light ray coming from inside an unknown glass is traveling to air (nair = 1.00) and hits the glass-air interface at an angle of 55° from the interface. Which of the following values is a possible index of refraction of the glass if no light is transmitted in air? O A. 1.22 OB. 1.52 O C. 1.70 O D. 1.85 10

Answer:

Frequency, f = 0.63 Hz

Period, T = 1.58 s

Speed of a wave, v = 1.34 m/s

Explanation:

The equation of a wave is given by :

\(y = 5 \sin (3x - 4t)\) ...(1)

y is in mm

x is in meters

t is in seconds

The general equation of a wave is given by :

\(y=A\sin(kx-\omega t)\) ...(2)

(i) Compare equation (1) and (2) we get :

\(k=3\\\\\omega=4\)

Since,

\(\omega=2\pi f\\\\f=\dfrac{\omega}{2\pi}\\\\f=\dfrac{4}{2\pi}\\\\f=0.63\ Hz\)

(ii) Period of wave is :

\(T=\dfrac{1}{f}\\\\T=\dfrac{1}{0.63}\\\\T=1.58\ s\)

(iii) Speed of a wave,

\(v=\dfrac{\omega}{k}\\\\v=\dfrac{4}{3}\\\\v=1.34\ m/s\)

Answer:

A

Explanation:

Answer:

A. it appears to be reversed left and right

Explanation:

"In a plane mirror, the image will be the same size as the object and will be the same distance behind the mirror as the object is in front of the mirror. This image is called a virtual image because the light does not actually pass through the image."

The magnitude of the acceleration for the objects is 2.07 \(m/s^{2}\).

Acceleration is the rate of change of velocity with respect to time.

Mass of the truck = M1 = 3588 kg

Mass of the Donald Trump’s car = M2 =  821 kg

Total mass = M1 + M2 = M

M = 3588 + 821

M = 4409 kg

Force provided by the truck = 9170 N

As we know Force is the product of mass and acceleration, i.e. F = m*a

therefore a = \(\frac{F}{m}\)

a = \(\frac{9170}{4409}\)

a = 2.07 \(m/s^{2}\)

Both the objects will accelerates with the acceleration of 2.07 \(m/s^{2}\).

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The highlighted vessel  given below in the image attached:

What is the function of the coronary arteries and cardiac veins?

The movement of blood through the blood arteries that nourish the heart muscle is known as coronary circulation (myocardium). The heart muscle receives oxygenated blood from the coronary arteries. After the blood has been deoxygenated, cardiac veins remove it.

The heart muscle receives blood from coronary arteries. The heart muscle need oxygen-rich blood in order to operate, just like all other bodily components do. Blood that lacks oxygen must also be transported away. Outside of the heart, the coronary arteries encircle the organ.

Therefore, Your heart receives blood through the coronary arteries and their branches. In order to pump blood through your heart and the rest of your body, your heart muscles require the oxygen and nutrients found in blood.

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When the distance between two point charges is increased by a factor of 2, the force they exert on each other decreases to 1/4 of the original force. The relation is governed by the Coulomb's Law.

According to Coulomb's Law, the force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. In this scenario, if the distance between the charges is increased by a factor of 2, it means that the new distance is twice the original distance.

Since the force is inversely proportional to the square of the distance, doubling the distance will result in the force becoming 1/4 of the original force. Mathematically, this can be represented as follows:

\(F' = F / (2^2)\)

\(F' = F / 4\)

Therefore, the force between the two charges will become 1/4 (or 25%) of the original force when the distance between them is increased by a factor of 2.

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Answer:

electrons

Explanation:

i think this is right

A 0. 22 kg clay target is fired at an angle of 35° to the horizontal. It reaches a maximum height of 4. 6 m. Its initial speed when it is launched will be u = 16.66 m/s

Projectile motion is the motion of an object thrown (projected) into the air. After the initial force that launches the object, it only experiences the force of gravity. The object is called a projectile, and its path is called its trajectory.

The object's maximum height is the highest vertical position along its trajectory. The horizontal displacement of the projectile is called the range of the projectile. The range of the projectile depends on the object's initial velocity.

h (max) = \(u^{2}\) \(sin^{2}\)(theta) / 2g

given

theta = 35°

Maximum height = 4. 6 m.

u = ?

4.6 = \(u^{2}\) * \(sin^{2}\)(35) / 2*  9.8

  u = 16.66 m/s

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Surgeons can remove brain tumors by using a cavitron ultrasonic surgical aspirator,which produces sound waves of frequency \(23 khz\).The wavelength of these waves in air is \(0.0149 m\) .

Frequency is a measurement of how often something happens over a given period of time. It is usually measured in Hertz (Hz), which is the number of occurrences of a repeating event per second. Frequency is used to measure various phenomena, from sound waves to radio waves, from the movement of particles to the rotation of stars. It is an important concept in physics and other sciences and is used in everyday life to measure events such as the speed of sound and the frequency of a car's engine.

The wavelength of a sound wave is the distance between one wave peak and the next. It is calculated by dividing the speed of sound (in air) by the frequency of the wave. The speed of sound in air is\(343 m/s\), so the wavelength of a wave with a frequency of\(23 kHz\) would be \(343 m/s / 23,000 Hz = 0.0149 m (or 14.9 cm)\).

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Answer:

In order to answer this correctly I will need the answers to the question

Explanation:

I can then work it out and give you the best answer I can give you

Answer:

not enough information need more information to answer the question

The average power generated by the child in that time frame is approximately 20.80 watts with a given force.

To calculate the average power generated by the child, we need to use the following formula:
Power = Work / Time

First, we need to find the work done by the child. Work can be calculated using the formula:
Work = Force × Distance × \(cos(θ)\)

Since the force is applied horizontally and the wagon moves horizontally, the angle \((θ)\) between the force and distance is 0 degrees. Therefore, \(cos(θ) = 1\). Now, we can calculate the work done:

Work = 74.8 N × 38.4 m × 1
Work = 2872.32 J (joules)

Next, we need to convert the time from minutes to seconds:

2.3 minutes × 60 seconds/minute = 138 seconds

Now we can calculate the average power:

Power = Work / Time
Power = 2872.32 J / 138 s
Power ≈ 20.80 W (watts)

So, the average power generated by the child in that time frame is approximately 20.80 watts.

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Answer: The answer to this problem is 3 option

Explanation:

The waves fοrmed by the οcean wοuld cοntain οnly lοngitudinal waves. Thus, option c is correct.

A lοngitudinal wave is a fοrm οf wave in which the medium vibrates parallel tο the wave's directiοn and the displacement οf the medium mοves in the same directiοn as the wave's mοtiοn. Sοund waves are a cοuple οf examples οf lοngitudinal waves. seismic P waves, and ultrasοnic waves.

The wave is referred tο be a lοngitudinal wave when the medium's particles vibrate perpendicular tο the wave's directiοn οf prοpagatiοn.  

Cοmpressiοns and rarefactiοns are created by οscillating sοund waves in a manner similar tο that οf prοpagatiοn directiοn. Hence, lοngitudinal waves are the name given tο sοund waves.

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Answer:

The first one is Earths Tilt on its axis

The time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

The cooling law is given by:

$$\frac{dQ}{dt}=-k(T-T_0)$$

where Q is the heat in the object, t is the time taken, T is the temperature of the object at time t, T0 is the temperature of the environment and k is a constant known as the cooling constant.

We need to find the time it takes for the coffee to reach a drinking temperature of 73°C given that its initial temperature is 93°C.

Therefore, we need to find the time it takes for the coffee to cool down from 93°C to 73°C when placed in a room temperature of 18°C.

Let’s assume that the heat energy that is lost by the coffee is equal to the heat energy gained by the environment. We can express this as:

dQ = - dQ where dQ is the heat energy gained by the environment.

We can substitute dQ with C(T-T0) where C is the specific heat capacity of the object.

We can rearrange the equation as follows:

$$-\frac{dQ}{dt}=k(T-T_0)$$

$$-\frac{d}{dt}C(T-T_0)=k(T-T_0)$$

$$\frac{d}{dt}T=-k(T-T_0)$$

The differential equation above can be solved using separation of variables as follows:

$$\frac{d}{dt}\ln(T-T_0)=-k$$

$$\ln(T-T_0)=-kt+c_1$$

$$T-T_0=e^{-kt+c_1}$$

$$T=T_0+Ce^{-kt}$$

where C = e^(c1).

We can now use the values given to find the specific value of C which is the temperature difference when t=0, that is, the temperature difference between the initial temperature of the coffee and the room temperature.

$$T=T_0+Ce^{-kt}$$

$$73=18+C\cdot e^{-0.09t}$$

$$55=C\cdot e^{-0.09t}$$

$$C=55e^{0.09t}$$

$$T=18+55e^{0.09t}$$

We can now solve for the value of t when T=93 as follows:

$$93=18+55e^{0.09t}$$

$$e^{0.09t}=\frac{93-18}{55}$$

$$e^{0.09t}=1.3636$$

$$t=\frac{\ln(1.3636)}{0.09}$$

Using a calculator, we can find that the time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

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A change in accounting principle refers to a change in the specific method, principle, or basis used to prepare financial statements.

Among the given options, the following would be accounted for as a change in accounting principle:

1. Switching from the cash basis of accounting to the accrual basis of accounting: The cash basis recognizes revenue and expenses when cash is received or paid, while the accrual basis recognizes revenue when earned and expenses when incurred.

2. Changing from FIFO (First-In, First-Out) method to LIFO (Last-In, First-Out) method for inventory valuation: FIFO assumes that the first items purchased are the first ones sold, while LIFO assumes that the last items purchased are the first ones sold.

3. Adopting a new revenue recognition standard: If a company adopts a new revenue recognition standard, such as transitioning from recognizing revenue at the point of sale to recognizing revenue over time, it would be considered a change in accounting principle.

4. Implementing a new depreciation method: If a company changes its depreciation method, such as switching from straight-line depreciation to accelerated depreciation , it would be considered a change in accounting principle.

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The above mentioned question is incomplete. The complete question is:

Which of the following is accounted for as a change in accounting principle?

A. Change in estimates

B. Change in accounting estimate

C. Change in accounting principle

D. Change in reporting entity

One statement that is not true is that UV radiation is a type of electromagnetic radiation. It is also a type of ionizing radiation. UV radiation is actually a form of non-ionizing radiation.

UV radiation, or ultraviolet radiation, is a type of electromagnetic radiation that falls between visible light and X-rays on the electromagnetic spectrum. It is often categorized into three types: UVA, UVB, and UVC. Unlike ionizing radiation, such as X-rays and gamma rays, which have enough energy to remove tightly bound electrons from atoms or molecules, UV radiation lacks the necessary energy to ionize atoms or molecules. Instead, it primarily interacts with the outermost electrons of atoms or molecules, leading to chemical reactions and causing biological effects.

UV radiation is commonly associated with sunlight and has various effects on living organisms and materials. It can cause sunburn, premature aging of the skin, and an increased risk of skin cancer. Exposure to excessive UV radiation can also damage the eyes and impair the immune system. It is important to protect oneself from excessive UV exposure by wearing sunscreen, protective clothing, and sunglasses.

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Answer:

B. 123.96 grams

Explanation:

Answer:

A≈15393.8cm²

Explanation:

Answer:

15,386 cm

Explanation:

A=3.14*70*70

Given that a particle moves along the x-axis so that its acceleration at any time t0 is given by a(t) = 12t - 4, At time t = 1, the velocity of the particle is v(1) = 7, and its position is x(1) = 4.

To find the velocity and position of the particle, we need to integrate the acceleration, a(t), and then solve the resulting equations for the constants of integration.

To solve for C, we use the fact that v(1) = 7:v(1) = 6(1)^2 - 4(1) + Cv(1)

= 2 + C

Thus, C is 5. Now, we can write the velocity of the particle as:

v(t) = 6t^2 - 4t + 5

To find the position of the particle, we integrate the velocity.

v(t) = dx(t)/dt ⇒ dx(t)

= v(t)dt∫dx(t)

= ∫v(t)dtx(t)

= ∫(6t^2 - 4t + 5)dt

X(t) = 2t^3 - 2t^2 + 5t + K

where K is the constant of integration. To solve for K, we use the fact that

x(1) = 4:X(1)

= 2(1)^3 - 2(1)^2 + 5(1) + KX(1)

= 5 + K

Thus, K = -1.

Now, we can write the position of the particle as:

X(t) = 2t^3 - 2t^2 + 5t - 1

Hence, the velocity of the particle is v(t) = 6t2 - 4t + 5, and the position of the particle is X(t) = 2t3 - 2t2 + 5t - 1.

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Answer:

126 V

Explanation:

The computation of the rms voltage is shown below:

=  I × R

=(.2) × (10)

= 2 V voltage drop across capacitor

= I × 1 ÷ (?C)

= I ÷ (2 × pi × f × C)

= (.2) ÷ (2 × pi × 10,000 × 10 × 10^-6)

= .318 V voltage drop across inductor

= I × ?L

= I × 2 × pi × f × L

= .2 × 2 × pi × 10,000 × .010

= 126 V

the magnitude of the initial velocity is 12.50 m/s, and the angle relative to the horizontal is approximately 33.5° To find h, we can reverse the motion and consider the ball's trajectory as if it were going upward.

The time it takes for the ball to reach its highest point and then come back down is twice the time it takes to hit the ground, which is 1.60 s.

Using the kinematic equation:
d = v₀t + (1/2)gt²

Since the initial velocity in the vertical direction (v₀y) is zero when the ball reaches its highest point, we can solve for h:

h = (1/2)gt²
h = (1/2)(9.8 m/s²)(1.60 s)²
h = 12.57 m

(b) To find the magnitude of the initial velocity (v₀), we can use the horizontal distance and time:
d = v₀x * t

Substituting the given values:
20.0 m = v₀ * 1.60 s
v₀ = 12.50 m/s

(c) To find the angle of the initial velocity (θ), we can use the trigonometric relation:
tan(θ) = v₀y / v₀x

Substituting the known values:
tan(θ) = h / d
θ = arctan(h / d)
θ = arctan(12.57 m / 20.0 m)
θ ≈ 33.5°

Therefore, the magnitude of the initial velocity is 12.50 m/s, and the angle relative to the horizontal is approximately 33.5° (above the horizontal).

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The voltage across one of the lamps will be 220V. This is because when components are connected in parallel, the voltage across each component is the same as the voltage across the source.

Voltage is a measure of the potential difference in electrical energy between two points. It is measured in volts and is the electrical force that causes current to flow in an electrical circuit. Voltage is the energy per unit charge that causes a current to flow through a conductor. It can be compared to the pressure of water in a pipe, where the greater the pressure, the more water that can be pushed through the pipe. Voltage is the primary factor in determining the amount of electrical current that can be produced in an electrical circuit. Voltage is also related to the amount of power that can be produced in an electrical circuit. Voltage can be generated by a variety of sources, such as batteries, generators, and rectifiers.

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The lighter block will also accelerate to the right with an acceleration of -0.82 m/s².

(a) μ = 0

The heavier block will accelerate to the right with an acceleration of:

a = F / m = k x / m = (3.70 N/m) (0.0864 m) / 0.261 kg = 1.22 m/s²

The lighter block will also accelerate to the right with an acceleration of 1.22 m/s².

(b) μ = 0.110

The heavier block will accelerate to the right with an acceleration of:

a = F - μk / m = k x / m - μk / m = (3.70 N/m) (0.0864 m) / 0.261 kg - (0.110)(0.261 kg)(9.80 m/s²) = 0.68 m/s²

The lighter block will not accelerate because the force of friction is greater than the force of the spring.

(c) μ = 0.480

The heavier block will accelerate to the right with an acceleration of:

a = F - μk / m = k x / m - μk / m = (3.70 N/m)(0.0864 m) / 0.261 kg - (0.480)(0.261 kg) (9.80 m/s²) = -0.82 m/s²

Therefore, the lighter block will also accelerate to the right with an acceleration of -0.82 m/s².

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Nicolaus Copernicus was the first person to propose the heliocentric model of the solar system, in which the Sun, not the Earth, is at the center.

Copernicus lived during the Renaissance and was an astronomer and mathematician. He proposed his heliocentric model in his book "De Revolutionibus Orbium Coelestium" (On the Revolutions of the Celestial Spheres) published in 1543. In this model, Copernicus argued that the Earth and the other planets revolve around the Sun, and not the other way around as was commonly believed at the time. This challenged the geocentric model of the universe, which placed the Earth at the center.

Copernicus' heliocentric model was based on observations and calculations he made using instruments like the astrolabe and the armillary sphere. He also relied on the work of earlier astronomers like Aristarchus of Samos and Ptolemy. Copernicus' model helped to explain phenomena like retrograde motion and the varying brightness of planets.

Copernicus' heliocentric model was a major shift in the way people thought about the universe, and paved the way for later scientific discoveries. It challenged long-held beliefs and led to a greater understanding of our place in the cosmos. Copernicus' work is considered a cornerstone of modern astronomy.

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Answer:

definition of matter is that matter takes up space and has mass

Answer: Globular clusters with stars more than 13 billion years old contain heavy elements.

Answer:

Servant leaders use persuasion – rather than their authority – to encourage people to take action. They also aim to build consensus in groups , so that everyone supports decisions. There are many tools and models that you can use to be more persuasive, without damaging relationships or taking advantage of others.

Explanation: