to measure the speed of a current, scientists place a paddle wheel in the stream and observe the rate at which it rotates. if the paddle wheel has radius 0.40 m and rotates at 100 rpm, find the speed of the current in m/s.

Explanation:

can you show me the answer of science

Carla says that can't be true because the dimensions of force are Carla because [tex]$[\overrightarrow{\mathrm{v}}]=\left[\frac{\mathrm{L}}{\mathrm{T}}\right]$[/tex].

The correct option is C.

In physics, a mathematical space's dimension is formally defined as the smallest set of coordinates required to specify any given point. As a result, a line has a dimension of one since a point on it may be specified by a single coordinate, such as the point at 5 on a number line.

The definition of the dimensional formula is the correct statement of the physical quantity in terms of its fundamental unit. Dimensional force is one example. F = [M L T-2] It's because Netwon, or kg*m/s2, is the unit of force.

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The complete question is-

Spike claims that dimensional analysis shows that the_ correct expression for change in velocity,  is , where m is mass, t is time, and f is the magnitude of force. Carla says that can't be true because the dimensions of force are ML/T2. which one, if either, is correct? group of answer choices

A-Spike because [tex]$[\overrightarrow{\mathrm{V}}]=\left[\frac{\mathrm{ML}}{\mathrm{T}}\right]$[/tex]

B- Spike because[tex]$[\overrightarrow{\mathrm{v}}]=\left[\frac{\mathrm{T}^2}{\mathrm{~L}}\right]$[/tex]

C- Carla because [tex]$[\overrightarrow{\mathrm{v}}]=\left[\frac{\mathrm{L}}{\mathrm{T}}\right]$[/tex]

D- Carla because [tex]$[\overrightarrow{\mathrm{v}}]=\left[\frac{\mathrm{L}}{\mathrm{MT}}\right]$[/tex]

E- Spike because the dimension of force are [tex]$[\overrightarrow{\mathrm{F}}]=\left[\frac{\mathrm{T}^2}{\mathrm{ML}}\right]$[/tex]  

The correct answer is option D: index finger and thumb are flattened against the handle

All of the following are true of neutral hand position except the index finger and thumb are flattened against the handle.

When the wrist is straight or lightly bent then it is said to be in a neutral position.

Our neutral hand position refers to the palm of the hand being held in an open and relaxed position.

Similarly, the hand will be in a neutral position if the fingers apply light pressure against the instrument handle.

Another example is if we hold a glass full of water, then we will see that our thumb and forearm are aligned with respect to each other.

In the above-mentioned case, the hand will be in a neutral position.

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The height to which Tarzan swings with a mass 80 kg and a velocity of 12 m / s is 7.2 m

K = 1 / 2 m v²

U = m g h

E = K + U

E = Total mechanical energy

K = Kinetic energy

U = Potential energy

m = Mass

g = Acceleration due to gravity

h = Vertical height

v = Velocity

Since Tarzan swings, it represents half the motion of pendulum. Therefore total mechanical energy is constant.

[tex]E_{i}[/tex] = [tex]E_{f}[/tex]

m = 80 kg

[tex]v_{i}[/tex] = 12 m / s

[tex]v_{f}[/tex] = 0

[tex]h_{i}[/tex] = 0

g = 10 m / s²

According to Law of conservation of Energy,

[tex]K_{i}[/tex] + [tex]U_{i}[/tex] = [tex]K_{f}[/tex] + [tex]U_{f}[/tex]

( 1 / 2 * m * [tex]v_{i}[/tex]² ) + ( m g [tex]h_{i}[/tex] ) = ( 1 / 2 * m * [tex]v_{f}[/tex]² ) + ( m g [tex]h_{f}[/tex] )

( 1 / 2 * 80 * 12² ) + 0 = 0 + ( 80 * 10 * [tex]h_{f}[/tex] )

[tex]h_{f}[/tex] = 5760 / 800

[tex]h_{f}[/tex] = 7.2 m

Therefore, Tarzan will swing to a height of 7.2 m

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Answer:  [tex]w=72N[/tex]

Explanation:

[tex]m=40\ kg\\g=1.8\ m/s^2\\w=mg\\w=40*1.8\\w=72N[/tex]

The coefficient of kinetic friction between the box and the floor is 0.2.

The direction of the kinetic friction force between the box and the floor is the opposite of the velocity, as depicted in the free body diagram on the attached picture.

The second Newton's law of motion:

∑ F = m. a

Let F1 be the person force and f be the kinetic friction force.

Since the box is just about to move, it means a = 0.

F1 - f = 0

f = F1 = 100 Newton

Let N be the normal force and w be the weight of the box.

In the vertical direction:

N - w = 0

N = w = 500 Newton.

It is known that:

f = μ . N

Where:  μ = coefficient of kinetic friction.

Hence,

μ . N = 100

μ  = 100/N = 100/500 = 0.2

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The boat's speed relative to the ground when it is heading east with the current is 18.7 m/s and west against the current is -14.1 m/s.

In the first case,

The velocity of the boat concerning water= 16.4 m/s

The velocity of the water concerning ground= 2.3 m/s

By using the formula of relative velocity:

V(b, g)= V(b, w) + V(w, g)

V(b, g)= 16.4i + 2.3i m/s

V(b, g)= 18.7i m/s

Hence, the magnitude of the velocity of the boat concerning the ground is 18.7 m/s along the current.

In the second case,

The velocity of the boat concerning water is -16.4 m/s

The velocity of the water concerning the ground is 2.3 m/s

By using the formula for relative velocity:

V(b, g)= V(b, w) + V(w, g)

V(b, g)= -16.4i + 2.3i

V(b, g)= -14.1i m/s

Hence, the magnitude of the velocity of the boat concerning the ground is -14.1 m/s against the current.

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If a wave is longitudinal that means that it is travelling in the exact same direction, at the exact same angle as the medium in which it is propagating. You can think of it like a stretched out slinky. If you push the slinky forward a little and then pull it back to its original position, a wave travels in the direction of the slinky's coils. Sound waves are just like that but the medium is all the particles that constitute air.

The electron binding energy for gold essence is. find the longest wavelength( in) of light that could eject electrons from gold in a photoelectric effect trial.

Electron

The electron is a subatomic flyspeck( denoted by the symbol whose electric charge is negative one abecedarian charge. Electrons belong to the first generation of the lepton flyspeck family, and are generally allowed to be abecedarian patches because they've no given factors or substructure. The electron's mass is roughly 1/ 1836th that of the proton.

Quantum mechanical parcels of the electron include an natural angular instigation( spin) of a half- integer value, expressed in units of the reduced Planck constant, ħ. Being fermions, no two electrons can enthrall the same amount state, in agreement with the Pauli rejection principle. Like all abecedarian patches, electrons parade parcels of both patches and swells They can collide with other patches and can be diffracted like light. The surge parcels of electrons are easier to observe with trials than those of other patches like neutrons and protons because electrons have a lower mass and hence a longer de Broglie wavelength for a given energy.

Electrons play an essential part in multitudinous physical marvels, similar as electricity, captivation, chemistry and thermal conductivity, and they also share in gravitational, electromagnetic and weak relations. Since an electron has charge, it has a girding electric field, and if that electron is moving relative to an bystander, said bystander will observe it to induce a glamorous field.

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The magnetic field is the area around a magnet in which there is magnetic force. Moving electric charges can make magnetic fields.

we are able to make this magnetic field more potent by using growing the quantity of electrical cutting-edge going thru the twine or we are able to grow the variety

A magnetic area is a vector field that describes the magnetic affect on shifting electric costs, electric-powered currents, and magnetic materials. A shifting charge in a magnetic area reviews a force perpendicular to its very own velocity and to the magnetic field.

The force is perpendicular to each the velocity v of the price q and the magnetic field B. 2. The significance of the force is F = qvB sinθ where θ is the angle < a hundred and eighty levels among the rate and the magnetic field.

Examples of magnetic force is a compass, a motor, the magnets that maintain stuff at the fridge, teach tracks, and new roller coasters. All transferring expenses supply upward thrust to a magnetic subject and the charges that flow through its regions, revel in a force

This discipline is shaped via the magnetic strains of pressure which run from the north pole to the south pole. these traces can be located to be most crowded at the 2 ends of the magnet which might be the poles i.e the north pole and the south pole.

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The experiment is not accurate since the both rats get the tranquilizer and there is no control setting.

The quest for data and information is what would cause a scientist to perform an experiment. We know that an experiment is one that an experiment is one that we have to find the effect of the independent variable on the dependent variable.

In this case, the independent variable is the administration of the dose of the drug while the dependent variable is the number of hours that the pet rats are made to sleep.

Let us note that an experiment ought to have a control setting. The control setting of the experiment is what would serve to validate the experiment as we know. We can see that this experiment does not have a control setting therefore it is not accurate. This experiment would need to be reviewed a control setting should be added.

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City - A city is defined as a group of people living in one place within a county sharing many common characteristics, especially the system of government. Cities are part of counties and counties are part of states.

A 2D column chart shows the evolution of a data series over time or compares multiple items. Element types are arranged horizontally and data values ​​are displayed vertically to emphasize changes over time. Scatter charts have two value axes. It displays one set of numerical data along the horizontal axis and another set along the vertical axis.

Combine these values ​​into individual data points and display them in irregular intervals or clusters. The main function of charts is to display data and explore topics in more detail. Charts are used when a simple table cannot adequately represent important relationships or patterns between data points.

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According to the given statement 19e degrees north of east have you walked.

The correct option is A

A straight line is, to put it simply, a line without bends. An uncurved line that extends to infinity on both sides is said to be straight.

Even though they have no start or finish, straight lines are represented in everyday life by things like train tracks and freeways.

Focuses on four basic types of straight lines: vertical, horizontal, diagonal from left to right, and diagonal from right to left, as well as potential groupings of each.

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The complete question is -

If you walk 6.0 km in a straight line in a direction north of east and you end up 2.0 km north and several kilometers east. How many degrees north of east have you walked?

A) 19e

B) 45e

C) 60e

D) 71e

Answer:

A. 0s to 1s

Explanation:

ok bro hav a nise dey

 The distance traveled by the race car would be 181.5 meters,

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The speed of the object just before it hits the ground will be equal to,

v = √ ( v₀² + 2 g H )

Equations of motion describe the concept of the motion of an object such as the position, velocity, or acceleration at various times. Three equations of motion are derived for the motion of an object in 1D, 2D, and 3D.

To derive components are displacement(s), velocity, time(t), and acceleration(a). :

The 1st equation of motion is : v = u + at

The 2nd equation of motion is : S = ut + (1/2)at²

The 3rd equation of motion is : v² = u² + 2 g S

Given, the initial velocity of an object u = v₀ in an upward direction so it will be negative, u = - v₀

The displacement of an object is the height of the object from the ground S = H and It is downward so it will be positive.

The acceleration = g as the object moving towards the ground ( positive in downwards ). The final velocity of the object is V before it hits the ground.

Using the 3rd equation of motion to find the velocity of the object,

v² = u² + 2 g S

v² = (- v₀ )² + 2 g h

v = v₀² + 2 g H .

v = √ ( v₀² + 2 g H )

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The net force calculated is 5 N. The total of all forces exerted on an object is known as the net force. A mass can accelerate due to net force. A body is subject to another force whether it is at rest or in motion.

The combined effect (the sum) of all pushing and pulling forces that are really operating on an object is known as the net force. An object will accelerate in the direction of the net force if the pushing and pulling forces acting on it are not equal (a net force acts).When there are a lot of forces acting on a system, the term "net force" is employed.

We now have a 30° - 60° /90° right triangle because this force does produce a 30° angle with the y-axis.

The force of 10N (hyp.) or sin 30 = x/10N

x = 10N sin 30

x = 5 N is used to find the magnitude of x.

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Since, ABCDEF is a regular hexagon,

The measure of the central angle of a regular polygon = [tex]\frac{360}{n}[/tex]

where n = number of sides of the polygon

The measure of the central angle of a regular hexagon =[tex]\frac{360}{6}[/tex] = 60°

That means when we rotate a regular hexagon by an angle in the multiple of 60°, the hexagon overlaps itself.

Therefore, by the rotation of 240° clockwise, point C will replace the position of point A.

The image of hexagon ABCDEF will become CDEFAB.

A rotation matrix is a transformation matrix in linear algebra that is used to make a rotation in Euclidean space. Rotation matrices depict rotations about the origin since matrix multiplication has no effect on the zero vector (the coordinates of the origin). Rotation matrices provide an algebraic description of such rotations and are widely utilized in geometry, physics, and computer graphics computations. In some publications, the term rotation is broadened to cover improper rotations, which are defined by orthogonal matrices with determinants of 1 (rather than +1). These incorporate appropriate rotations and reflections (which invert orientation). In other circumstances, where reflections are not taken into account, the label proper may be omitted. This article adheres to the later convention.

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Answer:when a certain amount of violet light and yellow light shine on a metal surface only violet light produces an electric current describe how an increase in the intensity of each type of light will affect the amount of current produced, how does quantization help to explain these observations? Question thumb_up 100%

Explanation:

An increase in the intensity of violet light will lead to a proportional increase in the amount of electric current produced, as more violet photons will have enough energy to liberate electrons through the photoelectric effect.

However, an increase in the intensity of yellow light will not affect the electric current, as even with higher intensity, yellow photons do not possess sufficient energy to release electrons from the metal surface. This observation can be explained by quantization, which states that light energy is quantized into discrete packets called photons.

Each photon must possess a minimum energy threshold (the work function) to cause electron emission. Violet light photons have higher energy and can overcome the work function, while yellow light photons do not have enough energy and thus cannot produce a current, regardless of their intensity.

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For Antonio to improve his self-awareness skills he should be able to recognise hie strengths and his weaknesses.

Self awareness is the act of being able to recognise your feelings and keep your character under control.

To be a self awareness leader, one should be able to have the following qualities:

Therefore, it can be said for Antonio to improve his self awareness skills, he should be able to recognise his strength and weaknesses and observe how his character affects the people around him.

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Average speed corresponds to the total distance traveled in a specific time interval. Given distance and time information just divide it.

Average speed = 3.23KM/5.34h = 0.604km/h

Hence, you should not have a speed of less than 0.604km/h if you want to catch the sunset.

Average speed is calculated by dividing the total distance something has traveled by the total time it took to travel that distance. Velocity is how fast something is going at a given moment. Average speed measures the average speed while moving. Average speed is calculated by dividing the total distance traveled by the time interval. For example, the average speed of a person who takes him 40 minutes to travel 20 miles north and then 20 miles south (to reach the same place) is 40 miles divided by his 40 minutes.

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The magnitude of the acceleration of the object that can be calculated from the measurements is compared to the "centripetal acceleration" that can be calculated from the speed and the radius is [tex]a_{c}[/tex] = r ( α t )²

The magnitude of the acceleration of the object that can be calculated the measurements is Angular acceleration. If angular velocity and time are given,

α = ω / t

α = Angular acceleration

ω = Angular velocity

t = Time.

[tex]a_{c}[/tex] = v² / r

[tex]a_{c}[/tex] = Centripetal acceleration

v = Tangential velocity

r = Radius

Rearranging angular acceleration formula as,

ω = α t

v = r ω

[tex]a_{c}[/tex] = v² / r

[tex]a_{c}[/tex] = ( r ω )² / r

[tex]a_{c}[/tex] = r² α² t² / r

[tex]a_{c}[/tex] = r ( α t )²

This is the relation between angular acceleration and centripetal acceleration.

Therefore, the comparison is [tex]a_{c}[/tex] = r ( α t )²

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Answer:

1.solid

2.gas

3.liquid

4.liquid and gas

5.gas

6.liquid

7.gas

8.liquid and gas

If a body covers equal distances in equal intervals of time it has uniform speed. If a body covers equal displacement in equal intervals of time it has uniform velocity.

Speed is the rate of change of an object's position with respect to time in any direction. An object will have uniform speed, if the speed of the object remains constant and not varying.

Velocity is the rate of change of an object's position with respect to time in a particular direction. Uniform velocity is a condition in which a body covers equal displacements in equal intervals of time.

Therefore, if a body covers equal distances in equal intervals of time it is said to have uniform speed and if it covers equal displacement in equal intervals of time it is said to have uniform velocity.

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Answer: a = 8.10 m/s^2

Explanation:

The car starts at rest, so:

V0= 0m/s

t= 5.21m/s

S = 110.0 m

Using one of the five uniformly accelerated motion formulas

S= V0t + 1/2 at^2

but V0 = 0 m/s

S = 1/2 at^2

a= 2S/ t^2

a = 2(110m)/ (5.21 s)^2

a = 8.10 m/s^2

The answer is yes because of conservation of momentum. That is, the momentum before collision is equal to the momentum after collision.

Momentum is the product of mass and velocity. It is a vector quantity. And it is measured in Kgm/s

If two vehicles have a head-on collision, the vehicles essentially stick together and travel a certain distance for 20 seconds before coming to a complete stop. The final velocity for both vehicles immediately after the crash can be obtain by using the formula

v = u - at

Where

If you are able to obtain the mass of both vehicles, the initial velocity for Vehicle A, and the final velocity for both vehicles immediately after the crash, then you can determine the momentum of both vehicles before the collision by calculating the momentum of both after the collision because momentum is always conserved.

Or by first calculating the initial velocity for vehicle B by using the formula below

[tex]M_{1}U_{1} - M_{2}U_{2} = (M_{1} + M_{2} )V[/tex]

where

After we obtain initial velocity for vehicle B, we can calculate the momentum of both vehicles before the collision

Therefore, the momentum of both vehicles before the collision can be determined.

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It would be a diode, also called a rectifier. It's used in electronic circuits to control the flow of current between two points.

Individual electronic parts, such as resistors, transistors, capacitors, inductors, and diodes, are connected by conductive wires or traces that allow electric current to pass through them to form an electronic circuit. It is a particular kind of electrical circuit, and typically at least one active component is required for it to be called an electronic circuits as opposed to an electrical one. Signals may be amplified, calculations can be made, and data can be sent from one location to another thanks to the combination of components and connections.

Typically, an electronic circuits can be classed as an analogue, digital, or mixed-signal circuit within rectifiers. The MOSFET is the semiconductor component utilised in electronic circuits the most (metal-oxide-semiconductor field-effect transistor).

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Using speed and distance relation, It take the speed of 299 m to travel 30 cm .

speed is the rate at where someone or something moves is able to operate.

Let us convert cm to m for distance

C = 2.998× 10^8 ms

The relationship between distance, speed, and time is

T =1 ×10^6/8

Because in this case you are being asked how long or time it takes, make it the subject.

Rounding the quotient produces.

Adjust it again to fit the scientific notation.

The result is -

d= c×t

d=2.998×10^8 m/s 10^6 m/s

d=2.998

As a mathematical expression, the time taken for light is 2.998

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It will take 2.5 seconds for the school bus to come to stop.

The initial velocity U of the School bus is 10m/s. As the bus has to come to stop, the final velocity V of the school bus will be 0 m/s.

The Acceleration a is -2m/s² and constant.

Because the Acceleration is constant. We can use the equations of motion,

Let say the School bus stopes after Reaching a distance D.

So, applying the equation of motion,

V = U + at

0 = 10 - 4t

-10 = -4t

t = 2.5 seconds.

So the school bus will come to stop after 2.5 seconds.

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