When the angle of incidence is equal to the polarizing angle (Theta)p, the reflected ray and the refracted ray are ________ to each other.ParallelPerpendicularZero45o

The radioactive decay equation is \(Th^{232} - > Ra^{228} + He^{4}\). The activity of 10 g of thorium, calculate the initial activity using the decay constant and the number of nuclei.  the activity after 10 years, use the radioactive decay law with the appropriate values.

a) The radioactive decay equation for thorium-232 (\(Th^{232}\)) can be represented as follows:

\(Th^{232} - > Ra^{228} + He^{4}\)

In this equation, thorium-232 decays into radium-228 and emits an alpha particle (helium-4 nucleus). This decay process occurs spontaneously over time.

b) To find the radioactive radiation activity of 10 g of thorium, we need to use the concept of activity, which represents the rate of decay of radioactive material. The activity (A) is given by the equation:

A = λ * N

Where λ is the decay constant and N is the number of radioactive nuclei present. The decay constant is related to the half-life (T1/2) of the isotope by the equation:

λ = ln(2) / T1/2

For thorium-232, with a half-life of 1.4 * \(10^{10}\) years, the decay constant is approximately λ = ln(2) / (1.4 * \(10^{10}\) years).

To find the number of radioactive nuclei (N) in 10 g of thorium, we can use Avogadro's number and the molar mass of thorium-232. The molar mass of thorium-232 is 232 g/mol, so we have:

N = (10 g) / (232 g/mol) * (6.022 * \(10^{23}\)nuclei/mol)

Now, we can calculate the activity (A) by substituting the values into the equation A = λ * N.

c) To find the activity after 10 years, we need to consider the radioactive decay law, which states that the activity of a radioactive substance decreases exponentially over time. The equation for the remaining activity (A_t) after time t is given by:

A_t = A_0 * e^(-λ * t)

Where A_0 is the initial activity at t = 0.

By substituting the appropriate values into the equation, including the initial activity calculated in part b, we can determine the activity after 10 years.

In summary, to find the radioactive radiation activity of thorium-232, we use the decay equation, the concept of activity, and the radioactive decay law. By applying these principles, we can calculate the initial activity of 10 g of thorium and determine the activity after a specified time, such as 10 years.

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The letter moves in Right to left direction.

Observation of the Letter “e” :

PROCEDURE:

1. Cut out a letter “e” and then  place it on slide face up.

2. Add a drop of water on the slide.

3. Place  coverslip on top of “e” and drop of water at 45-degree angle and lower. Draw what is on slide .Figure1.

4. Place slide on stage and view it  in low  power .Centre the “e” in

field of view. Draw what you see in Figure 2.

5. Move the slide to the left ,then move the slide to the right,

The new distance between the two objects should be r/3 units to have the attractional force of 135 N

The gravitational force, which is what pushes mass-containing objects toward one another. We frequently consider the pull of gravity from the Earth. Your body is kept on the ground by this force. However, all mass-bearing objects are pulled toward one another by gravity.

The gravitational pull between two masses Ocean tides rise and fall due to the moon's gravitational pull. of or pertaining to a strong inclination or movement in the direction of something or someone: There has been a lot of research on why they gravitate toward harmful conduct.

Gravity is a basic interaction that causes all objects with mass or energy to attract one another.

Let the masses be M and m kg

The distance is given as'r'

So when the distance is 'r'

GMm/r² = 15

Now when the distance is modified to z

GMm/z² = 135

The ratio of the two

(GMm/z²)/(GMm/r²) = 135/15

⇒r²/z² = 9

⇒z = r/3

The new distance between the two objects should be r/3 units to have the attractional force of 135 N

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When driving at 20 mph on packed snow, you should maintain a following distance of at least Six seconds.

A car will move 45 feet at 20 mph during sight and reaction time.It takes around 19 feet after using the brakes to halt, covering a total length of 64 feet.

Your energy of movement increases three times squared, or six times, as you increase your velocity from 20 mph to 60 mph.Increased traction can be attributed to weather, oil, leaves, loose sand, or gravel.Better traction results from having more tread on the ground.

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The answers for question numbers 3 and 4 is correct. For question number 9, the average speed is 2.5 mi /hr and for question number 10 the speed is 5 yards / s.

We know that,

v = d / t

where,

v = Speed

d = Distance

t = Time

1 ) v = 360 / 6 = 60 km / h

2 ) v = 120 / 3 = 40 mi / h

3 ) v = 18 / 6 = 3 m / s

4 ) v = 1000 / 20 = 50 m / min

5 ) t = 6pm - 5 pm = 1 hr

    v = 2.5 / 1 = 2.5 mi / hr

6 ) v = 1.5 / 0.33 = 4.5 mi / hr ( Since 20 min = 20 / 60 = 0.33 hr )

   d = 4.5 * 1 = 4.5 mi

7 ) d = 20 * 1 = 20 mi ( Since 60 min = 1 hr )

8 ) d = 60 * 2 = 120 mi

9 ) Distance per lap = 0.5 mi

     Total laps = 10

     Total distance = 10 * 0.5 = 5 mi

     v = 5 / 2 = 2.5 mi / hr

10 ) v = 100 / 20 = 5 yards / s

Therefore, the answer for:

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Answer:

The sailboats average speed was 13 mph.

Explanation:

To calculate the speed of the boat first calculate the total ammountof hours it took the boat to get to its destination. Then divide 144 by that number which comes out to 13.

The average speed of the sailboat is determined as 12 miles per hours.

The average speed of an object in motion is obtained by dividing the total distance traveled by the object with the time spent in the entire journey.

v = total distance/total time

where;

v = 144/12

v = 12 mph

Thus, the average speed of the sailboat is determined as 12 miles per hours.

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Answer:

We know that loudness is directly proportional to amplitude and SI unit of amplitude is Decibel So unit of loudness is decibel

Answer:

volume

Explanation:

the si unit of sound is volume

The given amplifier circuit is a common-source amplifier. The equivalent circuit diagram of the amplifier includes a MOSFET N5486 transistor. We can determine the drain current (ID) and drain-source voltage (VDS) using the following equations:

1. Voltage at the source terminal (VS) is calculated using Ohm's law: VS = IS x RS.2. The drain current (ID) can be calculated using the equation ID = IS (1 + GVin), where Vin is the input voltage, G is the voltage gain, and IS is the current flowing through RD.Let's calculate the values of ID and VDS:

Given:- IS = VDD / RD = 10V / 10Ω = 1A- Vin = -1V / (1.5 x 10^6Ω + 0.47μF) = -0.6666667μA (using voltage divider rule)- G = -RD / RS = -10Ω / 3kΩ = -0.003333 Calculating ID:ID = 1A (1 - 0.003333 x 0.6666667 x 10^6)≈ 0.997A = 997mACalculating VDS:VDS = VDD - IDRD= 10V - 997mA x 10Ω≈ 10V - 9.97V≈ 0.03VTherefore, the values of ID and VDS are approximately ID = 997mA and VDS ≈ 0.03V, respectively.

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here is the answers, hope this helps you.

Answer:

Some practical applications for determining the motion of an object are measuring kinetic energy, acceleration, etc.

Explanation:

Answer:

Candle

Explanation:

The moon is an illuminated object, while a candle is a luminous object!

Answer:

Candle

Explanation:

I just took the test

Answer:

Explanation:

Given;

terminal voltage, V = 5.7 V, when the current, I = 0.3 A

terminal voltage, V = 5.1 V, when the current, I = 0.9 A

The emf of the generator is calculated as;

E = V + Ir

where;

E is the emf of the generator

r is the internal resistance

First case:

E = 5.7   + 0.3r -------- (1)

Second case:

E = 5.1 + 0.9r -------- (2)

Since the emf E, is constant in both equations, we will have the following;

5.1 + 0.9r = 5.7   + 0.3r  

collect similar terms together;

0.9r - 0.3r = 5.7 - 5.1

0.6r = 0.6

r = 0.6/0.6

r = 1 Ω

Now, determine the emf of the generator;

E = V + Ir

E = 5.1 + 0.9x1

E = 5.1 + 0.9

E = 6 V

Answer :

The answer is clearly C

Explanation:

Because the only way currents move are to the side

The cosmic horizon is the maximum distance from us through which light from any object has had time to travel since the big bang.

The particle horizon, also known as the cosmological horizon, comoving horizon, or cosmic light horizon, is the furthest a particle's light may have travelled before reaching an observer during the early universe's history. Its distance at the present epoch determines the size of the observable universe since it serves as the boundary between the observable and unobservable areas of the cosmos.

Due to the universe's expansion, it is actually the speed of light multiplied by the conformal time rather than just the age of the universe times the speed of light, as in the Hubble horizon. A cosmic horizon's existence, characteristics, and importance depend on the specific cosmological model.

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The magnetic flux through the circular cross-sectional area of the solenoid is 0.00066 Weber or (Tm²).

A wire tightly twisted in a lengthy, thin coil is a solenoid. Due to its design, the solenoid will have an electromagnet inside of it and a weak magnetic field surrounding it if we pass a current through it.

Equation of solenoid's magnetic field:

By utilizing the convolution operation as well as right hand rule, the magnetic field within a large solenoid is appropriately computed, but all of that can be condensed into:

B = (µ₀ × N × I )/ L

where

B = magnetic field (Tesla)

µ₀ = \(\pi\)× 10^-7 (Tm/A ) is the vacuum permeability,

N = number of turns on solenoid,

I = electric current (Ampere)

L = length of the solenoid (m)

According to the question;

A diameter of solenoid 6.00 cm.

A radius of solenoid is 3 cm = 0.03m

Number of turns = 750

The length of solenoid is 10cm = 0.1m

Substitute all the values in equation to fine mangetic filed.

B = (\(\pi\)×\(10^{-7}\) × 750× 15 )/ 0.1

B = 0.035 Tesla

The formula for magnetic flux is

Ф = B×A

   = B×(\(\pi\)\(r^{2}\))

   = 0.035×\(\pi\)×\(.03^{2}\)

Ф = 0.000099

Ф = 99×\(10^{-6}\) Weber

Therefore, the magnetic flux through the circular cross-sectional area of the solenoid. is 99×\(10^{-6}\) Weber.

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The true statements about magnetic fields and forces will be A,D and E.

An iron piece,alloy, or other substance with its constituent atoms arranged in such a way that it shows magnetism qualities,

The function of the magnet is attracting other iron-containing objects or aligning itself in a magnetic field.

There are two poles of the magnet;

1. North Pole.

2. South Pole.

The same poles repel each other, while the opposite poles attract each other. In a sense, south-south and north-north repel. While the north-south and the south-north attract each other.

The correct statements are;

(A). The north pole attracts the south pole of a magnet.

(D)Forces caused by magnetic fields are weaker farther from the magnet.

(E)Magnetic forces can act on an object even if the object isn't touching the magnet.

Hence, the true statements about magnetic fields and forces will be A,D and E.

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Work on a car, to increase its kinetic energy. The net work required to accelerate the 1000 kg car from 20 m/s to 30 m/s is 250,000 Joules.

To calculate the net work required to accelerate a car, we can use the work-energy principle. The net work done on an object is equal to the change in its kinetic energy.

Given:

Mass of the car (m) = 1000 kg

Initial velocity (v1) = 20 m/s

Final velocity (v2) = 30 m/s

The change in kinetic energy (ΔKE) can be calculated using the formula:

ΔKE = (1/2) * m * (\(v2^{2}\) - \(v1^{2}\))

Substituting the given values:

ΔKE = (1/2) * 1000 kg * (\((30 m/s)^{2}\) - \((20 m/s)^{2}\))

ΔKE = (1/2) * 1000 kg * (900 \(m^{2}\)/\(s^{2}\) - 400 \(m^{2}\)/\(s^{2}\))

ΔKE = (1/2) * 1000 kg * 500 \(m^{2}\)/\(s^{2}\)

ΔKE = 250,000 J

The net work (W) required to accelerate the car is equal to the change in kinetic energy:

W = ΔKE = 250,000 J

Therefore, the net work required to accelerate the 1000 kg car from 20 m/s to 30 m/s is 250,000 Joules.

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Common voltage values for motor starter coils (in volts AC) are 24, 120, 208, 240, 277, 480, and 560.

These specific voltage values are commonly utilized in motor control systems for various applications. The selection of the appropriate voltage rating for a motor starter coil is crucial to ensure compatibility and reliable operation. Factors such as the power rating of the motor, electrical system requirements, and industry standards influence the choice of voltage. Using the correct voltage rating helps maintain the integrity of the motor control system, prevents potential electrical issues, and promotes safe and efficient motor performance. Therefore, it is important to consider these standard voltage values when selecting motor starter coils for different applications.

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A radio wave travels at the speed of light, which is equal to approximately 300,000 km/s.

So, to travel a distance of 998.25 km, the time needed is:

Therefore the time required is approximately 3327.5 microseconds.

In this case, the velocity of block A is 6 m/s (upward direction).

To determine the velocity of block A when end B of the rope is pulled down with a speed of 6 m/s, we will use the principle of pulley systems.

Assuming that the system consists of a single fixed pulley:

When end B of the rope is pulled down, the rope around the pulley moves in the same direction with the same speed.

Therefore, block A will move upward with a velocity equal to the speed at which end B is pulled down.

So, block A has 6 m/s of velocity (upward direction).

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A. The two new animal populations adapt gradually and separately to their new environments on either side of the mountain. This options explains how does the creation of a new mountain range in an ecosystem affect an animal population.

Explain the role of mountain range in an ecosystem?

When a new mountain range is created, it can act as a barrier that separates animal populations on either side. Over time, the two populations will adapt to their new environments, which may be different due to differences in climate, vegetation, or other factors.

As a result, the two populations may evolve independently of each other, leading to differences in behavior, appearance, and genetic makeup. This process is known as allopatric speciation. It is important to note that while the two populations may become distinct, they may still be able to interbreed if they come into contact again in the future.

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Answer: Controlar el sobrepeso bajas grasa , te pone de buen homor , te da mas energia , Te ayuda mantenerte saludable y combatir enfermedades.

Answer:

The Average kinetic Energy of all the atoms and molecules of substance

Explanation:

Complete question is;

Selena drew a diagram to show how current moves in a loop of wire that is placed between two magnets. At top left a piece of magnet labeled N and at top right a piece labeled S. Between these a square coil of wire with green arrows at its ends away from the magnets pointing away from the magnets. Red arrows point from N to S. Which best explains how Selena can correct her error?

A) She can change the magnets so like poles are facing each other.

B) She can change the arrows so they show current traveling in opposite directions on the sides of the loop.

C) She can change the arrows so they show the magnetic field reversing direction between the magnets.

D) She can change the magnetic poles so they are both on one side of the loop.

Answer:

B) She can change the arrows so they show current traveling in opposite directions on the sides of the loop.

Explanation:

Since the direction of the arrows point north and south whereas the magnets are east and west, it means the arrows are not pointing in the correct direction. To correct it she will have to make sure the arrows are pointing in opposite directions of the magnet via the sides of the loop.

Answer:

The answer is B

Explanation: Good luck on the test!

Answer:

ofc it is D because the distance is far and the plane is the fastest.

Explanation:

Answer:

The answer is A

Explanation:

Most postal company hany ships with large amounts of mail because it is the cheapest way to send mail.

The kinetic energy of the truck is 44,287,500 J as per the given data.

The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it.

The kinetic energy (K) of an object can be calculated using the formula:

\(K = 0.5 Xm X v^2\)

Where,

m = mass of the object

v = velocity

Plugging in the values given in the question, we have:

\(K = 0.5 X 2900 X (55 m/s)^2\)

\(K = 0.5 X 2900 X 3025 m^2/s^2\)

K = 44,287,500 J (joules)

So, the kinetic energy of the truck is 44,287,500 J.

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Answer:

3.

Force(f) =2000N

Distance (d) =10m

Time(t)=50 sec

We know,

P=W/t

=f×d/t

=2000×10/50

=400 watt

4.

Force(f) =30N

Distance (d) =10 m

Time(t) =5 sec

We know,

P=w/t

=f×d/t

=30×10/5

=60 watt

A car drives over the top of a hill that has a radius of 30 m. Maximum speed can the car have without flying off the road at the top of the hill is 17.14 m/s

The given parameters;

radius of the hill, r = 30 m

The centripetal force must be equal to or greater than the car's weight to determine the maximum speed of the vehicle on a hill.

F=mg

mv²/r = mg

v=√rg

v=√30*9.8

v=17.14 m/s

In contrast to velocity, which describes the speed and direction of an object's movement, speed is the rate of movement along a path. Alternatively, velocity is a vector and speed is a scalar quantity. No speed can be negative or zero. velocity can be zero or negative. What moves quickly is referred to as speed. With a direction comes velocity.

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Answer:

x is approximately 95.495

Explanation:

The given information are;

One lunar month = 30 days

The measured time between the first and third quarters = 14.9 days

Therefore, the angle of rotation for 30 days = 360°

The angle of rotation for 14.9 days = 14.9×360/30 = 178.8°

Therefore, whereby 2·θ = 178.8°

θ = 178.8°/2 = 89.4°

Therefore, given that the angle at the tangent from Sun to the Moon = 90°, we have;

The angle between the line from the Sun to the Moon = 90° - 89.4° = 0.6°

From sine rule, we have;

1/(sin 0.6) = x/(sin 90°)

x = (sin 90°)/(sin 0.6°) ≈ 95.495

x = 95.495.