The material through which a mechanical wave travels is

Answer:

[tex]25.5^\circ[/tex]

Explanation:

To calculate the angle of refraction you can use Snell's law:

[tex]\text{n}_1*\sin\theta_1 = \text{n}_2*\sin\theta_2[/tex]

With what we have:

[tex]\text{n}_1 =1\\\text{n}_2= 1.33\\sin\theta_1 = 35^\circ\\sin\theta_2=x[/tex]

[tex]\therefore 1 *sin35^\circ =1.33*sin\theta_2\\\\sin\theta_2=\frac{1 *sin35^\circ}{1.33}\\\\\theta_2=\sin^{-1}(\frac{1 *sin35^\circ}{1.33})\\\\\theta_2= 25.5476^\circ\approx 25.5^\circ[/tex]

The angle of refraction of light in water can be calculated using Snell's Law, which compares the angles of incidence and refraction and the refractive indices of the two media. In this case, the angle of refraction is approximately 23 degrees.

The angle of refraction of light can be calculated using Snell's Law which states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the refractive indices of the two media.

In this case, the angle of incidence is 35 degrees, the refractive index of air is 1.00, and the refractive index of water is 1.33.

Using the formula:

sin(angle of incidence) / sin(angle of refraction) = (refractive index of air) / (refractive index of water)

We can solve for the angle of refraction:

sin(35) / sin(angle of refraction) = 1.00 / 1.33

Simplifying the equation, we find that the angle of refraction is approximately 23 degrees.

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B the chicken pox is the infectious agent

Explanation:

Marie Curie's notebooks, as well as all of her belongings, including her clothes, were contaminated with ionizing radiation. In fact, also those of her husband, because this couple of scientists discovered the radioactivity of several elements, helping the advance of science, but did not know about the consequences of dealing with these materials without adequate protection.  

It should be noted that Curie's notes are stored in the basements of the National Library of France, stored in thick lead boxes and those who wish to access these documents must follow the appropriate protocol to treat radioactive material, wear appropriate clothing and sign a responsibility agreement before allowing them to review the documents.

Answer:

[tex]1.6\cdot 10^{-12}N[/tex]

Explanation:

The electric force on a charged particle is given by

[tex]F=qE[/tex]

where

q is the charge of the particle

E is the strength of the electric field

In this problem, we have

[tex]E=1.0\cdot 10^7 N/C[/tex] is the electric field strength

[tex]q=+e=+1.6\cdot 10^{-19}C[/tex] is the charge of the calcium ion

Therefore, the electric force exerted on the calcium ion is

[tex]F=(1.6\cdot 10^{-19}C)(1.0\cdot 10^7 N/C)=1.6\cdot 10^{-12}N[/tex]

Answer:

false

Explanation:

veins carry blood towards the heart after blood passes through the capillaries.

Answer:

False

Explanation:

Veins are vessels that carry  deoxygenated blood back to the heart.

Answer:

They are the same

Explanation:

Electromagnetic waves consist of perpendicular oscillations of electric and magnetic field, which oscillate perpendicularly to the direction of motion of the wave (transverse wave). One property of the electromagnetic waves is that they travel in a vacuum always at the same speed, called speed of light:

[tex]c=3.0\cdot 10^8 m/s[/tex]

Electromagnetic waves are classified into 7 different types according to their frequency; from highest to lowest frequency, we have:

Gamma rays

X-rays

Ultraviolet

Visible light

Infrared

Microwaves

Radio waves

We see that both visible light and gamma rays are electromagnetic waves, so they both travel in a vacuum at the same speed, the speed of light.

the upside down image means an inverted image and for an inverted image, magnification is negative

so the answer is -m

7. It’s just a question of keeping the ratios the same.

Answer:

I believe the answer is A. Voltage

Explanation:

Answer:

[tex]A. Voltage[/tex]

Explanation:

As we know that electric potential is defined as the work done to move a unit charge from one potential to other potential.

Here the unit charge is moved from lower potential to higher potential then in that case the work done to move the charge is stored in the form of potential energy

this is given as

[tex]V = \frac{W}{q}[/tex]

so here we can say that the correct answer for the amount of potential energy for each charge is given as

[tex]A. Voltage[/tex]

Answer:

Transformers are used to increase or decrease the voltage of AC currents

Explanation:

A transformer is a device consisting of two coils (called primary and secondary coil) wrapped at the two sides of a soft iron core. When an AC current is present in the primary coil, it induces a magnetic field inside the core, and the presence of this changing magnetic field induces a voltage (and a current) into the secondary coil.

The voltages in the primary and the secondary coil are related by the transformer equation:

[tex]\frac{V_p}{V_s}=\frac{N_p}{N_s}[/tex]

where

Vp, Vs are the voltages in the primary and secondary coil

Np, Ns are the number of turns in the primary and secondary coil

There are two types of transformers:

- Step-up transformers: these have [tex]N_s > N_p[/tex], so that [tex]V_s > V_p[/tex], which means that they increase the voltage. They are used to increase the voltage of the AC current produced by the power plants, before being sent into the transmission lines.

- Step-down transformers: these have [tex]N_s < N_p[/tex], so that [tex]V_s < V_p[/tex], which means that they decrease the voltage. They are used at the end of the transmission lines, before the houses, in order to decrease the voltage and allow the household appliances to work properly (in fact, household appliances need lower voltages to work)

Answer:

44.7 N

Explanation:

The gravitational force between the objects is given by:

[tex]F=G\frac{mM}{r^2}[/tex]

where

G is the gravitational constant

m and M are the masses of the two objects

r is the distance between the centres of the two objects

In this problem, we have:

[tex]m=5.0 kg[/tex] is the mass of the sphere

[tex]M=5.98\cdot 10^{24} kg[/tex] is the Earth's mass

[tex]R=6370 km[/tex] is the Earth's radius, while h=310 km is the altitude of the sphere, so the distance of the sphere from Earth's centre is

[tex]r=6370 km+310 km=6680 km=6.68\cdot 10^6 m[/tex]

Substituting into the equation, we find

[tex]F=(6.67\cdot 10^{-11})\frac{(5.0 kg)(5.98\cdot 10^{24} kg)}{(6.68\cdot 10^6 m)^2}=44.7 N[/tex]

To calculate the gravitational force on a 5.0 kg sphere inside the space shuttle, you can use the formula F = mg. However, since the sphere is inside the space shuttle and not on the surface of the Earth, you need to calculate the acceleration due to gravity using the formula g = G(M/R^2). Plugging in the values, you can find the gravitational force on the sphere.

The gravitational force on a 5.0 kg sphere inside the space shuttle can be determined using the formula F = mg, where F is the gravitational force, m is the mass of the object, and g is the acceleration due to gravity. In this case, since the sphere is inside the space shuttle and not on the surface of the Earth, the acceleration due to gravity will be different. The acceleration due to gravity is given by g = G(M/R^2), where G is the gravitational constant, M is the mass of the Earth, and R is the distance between the object and the center of the Earth.

Given that the space shuttle orbits 310 km above the surface of the Earth, we need to convert this distance into meters (1 km = 1000 m). So the distance R becomes 310,000 m.

Plugging in the values into the formula, the gravitational force on the sphere inside the space shuttle is:

Using these calculations, you can find the gravitational force on the 5.0 kg sphere inside the space shuttle. Don't forget to include the appropriate units in your answer!

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Answer:

After the colision, the stationary electron's momentum is given as:

P = 2.7328 x 10^(-25) kg m/s

The direction of momentum is the same as the direction of velocity of the electron.

Explanation:

In an Isolated system, when an object moving at some velocity v collides head on with a stationary object of equal mass. There velocities are exchanged.

This means that the first electron will become stationary and the electron which was stationary initially will start moving at a velocity of 3*10^(5)m/s in the same direction as the first electron.

Post collision momentum of the stationary electron:

V = 3 x 10^5 m/s

m = 9.1093 x 10^(-31) kg

Momentum = P = mV =  9.1093 x 10^(-31) x 3 x 10^5

P = 2.7328 x 10^(-25) kg m/s

The direction of momentum is the same as the velocity of the electron.

Answer:

273.279 × 10-25 kg.m/s, in the same direction as the incident electron

Explanation:

The momentum of the stationary electron post collision will be 273.279 × 10-25 kg.m/s, in the same direction as the incident electron.

Momentum of the incident electron = mv

= 9.1093 × 10-31 × 3 × 105

= 273.279 × 10-25 kg.m/s

In the collision of the electrons, the total momentum is conserved. Since it is an elastic collision, the momentum of the incident electron is completely transferred to the stationary electron. So it will have the same momentum as the incident electron. It will also move in the direction of the incident electron.

The Lituya Bay tsunami occurred on July 9th, 1958, northeast of the Gulf of Alaska. It was as a consequence of a strong earthquake of magnitude 8.3 on the Ritchter scale along the Fairweather Fault in the Alaskan Panhandle, which caused a landslide in a fjord in Lituya Bay, collapsing an entire mountain and generating a gigantic wave that rose to 524 meters, the highest recorded so far.

It should be noted that despite its great magnitude and having uprooted all the trees and vegetation of the place, this mega-tsunami claimed only five lives because the area was not as inhabited as the large cities are.

The largest tsunami recorded was the result of the magnitude 9.0 earthquake off Japan's coast in 2011, producing waves over 130 feet high, while the 2004 Indian Ocean earthquake generated a tsunami causing approximately 283,000 fatalities.

The largest tsunami ever recorded occurred on March 11, 2011, following a magnitude 9.0 earthquake off the eastern coast of northern Japan. This earthquake, which is the strongest to ever hit Japan, caused a tsunami with waves that reached heights of more than 130 feet. The massive waves resulted in extensive damage and the loss of life, with over 15,500 fatalities. Another catastrophic event was the Indian Ocean tsunami in 2004, caused by a 9.0 magnitude earthquake that generated waves killing around 283,000 people across 11 countries.

These events illustrate the devastating impact of tsunamis, which are large ocean waves typically triggered by underwater earthquakes or volcanic eruptions. The severity of the damage can be exacerbated in areas with nuclear power plants, as seen in the 2011 Japan tsunami, which knocked out cooling systems and resulted in nuclear meltdowns and radiation exposure.

Answer: it increases

Explanation: .

Answer:

Infrared

Explanation:

Answer:

Infrared

Explanation:

A) Francium-223

In an alpha decay, a nucleus decay emitting an alpha particle, which corresponds to a nucleus of helium: so, it consists of 2 protons and 2 neutrons.

[tex]X \rightarrow X' + \alpha[/tex]

This means that in the decay:

- The original nucleus loses 2 protons --> so its atomic number Z decreases by 2 units

- The original nucleus loses 2 nucleons (2 protons and 2 neutrons) --> so its mass number A decreases by 4 units

In this example, the original nucleus is Ac (Actinium), with

Z = 89

A = 227

After the decay, it must be

Z - 2 = 89 - 2 = 87

A - 4 = 227 - 4 = 223

We see from the periodict table, Z=87 corresponds to Francium (Fr), so the final nucleus will be francium-223 (the isotope of francium with 223 nucleons).

B) Polonium-211

In a beta-minus decay, a neutron in the nucleus turns into a proton, emitting a fast-moving electron (the beta particle) and an anti-neutrino.

[tex]n \rightarrow p + e^- + \bar{\nu}[/tex]

Therefore, in this process:

- The original nucleus gains 1 protons, so its atomic number Z increases by 1 unit

- The original nucleus does not lose/gain nucleons, so its mass number A remains the same

In this example, the original nucleus is Bi (bismuth)-211, with

Z = 83

A = 211

So After the decay, it will be

Z + 1 = 83 + 1 = 84

A = 211

So, the nucleus will be Polonium (Z=84), isotope with 211 nucleons.

C) Neon-22

In a beta-plus decay, a proton in the nucleus turns into a neutron, emitting a fast-moving positron (the beta particle) and a neutrino.

[tex]p \rightarrow n + e^+ +\nu[/tex]

Therefore, in this process:

- The original nucleus loses 1 protons, so its atomic number Z decreases by 1 unit

- The original nucleus does not lose/gain nucleons, so its mass number A remains the same

In this example, the original nucleus is Na (sodium)-22, with

Z = 11

A = 22

So After the decay, it will be

Z - 1 = 11 - 1 = 10

A = 22

So, the nucleus will be Neon (Z=10), isotope with 22 nucleons.

D) Technetium-98

In a gamma decay, an unstable nucleus emits a gamma ray:

[tex]X' \rightarrow X + \gamma[/tex]

In this process, only energy is released (in the form of gamma ray), so there is no gain/loss of protons/neutrons in the process. This means that:

- The atomic number Z remains constant

- The mass number A remains constant

In this example, we have a nucleus of Tc (Technetium)-98, with

Z = 43

A = 98

These numbers will not change during the decay: this means that after the decay, we will still have a nucleus of Technetium-98.

Answer:

6

Explanation:

The rate of change in this scenario corresponds to the number of inches that Ree grows every year. Basically, Ree's height can be written as a linear equation as follows:

[tex]y=mx+q[/tex]

where

x is the number of years after the first birthday

y is the height in inches

q = 27 is the height of Ree on her first birthday

m = 6 is the inches gained by Ree at each birthday

So the equation can also be rewritten as

y = 6x + 27

Answer:

6

Explanation:

1) Temperate Grasslands-Have hot summers and cold winters.

2) Chaparral-A hot coastal biome.

3) Rainforests-A lot of rain, average temperatures, nutrient-poor soil, and have many exotic animals.

4) Aquatic ecosystems-Is an ecosystem in a body of water where many communities of organisms are dependent on each other and their environment.

Answer:

As the can heats, the compressed gases will expand, causing the can to explode

Explanation:

We know that the gases in the aerosol can would assume the shape and volume of the can. The volume of the can would be the volume of the compressed gas.

As heat is added to the can, the aerosol gases would gain kinetic energy and their speed would increase. The gases would begin to expand and would require more space in order to move. This would indirectly increase the pressures between gas molecules and the walls of the can as collisions soars.  

A point would eventually be reached where the gas agitation would lead to an explosion.

Overheated aerosol cans would explode.

Answer:

A.25.096m

B.10m/s

V=22.189m/s

Explanation:

Part A The ball's maximum height above the ground. Part B The ball's speed as it passes the window on its way down. Part C The speed of impact on the ground.

newton's equation of motion

V^2= u^2+2as

a=-g since it is going against gravity

S=h s= distance travelled

h=height

V=final velocity

U=initial velocity

V=o

u=10m/s

0=100+2(-9.81)h

h=100/19.62

h=5.096m

The maximum height above ground level=

Height from thr window to the maximum the ball reached before coming downward+ height from the window to the ground level

H=h+h1

H=5.096+20

25.096m

2.part b

The final velocity as it reach its maximum height upward becomes zero and then the final velocity upward= the initial velocity when coming down

V=U =0

v^2=u^2+2ah

V^2=0+2(9.81)(5.096)

V=9.99917596605

V=10m/s

3. Speed of its impact on the ground

v^2=u^2+2ah

V^2=0+2(9.81)(25.096)

V^2=492.38352

V=22.189m/s

Using the conversion of energy to resolve the questions

Given data :

initial speed of ball = 10 m/s

Distance of ball from ground ( h ) = 20 m

A) Determine the ball's maximum height above ground

we will apply the Newton's motion equation

V² = u² + 2as ------ ( 1 )

where ; u = 0 m/s, v = 0 m/s ,  a = -9.81 m/s² ,   s = ?

Insert values into equation ( 1 )

0 = 100 + 2(-9.81 ) * s

s = 5.1 m

∴ Ball's maximum height ( H ) = s + h = 5.1 + 20 =  25.1 m

B) Determine the Ball's speed as it passes the window on its way down

V² = u² + 2as

where ; V = ? , u = 0 , a = 9.81 m/s² , s = 5.1 m

Hence ; V² = 0 + 2 ( 9.81 ) * 5.1 m

∴ V = 10 m/s

C) Determine the speed of impact on the ground

V² = u² + 2aH

where ; V = ? , u = 0,  a = 9.81 m/s²,   H = 25.1 m

insert values into equation above

V² = 0 + 2( 9.81 ) * 25.1

V = √(0 + 2( 9.81 ) * 25.1 )

    = 22.19 m/s

Hence we can conclude that The ball's maximum height above ground = 25.10 m, The ball's speed on its way down = 10 m/s , The impact speed on the ground = 22.19 m/s.

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The electromagnetic spectrum is the set of electromagnetic radiations distributed in their different frequencies or wavelengths, which in turn are related to their energy.

If we go from the smallest wavelengths known up to now (because according to physics the electromagnetic spectrum is infinite and continuous) to the longest, the electromagnetic spectrum covers the following radiations:

Gamma rays, X-rays, ultraviolet, visible light (all the colors we are able to see), infrared, radio waves and microwaves.

Where those with shorter wavelength (or higher frequency) have more energy than those with a longer wavelength.

The electromagnetic spectrum encompasses all wavelengths and frequencies of electromagnetic radiation, including radio waves and gamma rays.

Electromagnetic spectrum refers to the full range of wavelengths or frequencies of electromagnetic radiation.

The electromagnetic spectrum covers wavelengths from radio waves to gamma rays, including visible light, infrared, and ultraviolet light.

The relationship between frequency and wavelength is key in understanding the electromagnetic spectrum.

Momentum

The momentum of a particle is defined as the product of the particle mass and the particle velocity as follows:

[tex]\overrightarrow{p}=m\overrightarrow{v}[/tex]

On the other hand, the impulse of a constant force is defined as:

[tex]\overrightarrow{J}=\varSigma\overrightarrow{F}(t_{2}-t_{1})=\varSigma\overrightarrow{F}\Delta t[/tex]

We also know that the net force acting on  a particle equals the rate of change  of the particle’s momentum, so:

[tex]\varSigma\overrightarrow{F}=m\overrightarrow{a}=m\frac{d}{dt}(\overrightarrow{v})=\frac{d}{dt}(m\overrightarrow{v})=\frac{d\overrightarrow{p}}{dt}[/tex]

If the force is constant, then [tex]\frac{d\overrightarrow{p}}{dt}[/tex] equals the total change in momentum over a period of time:

[tex]\varSigma\overrightarrow{F}=\frac{\overrightarrow{p_{2}}-\overrightarrow{p_{1}}}{t_{2}-t_{1}} \\ \\ \varSigma\overrightarrow{F}(t_{2}-t_{1})=\overrightarrow{p_{2}}-\overrightarrow{p_{1}} \\ \\ \boxed{\overrightarrow{J}=\Delta \overrightarrow{p}}[/tex]

The impulse experienced by a body is equivalent to its change in momentum. This principle is based on Newton's second law of motion. Impulse is the product of the force and the duration over which it is applied.

The impulse experienced by a body is equivalent to the body’s change in momentum. This principle is based on Newton's second law, which in terms of momentum states that the net force applied to a system equals the rate of change of the momentum that the force causes. In simpler terms, when a force is applied on an object for a certain amount of time, the object experiences an impulse. This impulse is the difference between the initial and final momentum of the object.

For example, consider a ball bouncing off a floor. If the force of the floor on the ball is constant over a specific duration, then the resulting impulse or change in momentum can be calculated by multiplying the force by the duration of the force application. So, an impulse can cause the object's motion to change due to the effect it has on the ball's momentum.

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Answer:

Classification of the Elements. These three groups are: metals, nonmetals, and inert gases.

Explanation:

Answer:If you're referring to Organic Molecules, then they are CARBON, HYDROGEN and OXYGEN.

Explanation:

The medium is the main factor that differentiates a mechanical wave from an electromagnetic wave, since the first can not propagate without its existence, while the second can propagate regardless of whether the medium exists or not.

In addition, it is the medium that will define, the propagation speed of the wave, according to its specific physical characteristics.

Therefore, the correct answer is a.

Adiabatic free expansion, no heat transfers and no work on the system. Adiabatic compression would increase the internal energy of the system. In an adiabatic compression, 200 J of work is done on a gas.

Final answer:

The work done by the system in an adiabatic process where the internal energy decreases by 34,000 J is also -34,000 J.

Explanation:

In an adiabatic process, where no heat is exchanged with the surroundings, the change in internal energy (ΔU) of a system is equal to the work done (W) by the system. Therefore, if the internal energy of a system decreases by 34,000 J, the work done by the system on the surroundings is also -34,000 J (the negative sign indicates that work is done by the system). This is based on the first law of thermodynamics, which in the adiabatic case simplifies to ΔU = W, since the heat transfer (Q) is zero.

Answer:

2) 433 mph

Explanation:

The final velocity of the raindrop as it reaches the ground can be found by using the equation for a uniformly accelerated motion:

[tex]v^2 = u^2 + 2ad[/tex]

where

v is the final velocity

u = 0 is the initial velocity (the raindrop starts from rest)

a = g = 9.8 m/s^2 is the acceleration due to gravity

d = 2 km = 2000 m is the distance covered

Solving for v,

[tex]v=\sqrt{u^2 +2gd}=\sqrt{0^2+2(9.8 m/s^2)(2000)}=198 m/s[/tex]

And keeping in mind that

1 mile = 1609 metres

1 hour = 3600 s

The speed converted into miles per hour is

[tex]v=198 \frac{m}{s}\cdot \frac{3600 s/h}{1609 m/mi}=433 mph[/tex]

Answer:

C. 98 N

Explanation:

The force needed to get the skier at rest moving must be at least equal to the maximum static frictional force acting on the skier, which is given by

[tex]F=\mu W[/tex]

where

[tex]\mu = 0.14[/tex] is the coefficient of static friction

W = 700 N is the weight of the skier

Substituting into the equation, we find

[tex]F=(0.14)(700 N)=98 N[/tex]

Answer:

c

Explanation:

μ = f/N where μ is the coefficient of friction; f is the amount of force that resists motion, and N is the normal force. You must solve for f here so 700 N x .14 = 98 N.

Answer:

A gas expands spontaneously to fill its container.

Explanation:

A gas would always expand spontaneously in any container to fill it up. Gas moves unaided to assume the volume of the space they are put into. Gas molecules are more random and posses more kinetic energy to drive their movements from one place to another. Gases would not require any energy input to make them move.

The volume of a container would then be the same as the volume of the gas that occupies it. Also, when pressure is applied to a gas, the volume reduces considerably according to "Boyle's law".

A homogeneous mixture would have their constituents existing in just one phase. Regardless of any chemical properties of gases, they form homogeneous mixtures.

Answer:

protons and neutrons

Explanation:

4.  A. Increase

The magnitude of the electric force between two charges is given by Coulomb's law:

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

where

k is the Coulomb's constant

q_1 and q_2 are the two charges

r is the separation between the two charges

As we see from the formula, the strength of the electric force is:

- directly proportional to the two charges q1 and q2

- inversely proportional to the square of the distance r

Therefore, we can conclude that:

- if the magnitude of the charges increases, then the magnitude of the force will increases as well

- if the separation between the charges increases, then the magnitude of the force will decrease

5. A. Increase by the same factor

Again, the magnitude of the electric force between the two charges is given by Coulomb's law:

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

we have said that the force F is directly proportional to the two charges q_1 and q_2.

Let's assume now that charge q_1 is increases by a certain factor A. Then the electric force will change as follows:

[tex]F'=k\frac{(A q_1) q_2}{r^2}=A(k\frac{q_1 q_2}{r^2})=A\cdot F[/tex]

so, the magnitude of the electric force has increased by the same factor.

6. A. The electric force would decrease.

This part is similar to part 5, however this time the charge q_1 is decreased.

This means that we can rewrite the new charge q1 as

[tex]q_1 ' = \frac{q_1}{A}[/tex]

where A > 1. Let's see how the electric force changes:

[tex]F'=k\frac{(\frac{q_1}{A}) q_2}{r^2}=\frac{1}{A}(k\frac{q_1 q_2}{r^2})=\frac{F}{A}[/tex]

This means that the magnitude of the electric force has decreased by the same factor.