A train moves away from a station at 50 m/s. The train blows its whistle that has a frequency of 520 Hz. What is the frequency heard at the station? Take the speed of sound to be 340 m/s.440 Hz450 Hz600 Hz610 Hz
Answers
The frequency heard at the station is 440 Hz.
The frequency heard at the station can be calculated using the formula:
observed frequency = emitted frequency× (speed of sound + velocity of observer) / (speed of sound + velocity of source)
In this case, the velocity of the observer (station) is zero and the velocity of the source (train) is 50 m/s away from the station. So, we can plug in the values and get:
observed frequency = 520× (340 + 0) / (340 + 50) = 440 Hz
Therefore, the frequency heard at the station is 440 Hz.
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The frequency heard at the station is 440 Hz.
The frequency of sound heard at the station can be calculated using the formula:
f' = f(v +/- u) / (v +/- us)
Where,
f = frequency of the whistle
v = speed of sound
u = speed of the train
s = distance between the whistle and the station
In this case, the train is moving away from the station, so the sign in the numerator should be negative. Also, we can assume that the distance between the whistle and the station is constant, so we can ignore it.
Substituting the given values, we get:
f' = 520 × (340 - 50) / (340 + 50)
f' = 440 Hz
Therefore, the frequency heard at the station is 440 Hz.
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Related Questions
The total mass of eight identical
building blocks is 31.52 kg. Find the
mass of 1 block.
Answers
Answer:
3.94
Explanation:
divide total mass by the number of blocks since they are identical
Answer:
3.94
Explanation:
You want to find the mass of one block. Since we know there is 8 blocks with the same mass, you can divide the total mass by 8 since the mass is equally distributed within the 8 blocks
Resistance is a property of a(n) _______ while resistivity is a property of a(n) _______. device, material ammeter, voltmeter insulator, conductor conductor, insulator
Answers
Resistance is a property of a device while resistivity is a property of a material. Resistance refers to how well a device or material opposes electric current, whereas resistivity refers to the inherent capability of a material to resist the flow of electric current.
Here are the meanings of the other terms in the options:Ammeter: An ammeter is an instrument that measures the electric current in a circuit.Voltmeter: A voltmeter is a measuring instrument that measures the potential difference between two points.
Conductor. A conductor is a material that conducts electricity well.Insulator: An insulator is a material that does not conduct electricity well.
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A rocket, initially at rest on the ground, accelerates straight upward from rest with constant (net) acceleration 58.8 m/s^2 . The acceleration period lasts for time 6.00 s until the fuel is exhausted. After that, the rocket is in free fall.
Find the maximum height ymax reached by the rocket. Ignore air resistance and assume a constant free-fall acceleration equal to 9.80 m/s^2 .
Answers
Answer:
Approximately \(7.41 \times 10^{3}\; {\rm m}\).
Explanation:
If initial velocity, final velocity, and time taken are all found, then the change in height (displacement) can be found as:
\(\begin{aligned}(\text{displacement}) &= \frac{(\text{average velocity})}{(\text{time taken})} \\ &= \frac{(1/2)[(\text{initial velocity}) + (\text{final velocity})]}{(\text{time taken})}\end{aligned}\).
For example, during the \(t = 6.00\; {\rm s}\) of constant acceleration at \(a = 58.8\; {\rm m\cdot s^{-2}}\), initial velocity was \(u = 0\; {\rm m\cdot s^{-1}}\) and final velocity would be:
\(\begin{aligned}v &= (\text{initial velocity}) + (\text{acceleration}) \, (\text{time}) \\ &= (0\; {\rm m\cdot s^{-1}}) + (58.8\; {\rm m\cdot s^{-2}})\, (6.00\; {\rm s}) \\ &= 352.8\; {\rm m\cdot s^{-1}}\end{aligned}\).
Displacement during this period of time would be:
\(\begin{aligned}(\text{displacement}) &= \frac{(\text{average velocity})}{(\text{time taken})} \\ &= \frac{(1/2)[(\text{initial velocity}) + (\text{final velocity})]}{(\text{time taken})} \\ &= \frac{(1/2)\, (0\; {\rm m\cdot s^{-1}} + 352.8\; {\rm m\cdot s^{-1}})}{(6.00\; {\rm m\cdot s^{-1}})} \\ &\approx 1.058\times 10^{3}\; {\rm m}\end{aligned}\).
During the next part of the flight, initial velocity was \(352.8\; {\rm m\cdot s^{-1}}\) (from the first part of flight) and final velocity would be \(0\; {\rm m\cdot s^{-1}}\) when the rocket reaches maximum height. Acceleration was given to be \(a = (-9.80\; {\rm m\cdot s^{-2}})\)(negative since the rocket is accelerating downward,) but time is not known. Apply the following equation to find the change in height (displacement):
\(\begin{aligned}(\text{displacement}) &= \frac{[(\text{final velocity})^{2} - (\text{initial velocity})^{2}]}{2\, (\text{acceleration})} \\ &\approx \frac{(0\; {\rm m\cdot s^{-1}})^{2} - (352.8\; {\rm m\cdot s^{-1}})^{2}}{2\, (-9.80\; {\rm m\cdot s^{-2}})} \\ &\approx 6.350\times 10^{3}\; {\rm m}\end{aligned}\).
The total change in height would be approximately \((1.058\times 10^{3}\; {\rm m}) + (6.350\times 10^{3}\; {\rm m}) \approx 7.41\times 10^{3}\; {\rm m}\).
What are the 4 characteristics of a concave mirror?
Answers
Concave mirrors can create both actual and virtual pictures. Mirrors can be enlarged, shrunk, or the exact size as the item. They can just be upright (if online) or reversed (unless real); front of the glass (unless real); or behind the glass (if virtual).
What distinguishes a convex mirror?Convex mirrors are not utilized to focus light since they diverge light rays by reflecting light outward. Virtual, upright, and initially smaller than the item, the image grows to a maximum size equal to the thing as it approaches the mirror. Diverging mirrors are another name for such mirrors.
What features distinguish concave?Spherical mirrors include both concave and convex mirrors.
Property 1: The incoming ray that is perpendicular to the main axis travels through the concave mirror's focus.
Property 2: The incident light will be reflected parallel toward the major axis if it passes through the focus.
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The gravitational acceleration on Earth is 9.8 m/s2. What is the weight of a car on Earth (to the nearest whole number) if it has a mass of 1360 kg? 14 N 139 N 1333 N 13,328 N
Answers
Weight = (mass) x (gravitational acceleration where the mass is)
Weight = (1360 kg) x (9.8 m/s²)
Weight = 13,328 kg-m/s²
That's 13,328 Newtons
Given:-
Mass (m) of the car = 1360 kgAcceleration due to gravity (g) = 9.8 m/s²To Find: Weight (W).
We know,
W = mg
where,
W = Weight,m = Mass &g = Acceleration due to gravity.Thus,
W = (1360 kg)(9.8 m/s²)
→ W = 13,328 N (D)
A sprinter runs 200 m in 25 s. Calculate his average speed
Answers
Answer:
Explanation:
speed=distance/time = 200/25=8m/s^2
Compare the ball's accelerations, both direction and magnitude, immediately after they leave her hand. is one acceleration larger than the other? or are the magnitudes equal?
Answers
Both balls soon after they left her palm experienced the same amount of acceleration, but in opposite directions.
Further equation :We define acceleration a as the rate of change of velocity with respect to time for linear motion:
a = dv/dt = d²x/dt²
According to Newton's second law, a force F is required to accelerate a mass m:
F= ma
The forces exerted on the ball govern its acceleration. There is just one force acting on both balls at the moment they are released from the student's hand: gravity. Therefore, the amount and direction of the acceleration of both balls are the same:
F = mg with,
|g| = 9.81 m/s², pointing straight down.
Both balls soon after they left her palm experienced the same amount of acceleration, but in opposite directions.
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The diagram below shows a rock suspended above an
overflow container filled with water up to the overflow
spout. A graduated cylinder is positioned next to the
container to collect water that comes out of the overflow
spout. Which property of the rock can be directly determined
when the rock is placed in the overflow container?
rock
overflow
.
spout
A. mass
B. density
C. volume
D.
hardness
Answers
Answer:
C. Volume
Explanation:
it displaces an equal amount of water to the amount of space it occupies.
Answer: i don't know
Explanation: still
What is the pressure drop due to thhe bernoulli effect as water goes into a 3.00?
Answers
The pressure drop due to the Bernoulli effect as water goes into a 3.00 cm diameter nozzle is about 2000 Pa.
The Bernoulli effect states that as the velocity of a fluid increases, its pressure decreases. This is because the kinetic energy of the fluid increases, and this energy must come from somewhere. The pressure of the fluid provides this energy, so the pressure must decrease.
When water goes into a smaller diameter nozzle, its velocity increases. This is because the water has to flow through a smaller area, so it has to speed up. The increase in velocity causes the pressure to decrease, by about 2000 Pa in this case.
The pressure drop can be calculated using the Bernoulli equation, which is a formula that relates the pressure, velocity, and height of a fluid. In this case, the pressure drop is equal to the difference in pressure between the large diameter hose and the small diameter nozzle.
The pressure drop is a significant amount, and it can have a number of effects. For example, it can cause the water to spray out of the nozzle in a wider pattern. It can also cause the water to be less effective at extinguishing fires.
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direction cosines tell the angle between the force vector and each of the coordinate axes. select one: true false
Answers
The given statement about “direction cosines tell the angle between the force vector and each of the coordinate axes” is true.
Analytical geometry defines the directional cosines of a vector as the cosines of the angles formed by the vector with the three coordinate axes. To calculate the cosine of a vector's direction, divide the relevant coordinate by the vector's length. A direction's cosine is equivalent to a unit vector's x-coordinate. One such property of the direction cosine is that the sum of the squares of all the direction cosines equals one. The cosine of the angle subtended by a line having three coordinate axes, such as the x-axis, y-axis, and z-axis, is known to be the direction cosine. The direction cosines are cos α, cos β, and cos γ if the angles subtended by these three axes α, β, and γ.
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What happens to the compass needle as you move the compas
around the magnet?
Answers
Answer:
When you moved the compass near a bar magnet, the needle pointed toward the magnet's magnetic field and not toward the north.
Explanation:
explains the experimental phenomenon of electron diffraction
Answers
Electron diffraction is a phenomenon that occurs when electrons are scattered or diffracted by a crystal structure or an object. It was first observed by Davisson and Germer in 1927 when they discovered that electrons could be diffracted similar to light. This phenomenon is possible because electrons, like photons, have wave-like properties and can undergo diffraction.
When a beam of electrons is directed toward a crystal lattice, it interacts with the atoms and their electrons in the lattice. This interaction causes the electron beam to diffract, producing a pattern of spots on a detector. The pattern of spots is produced due to the constructive and destructive interference of the scattered electrons.
The electron diffraction pattern is similar to the X-ray diffraction pattern and can be used to determine the structure of crystals. This technique is commonly used in materials science and solid-state physics to study the crystal structures of materials and to understand their physical and chemical properties.
In conclusion, electron diffraction is an experimental phenomenon that occurs when electrons are scattered by a crystal structure, and it is due to the wave-like properties of electrons. This technique has proven to be a powerful tool for understanding the structure and properties of materials in various fields of science.
Electron diffraction is an experimental phenomenon in which a beam of electrons interacts with a periodic lattice, such as a crystalline material. This interaction causes the electrons to scatter and form a diffraction pattern, which can be observed and analyzed. This phenomenon is used to study the structure of materials, including crystal structures and molecular arrangements.
The experimental setup for electron diffraction typically includes an electron gun, which generates a beam of electrons, and a target material, which has a periodic lattice structure. When the electron beam passes through or reflects off the target, the electrons interact with the atoms in the lattice, causing them to scatter.
Due to their wave-particle duality, electrons behave as both particles and waves. As a result, they can interfere with one another, producing a diffraction pattern. This pattern, often captured on a detector or screen, contains information about the periodicity and structure of the lattice.
The analysis of the electron diffraction pattern involves the use of Bragg's Law, which relates the angles at which the electrons scatter to the spacing of the lattice planes. By measuring the angles and applying Bragg's Law, the crystal structure and atomic arrangements can be deduced.
Electron diffraction is widely used in fields such as materials science, chemistry, and solid-state physics, where understanding the structure of materials is crucial for understanding their properties and potential applications.
In summary, electron diffraction is an experimental phenomenon that occurs when a beam of electrons interacts with a periodic lattice, causing the electrons to scatter and form a diffraction pattern. This pattern can be analyzed to determine the crystal structure and molecular arrangements within the material, making it a valuable tool in various scientific disciplines.
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What is the difference between a conductor and an insulator?
Select one:
O a. An insulator transfers thermal energy while a conductor does not. Insulators do not
allow thermal energy to move through them.
Ob.
A conductor transfers thermal energy while an insulator does not.
O c.
Both conductors and insulators transfer thermal energy, but not electrical energy.
One of them does not transfer energy.
O d. Both conductors and insulators transfer electrical energy, but not thermal energy.
Answers
Answer:
b
Explanation:
An insulator does not transfer thermal or electrical energy but a conductor does
Features of Elements
Use the periodic table on the next page to complete the following
table. The number in the name indicates the isotope and therefore
the nuclide number
Element and Chemicol Atomic Mass
Number Number
of
of
Hudito
isotope
number
Symbol.
number
notation
profons neutrons
2 4 나
Helium-4
He
Beryllium-9
Nitrogen-14
N
Oxygen 10
0
Phosphorus 32
P
Chlorine-35
Potassium 39
Tungston-150
w
Lead 90
PU
Answers
Matching Type Instructions. Instructions: Match the elements of Arts and Principles of Design in Column A to its corresponding definition in Column B. Write your answer on a piece of paper. Column A 1. Line 2. Shape 3. Color 4. Emphasis 5. Movement Column B a. An enclosed line. b. Creates an illusion of action. c. A moving point to point. d. It creates a focal point. e. It is derived from reflected light. f. Repetition of specific visual element. 6. Pattern
Answers
Answer:
1:a
2:c
3:f
4:d
5:f or e
6:d
Explanation:
Hope it helps! also if im wrong sorry. but i already learned this so yeah have a nice day!
Which of the following is a property of a transverse wave?
A. It needs a medium to travel.
B. It travels up and down.
C. They are visible to the nake eye.
D. It travels by compressing particles.
Answers
The correct answer is option B. It travels up and down. Transverse waves are characterized by the fact that they cause particles in the medium to move perpendicular to the direction of wave propagation.
What are transverse waves?Transverse waves are a type of wave that causes the particles of the medium to move up and down or side to side as the wave passes through them.
The other options are not right because:
Option A: It describes a property of a longitudinal wave, not a transverse wave. Longitudinal waves do need a medium to travel, whereas transverse waves can travel through a vacuum, such as light waves.Option C: It is not necessarily true that transverse waves are visible to the unaided eye. Some transverse waves, such as light waves, are visible, but others, such as radio waves, are not.Option D: It describes a property of a longitudinal wave, not a transverse wave. Longitudinal waves travel by compressing particles, whereas transverse waves travel by perpendicular vibrations.Learn more about transverse waves here:
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if i weigh 100 ibs on earth how much do i weight on uranus
Answers
Gravity on Uranus is 86% of Earths.
100 pounds x 86% = 86 pounds
You would weigh 86 pounds.
which force binds stars together to form galaxy? * 1 point a) gravitational attractive force b) strong nuclear force c) electrical force d) centripetal force e) none of these
Answers
Option A is correct. The force that holds all the elements of the galaxy together is gravity, which is a feature of matter because of its mass.
The unifying force of the universe is inertia. Literally. Without it, matter would not possess the electric forces required to create its current configuration. The heat and kinetic energy created by moving particles work to resist inertia. There are four basic forces of nature, which you may recall if you recall any of the physics you learnt in school. Gravity, electromagnetism, the weak nuclear force, and the strong nuclear force are listed in no particular order.
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Answer: A is the proper answer. Gravity, which is a property of matter due to its mass, is the force that keeps every component of the galaxy together.
Explanation: Inertia is the driving force of the cosmos.
Without it, the matter wouldn't have the electric forces necessary to shape its existing structure.
Moving particles provide heat and kinetic energy, which operate to counteract inertia.
There are four basic forces of nature,
the following are listed: gravity, electromagnetism, weak nuclear force, and strong nuclear force.
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A moving electric charge is surrounded by:
no field
an electric field only
both an electric field and a magnetic field
a magnetic field only
Answers
Answer:
both an electric field and a magnetic field
Explanation:
Hold your index finger and middle fingers close to each other, leaving a small slit between them about 1 mm in width. Look through the slit into a source of light such as the window or lamp (NOT THE SUN). You will need to look with one eye up close to the slit. Why do the vertical black lines show up when your fingers are close together but not when they are far apart? Explain.
Answers
Answer:
I would say tunnel vision cause your only using one eye and if your looking through a tiny space your vision gets blury
Explanation:
Activity 1 MATCH IT
Directions: Match Column A to Column B. Write your answer on the space provided before the number.
COLUMN A
__1. Hiking
__2. Orienteering
__3. Zumba
__4. Volleyball
__5.badminton
COLUMN B
A. It is an outdoor navigational recreational activity using specially drawn and detailed maps.
B. Created through on-the –spot aerobics class using the non- traditional music.
C.Going on an extended walk for the purpose of pleasure and exercise.
D. Can be traced from the ingenuity of William J. Morgan in 1895 at Holyoke Massachusetts.
E. Games are held inside the gym to avoid the effect of air in the flight of the shuttle.
Answers
Answer:
1. A hiking
2. C
3. B
4. D
5. E
Bill runs a total of 3,600m. What is this distance in kilometres?
Answers
Answer:
3.6 Km..........................................
Calculating the Magnitude of the Resultant Vector
R
13 m
5m
What is the magnitude of the resultant vector? Round
your answer to the nearest tenth.
m
Answers
The magnitude of the resultant vector is 13.9m.
The size of the resulting vector can be determined using the Pythagorean theorem. As you can see from these two examples, the result of adding three or more rectangular vectors is easy to determine using the Pythagorean theorem. The vectors should be added in a different order. Equation 2 Subtracts the vectors in opposite directions from each other to get the resulting vector.
Where vector B is in the opposite direction to vector A and R is the resulting vector. The resulting vector is defined as a single vector that produces the same effect as many vectors produced together. The size of a vector is the length of the vector. The absolute value of vector a is represented by |a|. For more information on vector sizes, see Vectors overview. The formulas for the sizes of 2D and 3D vectors in terms of coordinates are derived on this page.
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List out of how animals and plants can cause weathering.
Plants
Answers
Cardio exercise keeps that all-important muscle—the ________—strong by forcing it to pump blood and oxygen more quickly throughout the body.
Group of answer choices
A. biceps
B. heart
C. stomach
D. liver
Answers
Answer:
Heart
Explanation:
i truly need help with these 10 questions , it soo late and i only have 2 days too turn it in please anybody help me !!
Answers
PLS ANSWER FAST WILL GIVE BRAINLEST!!!
If a 25kg car accelerates at a speed 100m/ s2 s2, what will the force of the car be?
Plug in the numbers: Force=mass x acceleration
Answers
Answer:
2500 Newtons
Explanation:
If force equals the mass × acceleration then all should be quite simple
25kg is the mass of your car
100 m/s/s is the acceleration of you car
25kg • 100m/s/s = 2500 Newtons
Answer:
\(\boxed {\boxed {\sf 2500 \ Newtons }}\)
Explanation:
The formula for force is the product of mass and acceleration.
\(F=m*a\)
The mass of the car is 25 kilograms and the acceleration is 100 meters per square second. So,
\(m= 25 \ kg \\a= 100 \ m/s^2\)
Substitute the values into the formula.
\(F= 25 \ kg * 100 \ m/s^2\)
Multiply.
\(F= 2500 \ kg*m/s^2\)
1 kilogram meter per square second is equal to 1 NewtonOur answer of 2500 kg*m/s² is equal to 2500 Newtons\(F= 2500 \ N\)
The force of the car is 2500 Newtons.
Which statement BEST describes scientific theories?
A.) Scientific theories are what laws are called before they are proven.
B.) Scientific theories attempt to explain why natural events occur.
C.) Scientific theories are based on opinions.
D.) Scientific theories describe natural events.
Answers
B.) Scientific theories attempt to explain why natural events occur.
Explanation:
Hope it helps.
The hog-nosed bat is the smallest mammal on Earth: it is about the same size as a bumblebee and has an average mass of 2.0 g. Suppose a hog-nosed bat with this mass flies at 2.0 m/s when it detects a bug with a mass of 0.20g flying directly toward it at 8.0 m/s. What fraction of the total kinetic energy
dissipated when it swallows the bug?
Answers
Given
\(m_1 = 2g\\\\m_2 = 0.2g\\\\v_1 = 2m/s\\\\v_2 = -8m/s\)
The expression for a perfectly inelastic collision,
\(m_1v_1 + m_2v_2 = (m_1+m_2)v_f\)
Therefore,
\(v_f = \frac{m_1v_1 + m_2v_2}{(m_1+m_2)} \\\\v_f = \frac{(2*2)+(0.2*-8)}{2+0.2}\\\\v_f = 1.09m/s\)
Since the bat and the bug fly towards each other, and after some time the bat swallows the bug, it is said to be a condition of perfectly inelastic collision.
The kinetic energy of the bat before it swallows the bug is,
\(KE_b = \frac{1}{2}m_1v_1^2\\\\KE_b = \frac{1}{2}2*2^2\\\\KE_b = 4gm^2/s^2\)
The kinetic energy of the bat after it swallows the bug is,
\(KE_f = \frac{1}{2}(m_1+m_2)v_f^2\\\\KE_f = \frac{1}{2}(2+0.2)1.09^2\\\\KE_f = 1.3gm^2/s^2\)
The total dissipation in the kinetic energy of the bat is calculated as,
\(\delta KE = KE_b - KE_f\\\\\delta KE = 4 - 1.3\\\\\delta KE = 2.7 gm^2/s^2\)
The fraction of the dissipated kinetic energy of the bat is calculated as,
\(d = \frac{\delta KE}{KE_b}\\\\d = \frac{2.7}{4}\\\\d = 0.67\)
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A rectangular coil 25 cm by 45 cm has 150 turns. This coil produces a maximum emf of 75 V when it rotates with an angular speed of 190 rad/s in a magnetic field of strength B. Find the value of B.
Induced Emf in Rotating Coil:
When a coil rotates in a magnetic field, the magnetic field can induce an emf in the coil. This type of electrical structure is found in generators or motors. The coil or loop is situated on the rotor of the generator or motor.
Answers
The value of the magnetic field strength (B) is 561.9 Tesla.
To find the value of the magnetic field strength (B), we can use Faraday's law of electromagnetic induction, which states that the induced emf (ε) in a coil is equal to the rate of change of magnetic flux (Φ) through the coil.
The magnetic flux through a coil is given by the equation:
Φ = B * A * cos(θ),
where B is the magnetic field strength, A is the area of the coil, and θ is the angle between the magnetic field lines and the normal to the coil.
In this case, the coil is rectangular with dimensions 25 cm by 45 cm, so the area A of the coil is:
A = (25 cm) * (45 cm) = 1125 cm^2 = 0.1125 m^2.
The coil has 150 turns, so the total magnetic flux through the coil is:
Φ = B * A * N,
where N is the number of turns. Substituting the values:
Φ = B * 0.1125 m^2 * 150.
The maximum induced emf ε is given as 75 V, so we can write:
ε = dΦ/dt,
where dt is the change in time. Since the angular speed ω is given as 190 rad/s, we can write dt = dθ / ω, where dθ is the change in angle.
Now, we need to determine the change in angle during the time it takes to achieve the maximum emf. The angular speed ω is the rate of change of angle, so we can write:
dθ = ω * dt.
Substituting dt = dθ / ω, we get:
ε = dΦ / (dθ / ω).
Rearranging the equation, we have:
dΦ = ε * (dθ / ω).
Substituting the values:
B * 0.1125 m^2 * 150 = 75 V * (dθ / 190 rad/s).
Simplifying the equation, we find:
B = (75 V * 190 rad/s) / (0.1125 m^2 * 150).
Calculating the right side of the equation:
B = (75 * 190) / (0.1125 * 150) = 9500 / 16.875 = 561.9 Tesla (T).
Therefore, the value of the magnetic field strength (B) is approximately 561.9 Tesla.
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