A ray of light in air is incident on a glass block, the light changes direction. State the name of this effect and the cause of this effect?

The angle between the two forces in the question is 102°.

The angle between two forces can be calculated using the following formula:

F² = F₁² + F₂² + 2F₁F₂cosθ

where F is the magnitude of the resultant force, F₁ and F₂ are the magnitudes of the two forces and θ is the angle between them.

Using this formula, we can calculate the angle between the two forces in question.

Given that two forces of 564 newtons and 466 newtons act on a point and the resultant force is 997 newtons, we can calculate the angle between them as follows:

997²= 564² + 466² + 2 x 564 x 466 x cosθ

cosθ = (997² - 564² - 466²) / (2 x 564 x 466) = -0.186

θ = cos⁻¹(-0.186) = 102 degrees

Therefore, the answer is 102 degrees (rounded to the nearest integer).

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Despite their darkness, their lustrous dark fur coat can make them difficult, if not impossible, to spot. Panthers have small heads, powerful jaws, and emerald green eyes. Their hind legs are often larger and slightly longer than their front legs.

The ability to remain undetected is one of the main ways that panthers differ from other big cats. Panthers hunt at night since they are nocturnal.

Therefore, They can blend in with their surroundings thanks to their dark fur, and their keen eyesight and nose make it easier for them to find their prey.

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The vertical speed of the rod varies inversely as the rotational speed for a given number of complete rotations

The equation that gives the vertical velocity, v₀ is  \(\, \underline{v_0= \dfrac{ g \cdot \pi \cdot n}{ \omega_0 }}\)

Reason:

From a similar question, the given parameters appear to be correctly given as follows;

The vertical speed of the rod = v₀

Angular velocity of the = ω₀

Required;

The value of, v₀, so that the rod has made exactly, n, number of turns when it returns to his hand

Where;

n = An integer

Solution;

The time the rod spends in the air is given as follows;

\(Height, \ h = u \cdot t - \dfrac{1}{2} \cdot g \cdot t^2\)

Where;

g = Acceleration due to gravity

t = Time of motion

When the rod returns to his hand, we have, h = 0, therefore;

\(0 = u \cdot t - \dfrac{1}{2} \cdot g \cdot t^2\)

\(u \cdot t = \dfrac{1}{2} \cdot g \cdot t^2\)

\(t^2 = \dfrac{u \cdot t }{\dfrac{1}{2} \cdot g } = \dfrac{2 \cdot u \cdot t }{g }\)

\(Time, \ t = \dfrac{2 \cdot u }{g }\)

We have;

\(Angular \ velocity, \ \omega_0 = \dfrac{ 2 \cdot \pi \cdot n}{t} \ (required)\)

\(\omega_0 = \dfrac{ 2 \cdot \pi \cdot n}{ \dfrac{2 \cdot v_0 }{g }} = \dfrac{ g \cdot \pi \cdot n}{ v_0 }\)

Therefore;

\(The \ vertical \ velocity, \, \underline{v_0= \dfrac{ g \cdot \pi \cdot n}{ \omega_0 }}\)

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Answer:

The person delivered a power of 2,558 Watt

Explanation:

Work and Power

Mechanical work is the amount of energy transferred by a force. It's a scalar quantity, with SI units of joules.

Being  the force vector and  the displacement vector, the work is calculated as:

\(W=\vec F\cdot \vec s\)

If both the force and displacement are parallel, then we can use the equivalent scalar formula:

W=F.s

Power is the amount of energy transferred per unit of time. In the SI, the unit of power is the watt, equivalent to one joule per second.

The power can be calculated as:

\(\displaystyle P=\frac {W}{t}\)

Where W is the work and t is the time.

If the person lifts a mass of m=200 Kg, then exerts a force equal to its weight:

F = m.g = 200*9.8 = 1,960

F = 1,960 N

The work done when lifting the weight 7 times by a distance of s=2.2 m is:

W = 7*1,960*2.2=30,184

W = 30,184 J

Finally, the power delivered in t=11.8 seconds is:

\(\displaystyle P=\frac {30,184}{11.8}\)

P = 2,558 Watt

The person delivered a power of 2,558 Watt

==> Object A travels for 60 seconds before Object B starts out.

==> Object A moves at 2 m/s.

==> So Object A has a lead of 120 m when Object B starts out.

==> Object B moves at 3 m/s . . . 1 m/s faster than Object A.

==> So Object B catches up on Object A by 1 m every second.

==> Object B closes up Object A's lead of 120 m in 120 seconds.  

Do the data support or refute the hypothesis, normally, the data for the first part of the experiment support the first hypothesis.

Hypothesis testing refers to the formal procedures used by statisticians to accept or reject these hypotheses. When trying to make decisions, it is convenient to formulate assumptions or conjectures about the populations of interest, which consist of considerations about their parameters.

As a result of this, we can see that from the complete text, there is a set of data which is used to show the force that is applied to a cart that causes the acceleration of the cart to increase which supports Newton's second law.

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Answer:

The data support the hypothesis. As the number of half-lives increased, the number of radioactive atoms decreased. With each half-life, approximately half of the radioactive atoms in a sample decayed to a stable isotope.

Explanation:

edge 2022

Answer:

20 meters.

Explanation:

In the graph, the x-axis (the horizontal axis) represents the time, while the y-axis (the vertical axis) represents the distance.

If we want to find the distance covered in the first T seconds, you need to find the value T in the horizontal axis.

Once you find it, we draw a vertical line, in the point where this vertical line touches the graph, we now draw a horizontal line. This horizontal line will intersect the y-axis in a given value. That value is the total distance travelled by the time T.

In this case, we want to find the total distance that David ran in the first 4 seconds.

Then we need to find the value 4 seconds in the horizontal axis. Now we perform the above steps, and we will find that the correspondent y-value is 20.

This means that in the first 4 seconds, David ran a distance of 20 meters.

The color of flames that represents the hottest temperature emitted from a star is (d) Blue.

Blue flames are associated with the highest temperatures. In the context of stars, the color of a star's light is related to its surface temperature. The hottest stars, such as blue supergiants or blue-white stars, emit a significant amount of blue light due to their high temperatures.

As the temperature decreases, stars emit light in different colors, progressing from blue to white, yellow, orange, and finally red, with cooler stars emitting predominantly red light.

Therefore, if we consider the color of flames as an analogy, blue flames would correspond to the hottest temperature emitted from a star.

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Answer: mmm... If you mean most like Basketball it's net ball but i don't know much about Basket ball teams

Explanation:

Distance can be defined as the amount of ground covered (traveled) by a physical object over a specific period of time and speed, regardless of its direction, starting point or ending point.

Mathematically, the distance traveled by a physical object can be calculated by using this formula:

Distance = speed × time

Dimitri's total distance is the sum of the distance he covered by moving from point A to B and then from B to C. Thus, his total distance is given by:

Total distance = AB + BC

Total distance = 18.1 + 13.3

Total distance = 31.4 feet.

The magnitude of Dimitri's displacement would be calculated by finding the difference in the position of the two point-to-point distances as follows:

Displacement = AB - BC

Displacement = 18.1 - 13.3

Displacement = 4.8 feet.

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The frequency of blue light in hertz is d.) 7.5 x 1014.

What is frequency of a light and how is it calculated?

The electromagnetic radiation differs from other radiations through frequency of that wave. Light is one of the forms of electromagnetic radiations. A hertz is said to be the number of oscillations in one second. For a wave, hertz is the number of wavelengths per second. All types of light travels at a same speed irrespective of their frequency.

The equation that relates frequency and wavelength is:

c= fλ

where, c= speed of light

λ = wavelength in meters

f= frequency in hertz

c= 3×10 8 m/s

λ = 4.0 x 10 -7 meters.

f=c/λ

  ⇒3×10 8 /  4.0 x 10 -7

   ⇒7.5 x 1014 Hz.

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Answer:

260 km/h

Explanation:

Motion is said to be relative when the motion observed by the observer depends on the location (frame) of the observer.

When two objects are moving in opposite directions, the relative motion is obtained by subtraction.

Hence  the plane is moving at (285 - 25) km/h giving 260 km/h

Answer:

2.92 m

Explanation:

As we know, frequency × Wavelength = Speed of light

so here frequency of 102.7 MHz can be written as 102.7× 10⁶ Hz..

So Lambda (wavelength) = 3×10⁸/ 102.7 × 10⁶ which gives 2.92 metres or 2.92 × 10¹⁰ Å

Answer:

6.66666 sec/m or 6 2/3 sec/m

Answer:

6.67 meters per second

Explanation:

120/18=6.67 meters per second

Answer:

“The Tyger” represents the evil and beauty too, “the forest of the night” represents unknown challenges, “the blacksmith” represents the creator and “the fearful symmetry” symbolizes the existence of both good and evil. Imagery: Imagery is used to make the readers perceive things with their five senses.

Explanation:

The rate at which the surface area decreases is -960 π m²/sec.

The surface area of a solid object is a measure of the entire vicinity that the floor of the object occupies. the distance occupied by means of a -dimensional flat surface is known as the area. it is measured in square devices. The location occupied through a three-dimensional item by using its outer surface is referred to as the surface place. it is also measured in square units.

The surface area is the full area included via all the faces of a 3D object. as an example, if we want to find the amount of paint required to paint a cube, then the floor on which the paint might be carried out is its surface vicinity. it is continually measured in rectangular units.

calculation:-

Given,

The radius of the sphere decreases at the rate of 6 m/ sec

mean dx/dt = -6

The surface area of the sphere of radius r is = 4πr²

Differentiating with respect to t,

dS/dt = 4π(2r)dx/dt

        = 8πr dx/dt

dS/dt = 8π(20)²(-6)

          = -960 π m²/sec

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Lo que sucede es que la sopa se comienza a enfriar. La temperatura es una función del calor al cual es sometido un cuerpo/sistema.

El calor se refiere a la cantidad de energía térmica que puede ser transferida entre dos sistemas/cuerpos cuando dichos sistemas/cuerpor entran en contacto.

Para que haya transferencia de calor es necesario que ambos objetos se encuentren a diferentes temperaturas.

El calor se define como un tipo de propiedad extensiva porque la modificación en la temperatura de un cuerpo durante la transferencia de calor depende de la cantidad de moléculas presentes en el sistema.

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The statement "real gas molecules have a volume and exert attractive forces on one another." is True.

Real gas molecules possess a volume and interact with each other through attractive forces. Unlike ideal gases, which are assumed to have negligible volume and no intermolecular forces, real gases exhibit deviations from ideal behavior. The finite volume of gas molecules leads to reduced available space for their movement, causing them to occupy a larger volume compared to ideal gas predictions.

The attractive forces between gas molecules, such as van der Waals forces, can cause them to come closer together and deviate from ideal gas behavior. These intermolecular forces become more significant at high pressures and low temperatures, resulting in decreased compressibility and deviations from ideal gas laws.

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140,000 cm of sediment would accumulate in 28,000,000 years. The crust is moving away from the ridge at a rate of approximately 2.142 cm/yr.

To determine the number of years it would take for 140,000 cm of sediment to accumulate at a rate of 0.005 cm/yr, we can use the formula:

Time = Accumulated sediment / Sedimentation rate

Time = 140,000 cm / 0.005 cm/yr = 28,000,000 years

Therefore, 140,000 cm of sediment would accumulate in 28,000,000 years.

For the second part, if the distance of crust displacement from the ridge center is 60,000,000 cm and it took 28,000,000 years for this displacement to occur, we can calculate the rate of crust movement as follows:

Rate = Displacement / Time

Rate = 60,000,000 cm / 28,000,000 years ≈ 2.142 cm/yr

Therefore, the crust is moving away from the ridge at a rate of approximately 2.142 cm/yr.

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the average velocity is given by the change in displacement divided by the change in time: average velocity = (change in displacement) / (change in time) = 8 ft / 1 sec = 8 ft/sec.

To determine the average velocity of the particle over the time interval [1, 2], we need to find the change in displacement and divide it by the change in time.

Given that the displacement function is s(t) = 5t^2 - 7t + 2, we can find the displacement at the endpoints of the interval:

s(1) = 5(1)^2 - 7(1) + 2 = 5 - 7 + 2 = 0

s(2) = 5(2)^2 - 7(2) + 2 = 20 - 14 + 2 = 8

The change in displacement is s(2) - s(1) = 8 - 0 = 8 feet.

The change in time is 2 - 1 = 1 second.

Therefore, the average velocity is given by the change in displacement divided by the change in time:

average velocity = (change in displacement) / (change in time) = 8 ft / 1 sec = 8 ft/sec.

Therefore, the correct answer is 3. average vel. = 8 ft/sec.

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Answer:

Explanation:

306.12 Kg,

Answer:

The mass of an object weighing 3000N is 300kg

Explanation:

Here,

Weight (W) = 3000N is given

So,

we will use

W = mg

where,

m = mass of the body

g = acceleration due to gravity

Now,

W = mg

3000 = m × 10

m = 3000 ÷ 10

m = 300kg

Thus, The mass of an object weighing 3000N is 300kg

-TheUnknownScientist

Answer: Ball #1

Explanation:

Since the platform is more inclined, it will allow the ball to roll down faster.

Answer:

HELIOS- The god of the sun in

HAZMAT-Hazardous materials

NIRSpec- Near Infrared Spectrograph

Explanation:

The acronyms will be:

HAZMAT is an abbreviation for “hazardous material that is the substances in quantities or forms that may pose a reasonable risk to health, property, or the environment.

Near-infrared spectroscopy (NIRS) is a brain imaging method that measures light absorbance to calculate oxy-hemoglobin (oxy-HB) and deoxy-hemoglobin.

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The statement "longer wavelengths are affected more by a prism or water droplets than are the shorter wavelengths." is false.

In reality, shorter wavelengths are affected more by a prism or water droplets than longer wavelengths. This phenomenon is known as dispersion. Dispersion occurs because different wavelengths of light bend at different angles as they pass through a medium, such as a prism or water droplets.

When light enters a prism or encounters water droplets, it undergoes refraction, which is the bending of light as it passes from one medium to another. The degree of refraction depends on the wavelength of light. Shorter wavelengths, such as blue and violet light, are refracted more than longer wavelengths, such as red light.

This differential refraction causes the various wavelengths of light to spread out or separate from each other, resulting in the phenomenon known as dispersion. A prism can separate white light into its constituent colors, creating a rainbow-like effect. Similarly, when sunlight passes through raindrops, it undergoes dispersion, creating a rainbow.

Therefore, it is the shorter wavelengths of light that are more significantly affected by a prism or water droplets, while the longer wavelengths are relatively less affected.

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Explanation:

So,

speed = wavelength x frequency

speed = 2.3 meters x 5 Hz => 11.5 meters per second

Therefore, the speed of the wave is 11.5 meters per second.

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Answer:

Protein makes up approximately 20 percent of the human body and is present in every single cell

Explanation:

Answer:

Protein makes up approximately 20 percent of the human body and is present in every single cell.

The emission of electrons from a metal when it is illuminated by light is known as the photoelectric effect. According to Einstein's photoelectric equation, the energy (E) of a photon of light is equal to the sum of the work function (Φ) of the metal and the kinetic energy (K) of the emitted electron:

E = Φ + K

The energy of a photon of light is related to its wavelength (λ) by the equation:

E = hc/λ

where h is Planck's constant and c is the speed of light.

Since electrons are emitted when the wavelength of the incident light is less than 382 nm, we can use this wavelength to calculate the maximum energy of a photon that can cause electron emission:

E = hc/λ = (6.626 x 10^-34 J s) x (3.00 x 10^8 m/s) / (382 x 10^-9 m) = 5.18 x 10^-19 J

To convert this energy to electron volts (eV), we can divide by the elementary charge (e):

E/e = (5.18 x 10^-19 J) / (1.60 x 10^-19 C/e) = 3.24 eV

Therefore, the work function of the metal is:

Φ = E - K = 3.24 eV - 0 eV = 3.24 eV

So the metal's work function is 3.24 eV.

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Answer:

La ecuación para la velodiad del sonido en aire esta dada por:

\(v = \sqrt{ \frac{\gamma*R*T}{M} }\)

Resolviendo esto para T, obtenemos:

\(T = v^2*(\frac{M}{\gamma*R} )\)

donde:

T = temperatura del aire en grados Kelvin

γ = constante adiabatica = 1.4

R = constante del gas ideal =

M = masa molar del aire = 29*10^(-3) kg/mol

Si sabemos que el primer día la velocidad es 346 m/s, tenemos:

v = 346 m/s

Ahora podemos reemplazar todos esos valores en la ecuación para T, y asi obtener:

\(T = (346m/s)^2*(\frac{29*10^{-3}kg/mol}{1.4* 8.31 J/mol*K} ) = 298.42 K\)

Para el segundo día la velocidad es 340 m/s, entonces ese día la temperatura va a ser:

\(T = (340m/s)^2*(\frac{29*10^{-3}kg/mol}{1.4* 8.31 J/mol*K} ) = 288.16 K\)

The mass's acceleration is proportional to the square of the vertical position y, but this is not necessary to determine in order to conclude that the motion is simple harmonic motion.

Acceleration is the rate of change of an object's velocity. It is a vector quantity, meaning it has both magnitude and direction. Acceleration can be determined by dividing the change in velocity by the amount of time it takes for the change to occur.

The correct explanation about the evidence required to conclude that the mass undergoes simple harmonic motion is that the motion of the mass repeats after a specific time interval, because total mechanical energy is considered to be conserved in simple harmonic motion. The period T of oscillation does depend on the amplitude A of the mass, but this does not directly provide evidence for simple harmonic motion. The net force F exerted on the mass must be directly proportional to the vertical position y in order for the motion to be simple harmonic motion, but it is not necessary to determine this directly during the experiment.

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To simulate gravity in a space station through centrifugal force, the speed of rotation depends on the desired level of artificial gravity and the radius of the rotating part of the station.

The formula to calculate the required rotational speed (ω) is ω = √(g / r), where g is the desired acceleration due to gravity and r is the radius of rotation.

For example, if we want to simulate Earth's gravity (9.8 m/s²) and assume a radius of 100 meters, the rotational speed would be ω = √(9.8 / 100) = 0.99 radians per second.

Converting this to revolutions per minute (rpm), we can multiply by (60 / 2π) to get approximately 9.42 rpm.

Therefore, a space station would need to spin at around 9.42 rpm to simulate Earth's gravity with a radius of 100 meters. The required rotational speed increases as the desired artificial gravity or the radius decreases.

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