Why salt is a pure substance and salt solution is considered to be a mixture

Answer:

the required tension is 4.57 N.

Explanation:

Given;

first velocity of the wave, v₁ = 24 m/s

first tension on the string, T₁ = 5.34 N

second velocity of the wave, v₂ = 22.2 m/s

second tension of the string, T₂ = ?

\(v = \sqrt{\frac{T}{\mu} }\)

where;

μ is mass per unit length

\(v^2 =\frac{T}{\mu} \\\\\mu = \frac{T}{v^2} = \frac{T_1}{v_1^2} = \frac{T_2}{v_2^2} \\\\T_2 =\frac{T_1v_2^2}{v_1^2} \\\\T_2 = \frac{5.34 \times 22.2^2}{24^2} \\\\T_2 = 4.57 \ N\)

Therefore, the required tension is 4.57 N.

We can use Faraday's equation of electromagnetic induction, which states that the induced electric field is equal to the rate of change of the magnetic flux, to determine the strength of the electric field within the solenoid at a point on the axis. To determine the electric field strength, use the following formula:

E = D(BA) / dt

Where:

E is the intensity of the electric field

The magnetic field intensity is B.

A is the region parallel to the magnetic field, and t is the time.

Given:

Diameter of the solenoid = 5.0 cm

Radius of the solenoid (r) = 2.5 cm = 0.025 m

Magnetic field strength (B) = 2.0 T

Rate of change of magnetic field (dB/dt) = -4.50 T/s

To calculate the area (A) perpendicular to the magnetic field, we can use the formula:

A = πr^2

A = π(0.025 m)^2

A = 0.00196 m^2

We can now enter the values into the formula as follows:

E = d(BA)/dt.

E = -(-4.50 T/s)(0.00196 m^2)/s

E = 8.82 V/m

Therefore, the electric field intensity at any point on the axis inside the solenoid is 8.82 V/m.

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Answer:

High ceilings make a room feel large and open, but they can be difficult to cool and heat. Because hot air rises, the challenge becomes trying to keep the hot air where you want it and preventing if from being wasted where you don't.

Explanation:

:)

Answer:High ceilings make a room feel large and open, but they can be difficult to cool and heat. Because hot air rises, the challenge becomes trying to keep the hot air where you want it and preventing if from being wasted where you don't

Explanation:

Answer:

please find attached pdf

Explanation:

A black hole is: (d) an object so dense that light leaving it is bent totally back to the object. A black hole is a region in space where gravity is extremely strong, and nothing, including light, can escape its gravitational pull.

Black holes are formed from the remnants of massive stars that have undergone gravitational collapse. When a star exhausts its nuclear fuel, its core collapses under its own gravity. If the core's mass exceeds a certain threshold known as the Chandrasekhar limit, the collapse continues until it forms a black hole.

The extreme density of a black hole results in a gravitational field so intense that it warps the fabric of spacetime around it. This bending of spacetime causes light and other electromagnetic radiation to follow curved paths, and if they come close enough, they can be trapped by the intense gravitational pull of the black hole, unable to escape.

Hence, light leaving a black hole is bent back toward the object, making it impossible for any light to be emitted or seen from within the event horizon, the boundary beyond which nothing can escape the black hole's gravity.

Therefore, (d) an object so dense that light leaving it is bent totally back to the object is correct answer.

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To indicate the direction of the force exerted by the water on the inside of the fishbowl at points A and B, the vector will be pointing downwards as gravity pulls the water downwards.

For the force exerted by the water on the outside of the goldfish at points C, D, and E, the vectors will be pointing upwards as the water pushes against the goldfish from all sides. The angles of the vectors will depend on the orientation of the points on the fishbowl or goldfish.

The force exerted by the water on the fishbowl or goldfish is due to the pressure exerted by the water on the surfaces. At points A and B, the water exerts a force on the inside of the fishbowl due to gravity pulling the water downwards. This force will be perpendicular to the surface of the fishbowl and will be pointing downwards.

At points C, D, and E, the water exerts a force on the outside of the goldfish due to the pressure of the water pushing against the goldfish from all sides. The direction of this force will be perpendicular to the surface of the goldfish and will be pointing upwards.

The angles of the vectors will depend on the orientation of the points on the fishbowl or goldfish. Overall, the direction and magnitude of the forces exerted by the water are important for understanding the dynamics of the system.

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An estimate of how much energy per year is needed for 1 gigawatt is approximately 31,536,000,000,000,000 joules (J) per year.

To estimate how much energy per year is needed for 1 gigawatt, we need to consider the unit of measurement for energy, which is joules (J).

A gigawatt is equivalent to 1 billion watts or 1,000,000,000 watts. To calculate the energy per year, we need to multiply this value by the number of seconds in a year.

There are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, and 365 days in a year.

So, 1 gigawatt x 1 year = 1,000,000,000 watts x 60 seconds/min x 60 minutes/hour x 24 hours/day x 365 days/year

= 31,536,000,000,000,000 joules (J) per year

Therefore, approximately 31,536,000,000,000,000 joules (J) per year  is an estimate of energy needed for 1 gigawatt.

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The tension on the rope must be equal to the weight of the objects that are attached

The tension force is the force that acts on the rope a it is attached to a point in order to hold a mass in place. The tension force is responsible for the tautness of the rope.

As such the tension on the rope must be equal to the weight of the objects that are attached thus; T=w=mg.

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Answer:

2 and one-third, negative 4 and three-fourths

Step-by-step explanation:

the solution is the point at which the system of equations are equal to each other, meaning where they intersect

(a) The gravitational force received by each 1 kg mass is 8.66 N.

(b) The magnitude of gravitational acceleration is 8.66 m/s².

(c) The orbital speed of the ISS is  7,663.6 m/s.

(d) The time take  for the ISS to orbit round the Earth is 5,558.75 seconds which is equal to 1.54 hours.

The gravitational force received by each 1 kg mass is calculated as follows;

F = Gm₁m₂/r²

where;

F = (6.67 x 10⁻¹¹ x 5.97 x 10²⁴ x 1) / (6780,000)²

F = 8.66 N

mg = GMm/r²

g = GM/r²

where;

g = (6.67 x 10⁻¹¹ x 5.97 x 10²⁴ ) / (6780,000)²

g = 8.66 m/s²

v = √GM/r

v = √(6.67 x 10⁻¹¹ x 5.97 x 10²⁴  / 6780,000)

v = 7,663.6 m/s

T = 2πr/v

T = (2π x 6780,000) / (7663.6)

T = 5,558.75 seconds

1 hour = 3600 seconds

=  5,558.75/3600

= 1.54 hours

Thus, the gravitational force received by each 1 kg mass is 8.66 N.

The magnitude of gravitational acceleration is 8.66 m/s².

The orbital speed of the ISS is  7,663.6 m/s.

The time take  for the ISS to orbit round the Earth is 5,558.75 s = 1.54 hours.

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Answer:

I think is B. sound, nuclear, electrical

but if I wrong then I am so sorry

Answer:

The smallest part of a chemical compound that has all the properties of that compound is a molecule. A molecule is made up of two or more atoms that are chemically bonded together. Molecules can be made up of atoms of the same element, such as O2 (oxygen gas), or they can be made up of different elements, such as H2O (water). Each molecule has its own unique properties, which are determined by the types of atoms in the molecule and the way they are bonded together.

The Tip Speed Ratio (TSR) is the ratio of the speed of the wind turbine blade to the wind speed. It is defined as the speed of the blade tips divided by the wind speed and is represented by λ.

The Tip speed ratio is defined as the ratio of the wind speed at the tips of the turbine blades to the wind speed. The ratio is used to compare the performance of various wind turbines. The performance of the wind turbine is directly related to the tip speed ratio. This ratio is important as it helps in determining the amount of energy that can be harvested from the wind.

It is also important because it is used to measure the efficiency of a wind turbine. The higher the tip speed ratio, the more efficient the turbine is in capturing the energy from the wind.b) The operation of the wind turbine is optimized when the tip speed ratio changes. The tip speed ratio can be changed by altering the rotational speed of the blades, the length of the blades, or the wind speed. When the tip speed ratio is optimized, the wind turbine can operate at its maximum efficiency.

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A cyclist starts pedalling his bicycle from rest and achieves an angular speed of 5 revolutions in 8 seconds. Afterwards, he stops pedalling and lets the bicycle move slowly before coming to a complete stop in 12 seconds. The wheels complete approximately 8.75 revolutions in total during the entire motion.

To determine the total number of revolutions of the wheels, we need to consider both periods: acceleration and deceleration.
During the acceleration phase (0 to 8 seconds), the cyclist completes 5 revolutions. Now we need to calculate the number of revolutions during the deceleration phase (8 to 20 seconds).
Assuming uniform deceleration, the angular speed decreases linearly from 5 revolutions in 8 seconds to 0 revolutions in 12 seconds. The average angular speed during the deceleration phase can be calculated as (5 + 0) / 2 = 2.5 revolutions per 8 seconds.
Now, to find the number of revolutions in the 12-second deceleration period, we can use the proportion:
2.5 revolutions / 8 seconds = x revolutions / 12 seconds
Solving for x, we get:
x = (2.5 * 12) / 8 = 3.75 revolutions
Adding the revolutions during both phases, we get the total number of revolutions of the wheels:
5 revolutions (acceleration) + 3.75 revolutions (deceleration) = 8.75 revolutions

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Answer:

Solar panels have increased in efficiency over the past 20 years

Explanation:

Because if efficiency have increased other technologies will be discovered

Answer:

Solar panels have increased in efficiency over the past 20 years

Explanation:

Answer:

b

Explanation:

If someone showed you two spheres of the same size but with different masses, say 1g and 10kg, and asked which would hit the ground first after being dropped from the Leaning Tower of Pisa, what would you say? If you’re like most people, you would say the 10kg sphere would hit the ground first. Aristotle said so too, and for 1,000 years everyone believed him. But doing the experiment would show you, besides a great view of Pisa, that in fact, both spheres hit the ground at the same time.This is exactly what Galileo did, showing the world that objects of different masses fall at the same rate. (This is also a good example of why it is important to do experiments yourself and not to just take someone else’s word for it.) To start understanding why Galileo was right, we need to understand the difference between several physics words that are often jumbled together and confused: mass, weight, speed, velocity, acceleration, and force.

Answer: Pluto and Eris

Answer:

ceres

Explanation:

(a) The average sound power (in W) incident on an eardrum at the threshold of pain, which corresponds to an intensity of 1.00 W/m is 5.08 X 10⁻⁵ W

(b) The amount of energy (in J) is transferred to the eardrum exposed to this sound for 2.10 min is 6.40 X 10⁻³ J.

To calculate the average sound power (in W) incident on an eardrum at the threshold of pain, we need to use the formula:

I = P / A

where I is the intensity of sound, P is the power, and A is the area.

At the threshold of pain, I = 1.00 W/m² and A = 5.08 X 10⁻⁵ m².

Rearranging the formula gives:

P = I x A = (1.00 W/²) x (5.08 X 10⁻⁵ m²) = 5.08 X 10⁻⁵ W

Therefore, the average sound power incident on an eardrum at the threshold of pain is 5.08 X 10⁻⁵ W.

To calculate the amount of energy (in J) transferred to the eardrum exposed to this sound for 2.10 min, we need to use the formula:

E = P x t

where E is the energy, P is the power, and t is the time.

From part (a), we know that P = 5.08 X 10⁻ W.

Converting 2.10 min to seconds gives:

t = 2.10 min x 60 s/min = 126 s

Substituting the values into the formula gives:

E = (5.08 X 10⁻⁵ W) x (126 s) = 6.40 X 10⁻³ J

Therefore, the amount of energy transferred to the eardrum exposed to this sound for 2.10 min is 6.40 X 10⁻³ J.

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Answer:

154 N horizontal (to the right) 15.9 N vertical (up)

Explanation:

I got it right :)

The sequence for de broglie wavelengths from largest to smallest is electron > proton > helium.

de broglie wavelength is an important concept to study various phenomenon in quantum mechanics.

Where, h is the Plank's constant

m is the mass of the particle

v is the velocity of particle.

mass of proton = mp = 1.6 x \(10^{-27}\) kg

mass of electron, me = 9.1 x  \(10^{-31}\) kg

mass of helium nucleus, mHe = 6.6 x  \(10^{-27}\) kg

As the velocity of all the three elements are same as v.

According to the de Broglie wavelength formula, since v is same for all λ is inversely proportional to the mass of the element.

Lesser  the mass more will be the de broglie wavelength.

Here, mass of electron < mass of proton < mass of helium nucleus.

So, de broglie wavelength of electron > de broglie wavelength of proton > de broglie wavelength of helium nucleus.

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Answer:

allows no light to pass

Explanation:

The correct answer is forces are equal but opposite in direction between car and bus.

What do we mean by Collision?

When two objects collide, forces of equal magnitude and opposite direction are applied to each object. Such pressures frequently result in one thing gaining momentum and gaining speed while the other object slows down (lose momentum).

The force applied to an object to cause an impact—a change in momentum—on it is referred to as the impact force, or momentum. Technically speaking, the Car and the bus would have exerted and felt the same amount of impact force in the event of a collision. Because every action has a corresponding and opposing response, according to Newton's third law.

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Answer: A) The speed of the zero-momentum reference frame is zero.

B)speed of zero-momentum reference frame = v

Explanation: A. In the Earth reference frame, the two identical cars approach each other with equal and opposite momenta. Therefore, the total momentum of the system is zero. The speed of the zero-momentum reference frame can be found by dividing the total momentum by the total mass of the system, which is equal to twice the mass of each car. Since the cars are identical, we can express this as:

speed of zero-momentum reference frame = total momentum / (2 x mass of each car)

The momentum of each car can be calculated as:

momentum = mass x velocity

Since both cars are traveling at the same speed v but in opposite directions, the momenta are equal and opposite, and they cancel each other out. Therefore, the total momentum of the system is zero.

So we have:

speed of zero-momentum reference frame = 0 / (2 x mass of each car) = 0

Therefore, the speed of the zero-momentum reference frame is zero.

B. In the Earth reference frame, the two identical cars traveling in the same direction have the same momentum. Therefore, the total momentum of the system is twice the momentum of each car. The speed of the zero-momentum reference frame can be found by dividing the total momentum by the total mass of the system, which is equal to twice the mass of each car. Since the cars are identical, we can express this as:

speed of zero-momentum reference frame = total momentum / (2 x mass of each car)

The momentum of each car can be calculated as:

momentum = mass x velocity

Since both cars are traveling at the same speed v, the momenta are equal and add up. Therefore, the total momentum of the system is:

total momentum = 2 x (mass of each car) x (velocity of each car)

Substituting the values we were given, we get:

total momentum = 2 x (mass of each car) x v

So we have:

speed of zero-momentum reference frame = [2 x (mass of each car) x v] / (2 x mass of each car)

The mass of each car cancels out, and we are left with:

speed of zero-momentum reference frame = v

Therefore, the speed of the zero-momentum reference frame is equal to the speed of the cars, which is v.

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Answer:

electric stuff

Explanation:

I didn't see any option choices so srry

1 ) The expression that gives the time it takes for the child to go around once is: t = 2π(d/2)/v .

2 ) Option (C) 306 N , is the correct answer.

1 . To determine the time it takes for the child to go around once, we need to consider the relationship between the circumference of a circle and the speed of the child.

The circumference of a circle with diameter d is given by C = πd. In this case, the child is riding at the edge of the merry-go-round, so the distance traveled in one complete revolution is equal to the circumference.

The child is moving with a constant speed v, so the time it takes to complete one revolution is the distance traveled divided by the speed, which can be expressed as:

t = C/v

Substituting the value of C, we have:

t = πd/v

Since the diameter is twice the radius, we can rewrite the equation as:

t = π(d/2)/v

Simplifying further, we get:

t = 2π(d/2)/v

2. To determine what the scale reads, we need to consider the forces acting on Mark in the elevator. There are two forces involved: the gravitational force and the normal force exerted by the scale.

The gravitational force acting on Mark is given by the equation F_gravity = mg, where m is Mark's mass and g is the acceleration due to gravity, which is 9.80 m/s².

The normal force exerted by the scale is the force the scale exerts on Mark to support his weight. In this case, since the elevator is accelerating downward, the normal force will be less than the gravitational force.

Using Newton's second law, we can write the equation of motion for Mark in the vertical direction:

F_net = F_gravity - F_normal

= ma

Substituting the given acceleration as 2g/5, we have:

mg - F_normal = m(2g/5)

Simplifying, we find F_normal = 3mg/5.

Therefore, the scale reads the value of the normal force, which is 3/5 times Mark's weight:

F_scale = 3/5 * mg

Substituting the mass of Mark as 52.0 kg, we have:

F_scale = 3/5 * 52.0 kg * 9.8 m/s²

Calculating the value, we find:

F_scale ≈ 306 N

The expression that gives the time it takes for the child to go around once is t = 2π(d/2)/v, where d is the diameter of the merry-go-round and v is the constant speed of the child. This formula allows us to calculate the time based on the given parameters and provides a mathematical understanding of the relationship between the distance traveled and the speed of the child.

The scale in the elevator reads approximately 306 N. This value is obtained by calculating the normal force exerted by the scale, which is 3/5 times the weight of Mark. It is important to consider the acceleration of the elevator and its impact on the forces acting on Mark. By applying Newton's second law, we can determine the relationship between the gravitational force and the normal force, which allows us to find the reading on the scale.

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Answer:

C. Radioactive decay

Explanation:

Answer:

Radioactive Decay

Explanation:

Ap3x

According to Gordon Allport, the type of personality traits that are the most dominant is the central trait or the basic trait.

This refers to a distinctive quality or character of a person. For example curiosity, fair, and dark. etc.

Gordon Allport is a psychologist and personality theorist. He divided personality traits into three categories: cardinal, central, and secondary. According to Allport, the most dominant type of personality trait is the central trait, also called as the "basic trait."

These traits are fundamental to a person's character and shape their overall personalities, such as honesty, kindness, and intelligence. Cardinal traits, on the other hand, are rare and extremely influential traits that shape a person's entire life and behavior, such as religious devotion or political ideology. Secondary traits are less important and more specific, such as being punctual or having a sense of humor.

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Correct answer is blue-purple.

Let's discuss it further below.

To find the wavelength most strongly reflected at the center of the outer surface when a soap bubble with a thickness of 120 nm is illuminated by white light, you should use the formula for constructive interference. Assuming the refractive index n = 1.34, follow these steps:

1. Calculate the optical path difference: The path difference is twice the thickness of the soap film multiplied by the refractive index (n). In this case, it is 2 × 120 nm × 1.34 = 321.6 nm.

2. Determine the wavelength of constructive interference: For constructive interference, the optical path difference must be equal to an integer multiple of the wavelength. Since the optical path difference is 321.6 nm, you can approximate the reflected wavelength to be around 321.6 nm.

3. Identify the color: A wavelength of approximately 321.6 nm corresponds to the blue-purple range of the visible light spectrum.

So, when a soap bubble with a thickness of 120 nm and refractive index of 1.34 is illuminated normally by white light, the wavelength most strongly reflected at the center of the outer surface is blue-purple.

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