a rifle is shot in a valley formed between two parallel mountains. the echo from one mountain is heard after 2.00 s and from the other mountain 2.00 s later. what is the width of the wvlley?

Acceleration is the rate of change of velocity over time. The diagram that shows the effect of cutting acceleration by half without changing initial velocity is graph (c)

The equation is given as:

\(v = 2t + 4\)

The first equation of motion is:

\(v = u + at\)

By comparing both equations, we have:

\(u = 4\) --- initial velocity

\(a = 2\) --- acceleration

When the acceleration is cut in half, the new acceleration is:

\(a_{new} = \frac a2\)

\(a_{new} = \frac 22\)

\(a_{new} = 1\)

So, the equation of velocity is:

\(v = u + at\)

\(v = 4 + 1 \times t\)

\(v = 4 + t\)

When \(t = 0\)

\(v = 4 + 0 = 4\)

When \(t = 1\)

\(v = 4 + 1 = 5\)

The graph of velocity that satisfies \(v = 4 + t\) and the values of time (t) and velocity (v) tested above is (c).

See attachment for the diagram (graph)

Read more about velocity and acceleration at:

https://brainly.com/question/2239252

An iron core cannot support a star because iron cannot fuse with other nuclei to produce energy. Fusion reactions in stars occur primarily through the conversion of hydrogen into helium in a process known as nuclear fusion.

During the life cycle of a massive star, nuclear fusion reactions create progressively heavier elements in its core. As the fusion process progresses, the core transforms lighter elements into heavier ones, ultimately forming iron. Iron has poor nuclear binding energy compared to lighter elements, which means it requires energy rather than releasing it when nuclei combine to form iron. This is due to iron having the highest binding energy per nucleon, making it the most stable nucleus. Fusion reactions involving iron actually consume energy rather than producing it, leading to the inability of an iron core to support a star. The accumulation of iron in the core triggers the collapse of the star, resulting in a supernova or, in some cases, the formation of a neutron star or black hole.

Learn more about  black hole here

brainly.com/question/10597324

#SPJ11

An iron core cannot support a star because iron cannot fuse with other nuclei to produce energy, and it has poor nuclear binding energy. Additionally, iron is a solid and cannot withstand the extreme conditions at the core of a star.

An iron core cannot support a star because iron cannot fuse with other nuclei to produce energy. In stars, the fusion of lighter elements into heavier ones releases energy, which is essential for the star to maintain its stability and shine. Iron at the core of a star cannot contribute to this fusion process, leading to the star's collapse or explosion.

Furthermore, iron has poor nuclear binding energy compared to other elements. Nuclear binding energy is the energy required to hold a nucleus together. Iron has a lower binding energy per nucleon, making it energetically unfavorable for a star to have an iron core, as it would result in lower stability and energy production.

Lastly, iron is not in the form of a gas, but a solid, at the center of a star. The core of a star is under immense pressures and temperatures that allow elements to exist in extreme states, such as plasma. Iron cannot withstand these extreme conditions and cannot provide the necessary energy for a star to sustain itself.

https://brainly.com/question/33458077

#SPJ11

Answer:

use of nanotechnology ; quantum dots

Explanation:

edg 2021

Answer:

Explanation:

The notes are about using Quantum Dots for bio-medical imagining. The notes are more on its uses than its theory. So the title should be O Uses of Nanotechnology: Quantum Dots.

Answer:

Data from a cross-sectional study or survey might need to incorporate weights or design effects in the analysis.The analysis plan should specify which variables are most

Explanation:

Explanation:

For example, scientists on a ship may examine SONAR data collected in real-time to determine the shape of the seafloor (Fig 2.7 A). ... Biologists might graph the number of box jellyfish over time and compare these data to the phases of the moon to look for patterns (Fig 2.7 B).

The activity in which a competitor displayed good sportsmanship towards me was during a football match.

This is an ethics or attitudes that show respect for the rules of a game and for the other players.

Sportsmanship was shown when i lost the deciding penalty and was consoled by the opponent.

Read more about Sportsmanship here https://brainly.com/question/16690022

Answer:

The mass of the box:

m =  60 kg

Explanation:

Given:

F = 150 N

g = 10 m/s²

_________

m - ?

Coefficient of friction wood on wood:

μ = 0.25

Friction force:

F₁ = μ*m*g

Newton's Third Law:

F = F₁

F = μ*m*g

The mass of the box:

m = F / ( μ*g) = 150 / (0.25*10) =  60 kg

Answer:

Newton's laws of motion relate an object's motion to the forces acting on it.

Explanation:

In the first law, an object will not change its motion unless a force acts on it. ... In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

Answer:

In the first law, an object will not change its motion unless a force acts on it. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

Those sound waves travel at a speed of 1904 meters per second.

The equation for velocity is v = (68 Hz)(28m) = 1904 m/s.

As with all waves, the relationship between the speed of sound, its frequency, and its wavelength is vw=f, where vw denotes the speed of sound, f denotes its frequency, and f denotes its wavelength.

The frequency of a wave is expressed in Hertz (Hz), which is the number of waves that pass by each second. A sound wave, for instance, might have a frequency of 450 Hz.

"The distance between the two successive crests or troughs of the light wave" is how wavelength of light is described. Using the Greek letter lambda (λ), it is identified.

To know about speed

https://brainly.com/question/29071528

#SPJ4

Explanation:

Convert mi/h to ft/s.

60.0 mi/h × (5280 ft/mi) × (1 h / 3600 s) = 88.0 ft/s

Find the acceleration.

a = Δv / Δt

a = (0 ft/s − 88.0 ft/s) / 6.0 s

a = -14.7 ft/s²

The driver must accelerate the car at the average rate of

- 10 mile / hour-second

for 6 seconds .

Answer:

B) minerals .Because they mainly consist of metals

To keep the scale properly spaced, Neptune would have to be placed 2,350 feet away from the scale model sun.

In the scale model at the Perot Museum, the Earth is represented by a poppy seed and is located 77 feet from the scale model Sun. To determine the distance for Neptune, we will use the given information about Earth's distance and the astronomical unit (AU) conversion.

1 AU is the average distance from Earth to the Sun, which is 93 million miles. Neptune is 30.1 AU from the Sun.

First, find the scale of the model by dividing the scaled Earth-Sun distance (77 feet) by 1 AU in feet (93 million miles * 5280 feet/mile):

Scale = 77 ft / (93,000,000 miles * 5280 ft/mile) ≈ 1.592 × 10^-10

Next, calculate the scaled Neptune-Sun distance by multiplying Neptune's actual distance in AU (30.1 AU) by the conversion factor (1 AU in feet) and the scale factor:

Scaled distance = 30.1 AU * (93,000,000 miles * 5280 ft/mile) * 1.592 × 10^-10 ≈ 2350 feet

So, in this scale model, Neptune would have to be placed approximately 2350 feet away from the Sun.

To learn more about scale model -

brainly.com/question/17581605

#SPJ11

Answer:

\(0.361\ \text{m}\)

Explanation:

\(f_s\) = Frequency of source = 375 Hz

\(\Delta f\) = Difference between the maximum and minimum sound frequencies = 2.75 Hz

v = Speed of sound in air = 343 m/s

T = Time period = 1.8 s

\(v_m\) = Maximum speed of the microphone

We have the relation

\(\Delta f=2f_s\dfrac{v_m}{v}\\\Rightarrow v_m=\dfrac{\Delta fv}{2f_s}\\\Rightarrow v_m=\dfrac{2.75\times 343}{2\times 375}\\\Rightarrow v_m=1.26\ \text{m/s}\)

Amplitude is given by

\(A=\dfrac{v_mT}{2\pi}\\\Rightarrow A=\dfrac{1.26\times 1.8}{2\pi}\\\Rightarrow A=0.361\ \text{m}\)

The amplitude of the simple harmonic motion is \(0.361\ \text{m}\).

Explanation:

When the speed of sound near the ground is reduced, (such as on a cold day when the layer of air nearest ground is colder than the air above) the higher speed of the wavefronts above cause a bending of sound toward the ground.

Answer:

D

Explanation:

this is simple, because when air is removed, means that there is no particles in the jar so vacuum is achieved, and when you can't hear a sound means that the sound couldn't travel through the vacuum. which means that sound cannot travel through vacuum,

as a result, sound requires a medium ( air) travel from one point to another.

hope it helps, if not please report it so that someone else gets to try it

A decibel is a dimensionless unit to express physical intensity or sound pressure levels.

A decibel is a dimensionless unit to express physical intensity or sound pressure levels. The decibel, in turn, measures the power of the sound, its energy, and the stronger or weaker it is emitted. Measures the volume of the sound.  It is a logarithmic scale that quantifies the relative loudness or softness of a sound compared to a reference level. The decibel scale is based on powers of 10, where an increase of 10 dB represents a tenfold increase in sound intensity. The reference level for the decibel scale varies depending on the context. In the field of acoustics, the commonly used reference level is 0 dB, which corresponds to the threshold of human hearing. Positive decibel values indicate increasing sound levels, while negative values indicate decreasing sound levels or the absence of sound.

To learn more about Decibel click here

https://brainly.com/question/13047838

#SPJ11

The number of turns in the secondary coil needed to produce an output voltage of 10 V RMS AC, given an input voltage of 120 V RMS AC to the primary coil with 1000 turns, is 83.33 turns (rounded to the nearest whole number).

To determine the number of turns in the secondary coil, we can use the turns ratio formula of a transformer:

\(Turns ratio = (Secondary turns)/(Primary turns) = (Secondary voltage)/(Primary voltage)\)

Rearranging the formula, we can solve for the secondary turns:

\(Secondary turns = (Turns ratio) × (Primary turns)\)

In this case, the primary voltage is 120 V RMS AC, and the secondary voltage is 10 V RMS AC. The turns ratio is the ratio of secondary voltage to primary voltage:

\(Turns ratio = (10 V)/(120 V) = 1/12\)

Substituting the values into the formula, we can calculate the number of turns in the secondary coil:

\(Secondary turns = (1/12) * (1000 turns) = 83.33 turns\)

Therefore, approximately 83.33 turns (rounded to the nearest whole number) are needed in the secondary coil to produce an output voltage of 10 V RMS AC.

Learn more about voltage here:

https://brainly.com/question/12804325

#SPJ11

High-frequency rTMS and low-frequency rTMS are believed to stimulate and inhibit, respectively, activity within those brain regions to which it is applied.

rTMS stands for Repetitive transcranial magnetic stimulation.

It is a safe, harmless and non-invasive method that is used to treat brain activities by controlling the brain stimuli.

Depressed and anxious patients suffer from brain diseases and exhibit different levels of brain activities leading to the release of stimuli in high and low amounts.

However, it is a widely used technique that is differentiated into high and low-frequency rTMS.

Low-frequency rTMS has a value of less than 1 Hz and exhibits inhibitory effects while high-frequency value exceeds 5 Hz and exhibits excitatory effects.

If you need to learn more about high and low-frequency click here:

https://brainly.com/question/21890312

#SPJ4

You will hear a phenomenon called beating, with a beat frequency of 2 Hz, resulting in alternating constructive and destructive interference between the two tuning forks.

When you strike two tuning forks with slightly different frequencies (340 Hz and 342 Hz), the sound waves they produce will interfere with each other. This interference creates a pattern of alternating constructive and destructive interference.

Constructive interference occurs when the waves are in phase, making the sound louder, while destructive interference occurs when they are out of phase, making it quieter. The difference in frequencies (342 Hz - 340 Hz = 2 Hz) determines the beat frequency, which is the rate at which the loudness fluctuates. In this case, you will hear beats occurring 2 times per second, resulting in a rhythmic pulsing sound.

Learn more about interference here:

https://brainly.com/question/31857067

#SPJ11

The expression for the energy stored (E) in a stretched wire of original length (L), cross-sectional area (A), tension (T), and Young's modulus (Y) is given by E = Y * e * ln(L) * A

The work done to stretch the wire can be calculated by integrating the force applied over the displacement. In this case, the force applied is the tension (T) in the wire, and the displacement is the change in length (ΔL) from the original length (L) to the stretched length (L + ΔL).

The tension in the wire is given by Hooke's law, which states that the tension is proportional to the extension of the wire:

T = Y * (ΔL / L)

where Y is the Young's modulus of the material of the wire.

Now, let's calculate the work done to stretch the wire:

dW = T * dL

Integrating this expression from L to L + ΔL:

W = ∫ T * dL = ∫ Y * (ΔL / L) * dL

W = Y * ΔL * ∫ (dL / L)

W = Y * ΔL * ln(L) + C

Here, C is the constant of integration. Since the energy stored in the wire is zero when it is unstretched (ΔL = 0), we can set C = 0.

Finally, the expression for the energy stored in the wire (E) is:

E = W = Y * ΔL * ln(L)

or, if we substitute the cross-sectional area (A) and strain (e) of the wire, where e = ΔL / L:

E = Y * e * ln(L) * A

Thus, the expression for the energy stored (E) in a stretched wire of original length (L), cross-sectional area (A), tension (T), and Young's modulus (Y) is given by:

E = Y * e * ln(L) * A

Learn more about energy on

https://brainly.com/question/13881533

#SPJ1

Answer:

h=112.35

Explanation:

becuase it had to

If the current that is circuit is tripled,  the power is increased by a factor of 9. Option D

The term power refers to the rate of doing work. Now if we have to obtain the work done by the use of the formula; P = I^2R

Now if the current that is circuit is tripled, the power is now obtained by;

P = (3I)^2R = 9I^2R hence the power is increased by a factor of 9.

Learn more about power  in a circuit:https://brainly.com/question/2933971

#SPJ1

The labelled table data hat the experimenter can record observations for the sand and water temperatures at various points is given below.

Here is a labeled data table for recording sand and water temperatures at various points:

Point            Sand Temperature (°C)                 Water Temperature (°C)

1  

2  

3  

4  

5  

The table is 5 columns wide and 3 rows long, with the first column labeled "Point" to indicate the location being observed, and the second and third columns labeled "Sand Temperature (°C)" and "Water Temperature (°C)" respectively to indicate the type of temperature being measured.

The cells under the "Sand Temperature (°C)" and "Water Temperature (°C)" columns are left blank to allow the experimenter to record the corresponding temperature readings for each point.

Learn more about table data:
https://brainly.com/question/27644602
#SPJ1


Full Question:

Although part of your question is missing, you might be referring to this full question:

Label a data table so that the experimenter can record observations for the sand and water temperatures at various points.

the column table 5 length x 3 width

Answer:

A. Displacement is a vector quantity.

332734.34 Joules

Explanation

Kinetic energy is a form of energy that an object or a particle has by reason of its motion and mass, it is represented by the expression

then

Step 1

a) Let

b) now,replace in the formula:

therefore, the answer is 332734.34 Joules

I hope this helps you

We are expected to determine how often the pendulum swings. About 1.58 Hz/1.58 H z was the swing frequency of the two parakeets.

This is so because the pendulum's swinging motion results from the pull of gravity produced by the magnitude of the earth. The velocity of a pendulum can also be influenced by other elements, such as its length. Advertisement. Background. An object suspended from a fixed location and swinging back and forth due to gravity is known as a pendulum.

The pendulum stretch, among other shoulder stretches, can increase the range of motion, alleviate discomfort, and improve flexibility. This activity has been recommended by your doctor or physical therapist to assist speed

To know more about  pendulum swings visit:

https://brainly.com/question/28751492

#SPJ4

Answer:

Speed= 10meters per second, Frequency = 4hz

Explanation:

First we need to find the frequency of the wave. The formula for frequency is: f (frequency) = 1 / T (period). This means we need to convert the period into seconds and then use it as a denominator with one on the numerator.

Since the period is 0.25,

1/0.25= 4hz

Now, we just need to multiply the frequency with the wavelength

4hzx2.5= 10

= 10 meters per second