what is the gauge pressure profile of the water against a section of the container? arrow lengths against the wall indicates pressure magnitude.

The wavelength of light that is inclined at a specified angle when falling on double slits is calculated to be 428.57 nm.

Angle = 30°

Order of interference m = 3

Distance between the slits d = 3 μ m = 3 × 10⁻⁶ m

We know the relation between wavelength, order of interference and distance as,

λ = d sinθ/(m+1/2)

By putting in the values, we have,

⇒ (3 × 10⁻⁶× sin30°)/(3+1/2) = 4.2857 × 10⁻⁷ m

By converting it to nm, we have,

⇒ 4.2857 × 10⁻⁷ × 10⁹ = 428.57 nm

Thus, the required wavelength of light is calculated to be 428.57 nm.

The question is incomplete. The complete question is 'Calculate the wavelength of light that has its third minimum at an angle of 30.0∘ when falling on double slits separated by 3.00 μm. Explicitly, show how you follow the steps in Problem-Solving Strategies for Wave Optics.'

To know more about wavelength:

https://brainly.com/question/16636743

#SPJ4

The wavelength of the harmonic wave is 90 cm, if it completes 180 vibrations per minute and travels 300 cm in 10 s.

Time taken to complete 180 vibrations, = 1 minute = 60 sec

Number of vibrations completed by wave in 1 sec, = 180/60 = 3

So the frequency, f = 3 Hertz

Time taken to complete 1 vibration, T = 1/3 seconds

Wavelength is the distance travelled by the wave in one vibration/cycle. We know one cycle takes 1/3 seconds to complete, so the distance travelled by the wave in 1/3 second = (300/10) × (1/3) = 90 cm

So the wavelength λ = 90 cm.

To know more about wavelength, here

https://brainly.com/question/13533093

#SPJ4

The weight measurement was off by 0.8% of the accepted value.

Weight is a measure of the gravitational force that an object experiences due to its mass. Weight is typically measured in Newtons (N), and the formula for weight is mass multiplied by the acceleration due to gravity (g). Weight is an important factor in many activities such as sports, exercise, and even everyday tasks. The amount of weight an object carries affects its balance, stability, and momentum. Weight is an important factor to consider when using machines and tools.

Relative error is the ratio of the amount of error to the accepted value. To calculate the relative error in this weight measurement, we can use the following equation:

Relative Error = (17.7 g/2.2 kg) * 100%

The relative error in this weight measurement is 0.8%. This means that the weight measurement was off by 0.8% of the accepted value.

To know more weight click-
https://brainly.com/question/229459
#SPJ4

The net flux through the cube is equal to [tex]2E*d^2[/tex]

The net flux through the cube is calculated by the flux through each of the six faces of the cube. The flux through a face is calculated by the electric field through the face multiplied by the area of the face.

For this situation, the electric field is perpendicular to two inverse faces of the cube, which means that the flux through these two faces is the maximum possible (since the field is perpendicular to the face).

The flux through these two faces is given by:

[tex]Flux = E * A = E * d^2[/tex] (where E is the electric field and d is the side length of the cube)

The electric field is parallel to the other four faces of the cube, which means that the flux through these faces is zero (since the field is parallel to the face and not passing through it).

Therefore, the net flux through the cube is the sum of the flux through the two faces where the field is perpendicular:

[tex]Net flux = 2 * (E * d^2) = 2E*d^2[/tex]

So the net flux through the cube is equal to [tex]2E*d^2[/tex], with E being the magnitude of the uniform electric field and d is the side length of the cube.

To learn more about net flux:

https://brainly.com/question/26289097

#SPJ4

(i) The magnitudes of the electric fields they separately create at a radial distance of 6 cm is [tex]E_{a}[/tex]=[tex]E_b}[/tex]. and (ii) The magnitudes of the electric fields they separately create at radius 4 cm is [tex]E_{a} =E_{b}[/tex], so the correct option is option b.

A conductor refers to a material that allows an electric current to flow through it with ease. In other words, it has a low electrical resistance. Conductors are materials that have a high number of free electrons that are able to move freely through the material. Examples of conductors include copper, aluminum, gold, and silver. These materials are commonly used in the electrical industry to make wires and other electrical components that need to conduct electricity. In addition to materials, a conductor can also refer to a person or an organization that is responsible for directing or leading an orchestra or a choir. In this context, a conductor is in charge of maintaining the ensemble's rhythm and intonation, and interpreting the score in a way that brings out the music's emotional content and intended meaning.

(i) The magnitude of the electric field created by a charged conductor is given by the formula E = [tex]\frac{kq}{r}[/tex], where k is the Coulomb constant, q is the charge, and r is the distance from the center of the sphere.

For a good conductor, like sphere A, the charge will be distributed evenly on the surface of the sphere. So, the electric field at a radial distance of 6cm will be Eₐ = [tex]\frac{kq}{r^{2} }[/tex] = [tex]k\frac{210^{-6} }{(619^{-2} )}^{2} =\frac{k}{72}[/tex]

For an insulator, like sphere B, the charge is distributed uniformly throughout its volume. The electric field at a radial distance of 6cm will be [tex]E_{b}[/tex]=  [tex]\frac{kq}{r^{2} }=k\frac{210^{-6} }{(619^{-2} )}^{2} =\frac{k}{72}[/tex]

As we can see, the magnitudes of the electric fields created by both spheres are equal, so the answer is (b) [tex]E_{a} =E_{b}[/tex]

(ii) For the radius of 4cm, the electric field created by sphere A and sphere B will

[tex]E_{a} =\frac{kq}{r^{2} }=k\frac{210^{-6} }{(410^{-2} )^{2} } =\frac{k}{16}\\E_{b} =\frac{kq}{r^{2} }=k\frac{210^{-6} }{(410^{-2} )^{2} } =\frac{k}{16}\\[/tex]

As we can see, the magnitudes of the electric fields created by both spheres are equal at a radius of 4cm, so the answer is (b) [tex]E_{a} =E_{b}[/tex]

To know more about electric fields visit:

https://brainly.com/question/26446532

#SPJ4

The electric potential difference through which the proton is moved is [tex]2.49 * 10^-18[/tex]V.

The electric potential difference through which the proton is moved can be calculated using the formula:

V = ΔU/q

Where V is the electric potential difference, ΔU is the change in electric potential energy, and q is the charge of the proton.

Given that the electric potential energy increases from [tex]2.0 * 10^-18[/tex] J to [tex]6.0 * 10^-18[/tex] J and the charge of the proton is 1.602 x 10^-19 C, we can substitute these values into the formula to find the electric potential difference:

V = (6.0 x 10^-18 J - 2.0 x 10^-18 J) / 1.602 x 10^-19 C

V = 4.0 x 10^-18 J / 1.602 x 10^-19 C

V = 2.49 x 10^-18 V

Therefore, the electric potential difference through which the proton is moved is [tex]2.49 x 10^-18[/tex] V.

To know more about  electric potential difference visit:

https://brainly.com/question/27091481

#SPJ4

The refractive index of the glass is 1.16, if the thickness of the glass slab is 2.25 cm, and the diameter of the circle is 7.60 cm.

incident angle of the light,θ = 90°

Let the angle of internal refraction is θ₁

Let the refractive index of the glass slab, = μ₁

Refractive index of vacuum, μ₂ = 1

By Snell's law, μ₁sinθ₁ = μ₂sin90

Radius of the circle, R = 7.6/2 = 3.8 cm

Thickness of the slab, and radius of the circle, R, makes the right angle triangle with hypotenuse(AC). So applying the pythagorus theorem,

AC² = 2.25² + 3.8²

AC = √(2.25² + 3.8²)

AC = 4.42

So sinθ₁ = 3.8/4.42

sinθ₁ = 0.86

μ₁ × 0.86 = μ₂×sin90

μ₁ × 0.86 = 1 × 1

μ₁ = 1/0.86

μ₁ = 1.16

So the refractive index of the glass slab, μ₁ = 1.16

To know more about refractive index, here

https://brainly.com/question/23750645

#SPJ4

The direction of the field would be towards the positive end of the charge.

We know that the electric field has to do with the region in space where the influence of a charge can be felt. We can see from the question that there is a region around the −10 nC charge where its influence is felt.

Thus, we can see that that the direction of the charge would be in the positive direction to the charge that has been given which is around the charge that has a magnitude of −10 nC.

Learn more about electric field:https://brainly.com/question/15800304

#SPJ1

Its surface is cooler than the surface of the sun is the statement that we can infer from its red color.

Betelgeuse is also called Alpha Orionis. It is the second brightest star in the constellation Orion, thus marking the eastern shoulder of the hunter. Its name is derived from the Arabic term, which means “the giant’s shoulder.” It is one of the most luminous stars in the sky at night.

Having an apparent magnitude of about 0.6 it is a variable star. Its size is roughly 764 times as that of the Sun. As the apparent magnitude of this star is 0.6 which is a comparison with the sunlight, we can say it is cooler than the surface of the sun.

Hence the correct option is A.

--The given question is incomplete, the complete question is,

"betelgeuse is the bright red star representing the left shoulder of the constellation orion. all the following statements about betelgeuse are true. which one can you infer from its red color? a) Its surface is cooler than the surface of the Sun. b) It is much more massive than the Sun c) It is much brighter than the Sun d) It is moving away from us

To know more about Betelgeuse, here

https://brainly.com/question/14527447

#SPJ4

The maximum amount of trans fat as a percentage that could be in this cereal should be 0.5%.

This cereal is formulated to be as healthy as possible, which is why we limit the amount of trans fat to 0.5% or less. Trans fat is an unhealthy form of fat that has been linked to several health conditions, so we strive to keep our trans fat content as low as possible. By limiting trans fats to 0.5% or less, we are confident that this cereal is a healthy choice.

This cereal contains no more than 0.5% trans fat, as mandated by the FDA. Trans fat is an unhealthy type of fat that can increase bad cholesterol levels and the risk of heart disease and stroke. To ensure optimal health and safety, this cereal only contains the amount of trans fat that is legally allowed.

To learn more about trans fat, click here:

https://brainly.com/question/29593073

#SPJ4

Net work the engine perform during the cycle is b) 330 J.

The net work done by a heat engine is the difference between the heat absorbed by the engine and the heat exhausted. Therefore, the net work done by the engine during a cycle is

1240 J - 910 J = 330 J.

How does the temperature of the hot reservoir affect the efficiency of a heat engine?

The efficiency of a heat engine is directly related to the temperature of the hot reservoir. The higher the temperature of the hot reservoir, the more thermal energy is available for conversion into work. This means that the efficiency of the heat engine increases as the temperature of the hot reservoir increases. The maximum efficiency of a heat engine is given by the Carnot efficiency, which is only achievable when the temperature of the cold reservoir is 0 K (absolute zero) and the temperature of the hot reservoir is infinite.

To know more about cold reservoir visit:

brainly.com/question/14142895

#SPJ4

After 150 seconds, the rocket is moving at a velocity of 32700 m/s and has traveled 1,623,500 meters.

A constant acceleration is a change in velocity that does not change over time. If a car accelerates by 20 mph one minute and then another 20 mph the next, its average acceleration remains constant at 20 mph per minute.

We can use the equations of motion to calculate the speed and distance traveled of the rocket. The equation for velocity as a function of time is:

v = at

where v is the velocity, a is the acceleration, and t is the time. Substituting in the given values, we get:

v = 218 m/s * 150 s = 32700 m/s

To find the distance traveled, we can use the equation:

d = 1/2 * at^2

Substituting in the given values, we get:

d = 1/2 * 218 m/s^2 * 150 s^2 = 1,623,500 m

So after 150 seconds, the rocket is moving at a velocity of 32700 m/s and has traveled 1,623,500 meters.

Learn more about velocity here:

https://brainly.com/question/18084516

#SPJ4

The maximum speed in which the car can move on the curve without skidding to the outside of the curve is 12.46 m/s.

The maximum speed in which the car can move on the curve without skidding to the outside of the curve is calculated by using the following formula.

v = √ ( rg tanθ )

where;

v = √ ( 46 x 9.8 x tan 19 )

v = 12.46 m/s

Learn more about maximum speed on curve here: https://brainly.com/question/14467643

#SPJ1

The reasons why conifer sap is important include:

Conifer sap is rich in sugars and other nutrients that the tree needs to grow and survive. It is transported from the roots to the branches and leaves where it is used to fuel the tree's growth and metabolism.

Conifer sap is also known to contain compounds that protect the tree from pathogens and pests. These compounds act as a natural defense mechanism, helping the tree to resist infections and infestations.

Find out more on sap at https://brainly.com/question/9287303

#SPJ1

The distance where the potential of two similar charges (in terms of magnitude and charge) will be zero at 2.5 cm from both sides. That is at Exect middle of both charges.

For finding the potential at any point due to a point charge(q0) is(Vr) = 1/4π∈*q0/r.

if both the charges are the same sign then the point will be in between of both the charges placed,

so Let the distance where the potential is zero be x in the left side so on the right side it will be 5-x.

as lets assume left charge if placed at the origin

so 1/4π∈*q0/x=1/4π∈*q0/5-x. ............. As both the potentials are equals

so 1/x = 1/5-x

x=5-x

so 2x =5 and here x= 2.5 cm

Learn more about Electric Potential: https://brainly.com/question/14306881

#SPJ4

To maintain an exposure level equivalent to f/16 at 1/30 of a second, the new stop should be f/5.6. Due to their inverse relationship, the aperture and shutter speed must be adjusted to account for changes in either one by photographer.

When the shutter speed is increased from 1/30 of a second to 1/500 of a second, the aperture must likewise be changed in order to keep the same exposure level. The amount of light entering the camera, which is managed by the aperture and shutter speed, determines the exposure level. The "exposure triangle" describes the connection between aperture, shutter speed, and exposure. The "reciprocal rule," which dictates that if the shutter speed is increased by a factor of 16, the aperture should be reduced by a factor of 4, should be followed by the photographer in order to maintain the same exposure level. In this instance, the new stop should be f/4 since the photographer wishes to raise the shutter speed from 1/30 to 1/500 while maintaining the same exposure level.

learn more about photographer here:

https://brainly.com/question/25379778

#SPJ4

"A force is being applied to the mass." that is option A is happening if we have a rigid, unchanging mass and we observe it accelerating.

A force is an effect in physics that may modify the velocity of an item. A force can cause a mass item to change its velocity, or accelerate. Intuitively, force may be characterized as a push or a pull. A force is a vector quantity since it has both magnitude and direction. The term "force" has a specific meaning in science. At this level, it is quite acceptable to refer to a force as a push or a pull. A force is not something that an item possesses or possesses. Another item applies a force to another. The concept of a force is not restricted to living or non-living entities.

Here,

Newton's second law of motion: F = m · a.

F -  force applied.

m - mass of the object receiving the force.

a - the acceleration of the object.

One newton is the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in direction of the applied force. The weight of an object is the amount of force acting on the object due to gravity. SI unit for weight is newton (N).

"There is a force acting on the mass." Option A is what happens when we see a stiff, unchanging mass accelerating.

To know more about force,

https://brainly.com/question/29044739

#SPJ4

The kinetic energy of the block of wood would be 1148 m/s. The result is obtained by using the law of conservation of momentum.

The law of conservation of momentum states that the momentum of a closed system before and after the collision is constant. A closed system means there is no external force acting on the system. The formula would be:

∑p initial = ∑p final

p₁ + p₂ = p₁' + p₂'

m₁v₁ + m₂v₂ = m₁v₁' + m₂v₂'

Where

A bullet moving through a block of wood that is at rest. It has

Find the kinetic energy of the block that results from collision!

If a bullet moving through a block of wood, it means that the bullet will be united with the block of wood. Then, the speed of both bullet and wood after collision is the same, v'.

The speed of the bullet is

m₁v₁ + m₂v₂ = m₁v₁' + m₂v₂'

m₁v₁ + m₂v₂ = (m₁ + m₂)v'

v' = (m₁v₁ + m₂v₂)/(m₁ + m₂)

v' = (24(1200) + 1(-100))/(24 + 1)

v' = (28800 - 100)/25

v' = (28700)/25

v' = 1148 m/s

The kinetic energy of the block of wood would be

KE₂ = ½m₂v₂'

KE₂ = ½(1)(1148)²

KE₂ = 13,171,904 Joule

Hence, after the collision, the kinetic energy of the block of wood is 13,171,904 Joule.

Learn more about collision here:

https://brainly.com/question/29056127

#SPJ4

The value shown by the letter E is 24V.

Define resistance

A material's ability to obstruct the flow of electrical current is referred to as resistance. The capital letter R serves as a symbol for it. A conductor's ability to obstruct the flow of charges through it is referred to as resistance.

A closed loop is referred to as a circuit where electrons can move. The circuit receives power from an electricity source, like a battery. There won't be any electron movement until the circuit is finished, or until it has made a full circuit loop back to the electrical source.

V = IR

For circuit 5, V = E

I = 8A

R = 3

E = 8*3 = 24V

To learn more about resistance use link below:

brainly.com/question/28135236

#SPJ1

Answer:

8

Explanation:

The best way to increase the mechanical advantage of the class 2 lever is to move the load closer to the fulcrum.

option B.

The mechanical advantage of a simple machine is the ratio of output force to input force. It is also the ratio of load overcame by a simple machine to the effort applied by the simple machine.

Mathematically, the formula for mechanical advantage of a simple machine is given as;

M.A = output force / input force

M.A = Load / effort

Efficiency of machine = M.A/V.R x 100% = ( distance travelled by load x load ) / ( distance travelled by effort x effort )

Thus, to increase the mechanical advantage requires decrease in the distance travelled by the effort.

Learn more about mechanical advantage here: https://brainly.com/question/25984831

#SPJ1

Answer : Original Speed is 6m/s while acceleration is 0.3m/s^2.

What is speed?

--In everyday use and in kinematics, the speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time;

-- it is thus a scalar quantity.

Here in this question we have given final speed , we have to find the intial speed as well as the acceleration of the body.

d = V1 + V2 /2 × t

45 = V1 + 3/2 × 10

V1 = 6 m/s.

Hence initial speed of body is 6m/s .

By using first equation of motion we find the acceleration

we get acceleration is 0.3 .

What is velocity?

-- Velocity is the directional speed of an object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time .

Learn more about acceleration from https://brainly.com/question/605631.

#SPJ4

Because the acceleration caused by gravity affects escape velocity. Therefore, the moon's escape velocity must be lower than that of the earth. Moreover, due to a lower escape velocity.

Ve therefore equals 11.2 km/s x 103 m/s. On Mars, the escape speed is approximately 40,270 kmph, or 11,186 m/s. For instance, when a rocket is used to propel a spacecraft into orbit, the velocity obtained must be higher than the orbital speed to prevent the rocket from returning to Earth.

Escape velocity is indeed the bare minimum speed at which a body must be propelled in order to escape the earth's gravitational pull. The smallest speed at which an object must move in order to escape the gravity field is.

TO KNOW MORE ABOUT VELOCITY VISIT:

https://brainly.com/question/18084516

SPJ1

A skier with mass of 62 kg is sliding down a snowy slope. The coefficient of kinetic friction is 0.0738 N

The coefficient of kinetic friction can be found using the formula:

Friction = coefficient of kinetic friction × Normal force

We know that the friction force is 45 N and the normal force is equal to the skier's weight, which can be found using the formula

Weight = mass × gravity

Where the mass is 62 kg and the acceleration due to gravity is approximately :9.8 m/s²

So the normal force is: 62 kg × 9.8 = 607.6 N

Therefore, the coefficient of kinetic friction is: Friction / Normal force  or approximately

= [tex]\frac{45}{607.6}[/tex] = 0.0738

The force that opposes the motion of two surfaces in contact as they slide against one another is known as kinetic friction, but other names for it include sliding friction and dynamic friction. The properties of the two surfaces in contact, such as the roughness of their surfaces and the materials they are made of, determine its strength. It acts in the opposite direction of the force applied to an object.

To know more about force :

brainly.com/question/13191643

#SPJ4

Due to the satellite's overshooting circular course and movement away from Earth against the pull of gravity, the speed of satellite in such a closed circular orbit would be greater than 8 km/s.

The direction of gravity always seems to be toward the core of the Earth when a satellite travels around it in a circular orbit.

Thus, due to the satellite's overshooting circular course and movement away from Earth against the pull of gravity, the speed of satellite in such a closed circular orbit would be greater than 8 km/s.

To know more about the pull of gravity, here

https://brainly.com/question/28854345

#SPJ4

The velocity of the second ball will be 4.1 m/s towards the left, If the initial velocity of the second ball is 3.5 m/sec towards right.

Initial velocity of first ball, v₁ = +4.1 m/s [positive: towards the left]

Initial velocity of second ball, v₂ = -3.5 m/s [negative: towards the right]

final velocity after collision of first ball, v₃ = -3.5 m/s

Let the final velocity after collision of second ball, = v₄

Mass of each ball is 0.35 kg

By the law of conservation of momentum,

m₁v₁ + m₂v₂ = m₃v₃ + m₄v₄

0.35×(4.1) + 0.35(-3.5) = 0.35×(-3.5) + 0.35×v₄

4.1 - 3.5 = -3.5 + v₄

v₄ = +4.1

Positive sign indicates that the velocity will be towards the left.

To know more about velocity, here

https://brainly.com/question/18084516

#SPJ4

The maximum amount of static friction that the tyres can generate on the road can be used to calculate the maximum speed at which the car can go without slamming off the interstate.

The only force acting on the car when friction is eliminated is gravity, which pulls the vehicle towards the curve's centre.

The formula for calculating the maximum static friction force is

f_max = μ_s * m * g, where

μ_s = coefficient of static friction

m = mass of the car

g = acceleration due to gravity (9.8 m/s^2)

The maximum static friction force can be computed as follows using an assumed static friction coefficient of 0.7:

f_max = 0.7 * m * 9.8 = 6.86 * m N

The formula for the gravitational force is:

f_gravity = m * g * sin(θ), where

θ = bank angle (10°)

The difference between the gravitational force and the maximal static friction force is the net force operating on the automobile. The car won't skid off the road if the net force is zero.

The formula for calculating the maximum velocity is:

v = sqrt(R * g / sin(θ))

where

R = radius of the curve (20 m)

By substituting the values, we get:

v = sqrt(20 * 9.8 / sin(10)) = 26.51 m/s = 94.91 km/h

As a result, the maximum speed at which the car may move without swerving off the highway is roughly 94.91 km/h.

To know more about gravitational force, visit:

https://brainly.com/question/29276623

#SPJ4

Simple harmonic oscillation occurs when an object regularly returns to an equilibrium position and experiences a position-dependent force of the form , where is some positive constant.

Harmonic oscillation is a type of periodic motion where an object oscillates back and forth along a path in a predictable and regular pattern. Examples of harmonic oscillation include the motion of a simple pendulum, the oscillation of a spring, and the vibration of a guitar string. The motion of an object undergoing harmonic oscillation can be described mathematically using a sinusoidal function such as sine, cosine, or a combination of the two.

This force is often associated with a mass-on-a-spring system, and the motion of the object can be defined by a sine or cosine curve.

To learn more about harmonic oscillation
https://brainly.com/question/29273618
#SPJ4

A gray kangaroo can bound across a flat stretch of ground with each jump carrying it 8.0 m from the takeoff point, so his horizontal speed is 12.69 m/sec.

The projectile appears to be travelling straight forward without changing directions, according to the horizontal speed. The moment the projectile is launched, no net forces are exerted in a horizontal direction. As a result of zero acceleration, the projectile's horizontal speed remains constant throughout the trajectory motion.

To aid in their hopping, kangaroos have modified their bodies to include robust tails and larger rear feet. Some kangaroo subspecies, like red and grey kangaroos, are capable of successfully jump 10 feet vertically, 40 feet horizontally, and at speeds of over 30 mph because to these modifications.

To learn more about horizontal speed here

brainly.com/question/20522350

#SPJ4

The celestial model doesn't shows the Sun and the stars moving around the earth.

Celestial globes depict the apparent positions of the stars in the sky. They exclude the Sun, Moon, and planets since their positions differ from those of the stars, but the ecliptic, along which the Sun moves, is depicted.

A fictitious sphere surrounding the Earth in which the stars, Sun, Moon, and planets appear to reside.

The celestial sphere is a hypothetical sphere centered on the Earth onto which all celestial bodies can be projected. An observer on the Earth's surface can only view half of the celestial sphere at any given moment because the other half is hidden beneath the horizon.

For more information on celestial sphere kindly visit to

https://brainly.com/question/13196153

#SPJ4

Answer:

Explanation:

I think it is the top one as the formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre.

But I'm not 100% sure