Answer:
Wavelength, [tex]\lambda=2.94\ m[/tex]
Explanation:
It is given that,
Speed of radio waves is [tex]v=3\times 10^8\ m/s[/tex]
Frequency of radio waves is f = 101,700,000 Hz
We need to find the wavelength of WFNX’s radio waves. The relation between wavelength, frequency and speed of a wave is given by :
[tex]v=f\lambda[/tex]
[tex]\lambda[/tex] is wavelength
[tex]\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{3\times 10^8}{101,700,000}\\\\\lambda=2.94\ m[/tex]
So, the wavelength of WFNX’s radio waves is 2.94 m.
The wavelength of WFNX’s radio waves with the given speed and frequency is 2.95m.
Given data in the question;
Speed of wave; [tex]c = 3 * 10^8m/s[/tex]Frequency of wave; [tex]f = 1.017 * 10^8 Hz = 1.017 * 10^8 s^{-1}[/tex]wavelength; [tex]\lambda =\ ?[/tex]
To determine the wavelength of the radio wave, we use the expression for the relations between wavelength, frequency and speed.
[tex]\lambda = \frac{c}{f}[/tex]
Where [tex]\lambda[/tex] is wavelength, f is frequency and c is the speed.
We substitute our given values into the equation
[tex]\lambda = \frac{3*10^8m/s}{1.017*10^8s^{-1}}\\\\\lambda = 2.95m[/tex]
Therefore, the wavelength of WFNX’s radio waves with the given speed and frequency is 2.95m.
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In order to increase the kinetic energy of a speeding train by 44%, 42MJ of work must be performed (1 MJ = 106 J). If the final velocity of the train (after the 42 MJ of work) is 9 m/s, what is the mass of the train in metric tons (1 metric ton = 1000 kg)?
Answer:
Explanation:
100 % increase makes an amount 2 times .
44 % increase = 42 MJ
100 % increase = 95.45 MJ
final kinetic energy = 2 x 95.45 MJ
= 190.9 x 10⁶ J
1/2 m v² = 190.9 x 10⁶
.5 x m x 9² = 190.9 x 10⁶
m = 4.71 x 10⁶ kg
= 4710 metric ton .
What is the practical applications of radio waves
Radio waves are used in a vast array of practical applications including cooking with microwaves, communication via phones and radios, medical imaging like MRI, and wireless communications like WiFi and satellite TV.
Radio waves are an integral part of the electromagnetic spectrum and have a wide range of practical applications. These applications span various subcategories, from microwaves used in heating food to the electromagnetic waves utilized for AM and FM radio, cellular telephones, and TV broadcasting. A familiar example is the microwave oven, which uses microwaves to heat food by causing water molecules to vibrate. Similarly, the medical field benefits greatly from radio waves; for instance, Magnetic Resonance Imaging (MRI) uses radio waves to create detailed images of the inside of the human body.
Radio waves also dominate wireless communication technology, enabling data transmission for a variety of devices such as smartphones, PDAs, and wireless networks. GPS units, garage door openers, and wireless peripherals like computer mice and keyboards rely on radio waves to function without physical connections. On a larger scale, radio waves facilitate satellite and broadcast television, providing entertainment and crucial information to millions of people worldwide. Even deep-space radio communications, essential for space exploration, operate on radio waves, reaching vast distances across the solar system and beyond.
What is radioactivity?
A. The movement of electrons around an atomic nucleus
B.The emission of high-energy particles or waves from atoms
C.A term that describes the forces that hold atomic nuclei
together
D.The application of heat energy to an atomic nucleus
Answer:
B. The emission of high-energy particles or waves from atoms
Explanation:
what would result from under-coverage?
a. accurate results
b. an experiment
c. lack of accurate results
d. an incorrect independent variable
What was the Law of Triads? A. Elements were arranged into three rows. B. Elements were arranged in groups of three. C. Elements were arranged into three periods. D. Elements were arranged into three periods and three groups.
Answer:
its B
Explanation: i searched it up...
The Law of Triads, proposed by Johann Dobereiner, grouped elements into triads based on similar properties, with an example being the triad of lithium, sodium, and potassium. The correct answer is B: Elements were arranged in groups of three.
The Law of Triads was an early attempt to categorize elements based on their properties by grouping them in sets of three with similar characteristics. Answer to the student's question is B: Elements were arranged in groups of three. This concept was proposed by the German chemist Johann Dobereiner in 1829. Dobereiner noticed patterns among certain groups of three elements (triads) such as lithium, sodium, and potassium as well as chlorine, bromine, and iodine. He found that the atomic masses of the lightest and heaviest elements in a triad, when averaged, were close to the atomic mass of the middle element, and these triads also had similar chemical reactions. However, this system had limitations as it could not categorize all known elements. Today, we recognize that portions of the periodic table, particularly the d-block, have triads of elements with substantial similarities. The periodic table has since evolved to arrange elements in increasing order of atomic numbers, forming periods and groups that reflect periodic functions of their atomic numbers.
What is the frequency of a sound wave when the speed of sound is
345 m/s and it has a wavelength of 1.31 m?
To calculate the frequency of a sound wave with a speed of 345 m/s and a wavelength of 1.31 m, use the formula f = v / λ, which yields a frequency of approximately 263.36 Hz.
To find the frequency of a sound wave, you can use the formula for the speed of sound, where speed (v) is equal to the product of the frequency (f) and the wavelength (λ). This relationship is expressed as v = f × λ. Given the speed of sound is 345 m/s and the wavelength is 1.31 m, you can rearrange the formula to solve for frequency: f = v / λ.
By substituting the given values, the calculation for frequency is: f = 345 m/s / 1.31 m. This gives us a frequency of approximately 263.35877862595 Hz, which we can round to 263.36 Hz.
Paleobotany is the study of fossil insects. True False
Answer:
False
Explanation:
Paleobotany is the study of fossil plants.
Answer:
false
Explanation:
how would i plant a watermelon seed?
Explanation:
Create mounds.
Plant the seeds.
Watch for sprouts to appear.
Mulch each hill with a suitable material after the plants have reached a height of about 4 inches or so
Water less when the flowers bloom.
good day and be safe
∵∴∵∴∵∴∵∴∵
⊕ΘΞΠΤ⊕
∵∴∵∴∵∴∵∴∵
What is the momentum of an asteroid that has a mass of 1.35 × 10 kg and a velocity of 12 2.55 × 10 m/s?
Answer:
Momentum, [tex]p=3.44\times 10^{16}\ kg-m/s[/tex]
Explanation:
We have,
Mass of the asteroid is [tex]1.35\times 10^{12}\ kg[/tex]
Velocity of asteroid is [tex]2.55\times 10^4\ m/s[/tex]
It is required to find the momentum of an asteroid. Momentum of an object is given by the its velocity. It is given by :
[tex]p=mv\\\\p=1.35\times 10^{12}\times 2.55\times 10^4\\\\p=3.44\times 10^{16}\ kg-m/s[/tex]
So, the momentum of the asteroid is [tex]3.44\times 10^{16}\ kg-m/s[/tex].
A nail is hit with a hammer. Which type of contact force has been applied?
A.
spring force
B.
impact force
C.
friction force
D.
tension force
Answer:
impact force
Explanation:
An impact force is a type of contact force. An impact force is a force that exerts a large amount of force over a short time.
Hitting a nail with a hammer is one example of an impact force.
Final answer:
An impact force is applied when a nail is hit with a hammer. This type of force arises from the hammer making contact and exerting a large force over the small area of the nail tip, resulting in high pressure.
Explanation:
The type of contact force applied when a nail is hit with a hammer is an impact force. This force results from the interaction of the hammer coming into contact with the nail and is a consequence of the interatomic electric forces that arise when objects touch each other. Tension, friction, and spring forces are examples of contact forces, but in the case of a nail being hammered, the instantaneous and high magnitude force is indeed an impact force.
To calculate the force required to create a pressure of 3.00 × 10⁹ N/m² on a nail with a circular tip of 1.00 mm diameter, we can use the formula Pressure (P) = Force (F) / Area (A). Firstly, find the area of the nail's tip using the formula for the area of a circle, A = πr², where r is the radius. Since the diameter is 1.00 mm, the radius is 0.5 mm or 0.0005 meters. After calculating the area, rearrange the formula to solve for the force, F = P * A.
Signs that say "do not use near an open flame" refer to a(n) A) energy property. B) chemical property. C) physical property. D) mechanical property.
Answer: B chemical
Explanation: it will make a chemical reaction
Final answer:
Signs warning against use near an open flame are referencing a substance's flammability, which is a b) chemical property indicating how substances react chemically, such as burning.
Explanation:
Signs that say "do not use near an open flame" usually refer to the flammability of a substance; this is a chemical property. A chemical property describes how a substance changes its chemical structure in reaction to other matter. Flammability indicates the ability of a substance to burn or ignite, causing it to change chemically from the original substance to new chemical products as a result of the reaction with an open flame.
For example, when a match burns, the chemical properties of the match are displayed because new substances such as carbon dioxide and water vapor are produced from the combustion process.
I need help on this please
Answer:
the true statement would be your second box, the one that says "in the year 1500, there are more than 2 billion people on Earth."
The line that represents the population on the graph stays constant, therefore, there is not a rise or decrease. That is why all the other three boxes are false.
Explanation:
what is the maximum speed of a 34-g object bouncing on a spring (k=78.1 N/m) with an amplitude of 3.5-cm?
Answer:
The maximum speed of the mass is 1.67 m/s.
Explanation:
We have,
Mass of object is 34 g or 0.034 kg
Spring constant of the spring is 78.1 N/m
Amplitude attained by the object is 3.5 cm or 0.035 m
It is required to find the maximum speed of the object in this spring mass system. The maximum speed is given by :
[tex]v=A\omega[/tex]
[tex]\omega=\sqrt{\dfrac{k}{m}}[/tex]
[tex]v=A\sqrt{\dfrac{k}{m}}[/tex]
Plugging all the values in above formula,
[tex]v=0.035\times \sqrt{\dfrac{78.1}{0.034}}\\\\v=1.67\ m/s[/tex]
So, the maximum speed of the mass is 1.67 m/s.
Final answer:
The maximum speed of a 34-g object bouncing on a spring with an amplitude of 3.5-cm is 0.335 m/s.
Explanation:
To find the maximum speed of the object, we need to first calculate the maximum potential energy stored in the spring, and then convert it to kinetic energy. The formula for the potential energy stored in a spring is given by:
PE = (1/2)kx²
Where PE is the potential energy, k is the force constant of the spring, and x is the amplitude. In this case, the amplitude is 3.00 cm, or 0.03 m, and the force constant of the spring is 1.25 N/m. Substituting these values, we get:
PE = (1/2)(1.25 N/m)(0.03 m)²PE = 0.0005625 JThe maximum kinetic energy is equal to the maximum potential energy:
KE = 0.0005625 JThe maximum speed of the object can be calculated using the formula:
v = √(2KE/m)
Where v is the maximum speed, KE is the maximum kinetic energy, and m is the mass of the object. In this case, the mass of the object is 0.0100 kg. Substituting these values, we get:
v = √(2(0.0005625 J)/(0.0100 kg))v = √(0.1125 m^2/s²)v = 0.335 m/sTherefore, the maximum speed of the object bouncing on the spring is 0.335 m/s.
Arrange the layers from youngest to oldest
The Principle of Superposition in geology tells us that deeper strata are older than strata above them. Starting from top to bottom, the sequence in this case would be: forest-cover layer, topographic layer, standing water layer, flowing water layer, boundary layer, and road layer. This concept is also applied in physics' ABC packing where the sequence of A-B-C identifies A as newest and C as oldest.
Explanation:In geology, the principle of superposition can be used to determine the age of different layers or strata. It states that strata that are deeper are older than strata above them. For example, if we are looking at the layers mentioned, we start from the top layer which is the most recent, and go down to the bottom layer which is the oldest.
Starting with a forest cover layer (light green) as the youngest strata. Overlaying it is the topographic layer (contour lines), followed by a standing water layer (pond, lake). Next is a flowing water layer (stream, river), then the boundary layer, and the oldest identified layer is the road layer on top. We could refer to figure 2.3 that shows objects on deeper strata (like the pottery fragments in Stratum E) are older than those above (like the shell buttons in Stratum C).
In similar manner, layer representation is used in ABC packing. Here, the sequence of layers is A-B-C-A-B-C-A-B-C... with A being the newest and C being the oldest.
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When do most ionic bonds form
Answer: form electrostatic attraction between oppositely charged icons
Explanation:
Answer:
Explanation:
Ionic bonds usually form when the tendency of an atom attracts electrons, if the attraction is powerful between the two atoms, a ionic bond can form
If the solar system is made to scale where 1 inch equals 100,000, how long is the distance from the sun all the way to Pluto?
A peanut
A pinhead
An 8 inch wide ball
A 2 inch marble
When using a scale of 1 inch equals 100,000 miles, the distance from the Sun to Pluto is about 36,700 inches, or over half a mile, making it much longer than any of the given comparison objects.
Explanation:The distance from the Sun to Pluto averages about 3.67 billion miles (5.9 billion kilometers). When creating a scale model of the solar system, if we use the scale where 1 inch equals 100,000 miles, we can calculate the distance from the Sun to Pluto in inches to find out how long it would be in our scaled representation.
First, we convert the distance of 3.67 billion miles to inches on our scale. To do this, divide the distance by the scale factor:
3.67 billion miles / 100,000 = 36,700 inches
To give a more tangible visualization, 36,700 inches is approximately 3,058.33 feet, or roughly 0.58 miles. So, in our scale model, the distance from the Sun to Pluto would be over half a mile long! Clearly, none of the provided options (a peanut, a pinhead, an 8 inch wide ball, a 2 inch marble) are remotely large enough to represent this distance accurately.
a minibus is travelling along a flat road. predict what would happen if the tyres on the minibus were not properly inflated. use friction to justify your answer.
Answer:
If said tires were not properly inflated more of the tire would be touching the ground due to the "sag" greatly increasing the friction of the road and the tires also maybe slightly less relevant the axle has to "lift" the tire around each rotation of the wheel which together would make it much harder for the bus to move forward.
Explanation:
A tow truck exerts a force of 11,000N to pull a car out of a ditch. It moves
the car a distance of 5m in 25 sec. What is the power of the tow truck?
Answer:
2,200 Watts
Explanation:
The power of the truck is "2200 W".
Given:
Force,
F = 11,000 NDistance,
D = 5 mTime,
t = 25 sec
As we know,
→ [tex]Power (P) = \frac{FD}{t}[/tex]
By substituting the values, we get
→ [tex]= \frac{11000\times 5}{25}[/tex]
→ [tex]= \frac{55000}{25}[/tex]
→ [tex]=2200 \ W[/tex]
Thus the above approach is appropriate.
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What is the force applied to a charge if a charge of 0.86 C is moved through an electronic field with a strength of 1,739.90 N/C
Answer:
Force, F = 1496.31 N
Explanation:
We have,
Charge, Q = 0.86 C
Electric field, E = 1739.90 N/C
It is required to find the force applied to a charge. When an object is placed in the electric field, it will posses electric force. The electric force acting on the charge is given by :
[tex]F=qE[/tex]
[tex]F=0.86\ C\times 1739.90\ N/C\\\\F=1496.31\ N[/tex]
So, the force applied to the charge is 1496.31 N.
What occurs when water freezes?
Answer:
The water turns into a solid, by the atoms bunching closer together. They still move, but they cannot move as freely as they were when liquidized (when in liquid form, the atoms are more loosely held together, and can slide past each other more freely)
Explanation:
Answer: the water reaches it’s freezing point when it freezes
Explanation:
Compare a circuit with a river. Which of the following makes a good analogy to a load?
a waterwheel
a dock
a bridge
a dam
You are asked to design a retroreflector using two mirrors that will reflect a laser beam by 180 degrees independent of the incident direction of the beam. What should be the angle between the two mirrors?
To create a retroreflector with two mirrors that reflects a laser beam by 180 degrees, the mirrors should be arranged at a 90-degree angle to form a corner reflector. The light reflects off each mirror at the same angle it arrived, resulting in the beam retracing its path back.
Explanation:To design a retroreflector with two mirrors that reflects a laser beam by 180 degrees independent of the incident direction, the angle between the two mirrors should be precisely 90 degrees. This configuration creates a corner reflector. When a beam of light strikes one mirror, it reflects off at the same angle it arrived but on the opposite side of the normal (per the Law of Reflection). The beam then strikes the second mirror, which is perpendicular to the first, and it once again reflects off at an angle equal to its incident angle relative to the normal of the second mirror. Because the mirrors are at a 90-degree angle to each other, the two reflections combined result in the light retracing its path back, creating a 180-degree reflection.
Retroreflectors are commonly used for this purpose because they ensure the reflected light beam is always parallel to the incoming light, regardless of where it strikes the reflector. This characteristic is critical in applications like road signs and bicycle reflectors, where visibility from various angles is essential.
Based on your gender and age, how many grams of proteins should you eat each
day?
Answer:
Estimated requirements: US & Canadian Dietary Reference Intake guidelines: Women aged 19 to 70 years old: 46 gms of protein per day (based on 57.5 kg individual). Men aged 19 to 70 years of age: 56 grams of protein per day (based on 70kg individual).
Explanation:
Protein intake varies based on age, gender, and activity level. Generally, teenage boys need about 52 grams, teenage girls need about 46 grams, adult men need about 56 grams, and adult women need about 46 grams. These values could increase for active individuals.
Explanation:The amount of protein you need each day depends on your age, gender, and activity level. For example, a sedentary teenage boy generally needs about 52 grams of protein a day, while a sedentary teenage girl generally needs about 46 grams. However, if the teenager is active, they may need more protein to support muscle growth and repair. Adults generally need about 56 grams of protein per day for men and 46 grams for women. But again, if active, they may need more. Always consult with a healthcare provider or nutritionist to better understand your daily protein needs.
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A satellite orbiting Earth at an orbital radius r has a velocity v. which represents the velocity if the satellite is moved to an orbital radius of 3r?
The velocity of a satellite orbiting at an orbital radius r can be determined using a formula. By substituting 3r into the formula, the velocity at the new orbital radius can be found.
Explanation:The velocity of a satellite orbiting Earth at an orbital radius r can be determined using the formula v=√(GM/r), where M is the mass of Earth, G is the gravitational constant, and v is the velocity. If the satellite is moved to an orbital radius of 3r, the new velocity can be found by substituting 3r into the formula. The new velocity would be v=√(GM/(3r)).
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Which two statements about composite materials are true?
Answer:
Here down below is 3 things true about composite materials
Explanation:
-They’re made up of more than one substance.
-They have the same or similar properties as the materials used to make them.
-They’re always made of metal.
-They’re readily available in nature.
A 1.0 kg pendulum has an initial total energy of 10 J. Calculate the energy lost as heat if the pendulum is 0.10 m high and is traveling at 4.0 m/s.
Answer:
Lost energy = 2J
Explanation: Given that the
Mass of the pendulum M = 1.0kg
Initial energy E = 10J
Height h = 0.1 m
Speed V = 4 m/s
Let us use conservation of energy to analyze the senero
The maximum P.E at the initial position will be equal to maximum P.E for travelling down the hill
I.e
Total P.E = total K.E
K.E = 1/2MV^2
K.E = 1/2 × 1 × 4^2
K.E = 8J
Since P.E = K.E
P.E = 8J
But initially energy E = 10J
Lost energy = P.E - E
Lost energy = 10 - 8 = 2J
Which properties do metalloids share with metals?
PER
Both are shiny and are brittle.
Both are very conductive and are dull.
Both are brittle and are gases at room temperature.
Both are shiny and are solid at room temperature.
O
The properties that can be associated with both metalloid and metals as regards this question is D; Both are shiny and are solid at room temperature.
A metalloid can be regarded as chemical element that has its properties as intermediate between metals and nonmetal.They are:solid at room temperatureThey can appear shinnyA metal can be regards as chemical element, they are material with high usefulness. Some of their properties are;solid at room temperaturelustrous appearanceconductors of electricity and heatThey are malleable or ductile.They can appear shinnyExamples of metal are potassium, calcium.
Metals are not brittle, and they are not liquid at room temperature.Therefore, option D is correct, because both metals and metalloid are seen as solid under room temperature.
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Examine the properties of the three magnets in the chart below. Which of these
magnets is most likely a temporary magnet?
Answer:
C
Explanation:
The chart shows the voltage of four electric currents.
Which is best supported by the data in the chart?
1
Voltage of Currents
Current
Volts (V)
9.0
1.5
3.0
4.5
O Current w flows at a higher rate than Current Z.
Current Y flows at a lower rate than Current X.
Current X has a lower potential difference than Current
Current Z has a greater potential difference than
Current W.
Answer:
C) Current X has a lower potential difference than Current Y.
Explanation:
What units must be used for v?
Ek = _ x m x v2
Answer:
kg·m2·s−3·A−1
I hope this helps you
In the equation for kinetic energy, velocity (v) should be in meters per second (m/s), particularly when working with other factors like gravitational potential energy, where units also involve meters and seconds.
Explanation:The question is addressing the format of kinetic energy. In the kinetic energy equation Ek = 1/2m * v², v represents the velocity of the object. It can be measured in various units; however, in this context, the unit of velocity (v) should be meter per second (m/s) to ensure the correct calculation of kinetic energy.
In problem-solving contexts where you are dealing with gravitational potential energy (e.g., mgh), height (h) would need to be in meters, and acceleration due to gravity (g) is typically in m/s². Therefore, in both of these situations, your velocity (v) should be in meters per second.
As you deal more with problems relating to kinetic energy, it's useful to know that these units should be the same across your calculations to ensure your final answer is consistent and correct. This practice is a key aspect of understanding kinetic energy calculations.
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