a student in a band notices that a drum vibrates when another instrument emits a certain frequency note. this phenomenon illustrates

Answer:

The direction of an electric field is determined from the behavior of a positive test charge that is set free in the electric field.This charge moves along a distinct vector showing the direction of the electric field  Therefore the answer is b. a positive charge will move in the field.

Explanation:

The direction of the force is from the positive charge of an electric field.

The answer would be positive test charge.

The types of radiation, ranked in order of their energy from least to greatest are:

It's important to note that these types of radiation form a continuous spectrum, with the boundaries between each type of radiation being somewhat arbitrary. The amount of energy in a particular type of radiation depends on its frequency or wavelength. In general, radiation with higher frequency or shorter wavelength has more energy than radiation with lower frequency or longer wavelength.

Radiation refers to the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles that cause ionization.

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Answer:

the answer is A. 4 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms

The number of atoms of each molecule of the reactants is required.

The correct option is c. 1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms

The given reaction is

\(CH_4+2O_2\rightarrow CO_2+2H_2O\)

For carbon atoms

The only carbon atom is present in \(CH_4\)

So, 1 carbon atom

The hydrogen atoms are also present is \(CH_4\)

There are 4 hydrogen atoms.

The oxygen atoms present is \(2\times 2=4\)

So, the number of atoms present in the reactants are c. 1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms

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To determine the amount of energy stored in the bow at full extension (0.5 m), or E-bow,

1. First, collect data points of force and extension (distance) for the bowstring. Ensure you have more than 3 or 4 data points for a better estimate.

2. Plot the force vs. extension data points on a graph.

3. Calculate the area under the curve of the force vs. extension graph up to the full extension (0.5 m).

The area under the curve represents the work done on the bowstring and is equal to the energy stored in the bent bow (E-bow).

4. You can find the area under the curve using various methods, such as numerical integration, trapezoidal rule, or Simpson's rule, depending on the data points' distribution and the required accuracy.

Once you've calculated the area under the curve, that value will represent the amount of energy stored in the bow at full extension (0.5 m), which is E-bow.

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If you placed a radio in a bell jar and removed all the air  the sound can not propagate, we can not hear the sound and  speaker will not move.

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Answer:

an iron nail near a magnet

Solar energy is created by nuclear fusion that takes place in the sun. Fusion occurs when protons of hydrogen atoms violently collide in the sun's core and fuse to create a helium atom.

The statement "two people share the same reference frame" in relativity is only true if they are both at rest relative to each other or moving with constant velocity relative to each other. This is known as the principle of relativity and is a fundamental concept in Einstein's theory of special relativity.

The principle of relativity states that the laws of physics are the same for all observers in uniform motion relative to one another. This means that if two people are moving with constant velocity relative to each other, they will see the same physical phenomena and make the same measurements, regardless of their relative motion. They are said to share the same reference frame.

However, if one person is accelerating, their measurements will be different from those of a person who is at rest or moving with constant velocity. This is because acceleration introduces additional forces and changes the observer's perspective on the physical phenomena they are observing.

Therefore, in order for two people to share the same reference frame in relativity, they must be at rest relative to each other or moving with constant velocity relative to each other.

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Answer:

The dependent variable

Explanation:

This is because this variable depends on what happens during the experiment.

Answer:

C

Explanation:

The m dot = 1A1v1 = (821 kg/m3)(0.618 m2)(2.117 m/s) 1077 kg/s is the flow rate of the oil.

fluid moving through a horizontal pipe P1 + ½ρv12 = P2 + ½ρv22. The pressure will depend on the fluid's speed if it is flowing frictionlessly through a horizontal pipe with a variable cross-sectional area as a liquid (or a gas that is not being compressed).

The fluid's velocity and cross-sectional area before and after the pipe's constriction can be compared using the continuity concept.

ρ1A1v1 = ρ2A2v

Moreover, we may link the fluid's pressure and velocity before and after the constriction using Bernoulli's equation:

P1 + 1/2ρ1v1² = P2 + 1/2ρ2v2²

v2 = (ρ1/ρ2) × (A1/A2) × v1

P1 + 1/2ρ1v1² = P2 + 1/2ρ1(A1/A2)²(v1)²

Solving for v1, we get:

v1 = sqrt(2(P1 - P2)/ρ1(1 - (A1/A2)²))

v1 = sqrt(2(7980 - 5985)/(821)(1 - (0.618/0.223)^2)) = 2.117 m/s.

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The electric flux that passes through the sloping side surface area of the cone is 6.36 N m² / C.

We have,

To calculate the electric flux passing through the sloping side surface area of the cone, we can use Gauss's law for electric flux, which states:

Φ = E * A * cos(θ),

where:

Φ is the electric flux.

E is the magnitude of the electric field.

A is the area through which the flux passes.

θ is the angle between the electric field and the normal to the area.

Given:

Magnitude of electric field (E) = 4550 N/C.

Height of the cone (h) = 18.5 cm = 0.185 m.

Diameter of the cone (d) = 4.22 cm = 0.0422 m.

We need to find the angle θ between the electric field and the normal to the slant surface of the cone.

Since the cone is resting on the tabletop with its face horizontal, the electric field is vertical, and the normal to the slant surface is inclined.

First, let's calculate the slant height (l) of the cone using the Pythagorean theorem:

l² = h² + (d/2)²,

l = √(h² + (d/2)²).

l = √ (0.034 + 0.00045)

l = √0.0344

l = 0.1854

Now, calculate the cosine of the angle θ:

cos(θ) = (d/2) / l.

Next, calculate the area (A) of the sloping side surface of the cone using the formula for the lateral surface area of a cone:

A = π * r * l,

where r is the radius of the base of the cone.

Given: r = d/2.

Now, we can calculate the electric flux:

Φ = E * A * cos(θ),

= 4550 N/C * π * (d/2) * l * (d/2) / l

= 4550 x 3.14 x 0.0211 x 0.1854 x 0.0211/0.1854

= 6.36 N m² / C

Thus,

The electric flux that passes through the sloping side surface area of the cone is 6.36 N m² / C.

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Answer:

Ballon B's electric field would be directed away from Balloon A since B exerts a repulsive force on A. Balloon B would also have a negative charge, since like charges repel one another.

Explanation:

The electric field created by Balloon B will be directed away from Balloon A.

The direction of electric field is always opposite to the direction of negative charge.

The electric field created will be directed opposite to the negative charge of balloon A.

Thus, the complete sentence will be, "the electric field created by Balloon B will be directed away from Balloon A.

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Answer:

thanks me later

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Answer:

\(a=0.1\ m/s^2\)

Explanation:

Given that,

Initial velocity, u = 0

Final velocity, v = 2 m/s

Time, t = 20 s

We need to find the acceleration of the swimmer. The acceleration of an object is equal to the change in velocity per unit time. It can be given by :

\(a=\dfrac{v-u}{t}\\\\a=\dfrac{2\ m/s}{20\ s}\\\\a=0.1\ m/s^2\)

So, her average acceleration of the swimmer is \(0.1\ m/s^2\).

When the velocity of a particle moving along an axis is known, the instantaneous acceleration equal to zero is given as 0.6t.

We estimate the average speed between two places in time separated by t while allowing t to decrease. The outcome is the velocity function's derivative, v. (t).

The slope of the tangent line to the graph at any given location on the graph corresponds to the instantaneous acceleration there. The instantaneous acceleration of the particle is equal to 0 when this line is horizontal and has a slope of 0. According to the plot, these times correlate to the velocity function's extrema, which can be found at t = 1.75, 2.75, 3.25, and for all t = 4.

t = 0.6 is the most likely choice.

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Answer:

On an air hockey table, when the table is on, pucks glide freely when hit. When the table is off, pucks do not travel as far when hit. Explain in as much detail as you can why this occurs and what allows this to occur, using Newton’s 1st Law.

Newton's 1st Law, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity unless acted upon by an unbalanced force.

In the case of an air hockey table, the air flow created by the table's motor serves as the unbalanced force that affects the movement of the puck. When the table is on, the motor creates a cushion of air that flows across the surface of the table, allowing the puck to glide freely with little resistance. This air flow reduces the friction between the puck and the table, allowing the puck to travel farther when hit.

However, when the table is turned off, there is no longer a cushion of air to reduce friction between the puck and the table. This increased friction slows down the puck more quickly, causing it to travel a shorter distance when hit. The puck is also more likely to come to a complete stop when it reaches the edges of the table, as the lack of air flow makes it more difficult for the puck to bounce off the table's walls.

In summary, the air flow created by the motor on an air hockey table serves as an unbalanced force that reduces friction and allows the puck to travel farther. Without this air flow, the increased friction between the puck and the table causes the puck to slow down more quickly, resulting in shorter travel distances and a higher likelihood of coming to a complete stop.

1- Standing Wave Ratio (SWR) is a measure of how efficiently power is transferred between a transmission line and a load.

It is defined as the ratio of the maximum amplitude of the standing wave pattern to the minimum amplitude, which occurs at the point of minimum impedance.

2-To measure SWR in dB, a power meter is connected to the transmission line and the forward power and reflected power are measured. The SWR is then calculated by dividing the maximum power (forward + reflected) by the minimum power (forward - reflected), and the result is expressed in dB using the formula SWR(dB) = 20 log (SWR).

3-The reflection coefficient (Γ) is a measure of how much of the incident wave is reflected at the point of impedance mismatch. The SWR is related to the reflection coefficient by the formula SWR = (1 + |Γ|) / (1 - |Γ|), where |Γ| is the magnitude of the reflection coefficient. As the reflection coefficient approaches zero (i.e. a perfect match), the SWR approaches 1 (i.e. perfect transfer of power).

4-Given that the load is a 3-dB attenuator terminated by a short circuit, the reflection coefficient can be calculated as Γ = (Z_L - Z_0) / (Z_L + Z_0), where Z_L is the impedance of the load (in this case, 2Z_0 due to the 3-dB attenuator) and Z_0 is the characteristic impedance of the waveguide.

Substituting values, we get Γ = (2Z_0 - Z_0) / (2Z_0 + Z_0) = 1/3. The SWR can then be calculated using the formula SWR = (1 + |Γ|) / (1 - |Γ|) = (1 + 1/3) / (1 - 1/3) = 4/1. Therefore, the SWR in dB is SWR(dB) = 20 log (4/1) = 12 dB.

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Answer:

Ask a question.

Explanation:

Your question is the basis of any theory.

A 19-cm-long nichrome wire is connected across the terminals of a 1.5 V battery. If the current in the wire is 2.2 A, ,The diameter of the nichrome wire is approximately 0.33 mm.

To calculate the diameter of the wire, we can use the formula for the cross-sectional area of a wire:\(A = πr^2\), where r is the radius of the wire. We know the length of the wire (19 cm), the current through it (2.2 A), and the voltage across it (1.5 V). Using Ohm's law (V = IR), we can calculate the resistance of the wire: R = V/I = 1.5/2.2 = 0.68 ohms. We can then use the formula for the resistance of a wire: R = ρL/A, where ρ is the resistivity of the wire material and L is the length of the wire. For nichrome wire, the resistivity is about \(1.10 × 10^-6\) ohm-m. Substituting in the values we know and solving for A, we find that\(A ≈ 2.83 × 10^-7 m^2\). Finally, we can solve for the radius of the wire: r = sqrt(A/π) ≈ 0.000165 m, or 0.33 mm when multiplied by 2.

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The work required to stop the car is 23,756 J

The work required to stop a car is equal to the amount of energy that the car has due to its motion. This energy is called the kinetic energy of the car. The kinetic energy of a car is calculated as the product of the mass of the car and the square of its velocity.

kinetic energy = 1/2 * mass * velocity²

The mass of the car is 1,168 kg and the velocity of the car is 24 km/hr. We will first need to convert the velocity from km/hr to m/s. To do this, we will multiply the velocity by 5/18. So, the velocity of the car is 24 * 5/18 = 6.667 m/s.

We can now calculate the kinetic energy of the car as follows:

kinetic energy = 1/2 * 1,168 * 6.667² = 23,756 J

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A linear spring of stiffness k is designed to stop the 20-mg railroad car traveling at 8 km/h within 400mm after impact. the value of the smallest k that will produce the desired result is given by 0.022 / x².

Given,

Mass of the railroad car (m) = 20 mg = 0.02 kg

Initial velocity of the railroad car (u) = 8 km/h = (8 × 1000) / 3600 m/s = 2.22 m/s

Displacement (s) = 400 mm = 0.4 m

Using the formula of Kinetic Energy (K.E.),we get,

K.E. = 1/2 mv²

The energy required to stop the car is equal to its kinetic energy at that moment i.e.,

K.E. = 1/2 mv² = 1/2 × 0.02 × (2.22)²= 0.022 KJ

Work done by the spring (W) is given by

W = F × s

where, F = Force applied by the spring at a distance s from its natural length.

The spring force is directly proportional to its extension.

Therefore,

F = k × xwhere,k = Spring constantx = Extension in the length of the spring

Let us assume that the spring has moved an extension of x during this process of stopping the car, and k is the required spring constant.

Therefore,

W = kx² / 2

Equating the Work done by the spring and the kinetic energy of the railroad car,

kx² / 2 = 1/2 × 0.02 × (2.22)²kx² = 0.022k = 0.022 / x²

Hence, the value of the smallest k that will produce the desired result is given by 0.022 / x².

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It takes approximately 0.1 seconds for a sound to reach a person in the middle row of the auditorium after reflecting off the back wall.

To calculate the time delay between the direct and reflected sound, we need to first calculate the distance the sound travels in each case.

For the direct sound, the distance traveled is simply the distance from the stage to the middle row, which is half the total distance to the back wall:

d_direct = 23.0 m / 2 = 11.5 m

For the reflected sound, the sound wave must travel from the stage to the back wall and then reflect off the wall and travel to the middle row. The total distance traveled by the reflected sound is twice the distance from the stage to the back wall:

d_reflected = 2 × 23.0 m = 46.0 m

Now, we can use the formula:

time = distance/speed

to calculate the time taken for the sound to travel each distance.

For the direct sound, we have:

time_direct = d_direct / speed of sound = 11.5 m / 343 m/s ≈ 0.034 seconds

For the reflected sound, we have:

time_reflected = d_reflected / speed of sound = 46.0 m / 343 m/s ≈ 0.134 seconds

Therefore, the time delay between the direct and reflected sound is:

time_delay = time_reflected - time_direct = 0.134 seconds - 0.034 seconds = 0.1 seconds

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The speed of the petunia rolls is obtained from the calculation as 12.8 Km/hr.

The term speed is the ratio of the distance to the time that is taken by a body. We know that speed is how we would know how fast or slow that a material is moving and the unit that we can use to measure the speed of an object is kilometers per hour.

Distance covered by the object = 16Km

Time taken by the object = 1.25hrs

Speed = Distance/ Time

Speed =  16Km/ 1.25hrs

= 12.8 Km/hr

The speed is 12.8 Km/hr.

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Answer: b is sedimentary. c is metamorphic. and a is igneous.

Explanation:

We can determine the direction of the electric field. The force on the small ball is in the -x direction, which means the electric field must also be in the -x direction. Therefore, the direction of the electric field is -x.

Based on the information given, we know that a set of charges is creating a force of 5.0x10-15 N in the -x direction on a small -25 ball. This force is caused by the electric field created by the charges.
To find the strength and direction of the electric field, we can use the formula:
Electric field strength (E) = Force (F) / Charge (q)
We know the force (F) is 5.0x10-15 N, but we don't know the charge (q) on the small ball. Therefore, we cannot calculate the exact strength of the electric field.

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Answer:

Saturn's differential rotation will cause the length of a day measures to be longer by 0.4 hours

Explanation:

Differential rotation occurs due to the difference in angular velocities of an object as we move along the latitude of the or as we move into different depth of the object, indicating the observed object is in a fluid form

Saturn made almost completely of gas and has differential motion given as follows

Rotation at the equator = 10 hours 14 minutes

Rotation at high altitude = 10 hours 38 minutes

Therefore;

The differential rotation = 10 hours 38 minutes - 10 hours 14 minutes

The differential rotation = 24 minutes = 24 minutes × 1 hour/(60 minutes) = 0.4 hours

The differential rotation = 0.4 hours

Therefore, the measured day at the higher altitude will be 0.4 longer than at the equator.