9, You are piloting a helicopter which is man vertically at a un

you reach 196.00 m,

velocity of 8.50 m/

a) When does th

14.70 m/s. When

a horizontal

B vertically ata uniform velocity of 14.70 m/s

ach 196.00 m, you see Barney (Uh-oh). A la

1. A large object is projected with a horizon

city of 8.50 m/s from the rising helicopter.

Vhen does the ball reach Barney's head if he

ad if he is standing in a hole with his head at

level? (7.99 s]

b) Where do

have to be horizontally relative to the helicopter's position? (68.0 ml

city when it hits the ground? - 63.7 m/s]

c) What is the vertical velocity when it hits the

Answer:

Particle physics

Explanation:

The field of physics that studies particles smaller than the atom is called "particle physics" or "high-energy physics". It is concerned with the study of the fundamental constituents of matter and the interactions between them at extremely high energies. Particle physics investigates the properties and behavior of particles such as quarks, leptons, and bosons, as well as the forces that govern their interactions. Particle accelerators, such as the Large Hadron Collider (LHC), are used to study particles at high energies and reveal the fundamental nature of the universe.

Coulomb's experiment aimed to demonstrate the inverse-square law of electrostatic interaction, which it successfully achieved. He used a torsion balance to measure the forces of attraction and repulsion between charged objects.

In his experiments, Coulomb suspended two identical charged pith balls from the same point, each on separate thin strings, causing them to hang horizontally and in contact with each other. Another charged pith ball, also suspended on a thin string from the same point, could be brought close to the two hanging pith balls, resulting in their repulsion.

The experiments conducted by Coulomb confirmed that the electrostatic force of repulsion between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

This relationship can be mathematically expressed as:

\(\[ F = \frac{{kq_1q_2}}{{r^2}} \]\)

Here, F represents the electrostatic force of attraction or repulsion between the charges, q1 and q2 denote the magnitudes of the charges, r is the distance between the charges, and k is Coulomb's constant.

When considering two electrons separated by a distance r, the electrostatic force of repulsion between them can be calculated as:

\(\[ F_e = \frac{{kq_1q_2}}{{r^2}} \]\)

where q1 = q2 = -1.6x10^-19C, representing the charge of an electron.

Thus, the electrostatic force of repulsion between two electrons is:

\(\[ F_e = \frac{{kq_1q_2}}{{r^2}} = \frac{{9x10^9 \times 1.6x10^-19 \times 1.6x10^-19}}{{r^2}} = 2.3x10^-28/r^2 \]\)

On the other hand, when considering the gravitational force of attraction between two electrons, it can be expressed as:

\(\[ F_g = \frac{{Gm_1m_2}}{{r^2}} \]\)

where m1 = m2 =\(9.11x10^-31kg\) represents the mass of an electron, and G = \(6.67x10^-11N.m^2/kg^2\) is the gravitational constant.

Therefore, the gravitational force of attraction between two electrons is:

\(\[ F_g = \frac{{Gm_1m_2}}{{r^2}} = \frac{{6.67x10^-11 \times 9.11x10^-31 \times 9.11x10^-31}}{{r^2}} = 5.9x10^-72/r^2 \]\)

Consequently, the ratio of the electrostatic force of repulsion between two electrons to their gravitational force of attraction can be calculated as:

\(\[ \frac{{F_e}}{{F_g}} = \frac{{\frac{{2.3x10^-28}}{{r^2}}}}{{\frac{{5.9x10^-72}}{{r^2}}}} = 3.9x10^43 \]\)

This implies that the electrostatic force of repulsion between two electrons is approximately 10^43 times greater than their gravitational force of attraction. It is important to note that the gravitational force between the pith balls should not have been included in Coulomb's experiment since it is significantly weaker, by several orders of magnitude, compared to the electrostatic force between the charges on the balls.

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The number of significant figures in an experimental measurement is determined by the accuracy of the instrument or method used to make the measurement.

Significant figures are the digits in a measurement that are known with certainty plus one digit that is uncertain. They are used to indicate the precision of a measurement and to communicate the level of uncertainty in the measurement.

For example, in the measurement 1.2345 kg, there are 5 significant figures: 1, 2, 3, 4, and 5. The first four digits are known with certainty, while the last digit (5) is uncertain.

It is important to keep track of the number of significant figures in each measurement and to report the final result with the appropriate number of significant figures. This ensures that the final result accurately reflects the precision and uncertainty of the measurements used in the calculation. Additionally, the number of significant figures can be affected by calculations involving the measurement, such as rounding or multiplication.

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Answer:

1. Schedule your activities

2. Prioritize the more important tasks

3. Avoid procrastination

Explanation:

Time-management techniques are strategies or methods developed by people to help them effectively manage their time. My best friend in the scenario above cannot effectively manage his time because he has a lot of activities crowding up his time.

To get better in his grades, he should strike a balance between school work and extracurricular activities. He should make a workable schedule where only the most important tasks are prioritized. He should also learn to execute these tasks on time without postponing them.

Answer:

Sample Response: He should decide on a study time that works best for him, create a study schedule, and manage his study sessions by using a daily to-do list

Explanation:

got it right on edge 2021

(a) A = B × r is a vector potential for B, where r = {x, y, 0}.

(b) The flux through a surface S can be calculated as Φ = ∫B·dA, where B is the magnetic field and dA is an infinitesimal area vector perpendicular to the surface.

(a) To verify that A = B × r is a vector potential for B, we need to show that ∇ × A = B.

Using the cross product property, we have ∇ × A = ∇ × (B × r). Applying the vector identity (A × B) × C = B(A · C) - C(A · B), we get ∇ × (B × r) = B(∇ · r) - r(∇ · B).

Since ∇ · r = 0 (as r = {x, y, 0}), and ∇ · B = 0 (as B has a constant magnitude in the z-direction), we find that ∇ × A = B, verifying A = B × r as the vector potential for B.

(b) The flux through a surface S can be calculated as Φ = ∫B·dA, where B is the magnetic field and dA is an infinitesimal area vector perpendicular to the surface.

Given that B has a constant strength b teslas in the z-direction, the flux through surface S will be Φ = ∫B·dA = ∫(0, 0, b) · (dxdy) = b∫dxdy = bA, where A is the area of the surface S.

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Answer:

b

Explanation:

Answer:

B).315mph

Explanation:

Let the speed of the plane = p

Let the speed of the wind = w

Set up the system equation as;

                                     Relative V:               Time:                          Distance:

in wind direction:          p + w                         2                                  700

against wind:                 p - w                         2.5                                700

2(p + w) = 700

2.5(p - w) = 700

2p + 2w = 700

2.5p - 2.5w = 700

2.5  x:     5p + 5w = 1750

2  x:        5p - 5w = 1400

10p = 3150

p = 315 mph

Therefore, he speed of the plane in still air is 315 mph

The advantage of a diffraction grating over a double slit in dispersing light into a spectrum is that it provides higher resolution and more accurate measurements of the wavelengths.

Diffraction gratings consist of a large number of slits, which create multiple overlapping diffraction patterns.

This results in a more detailed and distinct separation of the individual wavelengths in the spectrum.

Additionally, the interference pattern produced by a diffraction grating is narrower and more focused, leading to better accuracy in determining the wavelengths of the light source.

Summary: A diffraction grating offers greater resolution and accuracy in dispersing light into a spectrum compared to a double slit due to its larger number of slits and more focused interference pattern.

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Answer:

Heat would flow from a hot cup of coffee to a room temperature table.

Explanation:

Thermal energy will flow from a hot cup of coffee to a room temperature table.

Heat is a form of thermal energy which is the  average kinetic energy of the particles of system.

When you change altitude, or go deep underwater, the change in air pressure may cause tension and discomfort in the eardrum membrane.

The eardrum membrane, also known as the tympanic membrane, is a thin, translucent, and circular layer of tissue. It is situated in the ear canal, and it divides the outer and middle ear. The eardrum vibrates in response to sound waves, causing the auditory ossicles in the middle ear to move.

The eardrum is composed of three layers of tissue. The outer layer is made up of skin cells, the middle layer is made up of fibrous tissue, and the inner layer is made up of mucus-secreting cells. The eardrum is one of the body's most sensitive organs because it is so thin, measuring only 0.1 millimeters thick. Because of its susceptibility to pressure, it can be easily harmed by changes in air pressure caused by loud noises, diving, or flying in an airplane.

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Answer:

The  distance traveled by the ball before it lands in the other player's glove is 130.96 m.

Explanation:

Given;

angle of projection of the ball, θ = 40⁰

initial velocity of the ball, u = 36.1 m/s

The distance traveled by the ball before it lands in the other player's glove is the range of the projectile, calculated as follows;

\(R = \frac{u^2 sin(2\theta)}{g} \\\\R= \frac{36.1^2 \times sin(2\times 40)}{9.8} \\\\R = \frac{36.1^2 \times sin(80)}{9.8} \\\\R = 130.96 \ m\)

Therefore, the  distance traveled by the ball before it lands in the other player's glove is 130.96 m.

Answer:

59g

Explanation:

The tennis ball with a velocity of 18 m/s and momentum of 1.06 kg m/s then the mass of the tennis ball in grams will be 59 grams (approx) two significant figures.

Regardless of the frame of reference, momentum is a conserved quantity in any inertial frame, which means that if an enclosed system is not subject to outside influences, its total linear momentum remains constant.

Additionally, momentum is preserved in general relativity, electrodynamics, quantum mechanics, quantum field theory, and special relativity (using a modified formula). It is a manifestation of translational symmetry, one of the basic symmetries of space and time.

According to the question, the given values are :

Velocity, v = 18 m/s

Momentum, p = 1.06 kg m/s

p = m × v

1.06 kg m/s = m × 18 m/s

m = 1.06 / 18

m = 0.0589 kg or

m = 58.9 grams or 59 grams approx in two significant figures.

So, the mass will be 59 grams.

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When a 0.40-kg mass is attached to a vertical spring, the spring stretches by 15 cm . mass attached to the spring to result in a 0.50- s period of oscillation is 0.113 kg .

The period of oscillation of a mass-spring system is given by the formula:

     \(T = 2\pi  * \sqrt{(m/k)}\)

where T is the period of oscillation, m is the mass attached to the spring, and k is the spring constant.

The spring constant is given by the formula:

             k = F/x

where F is the force exerted by the spring and x is the displacement of the spring from its equilibrium position.

In this problem, we know that a 0.40-kg mass attached to the spring causes a 15-cm displacement. We can use this information to find the spring constant:

           k = F/x = mg/x

where g is the acceleration due to gravity, which is approximately 9.81 m/s².

Substituting the given values, we get:

          k = (0.40 kg) * (9.81 m/s²) / (0.15 m)

             = 26.12 N/m

Now we can use the formula for the period of oscillation to find the mass that must be attached to the spring to result in a 0.50-s period of oscillation:

         \(T = 2\pi  * \sqrt{(m/k)}\)

Rearranging the formula, we get:

         m = (T²* k) / (4π²)

Substituting the given values, we get:

          m = (0.50 s)² * (26.12 N/m) / (4π²)

              = 0.113 kg

Therefore, a mass of approximately 0.113 kg must be attached to the spring to result in a period of oscillation of 0.50 s.

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Answer:

A opção A está correta.

O sistema formado pela garrafa térmica e a água perde 400 cal de calor para o meio ambiente.

Option A is correct.

The system formed by the thermos and the water loses 400 cal of heat to the environment.

Explanation:

Quando a temperatura de um sistema reduz, fica claro que o sistema perdeu calor ou energia térmica. Como a temperatura é um dos indicadores mais claros disso, esta conclusão é hermética e correta.

Mas, para saber a quantidade de calor perdida para o meio ambiente, agora fazemos alguns cálculos de energia térmica.

Transferência de calor de ou para o sistema de água e garrafa térmica = c × ΔT

c = capacidade térmica do sistema de água e garrafa térmica = 80 cal /°C

ΔT = Alteração da temperatura do sistema de água e garrafa térmica = (temperatura final) - (temperatura inicial) = 55 - 60 = -5°C

Calor transferido = 80 × -5 = -400 cal.

O sinal de menos mostra que o calor é transferido para fora do sistema, ou seja, o calor é perdido no sistema.

Espero que isto ajude!!!

English Translation

The thermos (also known as "Dewar vase") is an extremely useful device to conserve bodies (essentially liquid) at high temperatures, minimizing energy exchanges with the environment, which is generally colder. A thermos contains water at 60 o C. The thermos + water set has a thermal capacity of C = 80 cal / o C. The system is placed on a table and, after a considerable period of time, its temperature decreases to 55 o C. In this case, it is concluded that the system formed by the thermos and the water inside:

a) lost 400 cal. B) gained 404cal. C) lost 4 850 cal. D) gained 4 850 cal. E) did not exchange heat with the external environment.

Solution

When a system's temperature reduces, it is clear to conclude that the system has lost heat or thermal energy. Since temperature is one of clearest indicators of this, this conclusion is airtight and correct.

But, to know the amount of heat lost to the environment, we now do some thermal energy calculations.

Heat transferrred from or to the water and thermos system = c × ΔT

c = heat capacity of the water and thermos system = 80 cal/°C

ΔT = Change in temperature of the water and thermos system = (final temperature) - (initial temperature)

= 55 - 60 = -5°C

Heat transferred = 80 × -5 = -400 cal.

The minus sign shows that the heat is transferred out of the system, that is, the heat is lost from the system.

Hope this Helps!!!

Answer:

Echo..... when the sound reflects back

(a) The final angular velocity of the flywheel after 3 complete revolutions is 4.96 rad/s.

(b) The time taken for the flywheel to make 3 complete revolutions is 5.93 s.

The final angular velocity of the flywheel after 3 complete revolutions is determined by applying third kinematic equation as shown below;

θ = 2π (rad/rev) x (3 rev) = 18.85 rad

ωf² = ωi² + 2αθ

ωf² = (1.4)² + 2(0.6)(18.85)

ωf² = 24.58

ωf = √24.58

ωf = 4.96 rad/s

The time taken for the flywheel to make 3 complete revolutions is calculated as follows;

ωf = ωi + αt

t = (ωf  - ωi)/α

t = (4.96 - 1.4)/0.6

t = 5.93 s

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Answer:

D. Pearl Harbor

Explanation:

Answer:

28 N

Explanation:

From the question given above, we were told that 10 N force and 18 N force act in the same direction on the object.

The net force acting on the object can be obtained by simply adding both forces together since they both act on the object in the same direction. This is illustrated below:

Force 1 (F₁) = 10 N

Force 2 (F₂) = 18 N

Net force (Fₙ) =?

Fₙ = F₁ + F₂ (since they both act in the same direction)

Fₙ = 10 + 18

Fₙ = 28 N

Therefore, the net force acting on the object is 28 N.

When substances change state, the molecules remain the same and there is no change in mass. This is because the molecules themselves do not break apart or form new chemical bonds.

Molecules are particles made up of two or more atoms that are bound together. They are the smallest units of matter that can still retain the properties of the substance they are part of. For example, water is made up of two hydrogen atoms and one oxygen atom, which form a molecule. Molecules vary in size and complexity; some molecules, such as proteins, are made up of hundreds of atoms. Molecules are held together by chemical bonds, which are forces of attraction between the atoms. These bonds can be of several different types, such as covalent, ionic, and hydrogen bonds. Molecules can interact with each other and with other substances, such as solids, liquids, and gases, to create new substances with different properties. Understanding the behavior of molecules is essential to the study of chemistry, biology, and other sciences.

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Answer:

it's A

Explanation:

I JUST A FROM THE TOPIC

The average velocity of  you and your family go from Charleston to New Orleans is (Vₐ)= 152.92 km/h

The term velocity explains that the object or particle displacement within the respected time.  Average velocity is total displacement divided by total time.

To calculate the value of average velocity we are using the formula here is,

Vₐ = (s₁+s₂)/(t₁+t₂)= sₐ/tₐ

Here we are known,

t₁= You and your family leave to go from Charleston to New Orleans = 7:00 am.

t₂=You and your family reached to go from Charleston to New Orleans = 4.00 pm.

tₐ=Time interval between the leaving and reaching time=9 hour.

sₐ= The trip’s distance to go from Charleston to New Orleans= 850 miles

Now we put the values in the above equation we get,

Vₐ =sₐ/tₐ

Or, Vₐ =850 miles/9 hour

Or, Vₐ =94.4 miles/hour.

Or, Vₐ = 152.92 km/hour.

According to the calculation we can write that,

The average velocity of  you and your family go from Charleston to New Orleans is (Vₐ)= 152.92 km/h

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On vacation you and your family go from Charleston to New Orleans you leave at 7:00 am and arrive at 4:00 pm and the trip’s distance is 850 miles. what is the average velocity of the trip?

Answer: B

Explanation:

Your'e asking about how waves get closer and louder A it isn't moving so no, C it's not saying if it's near or not and D is going trough another procedure so that leaves B behind

(a) The resonant frequency of an LC circuit is given by the equation:

f = 1 / (2π√(LC))

Where f is the frequency, L is the inductance, and C is the capacitance.

We can rearrange this equation to solve for L:

L = 1 / (4π²f²C)

Plugging in the given values, we get:

L = 1 / (4π² * (10.4kHz)² * 340μF) = 0.115H

Therefore, the inductance of the circuit is 0.115H.

(b) The total energy in an LC circuit is given by the equation:

E = 1/2 * L *\(I_{max}\)²

Where E is the total energy, L is the inductance, and \(I_{max}\) is the maximum current.

Plugging in the given values, we get:

E = 1/2 * 0.115H * (7.20mA)² = 0.032J

Therefore, the total energy in the circuit is 0.032J.

(c) The maximum charge on the capacitor is given by the equation:

\(Q_{max}\)= C *\(V_{max}\)

Where \(Q_{max}\) is the maximum charge, C is the capacitance, and \(V_{max}\) is the maximum voltage.

At resonance, the maximum voltage across the capacitor and inductor are equal and given by:

\(V_{max}\) = \(I_{max}\) / (2πfC)

Plugging in the given values, we get:

\(V_{max}\) = 7.20mA / (2π * 10.4kHz * 340μF) = 0.060V

Therefore, the maximum charge on the capacitor is:

\(Q_{max}\) = 340μF * 0.060V = 20.4μC

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Given:

Mass of student, m = 60 kg

Height, h = 6 m

Let's find the Gravitational Potential Energy (GPE).

To find the GPE, apply the formula:

GPE = m x g x h

Where:

m is the mass in kg = 60 kg

g is the acceleration due to gravity = 9.8 m/s²

h is the height in meters = 6m

Plug in values to find the GPE:

GPE = 60 x 9.8 x 6

GPE = 3528 J

Therefore, the Gravitational Potential Energy (GPE) is 3528 Joules.

ANSWER:

3528 J

Answer: Energy can neither be created nor destroyed but it can only be transformed from one form to another.

Explanation: According to the law of conservation of energy given by Julius Robert Mayer Energy can neither be created nor destroyed but it can only be transformed from one form to another.

it can be explained by an example that when we burn a candle, the chemical energy of wax is converted into light energy.

Also in dams the running water of the river is used to convert mechanical energy into hydroelectric energy

The Rankine active coefficient for an angle of internal friction of 45 degrees is 0.500.

The Rankine active coefficient of an angle of internal friction of 45 degrees is 0.500. To determine the Rankine active coefficient, the following formula is used:

Rankine active coefficient = tan²(45° + φ/2) / tan²(45° - φ/2)

Where:φ is the angle of internal friction

Substituting φ = 45° into the formula,

Rankine active coefficient = tan²(45° + 45°/2) / tan²(45° - 45°/2)

= tan²(67.5°) / tan²(22.5°)

= 2.414 / 0.242

= 9.956 rounded off to three decimal places

= 0.500

Therefore, the Rankine active coefficient for an angle of internal friction of 45 degrees is 0.500.

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Answer:

d. Is indicated when a magnetometer measures intervals of magnetism that are weaker than expected

Explanation:

Magnetic field intensity is measured with a magnetometer on the surface of the Earth. Areas in which the magnetic field strength is lower or more than average are known as areas with magnetic anomalies, which may be due to  the presence of rocks that have a different magnetic characteristics

Where the magnetic anomaly is negative, it is indicative of a magnetic field strength reading that is lower than average magnetic field which is generally obtainable

Therefore, the correct option is indicated when a magnetometer measures intervals of magnetism that are weaker than expected

Answer:

sẽ càng lớn

Explanation:

The force on an electron due to a magnetic field can be calculated using the formula F = qvB, where F is the force, q is the charge of the electron, v is the velocity of the electron, and B is the magnitude of the magnetic field.

Given:

Charge of the electron (q) = 1.60218 x 10^-19 C

Mass of the electron (m) = 9.10939 x 10^-31 kg

Magnitude of the magnetic field (B) = 0.259 T

To find the force on the electron, we need to determine the velocity of the electron after it has been accelerated across the potential difference.

The potential difference (V) is given as 82300 V, which can be used to calculate the final kinetic energy of the electron using the equation:

qV = (1/2)mv^2

Solving for v, we have:

v = sqrt((2qV)/m)

Substituting the given values, we find:

v = sqrt((2 * 1.60218 x 10^-19 C * 82300 V) / (9.10939 x 10^-31 kg))

v ≈ 5.47 x 10^6 m/s

Now, we can calculate the force on the electron due to the magnetic field:

F = qvB

Substituting the values, we get:

F = (1.60218 x 10^-19 C) * (5.47 x 10^6 m/s) * (0.259 T)

F ≈ 2.244 x 10^-15 N

Therefore, the force on the electron due to the magnetic field is approximately 2.244 x 10^-15 N.

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Answer:

(b) 2

Explanation: