Danny lowers the sails on his boat. He paddles upstream at 19 km/hr. The current is still running downstream at 15 km/hr. What is the actual velocity of the boat?

Answer:2.25atm , because doubling the number of moles of Ar doubles its partial pressure.

Explanation:

The function should be matched to the correct part of the neuron as follows:

A neuron can be defined as a nerve cell that's saddled with the responsibility of transmitting electrical signal (impulses) down an axon across a cellular membrane of the body of a living organism through an action potential.

In Science, the neuron comprises different parts and these include the following:

In conclusion, we can reasonably infer and logically deduce that a neuron transmits electrical signal (impulses) down an axon (a long, tail-like structure) across a cellular membrane of the body of a living organism to another neuron, usually through a process referred to as an action potential.

Read more on neurons here: brainly.com/question/13076783

#SPJ1

Answer:

Moving-iron instruments are generally used to measure alternating voltages and currents.

Explanation:

In moving-iron instruments the movable system consists of one or more pieces of specially-shaped soft iron, which are so pivoted as to be acted upon by the magnetic field produced by the current in coil.

Answer:

Below

Explanation:

Find acceleration first

vf = vo + at     (starts from rest so vo = 0)

8 = 0 + at    

8 = at

d = vo t + 1/2 a t^2     (substitute 8 in for 'at')

200 = 0 t  + 1/2 (8) t

200 / 4 = t = 50 seconds for front of train to pass her at 8 m/s

  acceleration = change in velocity / change in time = 8 / 50 = .16 m/s^2

Back of train has to travel 120 meters at initial v = 8 m/s  and accelerating  at .16 m/s^2   :

  d = vo t + 1/2 a t^2

 120 = 8 t + 1/2 ( .16 ) t^2

           .16t^2 + 8t - 120 = 0      Quadratic Formula shows t = 13.25 s

vf = vo  + a t

vf = 8 m/s  + .16 m/s^2 ( 13.25 s) = 10.1 m/s

Answer:

Option D. 9.47 V

Explanation:

We'll begin by calculating the equivalent resistance of the circuit. This can be obtained as follow:

Resistor 1 (R₁) = 20 Ω

Resistor 2 (R₂) = 30 Ω

Resistor 3 (R₃) = 45 Ω

Equivalent Resistance (R) =?

R = R₁ + R₂ + R₃ (series connections)

R = 20 + 30 + 45

R = 95 Ω

Next, we shall determine the current in the circuit. This can be obtained as follow:

Voltage (V) = 45 V

Equivalent Resistance (R) = 95 Ω

Current (I) =?

V = IR

45 = I × 95

Divide both side by 95

I = 45 / 95

I = 0.4737 A

Finally, we shall determine, the voltage across R₁. This can be obtained as follow:

NOTE: Since the resistors are in series connection, the same current will pass through them.

Current (I) = 0.4737 A

Resistor 1 (R₁) = 20 Ω

Voltage 1 (V₁) =?

V₁ = IR₁

V₁ = 0.4737 × 20

V₁ = 9.47 V

Therefore, the voltage across R₁ is 9.47 V.

Answer:

9.47

Explanation:

Just Took the Test

Answer:

B The most basic atoms were formed due to the force of gravity.

Explanation:

Since the statement says that the atoms could have faced the peril of disintegrating into the void, this means that, they could have been destroyed by movement away into the void.

But, it also says that by now, they are feeling the influence of gravity to bring them safely together. This statement shows that gravity brings them (the atoms) together and thus doesn't allow them disintegrate into the void.

So, a reader can thus infer that the most basic atoms were formed due to the force of gravity since it doesn't allow the atoms disintegrate into the void.

So, B is the answer.

The net force on particle q2 can be calculated by finding the net electric force acting on it. The net electric force acting on a particle is the vector sum of the forces exerted by all the other charges on it.

The electric force between two charges q1 and q2 is given by Coulomb's law: F = k * (q1 * q2)/r^2, where k is Coulomb's constant, q1 and q2 are the charges, and r is the distance between them.

The force on particle q2 due to q1 will be:

F1 = k * (q1 * q2) / (0.980m)^2

The force on particle q2 due to q3 will be:

F2 = k * (q2 * q3) / (0.750m)^2

The net force acting on q2 will be the vector sum of F1 and F2.

Keep in mind, q1 and q3 have opposite charges, so they attract each other, while q2 has the same charge as q1, so they repel each other.

Note: The unit of charge is Coulomb (C), but in this problem you are given the charges in microCoulomb (uC) so you need to convert it to Coulomb.

Answer:

You need to plug in the values

(C) 100(-1/2)^0 = 100

100(-1/2) = -50

100(-1/2)^2 = -25

100(-1/2)^3 = 100 * -1/8 = -12.5

Answer:

 v_f = 1.14 m / s

Explanation:

This is an exercise of conservation of momentum, let's define a system formed by the skater and the snowball, therefore the forces during the launch are internal and the moment is conserved.

Initial instant. Before throwing the ball

        p₀ = M v₀

Final moment. After throwing the snowball

       p_f = (M-m) v_f + m v

the moment is preserved

        p₀ = p_f

        M v₀ = (M-m) v_f + m v

        v_f = \(\frac{M v_o - m v}{M-m}\)

let's calculate

       v_f = \(\frac{57 \ 1.2 - 0.11 \ 31.5}{ 57 - 0.11}\)

       v_f = 64.936 / 56.89

       v_f = 1.14 m / s

Answer:

No.

Explanation:

No, increasing the frequency of a wave will not increase it's wavelength. Rather it will decrease the wavelength because frequency and wavelength are inversely related.

According to Formula:

v = f(lemda)

If the speed is kept constant to find the relationship between f and wavelength.

=> f is inversely propotional to wavelength.

Hope this helps!

Have a great day!

Explanation:

A theory is a way of explaining an object or event using a set of facts.

Answer:

The electricity produced from the main source which is an electrical generator which is usually close a remote abundant source of natural energy or at a distant location away from the residential areas where the electricity is used

The step up transformer is  the device used to raise the voltage and therefore lower the current of the of incoming generated electricity before it is transmitted through high tension cables so that the energy loss from source to destination is reduced and the electricity generated can applied where needed

However, the high voltage transmitted along power lines to reduce energy loss cannot be used as it is by the consumer, partly because it is very harmful in the event of an electric shock and can easily damage household electrical devices, therefore, the high voltage in the power lines is reversed back or lowered into voltages which can be used to power electrical devices in buildings with the use of a step-down transformer

Explanation:

When an object is placed farther from a convex mirror than the focal length, the image is smaller and virtual.

The image produced by a convex mirror is always virtual, and located behind the mirror. When the object is far away from the mirror the image is upright and located at the focal point. As the object approaches the mirror the image also approaches the mirror and grows until its height equals that of the object. A convex mirror always creates a virtual image which is diminished. So, magnification produced by convex mirror is always less than one. So, When an object is placed farther from a convex mirror than the focal length, the image is smaller and virtual.

Learn more about Convex Mirror

brainly.com/question/11627506

#SPJ4

Answer:

classifying: are made by using the 5 senses.  Good observations are essential in learning the other science process skills.

Examples:

The learner will be blind folded and make observations using the sense of touch.  

The learner will create  observations about a coin using the 5 senses.

The learner will mix primary colors to create more colors.

answer

2. Classifying: making observations is important to notice similarities, differences with the garden vegetables

inferring: use your information that u already know

measuring:The learner will find the mass of different liquids that have the same volume

communication:It is important to be able to share your information.  This can be done with graphs, diagrams, maps, and spoken word

Explanation:

can u mark as brainliest pls

Answer:

The radius will be "100.31 m". A further solving is given below.

Explanation:

The given values are:

Time,

T = 2 minutes

i.e.,

 = 120 seconds

Speed,

V = 5.25 m/s

As we know

⇒  \(T=\frac{2 \pi R}{V}\)

then,

⇒  \(R=\frac{TV}{2 \pi}\)

On substituting the given values, we get

⇒      \(=\frac{120\times 5.25}{2\times 3.14}\)

⇒      \(=\frac{630}{6.28}\)

⇒      \(=100.31 \ m\)

Gravitational force between two masses m, and m, is represented as F = Gm₂ m₂ / r^2 where r = xi+yj + zkG, m, m₂ are nonzero constants and let's assume that I = 0

a) Calculation:For F = Gm₂ m₂ / r^2.

Using r = xi+yj + zk and let r^2 = x^2 + y^2 + z^2∴ F = Gm₂ m₂ / (x^2 + y^2 + z^2), Where G, m, m₂ are nonzero constants. Divergence of F = ∇ · F= 1/r^2(d/dx(r^2Fx) + d/dy(r^2Fy) + d/dz(r^2Fz))= 1/r^2(d/dx(r^2Gm₂ m₂ x/(x^2+y^2+z^2)^(3/2)) + d/dy(r^2Gm₂ m₂ y/(x^2+y^2+z^2)^(3/2)) + d/dz(r^2Gm₂ m₂ z/(x^2+y^2+z^2)^(3/2)))= 1/r^2(d/dx(r^2Gm₂ m₂ x/(x^2+y^2+z^2)) * (x^2+y^2+z^2)^(3/2) + d/dy(r^2Gm₂ m₂ y/(x^2+y^2+z^2)) * (x^2+y^2+z^2)^(3/2) + d/dz(r^2Gm₂ m₂ z/(x^2+y^2+z^2)) * (x^2+y^2+z^2)^(3/2))= 1/r^2(Gm₂ m₂ [2x(x^2+y^2+z^2)-3x^2]/(x^2+y^2+z^2)^(5/2) + Gm₂ m₂ [2y(x^2+y^2+z^2)-3y^2]/(x^2+y^2+z^2)^(5/2) + Gm₂ m₂ [2z(x^2+y^2+z^2)-3z^2]/(x^2+y^2+z^2)^(5/2))= 1/r^2(Gm₂ m₂ [(2x^2+2y^2+2z^2-3x^2)/(x^2+y^2+z^2)^(3/2)] + [2x^2+2y^2+2z^2-3y^2]/(x^2+y^2+z^2)^(3/2)] + [2x^2+2y^2+2z^2-3z^2]/(x^2+y^2+z^2)^(3/2)])= 1/r^2(Gm₂ m₂ [x^2+y^2+z^2]/(x^2+y^2+z^2)^(3/2))= 0.

Curl of F = ∇ × F= i(d/dy(Fz) - d/dz(Fy)) - j(d/dx(Fz) - d/dz(Fx)) + k(d/dx(Fy) - d/dy(Fx))= i(d/dy(Gm₂ m₂ z/(x^2+y^2+z^2)) - d/dz(Gm₂ m₂ y/(x^2+y^2+z^2))) - j(d/dx(Gm₂ m₂ z/(x^2+y^2+z^2)) - d/dz(Gm₂ m₂ x/(x^2+y^2+z^2))) + k(d/dx(Gm₂ m₂ y/(x^2+y^2+z^2)) - d/dy(Gm₂ m₂ x/(x^2+y^2+z^2)))= i(Gm₂ m₂ [-2xz]/(x^2+y^2+z^2)^(5/2)) - j(Gm₂ m₂ [-2yz]/(x^2+y^2+z^2)^(5/2)) + k(Gm₂ m₂ [(x^2+y^2-2z^2)]/(x^2+y^2+z^2)^(5/2))

b) Calculation:The line integral of F along a curve C can be evaluated by the following formula∫C F.dr = ∫∫ ( ∇ x F) ds, Where r is the position vector of the curve, s is the scalar parameter representing the curve, and the integral is evaluated from the initial point to the final point.

Using the curl of F obtained in part a) and for the surface with ∂S as C∫C F.dr = ∫∫ ( ∇ x F) ds= ∫∫ curl(F) ds= ∫∫ (-2xz i -2yz j + (x^2+y^2-2z^2)k) ds...[1]

Let's consider the surface S as a plane perpendicular to the z-axis of the form ax+by+c=0 and the curve C as the intersection of the plane and the cylinder x^2 + y^2 = a^2.

Let's choose the unit normal to the surface S as k (along the z-axis).

The curl of F is a vector field perpendicular to the plane and along the direction of k.

Thus the integral can be written as∫C F.dr = ∫∫ ( ∇ x F) . k ds= ∫∫ (x^2+y^2-2z^2) ds...[2]

Now let's evaluate the integral over the given plane ax+by+c=0. We can write x = t, y = (c-at)/b and z = 0, where t is the scalar parameter along the line of intersection of the plane and the cylinder (x^2 + y^2 = a^2).

Since the curve C is on the cylinder of radius a, we have x^2+y^2 = a^2 ⇒ t^2+(c-at)^2/b^2 = a^2On solving for t, we have t = (bc±ab √(a^2-b^2-c^2))/[a^2+b^2].

Substituting t in x and y, we get the curve C in the x-y plane as a function of the scalar parameter s asx = (bc±ab √(a^2-b^2-c^2))/[a^2+b^2]y = (c-at)/b= (c-(bc±ab √(a^2-b^2-c^2))/[a^2+b^2])/b.

Now we can evaluate the integral over the curve C, which is along the intersection of the plane and the cylinder.

Integral over C (x^2+y^2-2z^2) ds= ∫t₁^t₂ [(t^2 + [(c-at)^2]/b^2 - 2(0)^2)^(1/2)] dt= ∫t₁^t₂ [(a^2-b^2-c^2)t^2+2bc(c-at)+b^2c^2-a^2b^2]^(1/2) dt.

Now we can choose the value of t₁ and t₂ such that the square root in the integrand is minimized (so that the integral is path-independent).

This can be done by choosing the value of t that gives the minimum value of (a^2-b^2-c^2)t^2+2bc(c-at)+b^2c^2-a^2b^2 over the range of t from t₁ to t₂.

On differentiation with respect to t and equating to 0, we get the value of t = bc/(a^2+b^2).

Substituting this value of t in the integrand, we get the minimum value of the square root in the integrand to be |c| √(a^2+b^2)/|b|.

Thus the integral over C is given by∫C F.dr = ∫∫ (-2xz i -2yz j + (x^2+y^2-2z^2)k) ds= ∫∫ (x^2+y^2-2z^2) ds= ∫t₁^t₂ |c| √(a^2+b^2)/|b| dt= |c| √(a^2+b^2)/|b| (t₂-t₁).

Now we can see that the integral is path-independent as it depends only on the end points t₁ and t₂ and not on the path taken to reach them.

Learn more about position vector here ;

https://brainly.com/question/14552074

#SPJ11

The diffusivity of a gas in another gas is a measure of the rate at which the two gases mix. At room temperature (25℃), the diffusivity of a gas in another gas can be increased by a factor of 10 by raising the temperature.

The diffusivity of a gas in another gas is proportional to the square root of the temperature. This relationship is known as Graham's law of effusion. Graham's law states that the rate of effusion of a gas is inversely proportional to the square root of its molecular weight. This can be extrapolated to diffusivity by assuming that the molecular weight of the two gases is similar, and that the effusion rate is proportional to the diffusivity.

Therefore, to increase the diffusivity of a gas in another gas by a factor of 10, the temperature must be increased by a factor of 10^2 = 100. This would require a temperature increase of 100 * 25℃ = 2500℃.

It is important to note that this calculation assumes that the gases are dilute and ideal, meaning that they obey the ideal gas law and do not interact with each other. In real-world situations, the diffusivity of a gas in another gas can be affected by factors such as pressure, molecular weight, and intermolecular interactions.

Here you can learn more about the diffusivity of a gas

https://brainly.com/question/23804077#

#SPJ11

Answer:

a) 16m/s b) 192m

Explanation:

v1=32m/s a=-2m/s^2 t=8s v2=? d=??

a) I will use this equation v2= v1 + a*t

v2= 32m/s + -2m/s^2 * 8s

v2= 32m/s + -16m/s

v2= 16m/s

b) v2^2=v1^2 + 2ad

rearranging

v2^2-v1^2=2ad

v2^2-v1^2/2= a d

v2^2-v1^2/2a=d

16m/s^2 - 32m/s^2/ 2 x-2m/s^2 =d

d=192m

The given statement "gases diffuse because of differences in partial pressures from areas of higher pressure to areas of lower pressure." is True because in areas with higher pressure, the gas molecules are more densely packed and push against each other, creating pressure. In areas with lower pressure, the molecules have more room to move around, leading to diffusion.

This pressure is then transferred to other areas with lower pressure, causing the molecules to move and spread out. This is known as the principle of diffusion, and it explains why gases diffuse from areas of higher to lower pressure. When two areas of gas with different pressures come in contact, the molecules will mix until both areas have the same partial pressure. Diffusion is an important process that helps to maintain equilibrium in nature.

It is responsible for the circulation of air, the spread of pollutants in the environment, and the distribution of temperature in a closed environment. The principle of diffusion is also used in industrial processes such as the production of chemicals and foods. Overall, diffusion is an important process that is responsible for the mixing and circulation of gases in the atmosphere. It is caused by differences in partial pressure between areas of higher and lower pressure, and it helps to maintain equilibrium in nature.

Know more about partial pressures here:
https://brainly.com/question/29428016

#SPJ11

When the circuit is closed, the direction of the force exerted on the wire by the magnet is to the left.

A magnet placed near a wire creates a magnetic field. A wire carrying a current produces a magnetic field around it. These two fields interact, resulting in a force on the wire that is perpendicular to both the magnetic field of the magnet and the current in the wire. When the circuit is closed, a current is flowing through the wire. The current direction is shown in the picture below.

When a current-carrying wire is placed in a magnetic field, a force is exerted on the wire. The force is perpendicular to both the direction of the magnetic field and the direction of the current in the wire. The force is proportional to the strength of the magnetic field, the current in the wire, and the length of the wire within the magnetic field.

When the current flows, a magnetic field is produced around the wire that points upwards, as shown by the green arrows. When the magnetic field of the magnet is also taken into account, the direction of the force exerted on the wire is to the left, as shown by the blue arrow. Therefore, the answer is that when the circuit is closed, the direction of the force exerted on the wire by the magnet is to the left.

To know more about magnetic fields:

https://brainly.com/question/11514007

#SPJ11

The horizontal velocity of giraffes as they leave the conveyor belt is 1.1 m/s.

It takes t seconds the giraffes to reach the bottom of the belt.

We know that \(t=\sqrt{-2y/g}\) where, y= horizontal distance

Here y=0.6 m

So \(t=\sqrt{(-2)(-0.6)/9.8}\) = 0.35 sec

Now the velocity of the giraffes must be:

\(V_{x} = x/t\) = 0.4/0.35 = 1.1 m/s

So the velocity of giraffes as they leave the conveyor belt is 1.1 m/s.

To more about velocity visit:

https://brainly.com/question/28658398

#SPJ1

The shockwaves of released energy that radiate through Earth during an earthquake are classified as seismic waves.

An area of extremely high pressure traveling through the air, earth, or water is referred to as a shock wave. It is brought on by an earthquake, an explosion, or a fast-moving object.

Seismic waves are produced when components of the Earth move suddenly, such as when a fault slips during an earthquake. Volcanic eruptions, explosions, landslides, avalanches, and even running rivers can result in seismic waves.

When materials suddenly move within the Earth, such as when they slip along a fault during an earthquake, seismic waves are produced. Seismic waves can also be produced by volcanic eruptions, explosions, landslides, avalanches, and even swiftly flowing rivers.

Therefore, Seismic waves are the shockwaves of released energy that go through the Earth during an earthquake.

Learn more about shockwaves here:

https://brainly.com/question/10047220

#SPJ1

When the area of each plate is doubled while keeping the charge and separation constant, the electric field decreases, the potential difference remains the same, and the stored energy in the capacitor increases four times.

When the area of each plate of a capacitor is doubled while keeping the total charge on each plate and the separation between the plates constant, the following changes occur:

1. Electric Field: The electric field between the plates decreases. The electric field (E) between the plates of a capacitor is inversely proportional to the area (A) of the plates. As the area is doubled, the electric field is halved, assuming the other factors remain constant.

2. Potential Difference: The potential difference (V) across the plates remains the same. The potential difference across the plates of a capacitor depends on the charge (Q) and the capacitance (C), which is determined by the geometric and material properties of the capacitor. Since the total charge and separation between the plates are held constant, the potential difference remains unchanged.

3. Stored Energy: The stored energy in the capacitor increases four times. The energy stored in a capacitor (U) is directly proportional to the area of the plates (A). When the area is doubled, the stored energy is quadrupled (increases by a factor of four).

Therefore, when the area of each plate is doubled while keeping the charge and separation constant, the electric field decreases, the potential difference remains the same, and the stored energy in the capacitor increases four times.

Learn more about capacitors and their properties here:

brainly.com/question/30547869

#SPJ11

Any substance that possesses mass and volume is considered to be matter. In general, atoms and anything composed of them are considered to be "matter."

Energy is the power to effect change or carry out work.

The connection between energy and matter is determined by the speed of light, per the theory of relativity. E = M x C^2, where E is energy, M is mass, and C is the speed of light, describes how matter and energy are related.

Matter and Energy - How are they inter-related?

The variation in a body's mass is inversely proportional to the square of the speed of light and directly correlated with the amount of energy released during the conversion process. An energy conversion process can be carried out by a system using this kind of transformations, in which some of the body's intrinsic energy is converted into thermal energy or radiant light. Also implied by this process is a loss of mass. At the atomic level, the shift of mass is significant because it demonstrates that matter is not an immutable property of the body and that it may, in fact, "disappear," releasing energy to the outside.

To know further information about Matter and Energy, click on the link below:

https://brainly.com/question/638477

#SPJ9

The curvature of a lens is the main factor that increases the amount of light that bends as it passes through.

Specifically, a lens with a greater curvature, either convex or concave, will cause light rays to bend more significantly.

When light enters a lens, it encounters a change in the refractive index between the surrounding medium (such as air) and the lens material.

This change in refractive index causes the light rays to change direction, or bend, as they pass through the lens. The degree of bending depends on the curvature of the lens surface.

A convex lens, which is thicker in the middle and thinner at the edges, converges light rays towards a central point called the focal point.

This type of lens has a positive curvature, and it increases the bending of light. As a result, parallel light rays converge and come together at the focal point.

On the other hand, a concave lens, which is thinner in the middle and thicker at the edges, diverges light rays.

It has a negative curvature and spreads out the light. This type of lens decreases the amount of bending compared to a flat surface.

In summary, the curvature of a lens determines the extent to which light rays bend, with a greater curvature leading to increased bending.

To know more about "Refractive index" refer here:

https://brainly.com/question/30761100#

#SPJ11

Answer:

10 / 80 amount of potassium-40 remaining

1/8 = 1/2 * 1/2 * 1/2 = 3 half-lives

3 half-lives * 1.3E9 yrs / half-life = 3.9E9 yrrs

After 3.9 billion years the 80 g will have decayed to 10 g

Answer:

3.9 billion years

Explanation:

i took test

Answer:

7.35 seconds

Explanation:

The computation of the time passed prior to the ball reached to the highest point is as follows;

As we know that the acceleration because of gravity on earth is 9.8 m/s

As the ball is thrown directly in an upward direction with a speed of 72 m/s

So, the time passed prior to the ball reached to the highest point is

= 72 ÷ 9.8

= 7.35 seconds

Hence, the above represents the answer