What does 2 charge mean in chemistry?

Answer: To focus on a near object – the lens becomes thicker, this allows the light rays to refract (bend) more strongly. To focus on a distant object – the lens is pulled thin, this allows the light rays to refract slightly.

Explanation:

Answer:

1.5x10^-4C

C=Couloumb's

Explanation:

Expression for the electric force between the two charges is given by -

F = (k*q1*q2) / r^2

Here, k = constant = 9 x 10^9 N*m^2 / C^2

F=25N

q1 = 1.9x10^-6 x 10^-6 C

q2 = ?

r = 0.32m

Substitute the given values in the above expression -

25N= 9x10^9 *1.9x10^-6 *q2 / 0.32m^2

25N= 17,100*q2 / 0.1024m

Next part is algebra     multiply both sides by 0.1024 to remove denominator

2.56=17,100*q2  

Divide both sides to isolate q2

q2= 1.5x10^-4C

Answer:

True

Explanation:

Answer: The correct answer is 912 A

Assuming that air resistance is negligible, we can use the equations of motion to compare the time it takes James and John to reach the lake.

For James, who simply drops straight down from the edge, the only force acting on him is gravity. The distance he falls is the same as the height of the rock outcropping. We can use the following equation to find the time it takes for him to fall:

h = 1/2 * g * t²

where h is the height of the rock outcropping, g is the acceleration due to gravity (approximately 9.81 m/s²), and t is the time it takes for James to fall.

Solving for t, we get:

t = sqrt(2h/g)

For John, who takes a running start and jumps with an initial horizontal velocity of 5 m/s, he will have both horizontal and vertical motion. The horizontal motion will not affect the time it takes for him to reach the lake, but the vertical motion will. We can use the following equations to find the time it takes for John to reach the lake:

y = v0y * t + 1/2 * g * t²

x = v0x * t

where y is the height of John above the lake, x is the horizontal distance John travels, v0y is the initial vertical velocity (which is 0 for John), v0x is the initial horizontal velocity (which is 5 m/s for John), and t is the time it takes for John to reach the lake.

Solving the first equation for t, we get:

t = sqrt(2y/g)

Substituting this into the second equation, we get:

x = v0x * sqrt(2y/g)

Since the height y is the same as the height of the rock outcropping h, we can set the two expressions for t equal to each other and solve for x:

sqrt(2h/g) = sqrt(2y/g)

2h/g = 2y/g

y = h/2

Substituting this into the expression for x, we get:

x = v0x * sqrt(h/g)

Plugging in the values, we get:

t(James) = sqrt(2h/g) = sqrt(2 * 10 / 9.81) ≈ 1.43 s

t(John) = sqrt(2h/g) = sqrt(2 * 5 / 9.81) ≈ 1.01 s

Therefore, it takes James about 1.43 seconds to reach the lake, while it takes John about 1.01 seconds to reach the lake.

learn more about horizontal velocity here:

https://brainly.com/question/30559316?utm_source=android&utm_medium=share&utm_campaign=question

#SPJ11

The amount of heat that needs to be removed from surface A per unit area to maintain its constant temperature is 4639.80 W/m².

Part A Reynolds Number:

The given terms are,

Length, L = 6 m

Speed, V = 100 km/h

= (100 x 1000) / (60 x 60)

= 27.78 m/s

Density, p = 1.2 kg/m³

Viscosity, μ = 1.8 x 10-5 kg/ms

Reynolds Number,

\(Re = (pVL) / μ\)

= (1.2 x 27.78 x 6) / (1.8 x 10^-5)= 2.00 x 10^7

If Reynolds number is greater than 4000, the flow is turbulent.

As Reynolds number = 2 x 10^7, the flow is turbulent.

Part B. The given terms are, Emissivity, e = 0.97

View factor, F12 = 1

Temperature, T1 = 200°C

Temperature, T2 = 800°C

Stefan Boltzmann constant, σ = 5.67 x 10^-8 W/m².K^4

The amount of heat that needs to be removed from surface A per unit area to maintain its constant temperature is calculated as follows,

\(Q = F12 e σ (T14 - T24)\)

= (1 x 0.97 x 5.67 x 10^-8) (200 + 273)^4 - (800 + 273)^4)

= 4639.80 W/m²

Therefore, the amount of heat that needs to be removed from surface A per unit area to maintain its constant temperature is 4639.80 W/m².

To know more about heat visit-

https://brainly.com/question/30603212

#SPJ11

In order to find the magnitude of the electric field at the origin, you need to use the equation E = q/4πεr², where q is the charge, ε is the permittivity of space, and r is the distance from the origin.

To calculate the electric field, you must first determine the charge of the particle, then determine the distance to the origin, and finally, use the equation to calculate the magnitude of the electric field.

Once you have the magnitude of the electric field at the origin, you can then use it to explore the behavior of other electric fields in the area.

To calculate the magnitude, you must first determine the values of k, q, and r, then plug them into the equation and solve. The resulting answer will be the magnitude of the electric field at the origin.

To learn more about magnitude, click here:

https://brainly.com/question/15681399

#SPJ4

Answer:

S. offspring recieve a mix of genes from two different parents

Offspring acquire genes that are exactly the same as one parent’s genes. Option B is correct.

Given that,
To choose the statement best explains the genetic variation that results from sexual reproduction.

Sexual reproduction is the process of creating new organisms by combining the genetic details of two individuals of different genders. The genetic details in most animals is carried on chromosomes in the nucleus of reproductive cells called gametes, which unite to form a diploid zygote.

Here,
The solution is due to the fact that each parent has two distinct sets of genes. Furthermore, each parent only passes on half of their DNA to their offspring. And that the half that is passed on is arbitrary. All of this ensures that each child is born with a distinct set of genes.

Thus, Offspring acquire genes that are exactly the same as one parent’s genes. Option B is correct.

Learn more about sexual reproduction here:
https://brainly.com/question/7464705
#SPJ2

In Thomson's experiment, when electrons enter a region of uniform magnetic field with strength B and length L, they experience a deflection through an angle θ ≈ (eBL)/(m), assuming small angles. This deflection angle is determined by the charge of the electron (e), the magnetic field strength (B), the length of the magnetic field region (L), and the mass of the electron (m).

When electrons enter a region with a uniform magnetic field, they experience a force known as the Lorentz force, given by F = q(v x B), where q is the charge of the particle, v is its velocity, and B is the magnetic field vector.

In Thomson's experiment, the electric field is turned off, so the electrons only experience the magnetic force. The force causes the electrons to move in a circular path due to the magnetic field acting as a centripetal force.

The deflection angle can be determined by considering the circular motion of the electrons. The centripetal force is provided by the magnetic force, so we can equate these forces: q(v²/r) = qvB, where r is the radius of the circular path.

Since the electrons are deflected through a small angle, we can approximate sin(θ) ≈ θ for small angles. Therefore, we can rewrite the equation as: qvB = mv²/r. From here, we can solve for the deflection angle θ by considering the radius of the circular path, which is related to the length of the magnetic field region: r = L.

Rearranging the equation, we have: θ = (qvBL)/(mv²). Since the mass of an electron is very small compared to its charge, we can approximate mv² as 2E, where E is the kinetic energy of the electron. Substituting this approximation, we get θ ≈ (eBL)/(2E). Since E = mv²/2, we can further simplify it to θ ≈ (eBL)/(2mv²), which can be written as θ ≈ (eBL)/(m).

Therefore, for small angles, the electrons in Thomson's experiment are deflected through an angle θ ≈ (eBL)/(m), where e is the charge of the electron, B is the magnetic field strength, L is the length of the magnetic field region, and m is the mass of the electron.

To learn more about  electrons click here: brainly.com/question/860094

#SPJ11

Answer:

1.2 m/s^2

Explanation:

average acceleration = vf-vi/t = (15 m/s-0 m/s)/10 s = 1.2 m/s^2

An ideal current source as an electronic device that provides a constant current. We then designed three different current sources: BJT, op-amp, and FET current sources.

An ideal current source is an electronic device that provides a constant and independent current regardless of the load connected to it. It can be considered as an ideal voltage source in series with a resistor. The output resistance of an ideal current source is infinite.
Now, let's design three different current sources and calculate their corresponding output resistances:
1. Bipolar Junction Transistor (BJT) Current Source:
A BJT can be used to create a current source by configuring it in the common-emitter mode. By biasing the base-emitter junction with a constant voltage, a constant collector current can be achieved.
The output resistance of this BJT current source can be calculated using the hybrid-pi model. It is given by the formula: \(r_out = (1 + β) * (VT / Ic),\)

where β is the current gain of the transistor, VT is the thermal voltage, and Ic is the collector current.
2. Operational Amplifier (Op-Amp) Current Source:
An op-amp can be used to create a current source by connecting a resistor between the inverting input and the output of the op-amp, and providing a reference voltage at the non-inverting input.
The output resistance of this op-amp current source is equal to the resistance connected to the inverting input.
3. Field-Effect Transistor (FET) Current Source:
A FET can be used to create a current source by configuring it in the common-source mode. By biasing the gate-source junction with a constant voltage, a constant drain current can be achieved.
The output resistance of this FET current source can be calculated using the formula:

\(r_out = (1 / gm),\)

where gm is the transconductance of the FET.

In summary, we defined the corresponding output resistances for these sources are given by the formulas mentioned above. These sources can be used in various applications, such as biasing circuits and current mirrors.

To know more about resistor visit:

https://brainly.com/question/30672175

#SPJ11

Answer:

If a star is moving towards the earth, its light is shifted to higher frequencies on the color spectrum (towards the green/blue/violet/ultraviolet/x-ray/gamma-ray end of the spectrum). A higher frequency shift is called a "blue shift".

Explanation:

It just means that the entire spectrum is shifted up in frequency.

The dura mater forms the tough and fibrous outer sac of the meninges. The meninges are the protective layers that surround the brain and spinal cord. The three layers of the meninges are the dura mater, arachnoid mater, and pia mater.

The dura mater is the thickest and outermost layer of the meninges. It is a fibrous membrane that is attached to the skull and the vertebrae of the spine. The dura mater forms a tough, outer sac that surrounds and protects the brain and spinal cord.

The dura mater is composed of two parts: the outer dura mater and the inner dura mater. The outer dura mater is made up of dense connective tissue that is rich in collagen fibers. It is attached to the skull and the vertebrae of the spine, forming a tough, protective barrier around the brain and spinal cord. The inner dura mater is a thinner layer of connective tissue that is rich in blood vessels and lymphatic vessels. It is also known as the arachnoid mater. The inner dura mater is attached to the outer dura mater, forming a space called the subarachnoid space, which contains cerebrospinal fluid (CSF).

Learn more about dura mater Visit: brainly.com/question/16944461

#SPJ4

The acceleration of free fall on the planet is given by 39.2 m/s².

The acceleration of free fall is the acceleration at which a body falling freely experiences the gravitational pull of a single planet. It is also known as a gravitational acceleration.

Value of  the acceleration of free fall on earth is 9.8 m/s².

The formula of acceleration of free fall on any planet is given by:

g₁ = GM/R²

As the extrasolar planet appears to be rockier and denser than earth. it is 16 times as massive as earth, but its diameter is only twice that of earth, the acceleration of free fall on any planet is given by:

g₁ = GM/R² = 16GMe/(2Re)² = 4 GMe/Re = 4g = 4× 9.8 m/s² = 39.2 m/s² .

Learn more about acceleration here:

https://brainly.com/question/12550364

#SPJ1

Answer:

To calculate the linear expansion of a brass rod due to a temperature change of 100K, we can use the formula:

ΔL = α * L * ΔT

where:

α = linear expansivity of brass (1.8 x 10^-5K^-1)

L = original length of the rod (2m)

ΔT = change in temperature (100K)

Plugging in the values:

ΔL = 1.8 x 10^-5K^-1 * 2m * 100K = 0.036m

So the linear expansion of the brass rod due to a temperature change of 100K is 0.036 meters.

A materiel that allows electricity to flow easily is called an conductor

If the universe were completely empty except for one object-a solid sphere moving through space at a speed of 100 km/s, it would take forever to be able to stop the object.

We know that according to the law of inertia, a body will continue in it state of rest unless it is acted upon by an external force. On the basis of this law, we know that if the universe is empty, there would be nor force that would be able to stop any object that is moving on the earth.

Thus, if the universe were completely empty except for one object-a solid sphere moving through space at a speed of 100 km/s, it would take forever to be able to stop the object.

Learn more about the universe:https://brainly.com/question/18128368

#SPJ1

Answer:

Explanation:

.

Answer:

C

Explanation: Study Island

Answer:

The Straight Line Graph

Explanation:

The impulsive torque that the thrusters must impart about the y-axis to cause the satellite to precess at 5 rev/s is 1800π N m.

Since the body-fixed axes are the principal axes of inertia, the moment of inertia tensor can be written as a diagonal matrix:

I = [I_x 0 0; 0 I_y 0; 0 0 I_z]

where I_x, I_y, and I_z are the moments of inertia about the x, y, and z axes, respectively.

The angular momentum vector is given by:

L = I * w

where w is the angular velocity vector, which is [0 0 2π] in this case (since the satellite is spinning at 1 rev/s about the z-axis).

The precession of the satellite is due to a torque applied about the y-axis. The torque vector is given by:

τ = ΔL / Δt

where ΔL is the change in angular momentum and Δt is the time interval over which the torque is applied.

Since we want the satellite to precess at 5 rev/s, the change in angular velocity is:

Δw = [0 5*2π 0] - [0 0 2π] = [0 8π 0]

Using the formula for the change in angular momentum, we have:

ΔL = I * Δw

ΔL = [0 I_y*8π 0]

The time interval over which the torque is applied is not given, so we will assume it is small enough that we can treat the torque as an impulsive torque. The magnitude of the torque is given by:

|τ| = |ΔL / Δt| = |ΔL|

Taking the y-component of the torque vector, we have:

τ_y = I_y*8π

Substituting the given value for the moment of inertia about the y-axis, we get:

τ_y = 300*(3^2)/12 * 8π = 1800π N m

To know more about axes of inertia refer here

https://brainly.com/question/29674841#

#SPJ11

Explanation:

mass=5 kg

potential energy=6000j

height=?

Now

potential energy =m.g.h

or 6000=5*9.8*h

or 6000=49h

or 6000÷49=h

or h= 122.45m

In conclusion, using the equation for vertical displacement, we find that the player will attain a height of approximately 5.3045 meters when achieving a hang time of 1.03 seconds while dunking the ball.

To find the vertical height the basketball player will attain, we can use the equation for vertical displacement:
Δy = v₀t + 0.5gt²
where:
Δy is the vertical displacement (height),
v₀ is the initial vertical velocity (0 m/s since the player starts from rest),
t is the time of flight (1.03 s), and
g is the acceleration due to gravity (9.8 m/s²).
Plugging in the values, we get:
Δy = 0(1.03) + 0.5(9.8)(1.03)²
Simplifying the equation, we find:
Δy = 0 + 0.5(9.8)(1.0609)
Δy = 0 + 5(1.0609)
Δy = 5.3045
Therefore, the basketball player will attain a vertical height of approximately 5.3045 meters.
In conclusion, using the equation for vertical displacement, we find that the player will attain a height of approximately 5.3045 meters when achieving a hang time of 1.03 seconds while dunking the ball.

To know more about vertical displacement visit:

https://brainly.com/question/31650158

#SPJ11

Because ultraviolet light may be absorbed by the filler substance, but not by the lamp's light. Because UV light extracts energy from the filler substance while lamp light does not.

Ultraviolet Rays in the electromagnetic Spectrum Ultraviolet rays are a kind of electromagnetic radiation that extends from the visible light spectrum to the X-ray area.

Harmful rays have a long-term effect on humans, causing skin and eye problems. It is also a source of Vitamin C.

Because ultraviolet light may be absorbed by the filler substance, but not by the lamp's light. Because UV light extracts energy from the filler substance while lamp light does not,

Hence light from the ultraviolet flashlight harden the filling when light from the lamp does not.

To learn more about the ultravoilet ray refer to thr link;

https://brainly.com/question/25780677

The acceleration of the cart at this instant is calculated to be 5.17 m/s² to the right.

Newton's second law explains that acceleration of any object is directly related to net force and inversely related to the mass.

To determine the acceleration of the cart, we need to calculate the net force acting on it.

The net force is the vector sum of the two forces:

Net force = Force a + Force b = 77 N to the right - 15 N to the left = 62 N to the right

Using Newton's second law, F = ma, where F is the net force and m is the mass of the cart, we can calculate the acceleration:

a = F/m = 62 N / 12 kg = 5.17 m/s

Therefore, the acceleration of the cart at this instant is 5.17 m/s² to the right.

To know more about Newtons' law, refer

https://brainly.com/question/28171613

#SPJ1

The velocity of the body at this instant is 65 m/s.

Velocity is a physical quantity that describes the rate at which an object changes its position in a particular direction. It is a vector quantity, which means it has both magnitude and direction. The magnitude of velocity is known as speed and is measured in meters per second (m/s) or other units of distance per unit of time, while the direction of velocity is given by its sign or by specifying its direction in relation to a reference point or axis. Velocity is an important concept in physics, particularly in the study of motion and mechanics.

To find the velocity of the body after 10 seconds, we can use the formula:

v = u + at

where:

v = final velocity

u = initial velocity

a = acceleration

t = time

Plugging in the given values, we get:

v = 5 m/s + (6 m/s^2)(10 s) = 65 m/s

Therefore, At this point, the body's velocity is 65 m/s.

To learn more about Equations of motion click:

https://brainly.com/question/29278163

#SPJ1

Answer:

1. He feels worse off.

2. His awareness of the grim situation.

Explanation:

Elie Weisel's memoir "Night" is about the persecution of the jews by the Germans during the worst genocide in world history. The events leading up to the Holocaust and the resulting after-effects through his personal experience provides one of the most prominent witness accounts of the crime.

When Weisel states that "lying down wasn't an option", he reveals how congested space was in the cabin. The "lucky ones" were able to breathe in the fresh air from the window, while the rest have to be satisfied with wherever they are. This reveals his realization of the grim situation inside the over-packed cabin, where there is hardly any space to move.

And when he said that they "never ate enough to satisfy our hunger", he presents the realization and understanding of the grim situation in the train's cabin where eating is not a luxury, but a necessity to stay alive. And for that, they know they have to "economize, to save for tomorrow" rather than just stay full once.  

Answer:

1. He feels worse off.

2. His awareness of the grim situation.

Explanation:

The induced emf opposing the current is approximately -3.84 V for the 8.00 A current through a 4.00 mH inductor is switched off in 8.33 ms.

To find the induced emf in the inductor, we can use the formula:
emf = -L * (ΔI/Δt)
where:
emf = induced electromotive force (in volts)
L = inductance of the inductor (in Henrys)
ΔI = change in current (in amperes)
Δt = time taken for the current to change (in seconds)
Given the information in your question:
L = 4.00 mH = 4.00 * \(10^{-3}\) H (converting millihenry to henry)
ΔI = 8.00 A (since the current is switched off, the change is equal to the initial current)
Δt = 8.33 ms = 8.33 * \(10^{-3}\) s (converting milliseconds to seconds)
Now, we can plug these values into the formula:
emf = - (4.00 * \(10^{-3}\) H) * (8.00 A) / (8.33 * \(10^{-3}\) s)
emf = - (32 * 10^-3) / (8.33 * \(10^{-3}\))
emf ≈ -3.84 V
The induced emf opposing the current is approximately -3.84 V. The negative sign indicates that the induced emf opposes the change in current, as expected.

To learn more about electromotive force, refer:-

https://brainly.com/question/13753346

#SPJ11

The EMF induced in the inductor opposing the change in current is approximately 3.84 V.

To find the EMF induced in the inductor, we'll need to use the formula for the induced EMF in an inductor, which is:

EMF = -L × (ΔI / Δt)

Here, EMF is the induced electromotive force, L is the inductance, ΔI is the change in current, and Δt is the time interval during which the current changes.

Given the information in your question, we have:

\(L = 4.00 mH = 0.004 H\) (converting millihenries to henries)
\(ΔI = 8.00 A\) (the current goes from 8 A to 0 A)
\(Δt = 8.33 ms = 0.00833 s\) (converting milliseconds to seconds)

Now, plug the values into the formula:

EMF =\(-0.004 H × (8.00 A / 0.00833 s)\)

EMF = \(-3.8408 V\)

Since we're looking for the magnitude of the induced EMF, we can ignore the negative sign:

EMF = 3.8408 V

to know more about EMF refer here:

https://brainly.com/question/16626131#

#SPJ11