is C

Explanation:

According to third equation of motion, v

2

=u

2

+2ax

Here, u=0 m/s

a=−g and x=−h

Negative sign indicates downward direction. Displacement and acceleration both are downwards.

So,v=±

2(−g)(−h)

​

We take minus sign because it is downwards.

v=−

2gh

​

After bouncing. velocity becomes 80% of v, i.e.,

v

′

=+0.8

2gh

​

(positive sign because the direction of ball has reversed after bouncing and is upwards.

Applying third equation of motion again, for u=v

′

, v=0 and a=−g

v

2

=u

2

+2×a×x

Thus,

0=0.64(2gh)+2(−g)x

or

x=0.64h

A ball is dropped from some height. It bounces off the floor and rebounds with a speed that is one-half the speed it had just before it struck the floor. Since the rebound speed is one-half the speed it had just before hitting the floor, it will rise to 1/4 of the original height from which it was dropped.

Rebound speed refers to the speed at which a body when it hits a surface is returned or rebounded to the original direction in which it comes from.

When objects are released from a height and allowed to hit the floor, some of the original energy of the object is converted to heat and sound, thus the object will rebound with a lesser speed and to a smaller height than from which it is released. Thus, it can be illustrated using the rubber ball.

In the case of a rubber ball which is dropped on the floor. The rebound speed is one-half the speed it had just before hitting the floor.

Therefore, the height will be one-quarter the original height.

In conclusion, the rebounding of a ball is to a lesser height than the original height.

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Answer: Acceleration = Force/Mass

Explanation:

F = ma

a = F/m

Acceleration = Force/Mass

The Young's modulus for a 3D crystal can be estimated using the group velocity equation for 1D crystals by making the following assumptions:

The equation for Young's modulus in a 3D crystal is then: E = ρ v2, where ρ is the mass density and v is the group velocity.

The group velocity can be estimated using the group velocity equation for 1D crystals: v = (dω/dK)-1. Here, ω is the angular frequency and K is the wave vector.

By combining these two equations, the Young's modulus for a 3D crystal can be estimated using the group velocity equation for 1D crystals.

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Answer:

Violet, blue, green, yellow, orange, red

Explanation:

I just took the astronomy quiz, I got it right

Answer:

1) 800m/s

2) 2 seconds

Explanation:

Acceleration= velocity/time

Where acceleration= 0.5 m/s²

Time= 1.6kms= 1.6×10^3 seconds

If we substitute we have

0.5=v/(1.6×10^3)

V=800m/s

the final velociety of the car is 800m/s

Velocity= distance/time

800= (1.6×10^3)/ time

Time= 1.6×10^3/800

=2 seconds

Hence the time it will take to cover is 2seconds

The correct  option is D, A material in which electrons are able to move easily conductor.

A conductor is a material or substance that allows for the flow of electric charge. This is due to the presence of free electrons within the material, which are not bound to specific atoms and are able to move easily in response to an electric field. Conductors are widely used in electrical circuits, where they are used to transport electricity from one place to another with minimal loss of energy.

Conductors are typically characterized by their ability to conduct electricity, which is measured by their electrical conductivity. This property is determined by a number of factors, including the nature of the material, its temperature, and the strength of the electric field. Some common examples of conductors include metals such as copper, aluminum, and gold, as well as certain non-metallic materials like graphite.

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Answer:

\( \boxed { \tt{gravitational \: pull(force)}}\)

Answer:41xm/s

Explanation:

Answer:41xm/s

Explanation:

I found this for you hope it helps.

Answer:

B: a 50-g fish swimming in a fish tank.

Explanation:

I chooses B because kinetic energy is energy present in moving bodies or objects. And the fish swimming has kinetic energy because it is moving

Answer:

Both have the same horizontal velocity.

Ball A will take longer to reach the ground.

Ball A will travel farther.

Both have the same horizontal velocity like Ball A will take longer to reach the ground and Ball A will travel farther.

velocity can be defined as the rate of change of the object’s position with respect to  reference and which is complicated but velocity is basically speeding in a specific direction.

Velocity is nothing but a vector quantity means both magnitude (speed) and direction are needed to define velocity. The SI unit of velocity is meter per second (ms-1) and if  magnitude or the direction of velocity of a body changes, then it will be said to be accelerating.

Speed and velocity are the two closest term and can be a little confusing but the major difference between speed and velocity is that speed gives us an idea of the rate of faster movement of an object where as  velocity  speed up as well as   tells us the direction the body

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Answer:

External locus of control

Explanation:

External locus of control is an attitude people possess that makes them attribute their failures or successes to factors other than themselves. The opposite of this type of attitude is the Internal locus of control where the individuals take responsibility for the outcomes of their actions whether good or bad. One good thing about the external locus of control is that when the individuals with this characteristic record successes, they attribute it to others and this presents them as people with team spirit. However, when they record failures, they do not want to take the blame, but rather attribute it to others.

Fred exhibits an external locus of control because he attributed his speeding to other factors like the road signs and GPS instead of fully admitting that it was his fault.

In basin and range topography, the lowest areas are frequently occupied by a(n)  basin.

Basin and range topography is a geological feature characterized by alternating mountain ranges and elongated valleys or basins. The formation of this topography is attributed to the stretching and faulting of the Earth's crust, which leads to the uplift of mountains and the subsidence of adjacent basins.

The lowest areas in this type of topography are often occupied by basins, which are elongated depressions or low-lying regions. These basins typically collect sediment and water, forming flat or gently sloping landscapes. They can range in size from small valleys to extensive lowland areas.

The basins are important features of the basin and range topography and contribute to the unique landscape and hydrological characteristics of the region.

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The correct statements of an electric field are: (a) Its electric potential energy increases as it goes from high to low potential. (d) Its kinetic energy decreases as it moves in the direction of the electric field.

(a) When an electron moves from a region of high electric potential to a region of low electric potential, its electric potential energy increases. This is because the electron experiences a change in potential energy due to the electric field. Moving in the direction of the electric field, the electron gains potential energy. (d) As the electron moves in the direction of the electric field, its kinetic energy decreases. This is because the electric field does work on the electron, converting its kinetic energy into potential energy. The electron loses kinetic energy as it accelerates in the direction of the field. (c) and (e) are incorrect statements. The potential energy and kinetic energy of the electron are not directly related in this context. While the electron's potential energy may change, its kinetic energy does not necessarily follow a predictable pattern solely based on the direction of the electric field.

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The local drift speed of electrons at that point in the copper conductor is approximately -3.3 x 10^-5 m/s. The negative sign in the answer indicates that the electrons are moving in the opposite direction to the conventional current flow.

The relationship between current density (J), charge carrier density (n), charge of each carrier (q), and the local drift velocity (vd) of the charge carriers is given by:

J = n x q x vd

where:

J = current density (A/m²)

n = charge carrier density (1/m³)

q = charge of each carrier (C)

vd = local drift velocity (m/s)

In the case of copper, the charge carriers are electrons and the charge of each electron is q = -1.602 x 10⁻¹⁹ C. The charge carrier density in copper is typically on the order of 8.5 x 10²⁸ electrons/m³.

Plugging in the given values, we have:

480 A/m² = (8.5 x 10²⁸ electrons/m^3) ₓ (-1.602 x 10⁻¹⁹ C/electron) ₓ vd

Simplifying this equation, we get:

vd = 480 A/m² / ((8.5 x 10^28 electrons/m³) ₓ (-1.602 x 10⁻¹⁹ C/electron))

vd = -3.3 x 10⁻⁵ m/s

Note that the negative sign in the answer indicates that the electrons are moving in the opposite direction to the conventional current flow. Therefore, the local drift speed of electrons at that point in the copper conductor is approximately -3.3 x 10⁻⁵ m/s.

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Answer:

c

Explanation:

because what else can the laser be used for

Question :-

Answer :-

\( \rule {180pt} {2pt} \)

Given :-

To Find :-

Solution :-

As per the provided information in the given question, we have been given that Force is 10 Newton and Displacement is given 50 meter . And, we have been asked to calculate the Work done .

For calculating the Work , we will use the Formula :-

Therefore , by Substituting the given values in the above Formula :-

⇒ Work = Force × Displacement

⇒ Work = 10 × 50

⇒ Work = 500

Hence :-

\( \underline {\rule {180pt} {4pt}} \)

According to the given statement Mrs. Brown's electricity bill for the current month is $5000.00.

To calculate Mrs. Brown's electricity bill for the current month, we need to determine the total number of kilowatt-hours (kWh) she has consumed and apply the corresponding rates.

1. Calculate the electricity usage:

  Current meter reading - Previous meter reading
  20,300 kWh - 17,800 kWh = 2,500 kWh

2. Determine the cost for the first 2000 kWh:

  $1.00/kWh * 2000 kWh = $2000.00

3. Determine the cost for the remaining kWh:

  500 kWh * $3.50/kWh = $1750.00

4. Add the fuel adjustment charge:

  $0.50/kWh * 2500 kWh = $1250.00

5. Calculate the total bill:

  $2000.00 + $1750.00 + $1250.00 = $5000.00


To calculate the electricity bill, we first find the difference between the current and previous meter readings.

In this case, Mrs. Brown used 2,500 kWh.

For the first 2000 kWh, the cost is $1.00 per kWh, resulting in a charge of $2000.00.

For the remaining 500 kWh, the cost is $3.50 per kWh, totaling $1750.00.

Additionally, a fuel adjustment charge of $0.50 per kWh is added to the bill. This amounts to $1250.00.

Finally, we add up all the charges to get the total bill, which is $5000.00.

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Given

mj = 65 kg

mc = 78 kg

voj = 5.75 m/s

after collision

vfj = vfc = 0 m/s

Procedure

The law of momentum conservation can be stated as follows. For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.

The velocity before the collision would be 4.8m/s