the middle-c hammer of a piano hits two strings, producing beats of 1.25 hz. one of the strings is turned to 240.00 hz. what frequencies (in hz) could the other string have? (answer to the nearest 0.1 hz.)

A proton and an electron in a hydrogen atom are separated on the average by about 4.8x10-11 m. The magnitude and direction of the electric field set up by the proton at the position of the electron is (E)=  6.24×10¹¹ N/C.

The electric field is a field that is created by any positive or negative charge. In an atom the electron or proton that creates a field that called the electric field.

To calculate the electric field we are using the formula here ,

E= k(q/r²)

Where we are given,

k= The Coulomb's constant . = 8.99 ×10⁹ N.m²/C²

q= The charge of the electron. = 1.6×10⁻¹⁹ C

r= The distance of separation of atom. = 4.8×10⁻¹¹ m.

We have to calculate the electric field of the atom. = E

Now we put the values we get,

E= k(q/r²)

Or, E=  8.99 ×10⁹×(1.6×10⁻¹⁹/(4.8×10⁻¹¹)²)

Or, E=  6.24×10¹¹ N/C

Now we can say that, The magnitude and direction of the electric field set up by the proton at the position of the electron is (E)=  6.24×10¹¹ N/C.

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Answer:

please help

Explanation:

Answer:1342

Explanation:

Answer:

its c

Explanation:

Answer:

Mass, m = 816.33kg

Explanation:

Weight can be defined as the force acting on a body or an object as a result of gravity.

Mathematically, \( Weight, W = mg\)

Where;

Making mass, m the subject of formula, we have;

\( Mass, m = \frac {W}{g} \)

Given the following data;

Weight = 8000N

We know acceleration due to gravity is equal to 9.8 m/s²

Substituting into the equation, we have;

\( Mass, m = \frac {8000}{9.8} \)

Mass, m = 816.33kg

Therefore, the mass of the elevator is 816.33kg.

We define acceleration as the rate of change of the velocity

Thus, if you have positive velocity and positive acceleration, your speed increases.

If you have positive velocity and negative acceleration, your speed decreases.

Now you get the idea, we will see that the correct option is graph 1.

We know that the car moves towards the right (let's define this as "the car has positive velocity") and we also know that te car is slowing down constantly (thus the acceleration needs to be negative and constant).

By looking at the graphs, the only one with these properties is graph 1.

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I think its D answer

sorry I dont have explanation but I think its D

When the pressure inside the star exceeds its temperature, the star is no longer able to sustain its current size and temperature.

This causes the star to expand and become a red giant, which is a large, cool star with a much lower surface temperature than its original state.

The universe is filled with a multitude of stars. However, these stars are constantly in a state of flux, and in some cases, they can experience a dramatic transformation. When the pressure inside a star exceeds its temperature, the star is no longer able to sustain its current size and temperature, and as a result, it expands and turns into a red giant.

A red giant is a large, cool star with a much lower surface temperature than its original state. This transformation is due to the fact that the star has used up much of its hydrogen, which has been converted to helium. This conversion of hydrogen to helium is what causes the star to expand, as the helium is unable to produce enough energy to keep the star from expanding.

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The charge on the individual ring is dq = σ * 2πr * dr.

A thin-walled hollow circular glass tube, open at both ends and centered on the origin along the z-axis, is negatively charged uniformly on its outer surface.

To determine the electric field it produces at a location a distance 'r' away from the tube, we can divide the tube into rings of thickness 'dr'. Each individual ring possesses charge 'dq'.

To find the charge on a single ring, we can consider an elemental ring with radius 'r' and thickness 'dr'. The charge on this ring can be calculated by multiplying the charge density (σ), which is the charge per unit area, by the area of the ring (dA).

The area of the ring is given by dA = 2πr * dr. Multiplying this by the charge density, we obtain dq = σ * dA = σ * 2πr * dr.

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Answer:

i think its  c

Explanation:

Answer:

The magnetic effect of electric current is known as electromagnetic effect. :)

Explanation:

the magnetic effect which is connected with electricity is called magnetic effect of current.

Answer:

Antibody molecules that are secreted by plasma cells mediate the humoral immune response. The antigen that binds to the receptor of the B-cell antigen signals B cells and is internalized and transformed into peptides that activate the armed helper at the same time.

Explanation:

Answer:

B cells

Explanation:

Humoral immunity or humoural immunity is the aspect of immunity that is mediated by macromolecules found in extracellular fluids such as secreted antibodies, complement proteins, and certain antimicrobial peptides. Humoral immunity is named so because it involves substances found in the humors, or body fluids. It contrasts with cell-mediated immunity. Humoral immunity is also referred to as antibody-mediated immunity.

Answer: 0.3m

Explanation:

Given the following :

Speed of radio wave(V) = 3 × 10^8 m/s

If 1M = 10^6

Frequency(F) = 90MHz = 90 × 10^6

Wavelength (λ) =?

Speed of wave (V) = frequency(F) × wavelength(λ)

V = fλ

(3 × 10^8) = (90 × 10^6) × λ

λ = (90 × 10^6) / (3 × 10^8)

λ = 30 × 10^(6 - 8)

λ = 30 × 10^-2

λ = 0.3m

Answer:

chargeing by induction

Explanation:

this is the answer have a great day

The maximum velocity of the object is 0.0272 m/s, and the kinetic energy it has at that point is 3.76 × 10⁻⁶ J.

The maximum velocity of the object and the amount of kinetic energy it has at that point can be found using the given values. Here's the step-by-step solution: Given data: Mass of the object, m = 0.0100 kg Force constant of the spring, k = 1.3 N/m Displacement of the object, d = 3.00 cm = 0.0300 m We know that the maximum velocity of the object can be determined using the following formula: v = ±√(2K/m)where, K = Potential Energy and m = mass of the object. The potential energy of the system can be obtained using Hooke's law.

According to Hooke's law, F = -k x Where, F = restoring force k = force constant x = displacement of the object from the equilibrium position. By using the above formula, we can find the force acting on the object. F = k x'. Force acting on the object, F = 1.3 N/m × 0.0300 m = 0.039 N. The restoring force is acting in the opposite direction of the displacement of the object. So, the force acting on the object is negative, i.e., F = -0.039 N. Now, we can calculate the potential energy of the system. K = (1/2)kx²K = (1/2) × 1.3 N/m × (0.0300 m)²K = 5.85 × 10⁻⁵ J By using the above value of potential energy and mass of the object, we can calculate the maximum velocity of the object. v = ±√(2K/m)v = ±√[(2 × 5.85 × 10⁻⁵ J) / 0.0100 kg]v = ±0.0272 m/s.

The maximum velocity of the object is 0.0272 m/s (rounded off to four significant figures).Now, we can calculate the amount of kinetic energy the object has at that point by using the following formula. Kinetic energy, K = (1/2)mv²where m = 0.0100 kg and v = 0.0272 m/s K = (1/2) × 0.0100 kg × (0.0272 m/s)²K = 3.76 × 10⁻⁶ J. The amount of kinetic energy the object has at its maximum velocity is 3.76 × 10⁻⁶ J (rounded off to three significant figures).So, the maximum velocity of the object is 0.0272 m/s, and the kinetic energy it has at that point is 3.76 × 10⁻⁶ J.

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The large, knob-like treads on mountain bike tires are useful on steep slopes because they increase friction. Correct choice is option A.

As a mountain bike travels on a steep slope, the tires need to provide sufficient friction to maintain control and prevent slipping. The large, knob-like treads on mountain bike tires increase the surface area of the tire that comes into contact with the ground, which increases the friction between the tire and the ground. This increased friction allows the rider to maintain better control of the bike and avoid slipping or sliding down the slope.

The other options presented are not accurate because mountain bike tires with large, knob-like treads are not designed to carry heavy weights or prevent braking of the bicycle. In fact, the large treads can increase the stopping distance of the bike because they can create more rolling resistance, requiring the rider to apply more force to the brakes to come to a stop. Option A is correct.

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At a depth of approximately 5.27 mm in the powder bed, the pressure in the cylinder will be 4/10 the pressure at the punch.

To calculate the depth at which the pressure in a straight cylinder compact with a diameter of 15 mm will be 4/10 the pressure at the punch, we can use the Kawakita equation, which relates the pressure at any depth in the powder bed to the pressure at the punch.

The equation is given by: P/P0 = (1 - \(e^{(-kh)}\)) / (kh), where P0 is the pressure at the punch, P is the pressure at a depth h in the powder bed, and k is the Kawakita constant.

Substituting k = 0.4 and P/P0 = 4/10, we get: 0.4h / (1 - \(e^{(-0.4h)}\)) = 0.4

Solving for h numerically, we find that h ≈ 5.27 mm. Therefore, at a depth of approximately 5.27 mm in the powder bed, the pressure in the cylinder will be 4/10 the pressure at the punch.

This result indicates that the powder bed is relatively dense and that the compaction process has been effective in reducing the void space between particles.

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The ph of water is 7.27 and the solution will be neutral.

By the formula:

Kw= \([H^{+} ][OH^{-} ]\)

Kw= 0.29 x 10^-14

PKw= PH+POH

PKw =14.53

At neutrality, \([H^{+} ]=[OH^{-} ]\) and

PH=POH

2PH=14.53

PH=7.27

Thus, the pH will be 7.27 and the solution will be neutral.

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Answer:

Conduction, convection, and radiation

Explanation:

Conduction is the process in which energy is transferred from a hot body to a cooler body. Convection is a process by which heat is transferred as a result of the movement of heated fluid in the form of air or water. Radiation refers to the transmission of energy through a material medium.

Based on the information provided, a lava lamp could be used to provide an example of conduction, convection, and radiation.

Answer:

A đến B. Vật thứ nhất chuyển động đều từ A với vận tốc 36km/h.

Explanation:

X has a magnitude of around 1.11.

The cosine and sine of a vector's direction angle can be used to calculate the scalar x-component, while the magnitude and cosine of the vector's direction angle can be used to calculate the scalar y-component.

By multiplying the first equation by (4+j5) and the second equation by (3+j4) and adding the resulting equations, we can use the method of elimination to solve this system of equations:

(3+j4)(4-j5)x + (3+j4)(4+j5)y = (18+j13)(3+j4)

(4-j2)(3+j4)x - (4+j5)(3+j4)y = (-5+j10)(4+j5)

Simplifying, we get:

53x + 47y = 78 + 43j

10x - 29y = 15 - 37j

By multiplying the first equation by 29 and the second equation by 47, then removing, we may eliminate y and arrive at the solution for x:

1537x = 1695 - 1150j

Therefore, x = (1695 - 1150j)/1537.

To find the magnitude of x, we calculate the absolute value:

|x| = |(1695 - 1150j)/1537| = √((1695/1537)² + (-1150/1537)²) = 1.11

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Answer:

see below

Explanation:

a wave means one complete wave which is 1 period

so a) 5 complete waves

wavelength is the shortest distance between any two points in phase

so wavelength = 1 CM

amplitude of a wave is the maximum displacement of a particle from its rest position

so amplitude = 3 CM

hope this helps

We have that for the Question, it can be said that the amount by which the length of the stack decreases is

From the question we are told

A copper (Young's modulus 1.1 x 1011 N/m2) cylinder and a brass (Young's modulus 9.0 x 1010 N/m2) cylinder are stacked end to end, as in the drawing. Each cylinder has a radius of 0.24 cm.

A compressive force of F = 7900 N is applied to the right end of the brass cylinder. Find the amount by which the length of the stack decreases.

Generally the equation for copper cylinder   is mathematically given as

\(dl=\frac{Flo}{yA}\)

\(dl=\frac{7900*3*10^-^2}{1.1*10^{11}*\pi(0.24*10^{-2})^2}\)

\(dl=1.19064778*10^-^4\)

Generally the equation for brass cylinder   is mathematically given as

\(dl=\frac{7900*5*10^-^2}{9*10^{10}*\pi(0.24*10^{-2})^2}\)

\(dl=2.43*10^{-4}\)

Therefore Total change in length

\(dl'=1.191*10^-^4+(2.43*10^{-4})\)

\(dl'=3.621*10^{-4}m\)

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According to the question the length of the coil is (0.004719 × 1).

Length is a measurement of the distance between two points. It can refer to a physical distance, such as the length of a road or the length of a desk, or it can refer to a temporal distance, such as the length of a movie or the length of a song. Length is usually measured in units such as meters, kilometers, or feet, and can also be measured in time units such as seconds, minutes, or hours. In mathematics, length is also used to describe the size of a line, curve, or circle.

Assuming the magnetic field is uniform throughout the coil and that the current induced in the coil is directly proportional to the field strength, the number of turns in the coil can be calculated using the formula:

N = (V × B) / 4πf

Where:

N = number of turns

V = voltage of the flashlight bulb (3 V)

B = maximum field strength of the magnet (0.05 T)

f = frequency of the magnet moving through the coil (assume to be 1 Hz)

Therefore, the number of turns in the coil is:

N = (3 × 0.05) / (4π × 1) = 0.004719 turns

Assuming the coil is made from copper wire with a cross-sectional area of 1 mm2, the length of the coil is given by the formula:

L = N × A / π

Where:

L = length of the coil

N = number of turns in the coil (0.004719)

A = cross-sectional area of the wire (1 mm2)

Therefore, the length of the coil is:

L = (0.004719 × 1)

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Answer:

I think the answer 1

Explanation:

im probably wrong too i dont know

Answer:

B

Explanation:

cannot be effectively tested

The effectiveness of biofeedback has been a subject of controversy because biofeedback cannot be effectively tested.

What is biofeedback therapy?

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Answer:

Speed and direction affect pitch.

Answer:

The correct answer is B. Speed and Direction affect pitch

Explanation:

The Doppler effect, a quantitative analysis that demonstrates how the repetition heard by the stable perceiver depends on whether the perceiver sees the source approach, causes sound and light waves to increase and decrease in frequency due to the proportional motion between the wave source and its receivers. Accordingly, when the wave source is moving, waves are perceived at frequencies that are different from one another.

I know I'm answering a little later, but this will help any people in the future.

Please 5 star and say thx ty and hopes this helps

Answer:

magnet b

Explanation:

because it has a stronger current so it attracts more paper clips