What was one of the reasons the media used propaganda in america during wwii? (1 point)
o to motivate people to boycott the war
to motivate people to watch more cartoons
to show the germans as enemies
to show the japanese as our allies

Answer: 12.5m

Explanation:

Given the following :

Flagpole makes 20 complete vibrations in 10 seconds

Velocity (V) of vibration = 25m/s

Find the wavelength of vibration (λ) =?

Frequency is number of complete oscillation per Second

Therefore ;

Frequency (F) = number of oscillations / time taken

F = 20 / 10 = 2Hz

Wavelength = Velocity / frequency

Wavelength = 25 / 2

Wavelength = 12.5m

The refractive index for a transparent medium with a critical angle, c, for light travelling from the medium to air is \(\mu=\frac{1}{\sin \mathrm{iC}}\\\)  =  \(\sin ^{-1}\left(\frac{2}{3}\right) .\end{aligned}$$\)

Refractive index of a transparent medium decreases with increase in wavelength of the incident light used.

The critical angle definition explains a lot about the laws of refraction and how the angle of incidence can be adjusted to bring a 90-degree angle of refraction

Refractive index of glass with respect to air is given:

\($$\mu=\frac{\text { Speed of light in air }}{\text { speed of light in glass }}\\\\=\frac{3 \times 10^8 \mathrm{~m} / \mathrm{s}}{2 \times 10^3 \mathrm{~m} / \mathrm{s}}\\\\=1.5$$\)

Now,

\(\mu=\frac{1}{\sin \mathrm{iC}}\\\\\sin \mathrm{i}_{\mathrm{C}}=\frac{1}{\mu} \\\\& \mathrm{i}_{\mathrm{C}}=\sin ^{-1}\left(\frac{1}{\mu}\right)\\\\=\sin ^{-1}\left(\frac{1}{1.5}\right)\\\\= \sin ^{-1}\left(\frac{2}{3}\right) .\end{aligned}$$\)

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Answer:

Correct Options :

Acceleration on Earth: 1.6 m/s

Mass on the Moon: 100 kg

Better identification of novel species is made possible by categorization.

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Answer: Created Fall 2016 by Ronald Wilson Inductive reasoning uses a set of specific observations to reach an overarching conclusion; it is the opposite of deductive reasoning. So, a few particular premises create a pattern which gives way to a broad idea that is likely true.

Explanation: No explanation lol. But I hope this is helpful!

The longer wavelength is 940 on the AM dial. The wavelength of 940 on the AM dial is approximately 100 times larger than the wavelength of 94 on the FM dial.

To determine the factor by which 940 on the AM dial is larger, we need to calculate the wavelengths for each.

Firstly, convert the frequencies to Hertz:
940 AM is 940 kHz, so multiply by 1,000 to get 940,000 Hz
94 FM is 94 MHz, so multiply by 1,000,000 to get 94,000,000 Hz

Now, calculate the wavelength using the speed of light (c) formula:
c = frequency × wavelength
Wavelength = c / frequency
Speed of light (c) = 299,792,458 m/s

Now, calculate the wavelengths for 940 AM and 94 FM:
940 AM:

Wavelength = 299,792,458 / 940,000 ≈ 319 meters
94 FM:

Wavelength = 299,792,458 / 94,000,000 ≈ 3.19 meters

Lastly, determine the factor by which the wavelength of 940 AM is larger than 94 FM:
Factor = 319 / 3.19 ≈ 100
In conclusion, the wavelength of 940 on the AM dial is approximately 100 times larger than the wavelength of 94 on the FM dial.

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The freezing point of the solution is - 3.53°C, when the concentration of the solute is 8.1 gm and water is 100gm.

The temperature at which a liquid turns into a solid under normal atmospheric pressure is known as the freezing point. A melting point, on the other hand, is the temperature at which a solid turns into a liquid at ordinary atmospheric pressure. The temperature at which solid and liquid phases coexist in equilibrium is a more precise definition of the freezing point. The temperature at which a substance melts (or freezes) at one atmosphere of pressure is known as the normal freezing point.

The amount of solute contained in a specific amount of solution is the substance's concentration. The number of moles of solute in 1 L of solution, or molarity, is used to express concentrations.

The concentration of Solute = 8.1gm and water = 100 gms, α = 0.9

We know that,

ΔTf = i(Kf)m

      = 1 + (n-1)α × 1.86 × 8.1/80 × 100/100

ΔTf = 1.91.861 = 3.53°C.

now, the freezing point of the solution = 0 - 3.53 = -3.53°C.

Hence, the freezing point of the solution is - 3.53°C, when the concentration of the solute is 8.1 gm and water is 100gm.

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The work done by the force on the particle is 39J and  the angle between F and s is 19.7 degree.

An item with mass is pulled or pushed which alters its velocity. A material that has the ability to change a body's rest or motion state is referred to as an external force. It possesses a magnitude and a direction.

Force F = (Fx, Fy)

Displacement S = (Sx,Sy)

Fx=10N

Fy=-1N

Sx=4m

Sy=1m

F=(10,-1)N and S=(4,1)m

Work done is calculated by taking dot product of force and displacement vector:

W=F·S

W=10×4 + (-1)×1

W=40+(-1)=39J

W = 39 J

To find angle between F and s:

\(|F|=\sqrt{10^2+(-1)^2}\)

|F| = √101

|S| = √(4² + 1²)

|S| = √17

W  = |F| |S| cosθ

39 = √101 √17 cosθ

θ = 19.7.

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The statement that is usually not true concerning a sea breeze circulation is: a. They mainly occur at night.

Sea breeze circulations typically occur during the daytime rather than at night. During the day, the land heats up faster than the adjacent body of water, creating a temperature difference. This temperature difference leads to the development of a sea breeze, where cooler air from the water moves towards the warmer land. As a result, options b, c, and d are generally true for a sea breeze circulation.

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Answer:

The correct answer is C. Heat always moves from warm to cool, and cold can not move.

Explanation:

Answer: Different types of fuels have varying compositions and release different amounts of pollutants when burned. Here are some common types of fuels and the pollutants associated with them:

Fossil Fuels:

a. Coal: When burned, coal releases pollutants such as carbon dioxide (CO2), sulfur dioxide (SO2), nitrogen oxides (NOx), and particulate matter (PM).

b. Petroleum (Oil): Burning petroleum-based fuels like gasoline and diesel produces CO2, SO2, NOx, volatile organic compounds (VOCs), and PM.

Natural Gas:

Natural gas, which primarily consists of methane (CH4), is considered a cleaner-burning fuel compared to coal and oil. It releases lower amounts of CO2, SO2, NOx, VOCs, and PM.

Biofuels:

Biofuels are derived from renewable sources such as plants and agricultural waste. Their environmental impact depends on the specific type of biofuel. For example:

a. Ethanol: Produced from crops like corn or sugarcane, burning ethanol emits CO2 but generally releases fewer pollutants than fossil fuels.

b. Biodiesel: Made from vegetable oils or animal fats, biodiesel produces lower levels of CO2, SO2, and PM compared to petroleum-based diesel.

Renewable Energy Sources:

Renewable energy sources like solar, wind, and hydropower do not produce pollutants during electricity generation. However, the manufacturing, installation, and maintenance of renewable energy infrastructure can have environmental impacts.

It's important to note that the environmental impact of a fuel also depends on factors such as combustion technology, fuel efficiency, and emission control measures. Additionally, advancements in clean technologies and the use of emission controls can help mitigate the environmental impact of burning fuels.

Answer:

1. A car moving 40 mph has four times as much kinetic energy as one moving 20 mph, while at 60 mph a car carries nine times as much kinetic energy as at 20 mph. Thus a modest increase in speed can cause a large increase in kinetic energy.

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Answer:

a car moving 40mph has four times as much kinetic energy as one moving 20 mph, while at 60 mph a car carries nine times as much kinetic energy as at 20 mph.

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Answer:

200,000 and 20,000,000

Explanation:

Substituting the values into the equation of momentum, we get that the momentum is p = mv = 20,000*10 = 200,000. Using the equation provided to solve for the force the truck experienced, we find: 20,000*10/0.01 = 20,000,000.

I hope this helps!

Due to the gravitational pull of Earth, large tides were produced when moon was molten and going through chemical differentiation.

So there is a reason why the moon always keeping the same face toward Earth.

The simpler answer is that it rotates on its axis in about the same amount of time as it takes for the moon to orbit the Earth, or about 27 days.

The complex answer is that the gravity of the moon that changes the Earth generates tides that is also called "tidal locking". The moon is being pulled toward us by Earth (creating a rocky bulge) and is now in "synchronous rotation," which means that it spins once for each orbit around Earth due to the constant pull of Earth's gravity.

To sum up, moon rotates slowly and always faces Earth as a result of the friction produced by Earth's gravity.

Image: Explains why moon is always keeping the same face toward earth

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Answer:

c. Light energy to thermal energy

Explanation:

The energy from the sun comes in the form of light energy but is converted to thermal energy.

Answer:

98ms^2

Explanation:

v^2=v1^2+2ad

a^2=(28m/s)^2 +2×a×4.00m

-784=8a

a=98m/s^2

The acceleration of the  diver as she travels through the water ​is - 98 m/s², negative sigh indicates that her speed is deceasing.

Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).

Given parameters:

Initial speed of the board: u = 28 meters per second.

Final speed of the board: v = 0 meters per second.

Distance travelled: s = 4.0 meter.

Let the acceleration of the diver is = a.

Now, from v² = u² + 2as, it can be written that:

0² = 28² + 2a×4

a = - 28²/(2×4)

= - 98 m/s²

Hence, acceleration of the  diver as she travels through the water ​is - 98 m/s², negative sigh indicates that her speed is deceasing.

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The correct answer is Option(C). The proper time between two events is measured by clocks at rest in a reference frame in which the two events are separated by the distance a light signal can travel during the time interval.

The concept of proper time is a fundamental concept in special relativity. It refers to the time interval measured by an observer who is at rest relative to the events being measured. According to special relativity, the passage of time can be affected by relative motion and gravitational fields.

The proper time between two events is independent of the reference frame from which it is measured. It is a fundamental property of the events themselves. In order to measure the proper time between two events, one must use clocks that are at rest relative to the events being measured.

Option (C)  states that the two events are separated by the distance a light signal can travel during the time interval. This is the correct choice because the speed of light is a fundamental constant in special relativity and is the maximum speed at which information can propagate. Using the distance traveled by light during a time interval ensures that the measurement of proper time is consistent with the principles of special relativity.

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

"The proper time between two events is measured by clocks at rest in a reference frame in which the two events:  (A). occur at the same time  (B). occur at the same coordinates  (C). are separated by the distance a light signal can travel during the time interval  (D). occur in Boston  E. satisfy none of the above"--

Answer:

La densidad del tetracloruro de carbono es 1.990 gramos por centímetro cúbico.

Explanation:

La masa de agua contenida dentro de la botella es igual a la diferencia entre la masa pesada totalmente llena y la masa pesada totalmente vacía, es decir:

\(m_{w} = 86.55\,g-24.25\,g\)

\(m_{w} = 62.3\,g\)

Ahora, de acuerdo con la definición de densidad, la masa es directamente proporcional a la densidad, entonces, podemos calcular la densidad del solvente mediante la siguiente relación:

\(\frac{m_{x}}{m_{w}} = \frac{\rho_{x}}{\rho_{w}}\) (1)

Donde:

\(m_{x}\) - Masa del tetracloruro de carbono, en gramos.

\(m_{w}\) - Masa del agua, en gramos.

\(\rho_{x}\) - Densidad del tetracloruro de carbono, en gramos por centímetro cúbico.

\(\rho_{w}\) - Densidad del agua, en gramos por centímetro cúbico.

Si sabemos que \(m_{x} = 123.95\,g\), \(m_{w} = 62.3\,g\) y \(\rho_{w} = 1\,\frac{g}{cm^{3}}\), entonces la densidad del tetracloruro de carbono es:

\(\rho_{x} = \left(\frac{m_{x}}{m_{w}} \right)\cdot \rho_{w}\)

\(\rho_{x} = 1.990\,\frac{g}{cm^{3}}\)

La densidad del tetracloruro de carbono es 1.990 gramos por centímetro cúbico.

Answer:

The combination of cells in which the negative terminal of a first cell is connected with the positive terminal of second cell and the negative terminal of a second cell is connected to the positive terminal of a third cell and so on is known as series combination of cells.

Explanation:

hope this helps to u

Answer:

Battery.

Explanation:

light travel slower in daimond

the answer should be and electric current

The rate of flow of electric charge is Electric Current.

The flow of the electricity in a electrical circuit by calculating the amount of electricity flows in the circuit is known as Electric current. The Electric current can be referred by the symbol 'I'. The unit of electric current is Ampere (A).

Some of the characteristics of Electric current are:

The Electric current can be described by the formula as,

I = V/R ( Ampere)

I - Current (Unit is Ampere)

V- Voltage (Unit is volts)

R- Resistance. (Unit is ohm).

Thus, Electric current is the rate of flow of electric charge.

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Answer:

1.The force required to stop the shopping cart is, F = 12.25 N

Explanation:

Given data,

The mass of the shopping cart, m = 7 kg

The initial velocity of the shopping cart, u = 3.5 m/s

The final velocity of the shopping cart, v = 0 m/s

The time period of acceleration, t = 2 s

The change in momentum of the cart,

                                      p = m(u - v)

                                         = 7 (3.5 - 0)

                                         = 24.5 kg m/s

The force is defined as the rate of change of momentum. To stop the shopping cart, the force required is given by the formula

                                           F = p / t

                                               = 24.5 / 2

                                               = 12.25 N

Hence, the force required to stop the shopping cart is, F = 12.25 N

2.

We have: F = m × v/t

Here, m = 8500 Kg

v = 20 m/s

t = 10 s

Substitute their values into the expression,  

F = 8500 × 20/10

F = 8500 × 2

F = 17000 N

In short, final answer would be 17000 N

Hope this helps!!

Answer:

S = 1/2 a t^2      since intial speed is zero

Vav = 210 m/s / 2 = 105 m/s

t = .7 m / 105 m/s = 6.67E-3 sec    (6.67 * 10^-3 s)

a = 2 S / t^2

a = 2 * .7 / (6.67E-3)^2

a = 31,500 m/s^2

Check:

Ave Speed * time = length of barrel

105 * 6.67E-3 = .70 m

Answer:I can't see the question

Explanation:so i dont konw

Answer:

\(a = 0.83\ m/s^2\)

Explanation:

Uniform Acceleration

When an object changes its velocity at the same rate, the acceleration is constant.

The relation between the initial and final speeds is:

\(v_f=v_o+a.t\)

Where:

vf  = Final speed

vo = Initial speed

a   = Constant acceleration

t   = Elapsed time

It's known a train moves from rest (vo=0) to a speed of vf=25 m/s in t=30 seconds. It's required to calculate the acceleration.

Solving for a:

\(\displaystyle a=\frac{v_f-v_o}{t}\)

Substituting:

\(\displaystyle a=\frac{25-0}{30}\)

\(\boxed{a = 0.83\ m/s^2}\)

Answer:

that the correct one is C

Explanation:

In relative motion problems, in this case the boat and the river, with respect to the land and between them, the most common questions are:

* What is the time to cross the river

* How far down does the boat go

* What direction the boat must have to reach the opposite shore

examining the answers we see that the correct one is C

18 / 6 = 3 hours for 18 miles