What is the critical angle for the interface between water (n = 1.33) and Lucite (n = 1.51)?

Answer: He was labeled as one of Africa's cruelest dictators because during his eight year reign many civilians were massacred. He drove out Uganda's Indian and Pakistani citizens and spent large amount of money on the military which led to the economic decline of the country.

Explanation:

Answer:

1. Work Is a type of Physical Activity  

2. Power is Basically Having control of Society

Explanation:

The object is traveling at 10 m/s.

Momentum is defined as the product of an object's mass and velocity. The formula for momentum is:

p=mv

where,

p = momentum

m = mass

v =  velocity

We can use this formula to find the velocity of an object given its momentum and mass. To solve for velocity, we can divide both sides of the equation by mass:

velocity = momentum/mass

In this case, the object has a mass of 40 kg and a momentum of 400 Kgm/s, so we can plug in these values to find the velocity:

velocity = 400 Kgm/s / 40 kg = 10 m/s

Therefore, the object is traveling at 10 m/s.

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Surface waves are winds blowing through the  surface of ocean water. Therefore, option B is correct. All other options are just examples of waves and not wind.

Ocean water flows in currents, much like air does in the atmosphere. A current is an oceanic current, or stream, of flowing water. The primary cause of surface currents is wind, although not daily winds.

The main wind belts are what produce surface currents. These winds always blow in the same direction. so that they can maintain the direction of the water's flow.

Three factors influence surface currents: global wind patterns, Earth's rotation, and the configuration of ocean basins. Because they disperse heat over the earth, surface currents are crucial. Global climate is significantly influenced by surface currents as well.

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the correct answer is option a. m^2, as it is the proper unit for the second moment of area (q) in the shear formula.

In the shear formula, τ=vqit, q represents the area over which the shear force is applied. The units of q should be in square meters (m^2) to ensure that the overall unit of the formula is in Newtons per square meter (N/m^2) or Pascals (Pa). Therefore, option (e) m^2 is the proper unit of q. Option (a) m^2 is also correct but it is not specifically labeled as a unit.

Option (b) m^4 is incorrect because it is a unit of volume. Option (c) dimensions and option (d) me are not valid units of area. Lastly, option (f) None of these is incorrect since option (e) m^2 is the correct answer. The proper unit of q in the shear formula τ = vqit is "m^2".

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Using Newtons law

\(\\ \sf\longmapsto Force=Mass\times Acceleration\)

\(\\ \sf\longmapsto Mass=\dfrac{Force}{Acceleration}\)

\(\\ \sf\longmapsto Mass=\dfrac{340}{3.8}\)

\(\\ \sf\longmapsto Mass=89.4kg\)

Answer:

The volume of the coin is 4.236 x 10⁻⁷ m³

Explanation:

Given;

radius of a coin, r = 1.06 cm = 0.0106 m

thickness of the coin, h = 1.2 mm = 0.0012 m

The volume of the coin is given by;

volume = Area x thickness

Area of the coin = πr² = π (0.0106)² = 3.5304 x 10⁻⁴ m²

The volume of the coin = (3.5304 x 10⁻⁴ m²) x (0.0012 m)

The volume of the coin = 4.236 x 10⁻⁷ m³

Therefore, the volume of the coin is 4.236 x 10⁻⁷ m³

In the speed-time graph of a car in the figure, the correct statement is, the distance traveled by car is 75 m. Thus, option C is correct.

Speed is the distance traveled by an object per unit of time. In the graph, speed is taken in the Y axis, and time in the X axis. In the speed-time graph, the acceleration of an object and the distance traveled by an object can be determined. In the speed-time graph, the acceleration is obtained by taking the slope. From the figure, the speed of the car decreases, and it is called deceleration. If the car has a constant speed, the graph has a line parallel to the X-axis.

The distance traveled by car is obtained by determining the area of the figure.  The area of the figure is a triangle.

Distance = Area of the triangle = 1/2 (base×height)

                                                    = (15×10) /2

                                                    = 75m

The distance traveled by car is 75m. The ideal solution is C.

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Answer:

La persona está nadando en la alberca a una profundida de 5.575 metros.

Explanation:

La presión absoluta (\(P_{tot}\)) experimentada por la persona es la suma de la presión atmosférica (\(P_{atm}\)) y la presión hidrostática de la columna de agua de la alberca (\(P_{h}\)), medidas en kilopascales. Es decir,

\(P_{tot} = P_{atm}+P_{h}\) (1)

\(P_{tot} = P_{atm} + \frac{\rho\cdot g \cdot z}{1000}\) (2)

Donde:

\(\rho\) - Densidad del fluido de la alberca, medida en kilogramos por metro cúbico.

\(g\) - Aceleración gravitacional, medida en metros por segundo al cuadrado.

\(z\) - Profundidad de la persona en la alberca, medida en metros.

Si sabemos que \(P_{atm} = 101.325\,kPa\), \(\rho = 1000\,\frac{kg}{m^{3}}\), \(g = 9.807\,\frac{m}{s^{2}}\) y \(P_{tot} = 156\,kPa\), entonces la profundidad de la persona en la alberca es:

\(156 = 101.325 +\frac{(1000)\cdot (9.807)\cdot z}{1000}\)

\(54.675 = 9.807\cdot z\)

\(z = 5.575\,m\)

La persona está nadando en la alberca a una profundida de 5.575 metros.

Answer:

Understanding patterns is important for human development because it allows us humans to make more Educated guesses in life. It allows the human brain to strengthen its logical thinking.

Explanation:

For example: A baby will occasionally learn to roll over or crawl through time. The pattern of doing such things allows the baby to learn more from its actions to make new ones.

I hope this helped im new but want to help :)  

When the pole is lifted, it could be able to supply energy to the pole - vaulter much like that of a spring that launches the pole vaulter upwards.

We know that the pole vault is one of the popular sports especially in the Unites States. It is a competition that takes place even at the Olympic level and has a lot of athletes that do compete in the competition.

We know that as the pole unbends, it creates force that launches the pole-vaulter up and over the bar using your knowledge of potential and kinetic energy.

This implies that there are a series of energy conversions that do take place in the pole vault as it is in operation as we can see here. Thus, it is the series of the energy conversions that takes place in the pole vaulting that enables the athlete to be able to launch high in the game as we see.

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Answer:

If you add the 2 velocity vectors you get the velocity of the third vector which is the (change in) velocity of the cue ball after striking the cushion

V * 2 * cos 45 = 4 * cos 45 = 2.83 m/s

The sound intensity level (b) of the given sound wave is 20 decibels. The sound intensity level (SIL) in decibels (dB) can be calculated using the formula.

In this formula, I is the intensity of the sound wave, and I₀ is the reference intensity. The reference intensity for sound is typically 10⁻¹² W/m².

SIL (dB) = 10 * log10(I / I₀)

In your case, the intensity of the sound wave (I) is 100 times the reference intensity (I₀). So, we can write the equation as:

SIL (dB) = 10 * log10(100 * I₀ / I₀)

Notice that I₀ appears in both the numerator and denominator, so we can cancel it out:

SIL (dB) = 10 * log10(100)

Now, we can use the properties of logarithms to simplify the expression:

SIL (dB) = 10 * (2) = 20 dB

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Answer:

the answer is A. blue

Explanation:

Answer:

C

bc i said so Imao

Potential difference, is same for all three resistors.

Hence, the correct option is B.

A. The current, on the other hand, is not the same for all three resistors, as it depends on the resistance of each resistor and the total resistance of the circuit.

B. The potential difference (delta V) across each resistor is the same in this circuit. This is because the circuit is a series circuit, meaning that there is only one path for the current to flow. Therefore, the same amount of charge flows through each resistor, resulting in the same potential difference across each resistor.

Hence, the correct option is B.

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Moving a charge around on an equipotential surface at potential V with constant speed requires no work. This is because the equipotential surface is defined as a surface where the potential is constant, meaning that the potential energy of the charge at any point on the surface is the same. Since work is defined as the transfer of energy from one form to another, and no energy is being transferred in this case, no work is required.

To illustrate this concept, imagine a ball rolling on a flat surface. The ball will continue to roll with constant speed, and no additional work is required to keep it moving at that speed. Similarly, a charge moving on an equipotential surface at potential V will continue to move at a constant speed without any additional work being required.

It's important to note that this only applies to motion along an equipotential surface. If the charge were to move from one equipotential surface to another with a different potential, work would be required to change the potential energy of the charge.

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Answer:

aceleration doubles

Explanation:

From Newton's secon law, one has

F=m*a

where F is the force, m the mass and a the aceleration.

In general, if m becomes m/2, in order to have the same force,

the acceleration must be doubled:

\(F=m*a=\frac{m}{2} (2*a)\)

In our particular case,

\(12=6*a=\frac{6}{2} (2*a)\\12=3(2*a)\)

Answer:

a. The arrow follows a parabolic path

b. As the arrow hits the ground,

Explanation:

a Describe the arrow's trajectory, in particular noting approximately when the arrow has the most deceleration, the most acceleration, and then why the shift begins to happen. Cover all major points in the trajectory from initial shot to final resting place.

This is because, the arrow is a projectile and its path follows a parabolic curve as it goes from initial shot to final resting place.

Its equation of motion is governed by y = ut - 1/2gt² where y = parabolic path, u = initial speed of arrow, t = time and g = acceleration due to gravity.

As the arrow rises, it undergoes the most deceleration. This is because as it rises, its speed decreases until it gets to the peak of its path, where its velocity is momentarily zero.  

Also, as the arrow drops, it undergoes the most acceleration. This is because as it drops from its peak, its speed increases until it gets to the bottom of its path, where its velocity is maximum and given by v = u' - gt where u' = velocity at peak = 0 m/s. So, v = 0 - gt = -gt.

b. When is the arrow moving fastest?

As the arrow hits the ground, its velocity is highest (maximum), so it is fastest at this point.

Answer:

a chicken

a chicken came first

Answer:

A Chicken

A chicken came first

The motion of the car relative to the student is towards the student. Based on the given information, the car's engine produces a frequency of 250 Hz.

However, the student listening to the engine hears a frequency of 260 Hz. This difference in frequency can be explained by the Doppler effect, which is the change in frequency of a wave due to the source's or the observer's motion.

In this case, since the frequency heard by the student is higher than the frequency produced by the engine, we can conclude that the car is moving toward the student. This causes the sound waves to be compressed, increasing the frequency heard by the student. This is known as the "blue shift" in the Doppler effect.

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The figure given in the question shows a circuit with resistors that are not all in parallel or series. As a result, it will be necessary to determine the equivalent resistance of each group of resistors separately.

The groups of resistors in this circuit are as follows:R2 and R3 are connected in series, and their equivalent resistance can be calculated using the following equation:

R23 = R2 + R3

= 47 Ω + 100 Ω

= 147 Ω

R5 and R6 are connected in series, and their equivalent resistance can be calculated using the following equation:R56 = R5 + R6 = 150 Ω + 47 Ω = 197 ΩR23 and R4 are connected in parallel, and their equivalent resistance can be calculated using the following equation:

1/R234 = 1/R23 + 1/R4

= 1/147 Ω + 1/220 Ω

= 0.0105 ΩR234

= 95.238 Ω

Finally, R1 and R56 are connected in series, and their equivalent resistance can be calculated using the following equation:

R156 = R1 + R56

= 100 Ω + 197 Ω

= 297 Ω

Therefore, the equivalent resistance of the entire circuit is

R = R156 + R234

= 297 Ω + 95.238 Ω

= 392.238 Ω

= 3.92 × 10² Ω (expressed to three significant figures).

Therefore, the equivalent resistance of the circuit is 3.92 × 10² Ω.

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The most scientific guess (hypothesis) based on what is known about the behavior of galaxies is that Galaxies are continuously moving away from each other. This hypothesis can be tested using Hubble's Law.

Hubble's law indicates that almost all galaxies are moving apart from one another because the universe as a whole is expanding. Choose any two galaxies at arbitrarily, and they're most likely traveling apart from each other.

Hubble discovered that galaxies move away from us at a rate proportionate to their distance: more distant galaxies move away faster than closer ones. The accompanying graphic shows Hubble's classic graph of measured velocity vs. distance for neighboring galaxies.

The graph shows a linear relationship between galaxy velocity (v) and distance (d).

The equation for the above linear relationship is:

                                          v = H₀ x d

Where:

H₀ is the expansion rate

v = velocity of the galaxy; and

d = distance.

Using the above formula, the astronomer can measure or test to know whether indeed the new galaxy is moving relative to the Milky Way galaxy and at what rate.

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Answer:

this is actually

Explanation:

6 points

Answer:

helppppp

Explanation:

Since F₁ is directed towards the south and F₂ is directed towards the east, we can use the Pythagorean theorem to find the magnitude of the net force:

 F = √(F₁² + F₂²)

The magnitude of the net electrostatic force on the test charge in newtons is given by the formula: F= k(q1q2)/r²

where k is Coulomb's constant, q1 is the charge on particle a, q2 is the charge on particle b, and r is the distance between the test charge and the other two charges.

Using the given values, we can find the magnitude of the net electrostatic force on the test charge as follows: F₁

= k(2e)(-2e)/(0.0200m)²F₂

= k(2e)(3e)/(0.0200m)²

The net force is obtained by taking the vector sum of F₁ and F₂.

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The magnitude of the angular acceleration of the wheels is 0.14 rad/s².

To calculate the angular acceleration, we can use the formula α = (ω² - ω₀²) / (2 * θ), where α is the angular acceleration, ω is the final angular velocity (0 rad/s, as the car comes to a stop), ω₀ is the initial angular velocity, and θ is the total angle rotated.

In this case, the car stops in 30 complete turns, which is equivalent to 30 * 2π radians. We need to find the initial angular velocity (ω₀) using the car's linear speed. Let's assume the car's linear speed (v) and wheel radius (r) are given. Then, ω₀ = v / r. Plug these values into the formula to find the magnitude of the angular acceleration of the wheels.

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Answer:

Dark matter and visible matter.

Answer:

A foundation.

Explanation:

Balance can be considered a foundation for other physical skills because it is essential for performing many movements and activities effectively and efficiently. Having good balance helps individuals maintain stability and control over their body, which is important for actions like walking, running, jumping, and even standing still. Without good balance, individuals may struggle with coordination, experience falls or injuries, or have difficulty performing tasks that require precise movements. Therefore, developing and maintaining good balance can serve as a foundation for other physical skills and overall physical health.

S, P, D, and f are the four potential subshells in quantum mechanical theories. The angle momentum quantum number, l, is represented by these letters in numerical form.

A subshell is a group of states that make up a shell and are identified by the azimuthal quantum number, l. Subshells s, p, d, and f are represented by the values l = 0, 1, 2, and 3, respectively. The equation 2(2l + 1) states how many electrons can fit into a subshell at once.

The circular routes that electrons take in an atom's shells as they circle its nucleus. (In line with the Bohr Model). The primary quantum number, n, serves as a representation of the shells. Additionally, each shell is divided once more into many subshells.

Four subshells are present: s, p, d, and f.

For instance, the first shell has just one sub-shell, which is s.

There are two sub-shells in the second shell: s and p.There are three sub-shells in the third shell: s, p, and d.The remaining shells are made up of all four subshells: s, p, d, and f.

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Please find attached photograph for your answer.

Hope it helps.

Do comment if you have any query.

Using the z-distribution, it is found that  maximum the error of the estimate is of 0.0475 hours.

X ± Z(S ÷ √n)

x= is the sample mean.

z =is the critical value.

n= is the sample size.

ơ  =is the standard deviation for the population.

margin of error is the given by:-

Margin of Error  given as = Z * ơ / √n

We have  90% the confidence level, hence, z is the value of Z that has a p-value of , so the critical value of  z = 1.645.

putting value in equation we get

Margin of Error= 1.645*.5/√300

so, Margin of Error is 0.0475 hours

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