Which of the following is a vector quantity?
A. 30 miles
B. 30 mph northwest
C. 55 m/s
D. 20 mph

The bat, moving at 0.025 times the speed of sound in air, will hear a frequency of 38,887.5 Hz reflected off the wall.

The frequency of sound heard by an observer is affected by the relative motion between the source of the sound and the observer. In this case, the bat is moving towards the wall, which causes a Doppler shift in the frequency of the reflected sound.

The formula for the Doppler shift in frequency is given by:

f' = f(v + vr) / (v + vs)

where f' is the observed frequency, f is the emitted frequency, v is the speed of sound, vr is the velocity of the observer (bat), and vs is the velocity of the source (wall).

Given that f = 39,000 Hz, v = 343 m/s, vr = 0.025 * v, and vs = 0 (since the wall is stationary), we can substitute these values into the formula:

f' = 39,000 * (343 + 0.025 * 343) / (343 + 0)

f' = 39,000 * 1.025 / 1

f' = 39,877.5 Hz

Therefore, the bat will hear a frequency of approximately 38,887.5 Hz (rounded to the nearest hundredth) reflected off the wall.

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Explanation:

a) What is the weight of the crate?

W = m*g = 60 kg *9.81 m/s^2 = 588.6 N

Sum of the forces in the vertical direction on the box (up is +) = F - W = 500 N - 588.6 N = -88.6 N

Since the forces do not add up to 0, then there is a net force on the crate which will cause the crate to accelerate.

b) F = m*a ==> a = F/m

a = -88.6 N / 60 kg = -1.48 m/s^2 (- means down since above we declared up as +)

c) Assume it starts from rest, vi = 0 m/s

Equation of motion in the vertical direction

h = h0 + v0*t + 1/2*a*t^2

h0 = 1.4 m

h = 0 m

v0 = 0 m/s

a = -1.48 m/s^2

0 = 1.4 m + 0 - 1/2* 1.48 m/s^2 * t^2

1.4 m = 1/2 * 1.48 m/s^2 * t^2

t = 1.38 s

d) vf = vi + a*t

vi = 0 m/s

vf = a*t = -1.48 m/s^2 * 1.38 s = -2.04 m/s

Answer:

the answer for how much work was done is 90

Work done to push a box is 150 J.

force= 30N

displacement= 5 meters.

work done= 30 * 5

               ⇒ 150 joule.

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Answer:

D

Explanation: That is the lowest point in a cycle

Answer:

I just had a question the same as this.

The answer is: Points (B) & (F)!

Hope it helps! :D

Answer:

Number of Significant Figures: 3

The Significant Figures are 3 0 5

This is because the three zeros are considered trailing zeros because they're not between two numbers or after. Zeros attached to the beginning of a number in this way are called leading zeros. In decimals, this idea of zeros that don't add value to a number can be extended to trailing zeros. A trailing zero is any zero that appears to the right of both the decimal point and every digit other than zero.

Explanation:

Trailing zeros (zeros after non-zero numbers) in a number without a decimal are generally not significant (see below for more details). For example, 400 has only one significant figure (4). The trailing zeros do not count as significant. Trailing zeros in a number containing a decimal point are significant.

Pption d. flow does not independently influence the speed of water in a stream. Instead, it is an outcome determined by the combined effects of gradient, discharge, and channel geometry.

The flow itself, or the rate at which water moves in a stream, is not an independent factor that influences the speed of water in a stream. Instead, it is a result of other factors such as gradient, discharge, and channel geometry.

a. Gradient: The gradient, or slope, of the stream affects the speed of water. Steeper gradients generally lead to faster-flowing water.

b. Discharge: The discharge of a stream, which refers to the volume of water passing through a given point in a specified amount of time, directly affects the speed of water. Higher discharge results in faster flow.

c. Channel geometry: The shape and dimensions of the stream channel also influence the speed of water. Wider and deeper channels tend to have slower flow, while narrower and shallower channels often lead to faster flow.

Therefore, option d. flow does not independently influence the speed of water in a stream. Instead, it is an outcome determined by the combined effects of gradient, discharge, and channel geometry.

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The acceleration of the object is approximately 2.38 m/s². To find the acceleration of the object, we can use the formula:

acceleration = change in velocity / time

The object goes from rest to a speed of 10 m/s in 4.2 seconds, the change in velocity is:

change in velocity = final velocity - initial velocity

change in velocity = 10 m/s - 0 m/s

change in velocity = 10 m/s

Plugging the values into the formula, we have:

acceleration = change in velocity / time

acceleration = 10 m/s / 4.2 s

acceleration ≈ 2.38 m/s²

Therefore, the acceleration of the object is approximately 2.38 m/s².

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Answer:

W = 210 N

Explanation:

For an ideal machine:

\(Work\ In = Work\ Out\\(P)(L)=(W)(H)\)

where,

P = Effort = Spring Scale Reading = 70 N

L = Effort Arm = Length of inclined plane = 12 m

W = Actual Load (Weight) to be lifted = ?

H = Load Arm = Height = 4 m

Therefore,

\((70\ N)(12\ m) = (W)(4\ m)\\\\W = \frac{(70\ N)(12\ m)}{4\ m}\)

W = 210 N

The light intensity from  largest to smallest ranking will be  :B > D > A=C > E. where the area is measured on the plane perpendicular to the direction .

In physics, the intensity is the amount of energy that is transmitted per unit area, and the area is measured on a plane perpendicular to the direction that the energy equation will propagate. I = P/ 4(d2), with P denoting power. Let power of 1 bulb equal = P where I = intensity, d = distance at which the intensity must be determined.

case A = I =  P / (1) (1) 1 = P case with 2 = P In the situation B = I = 2P/(0.5)2 = 8P C = I = 4P / (2) (2) ^2 = P case Case (1)2 = 3P: D = I = 3P E = I = 2P /(1.5) (1.5) ^2 = 0.8 P

B > D > A=C > E will be the order of light intensity, from greatest to least.

rank the light intensity, from largest to smallest, at the point p in the figures?

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Solar-driven heat engines that extract electrical power from thermal radiation are called thermoelectric generators (TEGs).

Thermoelectric generators (TEGs) are devices that can convert thermal energy directly into electrical energy using a phenomenon known as the Seebeck effect. It converts the temperature difference between two metals or semiconductors into an electrical voltage.

The process used by thermoelectric generators is based on the thermoelectric effect, which is a combination of thermal and electrical phenomena.

Thermoelectric generators (TEGs) are widely used in remote power applications and waste heat recovery because they are compact, reliable, and maintenance-free. They are ideal for use in situations where maintenance is challenging, such as in remote locations or where there are no alternative power sources available.

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#1

W and Y

Y has 6electrons-->2electrons to complete octet.

W has 2electrons-->6electrons to complete octet.

#2

Z and V

V needs 7electrons to complete octet.

Z needs 1 electron to complete octet.

W and Y, Y has 6electrons-->2electrons to complete octet. W has 2 electrons --> 6 electrons to complete the octet. Z and V, V needs 7 electrons to complete the octet. Z needs 1 electron to complete the octet.

A covalent bond is formed when two atoms exchange one or more pairs of electrons. The two atomic nuclei are concurrently drawing these electrons to them. The sharing of electron pairs between atoms occurs in covalent bonds.

In contrast to polar covalent bonds, which are formed when electrons are exchanged between atoms with uneven electronegativity, electron pairs shared between atoms with equal or very similar electronegativity form nonpolar covalent bonds, such as H-H or C-H. (e.g., H–O).

Therefore, when the difference between the electronegativities of two atoms is too tiny for an electron transfer to take place to create ions, a covalent bond is formed.

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The Coulomb's law equation is  F = Kq₁q₂/r².

This is the law that relates the product of two charges to the square of distance between the two charges.

Coulomb's law states that the force of attraction or repulsion is directly proportional to the product of the charges and inversely proportional to the square of distance between the charges.

The equation of Coulomb's law is given as;

F = Kq₁q₂/r²

where;

Thus, the Coulomb's law equation is  F = Kq₁q₂/r².

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Yes, an oscillating latch will eventually settle to either 0 or 1 due to different gate and wire delays.

In digital circuits, latches are used to store and hold a value until it is updated. However, when there are variations in the gate and wire delays, it can lead to imbalances in the circuit, causing an oscillation in the latch.

Gate delays refer to the time it takes for a logic gate to process an input and produce an output. Wire delays, on the other hand, are caused by the time it takes for a signal to propagate through a wire or interconnect between different components in the circuit.

When there are differences in these delays, it can lead to situations where the feedback loop in the latch is unstable. As the latch tries to settle at a particular value, the delays can cause imbalances in the circuit, leading to oscillations between the two possible states (0 and 1).

Over time, due to various factors such as noise, power supply variations, and thermal effects, these oscillations will dampen, and the latch will eventually settle to either a stable 0 or 1 state. The settling time will depend on the specific characteristics of the circuit and the delays involved.

To ensure proper operation and avoid oscillations, it is important to design circuits with balanced delays and consider timing constraints to minimize the effects of gate and wire delays.

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The complete question is:

Is an oscillating latch will eventually settle to 0 or 1 due to different gate and wire delays .

Answer:

Geologists use seismic waves to locate the center of an earthquake.

Explanation:

Answer: they collect data from seismographs

Explanation: on the quiz on edge 2020, it’s correct

Answer:

The correct answers are It is the resistance of an object to changes in its motion, and It is a force

In the northern hemisphere, gyres rotate in the clockwise direction.

Therefore, the statement on question number 4 is false.

(a) To write a differential equation for H(t) using Newton's Law of Cooling, we can use the formula:

H'(t) = -k(H(t) - T_s)

where H'(t) represents the derivative of H with respect to time, k is the cooling constant, H(t) is the temperature of the juice at time t, and T_s is the temperature of the surrounding medium (mountain stream in this case).

The negative sign in front of the equation indicates that the temperature of the juice decreases over time.

(b) This is the differential equation. H(t) = (90 - T_s) * e^(-kt) + T_s

To solve the differential equation, we need initial conditions. In this case, we know that at t = 0, the temperature of the juice is 90 degrees F, so we have the initial condition:

H(0) = 90

Now, let's solve the differential equation:

H'(t) = -k(H(t) - T_s)

Separate variables and integrate:

1 / (H(t) - T_s) dH = -k dt

Integrating both sides:

∫1 / (H(t) - T_s) dH = -k ∫dt

ln|H(t) - T_s| = -kt + C

Exponentiate both sides:

|H(t) - T_s| = e^(-kt + C)

Since the absolute value can be eliminated, we can write:

H(t) - T_s = ± e^C * e^(-kt)

Let A = ± e^C, which is a positive constant. Therefore:

H(t) - T_s = A * e^(-kt)

Rearrange the equation:

H(t) = A * e^(-kt) + T_s

Now, we can apply the initial condition H(0) = 90:

90 = A * e^(-k * 0) + T_s

90 = A + T_s

A = 90 - T_s

Substituting A back into the equation, we have:

H(t) = (90 - T_s) * e^(-kt) + T_s

This is the solution to the differential equation. The value of k can be determined by using the given information about the temperature of the juice after 5 minutes (t = 5).

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The answer of the following statement is (C) why joining a team is often really discouraging.

Team refers to a group of two or more people who work together to achieve a common goal. A team usually consists of individuals with different skills and abilities who collaborate to complete a task or project. Teams are important in a variety of situations, including work, school, sports, and social activities. A successful team is one in which members are committed to the same goal, trust and respect one another, and are willing to take risks and learn from mistakes. Teams are most effective when members are open to constructive criticism, provide feedback, and are willing to put in the time and effort necessary to achieve their goals.

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Edwin Hubble studied the Andromeda galaxy and found that it was an individual galaxy and not part of our own milky way is Hubble discovered this by observing a variable star, known as a Cepheid variable, in the Andromeda galaxy and measured its distance from Earth.

The Cepheid variable was used to measure the galaxy's distance because the star's brightness varied predictably, and the brightness was directly related to its distance from Earth. By studying the Andromeda galaxy, Hubble discovered that it was much farther away from Earth than originally thought, and it was actually a separate galaxy rather than a part of the Milky Way.

This discovery proved the existence of other galaxies outside of our own Milky Way, which was a groundbreaking finding at the time and paved the way for modern astronomy. Overall, Hubble's study of the Andromeda galaxy provided significant evidence to support the theory that the universe was much larger than previously thought and made a huge contribution to our understanding of the universe.

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The magnitude of the force on the calcium ion is 1.0 x 10^7 N/C * e = 1.6 x 10^-19 N.

Magnitude is a measure of the size or strength of a physical quantity, such as size, brightness, or intensity. Magnitude can be measured in terms of intensity, size, brightness, or a combination of those criteria. For example, the magnitude of an earthquake is usually determined by measuring the intensity of the seismic waves that are generated by the earthquake. Magnitude is also used to measure the brightness of stars, with the brightest stars being given the highest magnitude.

The magnitude of the force on a calcium ion with charge +e is equal to the field strength multiplied by the charge of the ion. Thus, the magnitude of the force on the calcium ion is 1.0 x 10^7 N/C * e = 1.6 x 10^-19 N.

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For r > R, the electric field is given by:

E = λ_total / (2πε₀r).

To summarize:

For r < R: E = λ / (2πε₀r).

For r > R: E = λ_total / (2πε₀r).

Let's consider a cylindrical Gaussian surface with radius r and length L, where L is much greater than the length of the charge distribution. The surface is coaxial with the distribution, meaning it shares the same axis.

For r < R:

Inside the charge distribution, we can imagine a cylindrical Gaussian surface of radius r and length L, which is entirely enclosed within the charge distribution. Gauss's law states that the electric flux through a closed surface is equal to the charge enclosed divided by the permittivity of free space (ε₀). Since the electric field is radially symmetric, it will have a constant magnitude at every point on the Gaussian surface.

The charge enclosed by the Gaussian surface is given by:

Q_enclosed = λ * L,

where λ is the charge per unit length of the distribution.

By Gauss's law, the electric flux through the Gaussian surface is:

Φ = E * A,

where E is the magnitude of the electric field and A is the area of the Gaussian surface.

Since the electric field is constant over the entire surface, we can write:

Φ = E * A = E * 2πrL,

According to Gauss's law, the electric flux is also equal to the charge enclosed divided by ε₀:

Φ = Q_enclosed / ε₀ = (λ * L) / ε₀.

Setting the two expressions for Φ equal to each other:

E * 2πrL = (λ * L) / ε₀,

Simplifying:

E = λ / (2πε₀r).

Therefore, for r < R, the electric field is given by:

E = λ / (2πε₀r).

For r > R:

Outside the charge distribution, the enclosed charge is the total charge of the distribution. However, instead of using the charge per unit length (λ), it is more convenient to use the total charge (Q) divided by the length of the distribution (L). This quantity is the linear charge density, denoted as λ_total.

The charge enclosed by the Gaussian surface is:

Q_enclosed = λ_total * L.

Applying Gauss's law again, the electric flux through the Gaussian surface is:

Φ = E * A = E * 2πrL,

Equating Φ to Q_enclosed / ε₀:

E * 2πrL = (λ_total * L) / ε₀.

Simplifying:

E = λ_total / (2πε₀r).

Therefore, for r > R, the electric field is given by:

E = λ_total / (2πε₀r).

To summarize:

For r < R: E = λ / (2πε₀r).

For r > R: E = λ_total / (2πε₀r).

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Explanation:

Formula:

F*255.92778=K

83 F *255.92778=301.48k

therefore the answer is:

301.48K

Answer:

Explanation: Determine the gravitational acceleration. ...

Decide whether the object has an initial velocity. ...

Choose how long the object is falling. ...

Calculate the final free fall speed (just before hitting the ground) with the formula v = v₀ + gt

Answer:

14

Explanation:

this is totally my work :)

Answer:

Its lack of mass production

Explanation:

Your Welcome;)

The limitation of using cellulose is its lack of mass production.

Cellulose is a polymer of glucose. It is obtained from glucose by condensation polymerization to yield a long chain.

Cellulose materials have a high potential of being quite useful as important materials for diverse applications.

However, the problem with cellulose materials is that they can not really be mass produced. This limitation has long encumbered the possibility of using cellulose materials for various applications in material science.

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Answer:

The formula is the form -

m λ = d sin Θ

As the wavelength λ is decreased sin Θ will also decrease.

One can see from the derivation that as the wavelength, being considered,

is decreased the dispersion will also decrease.

Answer:

elastic

Explanation:

if you stretch it it will go back to its shape, and also it is the only one that makes sense.

Answer:

Elastic

Explanation:

I got it right

a. The object having weight 700N in air, experiences buoyancy force of 200N in water.

b. The density of the object is 3.5g/cm3

a. Archimedes Principle:

When a body is partially or fully immersed in a fluid, its weight appears to decrease and apparent decrease in its weight is equal to weight of the fluid displaced by the body.

The object weight in air is 700N and it's weight in water is 500N.

Buoyancy force = Apparent loss of weight

= 700N - 500N

= 200N

b. Density of the object:

Buoyancy force = Vdg ( where v is volume of the object, d is the density of liquid and g is gravity of earth)

200 = Vdg

200 = V × 1000 × 10 (density of water= 1000kg/m3)

V = 2/100

m/d = 2/100 (V = m/d ,where d is density of solid)

(mg = 700N given in question)

(m = 70)

d = 70× 100/2

d = 3500kg/m3

= 3.5g/cm3

hence density of the object is 3.5g/cm3

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Explanation:

what is the answer

Answer: a. To control all of the people in the community

Explanation:

The sport organization help in bring people of different communities together. It removes any kind of discrimination based on caste, gender, race, and others. People are united in a single team to bring about unity in them. The sport organization does not control the people in the community instead can bring change in their thinking and opinion about people of the other community. The sports activities are recreational in nature, they build social interaction between people of different communities, control good health, make communities safer.