A slab of ice floats on a freshwater lake. What minimum volume must the slab have for a 45.0 kg woman to be able to stand on it without getting her feet wet?

In the field of physics, total internal reflection refers to the entire reflection of a beam of light that is traveling through a medium such as water or glass back into the medium itself from the surfaces that surround the medium.

When the angle of incidence is larger than a specific limiting angle, which is referred to as the critical angle, the phenomena will take place. When a ray of light traveling through a medium with a higher index of refraction approaches another medium with an angle of incidence that is greater than the critical angle, a phenomenon known as total internal reflection occurs. In general, this phenomenon takes place at the boundary between two transparent media.

True statements are;

1. A smaller critical angle means the total internal reflection is more likely to occur.

2. Fiber optic cables are practical applications of total internal reflections.

False statements are;

1. When light hits a boundary at a less than the critical angle, it will undergo total internal reflection.

2. Single reflection of light of a silvered mirror is more efficient than total internal reflection so mirrors are often used instead of prisms in optical instruments to minimize light loss.

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According to the data given in the question the net force on the box is of 5 N.

All of the forces that are applied to an object are added up to form the net force. As a consequence of the fact that it (force) is a vector and therefore that two forces with identical magnitudes and opposing directions cancel each other out, the resultant force is the total of the forces, or put another way, the net force is just the total of all the forces.

Given data :

Force on box to the left side (F1) = 15 N

Force on box to the right side (F2) = 20 N

Because both forces are in opposite direction

Hence,

Net force = F2 - F1

Net force = 20 - 15

Net force = 5 N.

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Streamflow is the flow of water in streams, rivers, and other channels, and is a key component of the water cycle. It's influenced by a variety of factors, including the shape and depth of the riverbed, the gradient of the stream, the size and shape of the channel, and the amount of water flowing through it. The given statement is false.It is affected by many factors.

All of these factors influence the velocity of the streamflow. Riverbed and streamflow relationshipThe velocity of streamflow is primarily influenced by the gradient or slope of the riverbed. A shallow slope will not yield high velocity streamflow, but instead will create a slow-moving, meandering stream with a high potential for sedimentation and erosion. In contrast, a steep gradient will create a fast-moving stream with a higher velocity and more turbulent water. As a result, a steeper slope will produce higher velocity streamflow than a shallower slope, which will produce slower-moving streamflow. Therefore, a riverbed with a shallow slope will not yield high velocity streamflow. The statement is false.

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Answer:

.376 m

Explanation:

c = speed of light = 3 x 10^8 m/s

c = wavelength * freq

3 x 10^8 = 7.98 x 10^8  * f

f = .376 meters

Answer:

Hi, thank you for posting your question here at Brainly.

To find the velocity of light or any electromagnetic wave, we use the equation: v = wavelength * frequency. Substituting,

v = 0.5 m * 930 1/s

v = 465 m/s

Brainiest please

Explanation:

Answer:

Frequency of wave = 2.16 Hz (Approx)

Explanation:

Given:

Speed of tsunami = 970 km/h

Wavelength = 450 km

Find:

Frequency of wave

Computation:

Frequency = Speed / Wavelength

Frequency of wave = Speed of tsunami / Wavelength

Frequency of wave = 970 / 450

Frequency of wave = 2.16 Hz (Approx)

Manganese dioxide is the substance that results in a brown or black mark on filter paper when an aromatic side chain is oxidized using 2,3, or 4-chlorotoluene, potassium permanganate, and sodium hydroxide in a reflux device (\(MnO_2\)) (See Picture).

Potassium permanganate (\(KMnO_4\)) is reduced to manganese dioxide (\(MnO_2\)) during the oxidation reaction in the presence of sodium hydroxide (\(NaOH\)) and the aromatic side chain. The filter paper may become stained when the combination is filtered because the manganese dioxide is insoluble in water and forms a dark brown or black precipitate.

Typically, the reaction is conducted in a reflux apparatus, where the reaction mixture is heated under reflux conditions until the purple color of the permanganate solution disappears, signifying the reaction's completion. The reaction mixture is then allowed to cool before filtering to extract the precipitate of manganese dioxide from it.

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When a boxer moves into an oncoming punch, the force experienced is (C) increased

The reason that moving into an oncoming punch increases the force experienced is due to the principles of momentum and force. When two objects collide, the total momentum of the system is conserved,

A boxer moving into an oncoming punch, the force experienced is increased. This is because the force of the punch is added to the force of the boxer's movement. When the boxer moves into the punch, the relative speed between the punch and the boxer is increased, which increases the momentum and thus the force of the impact.

In addition, moving into the punch can also reduce the distance over which the punch is applied, which further increases the force experienced.

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When the area of each plate is doubled while keeping the charge and separation constant, the electric field decreases, the potential difference remains the same, and the stored energy in the capacitor increases four times.

When the area of each plate of a capacitor is doubled while keeping the total charge on each plate and the separation between the plates constant, the following changes occur:

1. Electric Field: The electric field between the plates decreases. The electric field (E) between the plates of a capacitor is inversely proportional to the area (A) of the plates. As the area is doubled, the electric field is halved, assuming the other factors remain constant.

2. Potential Difference: The potential difference (V) across the plates remains the same. The potential difference across the plates of a capacitor depends on the charge (Q) and the capacitance (C), which is determined by the geometric and material properties of the capacitor. Since the total charge and separation between the plates are held constant, the potential difference remains unchanged.

3. Stored Energy: The stored energy in the capacitor increases four times. The energy stored in a capacitor (U) is directly proportional to the area of the plates (A). When the area is doubled, the stored energy is quadrupled (increases by a factor of four).

Therefore, when the area of each plate is doubled while keeping the charge and separation constant, the electric field decreases, the potential difference remains the same, and the stored energy in the capacitor increases four times.

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Answer:

391.67Hz

Explanation:

The fundamental frequency formula in string is expressed as;

Fo = V/2L

V is the velocity of the wave = 329m/s

L is the length of the string = 42cm = 0.42m

Substitute

Fo = 329/2(0.42)

Fo = 329/0.84

Fo = 391.67Hertz

Hence the  fundamental frequency of a mandolin string is 391.67Hz

Answer:

That's essentially how objects in orbits work as they move closer to the body they orbit, they accelerate faster and faster. Our penny will get so fast that, once it comes around the planet, it will be flung very far away, which will then slow it down. This is what creates an elliptical orbit.

Explanation:

Answer:

Because of the Cohesion

The star is moving away from Earth at a velocity of 1.8 x 106 m/s.

The Doppler Effect describes the shift in wavelength of a wave when the source is moving in relation to the observer. The shift can be observed in sound waves, light waves, and other waves.

The Doppler Effect can be used to determine the velocity of objects moving away from an observer, as in the case of stars moving away from Earth.

The velocity of a star moving away from Earth can be determined using the equation:

v = Δλ/λ x c, Where v is the velocity of the star, Δλ is the shift in wavelength of the spectral line, λ is the wavelength of the spectral line measured in the lab on Earth, and c is the speed of light (3.00 x 108 m/s).

In this case, the shift in wavelength of the spectral line is Δλ = 500.3 nm - 500 nm = 0.3 nm.

The wavelength of the spectral line measured in the lab on Earth is λ = 500 nm.

Plugging in these values to the equation above: v = Δλ/λ x cv = (0.3 nm / 500 nm) x (3.00 x 108 m/s) = 1.8 x 106 m/s.

Therefore, velocity of star 1.8 x 106 m/s.

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Answer:

Answer is C

Explanation:

I took it already

Answer:

3.7kg

Explanation:

The following data were obtained from the question:

Volume = 3.7L

Mass =?

Next, we shall convert 3.7L to m³.

This is illustrated below:

1000L = 1m³

Therefore, 3.7L = 3.7/1000 = 0.0037m³

Now, we can obtain the mass of the water as shown below:

Density of water = 1000kg/m³

Volume of water = 0.0037m³

Mass of water =..?

Density = Mass /volume

1000kg/m³ = Mass /0.0037m³

Cross multiply

Mass = 1000Kg/m³ × 0.0037m³

Mass = 3.7Kg

Therefore, the mass of the water is 3.7Kg.

Answer:

3.7

Explanation:

no clue i just found it on chegg and then it was correct

Answer:

\(320.4\:\mathrm{m/s}\)

Explanation:

The momentum of an object is given by \(p=mv\). Therefore, we have the following equation:

\(m_{ba}v_{ba}=m_{bu}v_{bu},\\0.174\cdot v_{ba}=0.005\cdot 1115,\\v_{ba}\approx \boxed{320.4\:\mathrm{m/s}}\)

*Note: it's important to convert grams to kilograms, as kilograms are the SI unit for mass

We have that if control rods were not used in nuclear reactors, the following might occur

but we shall look into what  control rods functions are

The main function of control rods has its place in a nuclear reactor and is used in the the fission rate control of reactor elements

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A Conjunctive adverb is a word that connects to complete clauses with each other and define their relationship.

An adverb is a word or phrase that defines and qualifies the quality of the verb. That means it tell us that how and when the things are happening for the particular adjective or verb. For an example, fast running. Here, the word fast is the adverb because the word fast is telling us about the nature of running which is fast.

A conjunctive adverb is a word that connects two sentences together.

For an example, He is said since I told him about college.

Here, "He is said" since "I told him".

So, the world "since" is the conjunctive adverb because it is connecting the two complete different sentence.

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The α helix and β pleated sheet are examples of the secondary structure of protein. Hence, the correct option is (c).

The secondary structure of a protein refers to the local spatial arrangement of its amino acid residues, which are the building blocks of proteins. The α helix and β pleated sheet are two common types of secondary structure in proteins. The α helix is a right-handed helical structure that is stabilized by hydrogen bonds between the carbonyl group of one amino acid residue and the amide group of another, four residues down the polypeptide chain. The α helix structure resembles a spiral staircase, with the amino acid residues forming the steps and the hydrogen bonds forming the railings. The β pleated sheet, on the other hand, is a sheet-like structure that is stabilized by hydrogen bonds between neighboring amino acid residues in different parts of the polypeptide chain. The β pleated sheet is formed when the polypeptide chain folds back on itself, creating a sheet-like structure with the hydrogen bonds forming the edges of the sheet. The secondary structure of a protein is important because it helps to determine the overall shape of the protein, which in turn determines its function. The α helix and β pleated sheet are important secondary structures in many proteins, including enzymes, antibodies, and structural proteins.

In summary, the α helix and β pleated sheet are examples of the secondary structure of proteins, which refers to the local spatial arrangement of amino acid residues in a protein. The α helix is a right-handed helical structure, while the β pleated sheet is a sheet-like structure. The secondary structure of a protein is important for determining its overall shape and function.

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Yes, there are some planet which are not detected, even if they are large.

Strength of doppler method ;-

The Doppler technique has the main advantage of being able to detect planets in a wide range of orbits - as long as the orbit is It is most sensitive to close to their stars.

Its limitation is that, it can yield only the planet's and orbital properties.

Strengths of transit method ;-

The transit method has the advantage of yielding completely different information of planet's. This method is even more biased to large planets close to their stars.

Its disadvantage is that few planets have the necessary to even be detectable.

If a planet can be detected by both methods, then we can find it's as an indication of it's composition.

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535.1 Newton Force is the magnitude of the acceleration of the chair.

Fnet=Fp×cos35-F

=164×cos35-91

=43.34 N

a=Fnet/m

=43.34/45

=0.963 m/s^2

FN = mg + Fp×sin35

=45×9.8+164×sin35

=535.1 N

Newton is the abbreviation for the SI unit of absolute force known as newton (N). It is described as the amount of force required to accelerate a kilogram of mass by one meter per second. In the foot pound second system, one newton is equivalent to around 0.2248 pounds of force or 100,000 dyne in the centimeter gram second (CGS) system. The newton was given its name in  of Sir Isaac Newton, whose second rule of motion outlines the modifications that a force may cause in a body motion.

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Answer:

a=3.5m/s^2

Explanation:

f=ma(f=force m=mass a=acceleration)

1575=450a

a=1575/450

a=3.5m/s^2

Answer:

3.5ms^-2

Explanation:

m = 450kg, F = 1575N, a = ?

Since F = ma

Making acceleration subject of the formula

We have;

a = F/m

Substituting we have;

a = 1575/450

a = 3.5ms^-2

1.0 c of charge is at one corner of a square of side 0.30 m. -1.0 c is at an adjacent corner. the potential is chosen so that v approaches 0 very far from the charges. the potential at point a is zero,

The potential at point A in the square can be calculated by summing the contributions from the charges, considering the distances between the charges and point A. Now, let's explain the answer in more detail. We can use the formula for the potential due to a point charge, which is given by:

\(\[ V = \frac{kQ}{r} \]\)

Where V is the potential, k is the electrostatic constant (approximately \(8.99 \times 10^9 N m^2/C^2\)), Q is the charge, and r is the distance from the charge to the point where the potential is being calculated.

In this case, we have a charge of +1.0 C at one corner and a charge of -1.0 C at an adjacent corner. Let's assume that point A is located at the midpoint of the side of the square between these two charges. The distance between the charges and point A is equal to the length of the side of the square, which is 0.30 m. To calculate the potential at point A, we can sum the contributions from each charge. The potential due to the +1.0 C charge can be calculated as:

\(\[ V_1 = \frac{kQ_1}{r_1} \]\)

And the potential due to the -1.0 C charge can be calculated as:

\(\[ V_2 = \frac{kQ_2}{r_2} \]\)

Since the potential approaches zero very far from the charges, we can assume that the contributions from each charge cancel each other out, resulting in a net potential of zero at point A. Hence, the potential at point A is zero.

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The potential at point A is 0 volts.

The potential at point A can be found by considering the contribution from each charge to the total potential. Let's start by calculating the potential due to the first charge (1.0 C) at point A. The potential due to a single point charge is given by the equation V = k * Q / r, where V is the potential, k is the electrostatic constant (9 x 10^9 Nm^2/C^2), Q is the charge, and r is the distance between the charge and the point of interest.

In this case, the distance between the first charge and point A is the diagonal of the square, which can be calculated using the Pythagorean theorem as d = √(0.3^2 + 0.3^2) = 0.424 m. Plugging in the values, we have V1 = (9 x 10^9 Nm^2/C^2) * (1.0 C) / (0.424 m) = 2.12 x 10^10 V.

Now, let's calculate the potential due to the second charge (-1.0 C) at point A. Following the same steps, we find V2 = (9 x 10^9 Nm^2/C^2) * (-1.0 C) / (0.424 m) = -2.12 x 10^10 V.

Finally, to find the total potential at point A, we add the potentials due to each charge: V_total = V1 + V2 = 2.12 x 10^10 V + (-2.12 x 10^10 V) = 0 V.

Therefore, the potential at point A is 0 volts.

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The input voltage is 120 V and the transformer is a step up transformer due to increase in the voltage induced in the secondary coil.

The input voltage of the transformer is the voltage of the primary coil and it is calculated as follows;

Ns/Np = Es/Ep

where;

2X/X = 240/Ep

2 = 240/Ep

Ep = 240/2

Ep = 120 V

Thus, the transformer is a step up transformer due to increase in the voltage induced in the secondary coil.

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The RMS value of an AC voltage is the effective or average value of the voltage over time. It is calculated by dividing the peak voltage by the square root of 2. In this case, if the AC voltage has a peak of 480 V, the RMS value can be calculated as follows:

RMS Voltage = Peak Voltage / sqrt(2)
RMS Voltage = 480 V / 1.414
RMS Voltage = 339.4 V

Therefore, the RMS value of an AC voltage that has a peak of 480 V is 339.4 V. It is important to note that the RMS value is the most useful value in AC circuits as it determines the power delivered to a load.

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Speed=

\(33m {s}^{ -1} \)

Distance=

\(163m\)

speed= distance/time

So,

Time= distance/speed

Time= 163/33

\(\huge\underline\mathtt\colorbox{cyan}{4.9393s}\)