find an expression for the magnitude of the electric field that enables the block to remain at rest.

To find the horizontal and vertical components of the tension force in para sailing, we can use the basic trigonometric ratios of sine, cosine and tangent.

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All the equations of motion are as follows, Displacement (s) equation, Final velocity (v) equation, Average velocity (v_avg) equation, Displacement (s) equation with average velocity, and Displacement (s) equation.

In terms of its motion as a function of time, equations of motion define how a physical system behaves. In more detail, the equations of motion define how a physical system behaves as a collection of mathematical functions expressed in terms of dynamic variables.

In conclusion, equations of motion define how a physical system behaves in terms of how its motion changes over time.

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This question is incomplete, the complete question is;

Model a hydrogen atom as a three-dimensional potential well with U₀ = 0 in the region 0 < x < L, 0 < y < L and 0 < z < L, and infinite otherwise, with L = 1.0 × 10⁻¹⁰ m.

Which of the following is NOT one of the lowest three energy levels of an electron in this model?

a. 283 eV

b. 339 eV

c. 113   eV  

d. 226 eV        

Answer:

the lowest three energy are; 113 eV, 225 eV, and 339 eV.

Hence Option a) 283 eV is not among the three lowest energy

Explanation:

Given the data in the question;

Three dimension cube or particle in a cubic box

the energy value is given by;

\(E_{nx,ny,nz\) = \(( n_x^2 + n_y^2 + n_z^2 )\) × π²h"² / 2ml²

where h" = h/2π and h is Planck's constant ( 6.626 × 10⁻³⁴ m² kg / s )

m is mass of electron ( 9.1 × 10⁻³¹ kg )

l is length of side of box ( 1.0 × 10⁻¹⁰ m )

for ground level ( \(n_x = n_y = n_z = 1\) )

so

\(( n_x^2 + n_y^2 + n_z^2 )\) ×  π²h"² / 2ml²

since h" = h/2π

\(( n_x^2 + n_y^2 + n_z^2 )\) × π²h² / (2π)²2ml²

so we substitute

\(E_{111\) = ( 1² + 1² + 1² ) × [ π²( 6.626 × 10⁻³⁴ )² ] / [ (2π)² × 2 × 9.1 × 10⁻³¹ kg × ( 1.0 × 10⁻¹⁰)² ]

\(E_{111\) = 3 × [ (4.333188779 × 10⁻⁶⁶) / ( 7.185072 × 10⁻⁴⁹ ) ]    

\(E_{111\) = 3 × [ 6.03082165 × 10⁻¹⁸ ]

Now, we know that electric charge = 1.602 x 10⁻¹⁹

so

\(E_{111\) = 3 × [ (6.03082165 × 10⁻¹⁸) / (1.602 x 10⁻¹⁹) ]

\(E_{111\) = 3 × [ 37.645578 ]

\(E_{111\) = 112.9 ≈ 113 eV

\(E_{211\) = \(( n_x^2 + n_y^2 + n_z^2 )\)  × π²h² / (2π)²2ml²

we substitute

\(E_{211\) = ( 1² + 1² + 2² ) × [ 37.645578 ]

\(E_{211\) = 6 × [ 37.645578 ]

\(E_{211\) = 225.87 ≈ 226 eV

\(E_{221\) = \(( n_x^2 + n_y^2 + n_z^2 )\)  × π²h² / (2π)²2ml²

we substitute

\(E_{221\) = ( 2² + 2² + 1² ) × [ 37.645578 ]

\(E_{211\) = 9 × [ 37.645578 ]

\(E_{211\) = 338.8 ≈ 339 eV

Therefore, the lowest three energy are; 113 eV, 225 eV, and 339 eV.

Hence Option a) 283 eV is not among the three lowest energy

The mass number of an element is the total number of protons and neutrons in the nucleus of the atom.

Mass number is the total number of protons and neutrons in an atomic nucleus with symbol: A.

An atom is the smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.

The atom of an element is made up of the following subatomic particles;

The sum of the proton and neutron in the atom's nucleus is the atom's mass number.

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The work-energy theorem states that the change in the kinetic energy of an object will be equal to the net work done on the object.

Mathematically, it can be expressed as;

ΔKE = W

Where; ΔKE represents the change in kinetic energy of the object,

W represents the net work done on the object.

This theorem states that when work is done on an object, it results in a change in its kinetic energy. If work is done on an object, its kinetic energy increases, and if work is done by an object, its kinetic energy decreases.

This theorem is a fundamental principle in physics that relates the concepts of work and energy, and it is often used to analyze the motion and behavior of objects in various physical systems.

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(a) The distance  the car travels during your reaction time is 2.83 m.

(b) The total distance traveled by the car before stopping is 97.8 m

To find the distance traveled during the reaction time, we need to find the velocity after the reaction time and then use it to find the distance traveled.

78 km/h = 78,000 m/h ÷ 3600 s/h = 21.67 m/s

After the reaction time, the velocity is equal to the initial velocity plus the acceleration during the reaction time:

v = v₀ + at

v = 21.67 m/s - (4.6 m/s²)(0.130 s)

v = 21.67 m/s - 0.599 m/s

Finally, the distance traveled during the reaction time is given by:

d = v₀t  + ¹/₂at²

d  = 21.67  x 0.130 s    +    ¹/₂(-4.6) x (0.130)²

d = 2.83 m

B) To find the total distance traveled before stopping, we need to find the time it takes for the velocity to reach 0.

The velocity after the reaction time is equal to 21.67 m/s - 0.599 m/s = 21.07 m/s.

Using the equation v = v₀ + at, we can find the time it takes to come to a stop:

t = -v₀ / a

t = -21.07 / -4.6

t = 4.58 s

The total distance traveled can be found using the equation:

d =  v₀t  + ¹/₂at²

d  = 21.67 x 4.58  + ¹/₂(-4.6) x 4.58

d = 97.8 m

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Answer:

Explanation:

according to the graph at B the potential energy of the particle is 2J

therefore we can use the kinetic energy equation to calculate the particle's velocity or speed.

\(E_{k} =1/2mv^{2}\)

2J= 1/2*1/2kg*v^2

8=v^2

v= 2√2 ms-1

Answer:

The object has decreasing acceleration and decreasing velocity.

Answer:

beacause it's contracts

Explanation:

when using a large bottomed glass the hot water cools that's why is good to use thin bottomed glass

Both the eggs have the same value of velocity and the same value of mass.

As the momentum of the body in terms of mass and velocity is,

The mass and velocity of both the eggs are the same, thus, the value of momentum for both the eggs is also the same.

The initial kinetic energy of the body is,

Thus, the kinetic energy of both the eggs also remains same.

Hence,

Answer:

a

Explanation:

How long would it take a machine to do 5.000

joules of work if the power rating of the machine

is 100 watts?

The given machine will take 50 s to complete the work. the power is the rate of performing work.

It can be defined as the rate of performing work. It can also be written as the amount of work divided by the time it takes to complete the work.

\(p = \dfrac wt\)

So

\(t = \dfrac w p\)

Where,

\(p\) - power = 100 watt  = 100 J/s

\(t\) - time = ?

\(w\)- work = 5000 J

Put the values in the formula,

\(t = \dfrac{ 5000 \rm \ J} {100 \rm \ J/s}\\\\t = 50 \rm \ s\)

Therefore, the given machine will take 50 s to complete the work.

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Answer:

An object moves in a straight line along a horizontal surface. so it determined so video with me this movement

Explanation:

the distance from A to B is the displacement i.e

addistion of the x components to addition of y components

summation Y: sin75 * 60 - sin 45 *50 = 15.529

summation X: cos75 *60 + sin 45 *50 =50.884

then

\( \sqrt{x { \: }^{2} + y^{2} } = 76.375\)

along 16° 58' north of easf

The vehicle's speed is  \(\mu g r\)

When the car is in drive, all the forces are in

\(F_N cos\theta =mg + \mu_s\ F_N sin\theta\)

It is a situation in which opposing forces or actions are in equilibrium and can be either static

like when forces act on a body and the resultant is zero or dynamic as in a reversible chemical reaction when the rates of reaction in both directions are equal

The state of equilibrium is one in which the forward and backward rates of response are equal.

equilibrium and harmony the vertical axis equation should be

\(F_N cos\theta +\mu_s F_N cos\theta =\frac{mv^2}{R}\)

and along the horizontal axis,

\(F_N\) = normal force= mg

solving equations 1 and 2 as a pair

\(v^2= \frac{(\mu_s \ cos\theta + sin\theta)Rg}{cos\theta - \mu_s sin \theta}\)

in order to bank \(\theta = 0\)

= \(\mu_s Rg\)

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The current in the circuit 25 µs later, given that the switch is changed to position "b" is 0.36 A

From the question given above, the following data were obtained:

The current in the circuit can be obtain as illustrated below:

Q = It

But,

Q = CV

Thus,

It = CV

I × 25×10⁻⁶ = 1×10⁻⁶ × 9

I × 25×10⁻⁶ = 9×10⁻⁶

Divide both sides by 25×10⁻⁶

I = 9×10⁻⁶ / 25×10⁻⁶

I = 0.36 A

Thus, from the above calculation, we can conclude that the current in the circuit is 0.36 A

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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.

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Answer:

real depth / apparent depth = R.I.

Real depth = 1.5 x 1 = 1.5 m

Answer:

i) Mr. Dunn arrives to home first.

ii) 3 min

Explanation:

i. To find who arrives first to home you calculate the time, by using the following formula:

\(t=\frac{x}{v}\)

x: distance

v: velocity

Mr. Dunn:

\(t=\frac{64.8km}{48km/h}=1.35h\)

Mrs. Dunn:

\(t=\frac{81.2km}{58km/h}=1.4h\)

Hence, Mr. Dunn arrives to home first.

ii. To calculate the difference in minutes, you convert hours to minutes:

\(1.35h*\frac{60min}{1h}=81min\\\\1.40h*\frac{60min}{1h}=84min\\\\\Delta\ t=(84-81)min=3min\)

the difference between the times is 3min

(i) Mr. Dunn takes less time so he arrives at home first.

(ii) The second person arrives 3 min late.

(i) We have to calculate the time taken to reach home by Mr. Dunn and Mrs. Dunn.

t = x/v

where x is the distance

and v is the velocity

Time taken by Mr. Dunn:

distance x = 64.8 km

speed v  = 48 km/h

t = 64.8 / 48

t = 1.35 h

Time taken by Mrs. Dunn:

distance x = 81.2 km

speed v  = 58 km/h

t' = 81.2 / 58

t' = 1.4 h

Hence, Mr. Dunn arrives at home first.

(ii) To calculate the difference in minutes, you convert hours to minutes:

The time taken by Mr. Dunn in minutes is:

t = 1.35×60 = 81 minutes

The time taken by Mrs. Dunn in minutes is:

t' = 1.4×60 = 84 minutes

the difference between the times is 3min

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Answer:

Explanation:

the answer is b

The physics behind the movement of electric charges between parallel plates is based on the principles of electrostatics. Electric charges are either positive or negative, and they are affected by electric fields.

Electric fields are created by a difference in electric potential, which is measured in volts. When a voltage is applied to a set of parallel plates, the charges within the plates will be affected by the electric field, and will move in response to it.

When a voltage is applied to a set of parallel plates, the positive charges in the plate connected to the positive voltage will be attracted to the negative voltage, while the negative charges in the plate connected to the negative voltage will be attracted to the positive voltage.

The movement of charges between the plates is also affected by the presence of any obstacles or resistances in the electric field, such as resistance in the wire. This can slow down the movement of charges and result in a decrease in the current flowing through the circuit.

In all, the movement of charges between electric parallel plates is the result of the electric field created by a difference in electric potential, and the movement of charges is called drift velocity. The movement is also affected by the presence of resistance.

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By dividing an object's charge by its basic charge, one can calculate the quantity of extra electrons (or protons, in the case of positive charges), in a system.

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Explanation:

6) newton

7) f =ma = 15*15 = 225N

8) a= 100/20 = 5ms^-2

Answer:

6 newton

7) f =ma = 15*15 = 225N

8) a= 100/20 = 5ms^-2

Explanation:

this is right pls mark as brainliest

Answer:

a

Explanation:

A conversion factor is a ratio that can be used to convert a quantity expressed in one unit of measurement to another unit of measurement.

What is conversion factor?

For example, the conversion factor between meters and feet is given by:

1 meter = 3.281 feet

This means that to convert a quantity expressed in meters to feet, multiply by 3.281. To convert a quantity expressed in feet to meters divide by 3.281.

To convert 1.00 mile to kilometres, the conversion factor is used 1 km = 0.621 miles.

To convert 1.00 km to feet, the conversion factor of 1 km = 3.281 ft

Calculation of the above statement:

This question asks to use the given definition (1 inch = 2.54 cm) to convert the units of measurement of miles and feet to kilometers.

(a) To convert 1.00 mile to kilometres, the conversion factor is used 1 km = 0.621 miles. So, to convert 1.00 mile to kilometers,  multiply 1.00 by 0.621:

So, 1.00 mile is equivalent to 0.621 kilometers.

(b) To convert 1.00 km to feet, use the conversion factor of 1 km = 3.281 ft. So, to convert 1.00 km to feet, multiply 1.00 by 3.281:

So, 1.00 km is equivalent to 3.281 feet.

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During an earthquake, it is important to take appropriate steps to ensure safety

(i) When you are in the classroom

Drop, Cover, and Hold On: Quickly drop to the ground, take cover under a sturdy desk or table, and hold on to it to protect yourself from falling objects and potential structural collapse.

Protect Your Head: If possible, use your arms to cover your head and neck to provide additional protection.

Stay Indoors: Remain inside the classroom until the shaking stops and it is safe to exit. Be prepared for aftershocks, which are smaller tremors that may occur after the main earthquake.

(ii) When you are out of danger:

Evacuate to Open Space: If you are no longer in immediate danger, move quickly to an open space away from buildings, trees, streetlights, and utility wires that may pose a risk of falling or collapsing.

Watch for Falling Debris: Be aware of your surroundings and watch out for any hazards such as falling debris, broken glass, or damaged infrastructure.

Stay Clear of Buildings: Avoid entering damaged buildings or structures as they may be unstable. Keep a safe distance until authorities confirm it is safe to enter.

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We push a car to the distance of 33.939m if we do 28000J work , exerting a force of 825N.

F = applied force

S = distance moved

=28000J/825N

=33.939meter

Thus, we can conclude that the distance moved by the car is 33.939m.

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The height of the luggage with work done of 100J with a mass of 10.5 kg is 0.97m.

Work done equals the product of force and displacement. The energy that gets transferred by the force to move a object is called work done. Work done is equal to the potential energy of the object.

Work done = potential energy

                   = m×g×h

m is the mass of the luggage = 10.5 kg

g is the acc. due to gravity = 9.8 m/s

W is the work done = 100J

h (height) = W / (m×g)

               = 100 / ( 10.5×9.8)

              = 0.97 m

Thus, the luggage rises above the ground with a height of 0.97 m.

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Answer:

neon and argon

Explanation:

because they are inert gas