a substance that has high reactivity

The light ray will travel at an angle of approximately 26.8 degrees off of normal inside the plastic. When a light ray travels from air into a flat piece of plastic with an index of refraction of 1.30 at an angle of 44.5 degrees off the plane of the surface, it will refract and change direction.

The angle that the light ray will travel inside the plastic can be found using Snell's Law, which states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the indices of refraction of the two media:

sin(θ1) / sin(θ2) = n2 / n1

where θ1 is the angle of incidence (measured from the normal), θ2 is the angle of refraction (also measured from the normal), n1 is the index of refraction of the first medium (in this case, air), and n2 is the index of refraction of the second medium (in this case, the plastic).

We are given θ1 = 44.5 degrees and n1 = 1 (since air has an index of refraction very close to 1). We are also given n2 = 1.30. Solving for θ2, we get:

sin(θ2) = n1 / n2 * sin(θ1) = 1 / 1.30 * sin(44.5 degrees) ≈ 0.442

Taking the inverse sine of both sides, we get:

θ2 ≈ 26.8 degrees

Therefore, the light ray will travel at an angle of approximately 26.8 degrees off of normal inside the plastic.

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The potential impacts of global climate change on thermohaline circulation in the oceans is increasing the rate of circulation. That is option D.

The thermohaline circulation is defined as the process by which deep-ocean currents are driven by differences in the water's density, which is controlled by temperature (thermo) and salinity (haline).

When there is global climate change increased temperature of water masses would cause these currents to flow faster given the higher kinetic energy of the water molecules.

Therefore, there is increase in rate of circulation when there is global climate change.

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The system, after the appearance of friction causing energy dissipation, exhibits damped harmonic motion.

Initially, when the object was oscillating in simple harmonic motion, there was no external force causing energy loss or dissipation. However, with the sudden appearance of friction, an opposing force is introduced that acts against the motion of the object. This frictional force does work against the system, converting some of the mechanical energy into other forms such as heat or sound energy.

As energy is continuously dissipated from the system, the amplitude of the oscillations gradually decreases over time. This phenomenon is known as damping. Damping affects both the amplitude and the frequency of the oscillations. The object's motion is no longer purely periodic, and it deviates from the idealized behavior of simple harmonic motion.

In damped harmonic motion, the object still oscillates around an equilibrium position, but the amplitude of the oscillations decreases exponentially with time. This occurs because the energy dissipation due to friction reduces the total mechanical energy of the system over each oscillation cycle.

The mathematical description of damped harmonic motion involves a damping factor or damping coefficient, which determines the rate at which the amplitude decreases. In the absence of external forces, the damping force is typically proportional to the velocity of the object. This relationship leads to a differential equation known as the damped harmonic oscillator equation, which governs the motion of the system.

In summary, when friction appears and causes energy dissipation in an object oscillating in simple harmonic motion, the system transitions to damped harmonic motion, characterized by decreasing amplitude and a deviation from the idealized behavior of simple harmonic motion.

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Answer:

4.8 A

Explanation:

Voltage = current x resistance

(V = IR)

12 = I (0.5 +2)

I = 4.8 A

Answer:

low-mass star.

Explanation:

Pls, choose me as brainliest!

Answer:

Astronomers are saying that we are made of the same stuff that stars are made out of.

Explanation:

Stars are made of protons, neutrons, and electrons. Just like us

When two strings that have different thicknesses are compared, it will affect only one parameter, and that is wavelength. The rest of the parameters, including wave frequency, wave speed, and tension, will be constant for both strings.The explanation behind this is quite simple.

When we talk about wave frequency, we refer to the number of complete waves that pass by a given point in a certain period of time. When strings vibrate, the number of waves produced is determined by the vibrating source. The wave frequency is independent of the string's physical properties.

Wave speed refers to the speed at which the wave travels through the medium. The wave speed depends only on the medium, in this case, the string. Since both strings are made of the same material, wave speed will remain the same.Tension, on the other hand, is related to the force that is applied to the string to make it vibrate. The amount of tension in the string, however, is not dependent on the string's thickness.

Wavelength is the distance between two consecutive crests or troughs of a wave. The wavelength depends on the wave speed and the frequency. Since wave speed and wave frequency are constant for both strings, only the wavelength will be different if the strings have different thicknesses.

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Answer:

A grain of sand will sink because sand is more dense than water. Therefore, the sand sinks. Students should realize that if an object weighs more than an equal volume of water, it is more dense and will sink, and if it weighs less than an equal volume of water, it is less dense and will float.

The conclusion about the direction of motion of the object after the application of the additional force is the object will not move in either the left or right direction, because the net force will be zero.

In physics, a force is an influence that can change the motion of an object.

The object initially encountered unbalanced forces of 10 N from the right and 17 N from the left, resulting in a net force of 7 Netwons, which caused the object to travel in the direction of the right.

The object ceased to move in either direction when a force of 7 Newtons was added from the right, as the net force decreased to zero, creating balanced forces from both directions.

Therefore, the object will continue to move with a constant velocity.

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Answer: An atom's emission of light with a specific amount of energy confirms that atoms must have a dense central mass surrounded by electrons at a distance

plz mark brainliest

Answer:

It's B, electrons emit and absorb energy based on their position around the nucleus.

An interference pattern with constructive and destructive interference bands is formed when two sources broadcast identical waves. The above sources are in phase, which means they emit peaks at the same time.

Condition for constructive interference: ΔL = nλ, where n is any integer. Condition for destructive interference: ΔL = (n + ½)λ, where n is any integer.

Difference in paths: "u2206x = x A - x B = 0 - x" (a) x = -8 cm

∆x = 0 - (-8) = 8 cm = 2λ

∆x = 2λ (same phase) (same phase)

The outcome is constructive interference (b) x = -6 cm.

∆x = 0 - (-6) = 6 cm = 1.5λ "\ "2206x = (1 + \\frac{1}{2})

\u03bb" (out of phase) (out of phase)

As a result, destructive interference (c) x = -5 cm " "2206x = 0 - (-5) = 5; cm = frac544

\u03bb

" \s ∆x = 1.25λ

Difference in phase "= 1.25 \\times 2\u03c0 = 2.5\u03c0 "Alternatively, phase difference = 0.5 = /2

Phase difference d) x = -4 cm as a result

∆x = 0 - (-4) = 4 cm = λ \s ∆x = λ (same phase) (same phase)

The outcome is constructive interference (e) x = -3 cm.

∆x = 0 - (-3) = 3 cm "= \\frac{3}{4}

\u03bb

" \s ∆x = 0.75λ

Difference in phase "= 0.75 \\times 2\u03c0 = 1.5\u03c0 "The result is a phase difference.

(f) x = -2 cm

∆x = 0 - (-2) = 2 cm = 0.5λ \s ∆x =0.5λ (out of phase) (out of phase)

As a result, destructive interference occurs.

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Answer: the answer given below

(a) Explanation: The impulse on an object is given by the change in momentum of the object. Before the collision, the bullet has momentum p1 = mv0 and the brick has momentum p2 = 0, since it is stationary. After the collision, the combined bullet-brick system has momentum p3.

Conservation of momentum requires that the total momentum before the collision is equal to the total momentum after the collision:

p1 + p2 = p3

mv0 + 0 = (m + M)V

where V is the velocity of the combined bullet-brick system after the collision. Solving for V, we get:

V = (mv0) / (m + M)

The impulse on the bullet during the collision is equal to the change in momentum of the bullet:

J_bullet = p3 - p1 = (m + M)V - mv0

Substituting the expression for V we found earlier:

J_bullet = (m + M)(mv0) / (m + M) - mv0 = 0

Therefore, the impulse on the bullet is zero during the collision.

On the other hand, the impulse on the brick during the collision is:

J_brick = p3 - p2 = (m + M)V - 0 = (m + M)(mv0) / (m + M) = mv0

Therefore, the magnitude of the impulse acting on the brick is equal to the initial momentum of the bullet, mv0, and it is in the same direction as the initial velocity of the bullet.

In summary, during the collision of the bullet and the brick, the impulse acting on the bullet is zero, while the impulse acting on the brick is mv0 in the direction of the initial velocity of the bullet.

(b) We can use the principle of conservation of momentum to solve for the velocity of the brick-bullet combination just after the collision. The total momentum of the system (bullet, brick, and Earth) is conserved before and after the collision. Initially, only the bullet has momentum, which is given by p1 = m*v0, and the momentum of the brick and Earth is zero. After the collision, the bullet becomes embedded in the brick, and the combined system of the brick-bullet has momentum p2. Since the momentum of the Earth is negligible compared to that of the bullet and brick, we can treat the system as closed and apply conservation of momentum:

p1 = p2

m*v0 = (M + m)*v

where v is the velocity of the combined system just after the collision.

Solving for v, we get:

v = (m*v0) / (M + m)

Therefore, the magnitude of the velocity of the brick-bullet combination just after the collision is:

|v| = |(m*v0) / (M + m)|

The direction of the velocity is upward, as the system swings up after the collision due to the conservation of momentum.

(c) The initial kinetic energy of the system is the kinetic energy of the bullet just before the collision, which is given by:

KE1 = (1/2)mv0^2

The final kinetic energy of the system is the kinetic energy of the combined brick-bullet system just after the collision, which is given by:

KE2 = (1/2)*(M + m)*v^2

Substituting the expression we found for v:

KE2 = (1/2)(M + m)[(mv0) / (M + m)]^2

KE2 = (1/2)(m*v0^2) / (1 + M/m)

The ratio of the final kinetic energy to the initial kinetic energy is:

KE2 / KE1 = [(1/2)(mv0^2) / (1 + M/m)] / [(1/2)mv0^2]

KE2 / KE1 = 1 / (1 + M/m)

Therefore, the ratio of the final kinetic energy of the brick-bullet combination immediately after the collision to the initial kinetic energy of the brick-bullet combination is:

KE2 / KE1 = 1 / (1 + M/m)

(d)To determine the maximum vertical position reached by the brick-bullet combination, we can use conservation of energy, assuming there is no energy loss due to friction or other dissipative forces. At the maximum height, the kinetic energy of the system is zero, and all the initial kinetic energy has been converted to potential energy due to the height above the initial position.

The initial total energy of the system is the sum of the initial kinetic energy of the bullet and the gravitational potential energy of the brick:

E1 = (1/2)mv0^2 + Mgh1

where h1 is the initial height of the brick above the ground, and g is the acceleration due to gravity.

At the maximum height, the final total energy of the system is the potential energy due to the height above the ground:

E2 = (M + m)gh2

where h2 is the maximum height reached by the brick-bullet combination above the initial position.

Since there is no energy loss, we can set the initial energy equal to the final energy:

E1 = E2

Substituting the expressions for E1 and E2 and solving for h2, we get:

(M + m)gh2 = (1/2)mv0^2 + Mgh1

h2 = [(1/2)mv0^2 + Mgh1] / [(M + m)*g]

Simplifying, we get:

h2 = (1/2)v0^2 / g + h1(M/m) / (1 + M/m)

Therefore, the maximum vertical position above the initial position reached by the brick-bullet combination is:

h2 = (1/2)v0^2 / g + h1(M/m) / (1 + M/m)

Hope this helps :)

Answer:

1.16 m/s

Explanation:

Mass of first ice; m1 = 26 kg

Mass of second ice; m2 = 12 kg

Velocity of first ice; v1 = 1.7 m/s

Velocity of second ice; v2 = 0 m/s

From inelastic collision, the formula we will use is;

m1•v1 + m2•v2 = (m1 + m2)v'

Where v' is the final velocity of the combined ice chunks

Plugging in the relevant values gives;

(26 × 1.7) + (12 × 0) = (26 + 12)v'

44.2 = 38v'

v' = 44.2/38

v' ≈ 1.16 m/s

Answer:

103.J

Explanation:

Given data

Mass= 5kg

Height= 2.1m

g=9.81m/s^2

Required

The potential energy

PE= mgh

substitute

PE= 5*9.81*2.1

PE=103.J

Given,

The velocity of the spaceship in as observed by an observer at the earth, v=0.75c

The time interval as observed by the observer on the earth, t₁=2.5 s

The time elapsed in the ship's frame of reference is given by,

On substituting the known values,

Thus the time elapsed for an observer in the spaceship is 3.79 s

Cantilever beam capacitance at time t, expressed as C= U's rate of change is therefore inversely proportional to x 2.

Date Updated: 27 June 2022. (00 : 00) Solution: A capacitor's capacitance is determined by dividing the amount of charge on either of its conductor plates by the potential difference between its conductors.

QpropV or C=(Q)/(V). The coulomb per volt and farad is the SI unit for capacitance (F).

The fundamental equation for capacitors is charge (= capacitance x voltage, or Q = C x V. We gauge capacitance by series or in parallel, which is the capacity that holds one coulomb (specified as the charge delivered by one ampere inside one minute) of charge per one farad.

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Answer:

i think it is newtons third law of motion but i'm not sure sorry.i just really need point i don't know the answer.

Explanation:

In this scenario, the reaction force is the Earth pushing up on the man as a response to his downward force on the ground. The correct answer is: O The Earth pushes up on the man.

The reaction force, according to Newton's third law of motion, is a force that occurs as a response to an action force. It is equal in magnitude but opposite in direction to the action force. In the given scenario, the man pushes on the ground to jump up and dunk a basketball. When the man exerts a downward force on the ground, the ground exerts an equal and opposite upward force on the man. This is the reaction force, it allows the man to propel himself upward and achieve the desired jump.

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sir what's the question you have all you wrote is it's not b

The magnitude of this magnetic field would need to be 15.17 tesla in order to exert a force of magnitude 6.16 newtons on a 0.864 meter length of this wire.

The magnitude of this magnetic field can be found by using the equation F = ILBsinθ, where F is the force, I is the current, L is the length of the wire, B is the magnitude of the magnetic field, and θ is the angle between the wire and the magnetic field. Rearranging the equation to solve for B gives us:

B = F / (ILsinθ)

Plugging in the given values gives us:

B = 6.16 N / (0.504 A × 0.864 m × sin(71.7°))

B = 6.16 N / (0.504 A × 0.864 m × 0.944)

B = 15.17 T

Therefore, the magnitude of this magnetic field would need to be 15.17 tesla in order to exert a force of magnitude 6.16 newtons on a 0.864 meter length of this wire.

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Streak is a material property that characterizes particular mineral's coloration.

The mineral is an ingredient or chemical component that has emerged as a result of natural formations and is often crystalline in nature. Examples include the minerals quartz, feldspar, calcite, sulfur, and clays like kaolinite and smectite.

Minerals are necessary building blocks for our daily lives and are fundamental to the advancement of economic, social, and technological systems. For instance, consider the following: Agriculture: Additional mineral products are also utilized to improve soil, including phosphate rock, potash, and lime.

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Answer:

Q = I * t = 2 Coulomb / sec * 1000 sec = 2000 Coulombs transferred

E (energy) = V * Q = I * t * 240 V

E = 240 J / Coul * 2000 Coul = 480,000 Joules

Next question:

Total voltage drop in circuit = 6.5 V + 4.5 V = 11 V

So the power supply must supply 11 V

Answer:

See below

Explanation:

At the rope end where Cliff is :

W = f x d  

    100 N * 18 = 1800 J   of work input

13.)    At the weight end

          work done = f x d

                             = 500 N * 3 m = 1500 J    of work output

Cliff  only got 1500 J of work OUTPUT with 1800 J of work INPUT

    1500 / 1800 = 83.33 efficiency

Answer:

Him

Explanation:

He will push less but more and he will use more energy

The resultant reaction P (Newton) acting on the body is determined as 14.7 N.

Limiting equilibrium means that an object is just on the threshold of motion. In other words, a slight application of force will result in the motion of the body.

The resultant reaction P (Newton) acting on the body is calculated by applying Newton's second law of motion as follows;

∑F = ma

where;

F - Ff = ma

where;

If the body is in equilibrium, the acceleration of the body is zero.

F - Ff = m(0)

F - Ff = 0

F = Ff

F = Ff = 14.7 N

Thus, the resultant reaction acting on the body is a function of the applied force and the direction of the force as shown in the above calculation.

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Answer:

C. it has a high density

Explanation:

i hope it will help

a) Given that the Hill function is (R+a) · (v + b) = b(Ro + a)Here, R = resistance, Ro = maximal resistance, v = cadence, a, b are constantsGiven, maximal resistance, Ro = 75 Newtons,Resistance, R = 0, cadence, v = 180 rpmResistance, R = 10 Newtons, cadence, v = 100 rpmWe have to calculate a and b.For R = 0, v = 180, 10a + 180b = 75b, and b = (10a/−100 + 9/2)For R = 10, v = 100, 20a + 100b = 750 − 75

a.Substitute the value of b in the above equation.20a + 100(10a/−100 + 9/2) = 750 − 75a20a − 10a + 450 = 750 − 75a10a = 300a = 30Substitute the value of a in the equation (10a/−100 + 9/2) = b(10/−100 + 3/2)b = 15/16Therefore, the value of a is 30 and the value of b is 15/16. Hence, we got the value of a and b.b) Here the Hill function is (R+a) · (v + b) = b(Ro + a)Substituting the value of a and b in the equation, we get (R + 30) (v + (15/16)) = (15/16)(75+30)R + 30 = (15/16)105R = (105(v + (15/16)) − 2475)/15R = (7(v + (15/16)) − 165)/15

Therefore, the formula for R as a function of v is given by R = (7(v + (15/16)) − 165)/15.c) Long-term behavior of R is the value of R when v approaches infinity. Thus, the limiting value of R when v approaches infinity is Ro, i.e. 75 Newtons. Thus, the long-term behavior of R is that as the cadence increases, the resistance approaches its maximal value. This behavior is meaningful in the context of a stationary bicycle since maximal resistance represents the level of physical resistance that a cyclist may face.

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\(\boxed{\sf v^2-u^2=2gh}\)

\(\\ \sf\longmapsto h=\dfrac{v^2-u^2}{2g}\)

\(\\ \sf\longmapsto h=\dfrac{0^2-15.5^2}{2(10)}\)

\(\\ \sf\longmapsto h=\dfrac{240.25}{20}\)

\(\\ \sf\longmapsto h=12.012m\)

A neutron star forms when a supergiant explodes. Supergiant stars have the highest mass and luminosity of all-stars in the galaxy.

When a supergiant star runs out of fuel, it will explode as a supernova owing to the loss of a large mass.

When this occurs, other stars in the galaxy will shine and eventually fade away, leaving a black hole or a neutral star in its place.

Hence neutron star forms when a supergiant explodes.

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Answer: D. a neutron star

Explanation: On Edge!!