Answer:
C. Reflection of the wave with the same wave speed
Explanation:
Reflection occurs when waves bounce back from a surface they cannot pass through.
Reflection can happen with any type of waves, not just sound waves. For example, light waves can also be reflected. In fact, that’s how we see most objects. Light from a light source, such as the sun or a light bulb, shines on the object and some of the light is reflected. When the reflected light enters our eyes, we can see the object.
Reflected waves have the same speed and frequency as the original waves before they were reflected. However, the direction of the reflected waves is different. When waves strike an obstacle head on, the reflected waves bounce straight back in the direction they came from. When waves strike an obstacle at any other angle, they bounce back at the same angle but in a different direction.
When a wave encounters a non-transmitting barrier, it undergoes C. reflection with the same wave speed.
Explanation:Reflection is the process by which light, sound, or other waves bounce back when they encounter a boundary or obstacle. It's a fundamental phenomenon in physics and optics, used in mirrors, echo formation, and various technologies like radar and sonar for detection and imaging.
When a wave encounters a non-transmitting barrier, the phenomenon that occurs is a reflection of the wave with the same wave speed. This means that the wave bounces back off the barrier and continues moving at the same speed. The direction of the reflected wave depends on the angle at which the original wave hits the barrier, following the law of reflection.
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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 .
Carlota does 2000 J of work on a machine. The machine does 500 J of work. What is the efficiency of the machine?
A. 4%
B. 25%
C. 75%
D. 400%
Correct option is B. The efficiency of the machine is 25%, determined by dividing the work output (500 J) by the work input (2000 J) and then multiplying by 100 to get the percentage.
The efficiency of a machine is defined as the ratio of the work output to the work input, often expressed as a percentage. In this case, Carlota does 2000 J of work on the machine, and the machine does 500 J of work. To find the efficiency, we use the formula:
Efficiency (%) = (Work Output / Work Input) x 100
So, the calculation would be:
Efficiency (%) = (500 J / 2000 J) x 100 = 25%
The correct answer is B. 25%.
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.
A force of 310.0 N is used to push a 120 kg 30.0 m horizontally 3.00 s.
(a) Calculate the work done on the mass.
[ ] × kJ
(b) Calculate the power developed.
[ ] kW
Explanation:
We have,
Force acting on the mass is 310 N
Mass, m = 120 kg
Distance covered by the mass is 30 m
Time, t = 3 s
(a) The work done on the mass is given by the product of force and displacement such that,
[tex]W=Fd\\\\W=310\times 30\\\\W=9300\ J[/tex]
(b) The rate at which the work is done is called power developed. Its formula is given by :
[tex]P=\dfrac{W}{t}\\\\P=\dfrac{9300}{3}\\\\P=3100\ W[/tex]
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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When two bodies are charged, the total charge before and after charging remains the same because of:
a.
quantization of charges
c.
law of induction
b.
conservation of charges
d.
Coulomb’s law
Answer:
b. Conservation of charges
Explanation:
How many times louder is the intensity of
sound at a rock concert in comparison with
that of a whisper, if the two intensity levels
are 130 dB and 2 dB, respectively?
Answer:[tex]6.309\times 10^{12}[/tex]
Explanation:
Given
Intensity level of rock concert [tex]=130\dB[/tex]
Intensity level of Whisper [tex]=2\dB[/tex]
Intensity of sound is given by
[tex]I=10\log _{10}(\frac{I}{I_o})[/tex]
where [tex]I_o=10^{-12}\ watts/m^2[/tex]
and difference in the intensity of the two sounds is [tex]db=130-2=128\ dB[/tex]
and
[tex]db=10\log _{10} (\frac{I_1}{I_2})[/tex]
[tex]12.8=\log _{10}(\frac{I_1}{I_2})[/tex]
[tex]\frac{I_1}{I_2}=10^{12.8}[/tex]
[tex]\frac{I_1}{I_2}=6.309\times 10^{12}[/tex]
Thus intensity of Rock concert is [tex]6.309\times 10^{12}[/tex] times louder than that of a whisper
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
A hot air balloon contains 85,000 moles of air. To what temperature must the
air be heated to fill a volume of 2500 m at a pressure of 100 kPa? A. 260K
B. 2900 K C. 350 K
D. 0.35 K
Answer:
B is the best answer for this question
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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If you are walking or running at equal distances in equal amounts of time you are traveling at a(n) ___.
Answer:
Constant speed is your answer.
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
What was significant about the clay samples from the Western Hemisphere? How was the Alvarez hypothesis modified in response?
Final answer:
Clay samples from the Western Hemisphere are significant for studying ancient migration patterns, but they are not connected to the Alvarez hypothesis, which concerns the asteroid impact at the end of the Cretaceous period. The discussion of human migration into the Americas includes theories of both coastal and interior pathways. European contact led to diseases affecting the Indigenous population, with the post-colonization period marking the lowest numbers due to disease and conflict.
Explanation:
The significance of clay samples from the Western Hemisphere lies in their potential to provide insight into ancient migration patterns in the Americas. When discussing significant findings like clay samples or the Alvarez hypothesis, it's worth noting that the latter relates to the mass extinction at the end of the Cretaceous period, caused by an asteroid impact, rather than early human migration. Consequently, there's no direct modification of the Alvarez hypothesis in response to clay samples from the Western Hemisphere. In historical context, when dealing with human migration theories in the Americas, two predominant arguments arise: one supporting a coastal migration and the other an interior pathway. The debate over which came first remains unresolved, but both theories are supported by archaeological evidence.
As for the historical antecedents explaining why people in the Western Hemisphere became ill following contact with Europeans, it was largely due to a lack of immunity to diseases brought by Europeans, to which Indigenous populations had never been exposed. The year identified with the lowest population of Indigenous people varies according to different sources but is commonly placed after the European colonization, due to the devastating impact of disease, conflict, and dispossession.
Which diagram shows a light ray moving from a more dense into a less dense medium? A black horizontal line intersected at right angles by a dotted orange line labeled Normal. An arrow strikes the intersection point from above and continues at a shallower angle relative to the horizontal line below. A black horizontal line intersected at right angles by a dotted orange line labeled Normal. An arrow strikes the intersection point from above and continues at the same angle relative to the horizontal line above. A black horizontal line intersected at right angles by a dotted orange line labeled Normal. An arrow strikes the intersection point from above and continues at a steeper angle relative to the horizontal line below.
Answer:
its A
Explanation:
A black horizontal line intersected at right angles by a dotted orange line labeled Normal. Therefore, the correct option is option A.
What is refraction?Refraction in physics is indeed the redirection of a wave as it travels through one medium and then another. A change inside the medium or a change inside the wave's speed might both result in the redirection. Although refraction of light waves is the most often seen phenomena, refraction may also occur with sound waves as well as water waves.
The wave speed change and the initial wave propagation direction in relation to the wave speed change both affect the extent to which a wave is refracted. A black horizontal line intersected at right angles by a dotted orange line labeled Normal. This shows a light ray moving from a more dense into a less dense medium.
Therefore, the correct option is option A.
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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:
1. Calculate the velocity of a 0.8 kg kitten with a forward momentum of 5 kg*m/s.
2. The net forward force on the propeller of a 3.2 kg model airplane is 7 N. What is the acceleration of the airplane?
FIRST PERSON TO RESPOND WILL GET THE BRAINLIEST ANSWER!!
Q.1
Answer . Momentum = mass x velocity
Momentum/mass = velocity
5/0.8 = velocity
6.25 m/s = velocity
Q.2
Answer . F = ma => a = f/m => a = 7/3.2 => a = 2.1875m/s²
The velocity of a 0.8 kg kitten with a forward momentum of 5 kg*m/s is 6.25 m/s. The acceleration of a 3.2 kg model airplane with a net forward force of 7 N is 2.1875 m/s².
Explanation:To calculate the velocity of a kitten with a given momentum, we use the formula p = m * v, where p is the momentum, m is the mass, and v is the velocity. Thus, the velocity v can be calculated by rearranging the formula to v = p / m. Given a momentum of 5 kg*m/s and a mass of 0.8 kg, the kitten's velocity is v = 5 kg*m/s ÷ 0.8 kg = 6.25 m/s.
For the acceleration of the model airplane, we use Newton's second law of motion, which is F = m * a, where F is the net force, m is the mass, and a is the acceleration. With a net force of 7 N and a mass of 3.2 kg, the acceleration is a = F / m = 7 N ÷ 3.2 kg = 2.1875 m/s².
what would result from under-coverage?
a. accurate results
b. an experiment
c. lack of accurate results
d. an incorrect independent variable
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 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].
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 a rubber ball is thrown against a wall, energy is transferred and transformed. Select the
statement from the list below that does not support the law of conservation of energy. *
(1 Punto)
A. Before the ball is thrown, it has the highest potential energy due to the position of
S
in
O
B. When the ball is released, the thrower's arm transfers its energy to the ball.
O
C. After it is thrown, all of the ball's potential energy becomes kinetic energy.
O
D. When the ball hits the wall, it compresses, transforming its kinetic energy to potential energy.
E. The ball returns to its original shape and propels from the wall, transforming its potential energy to kinetic
energy.
energy.
The incorrect statement that does not support the law of conservation of energy is when the ball hits the wall, it compresses and transforms its kinetic energy to potential energy.
Explanation:The correct statement that does not support the law of conservation of energy is D. When the ball hits the wall, it compresses, transforming its kinetic energy to potential energy. According to the law of conservation of energy, energy cannot be created or destroyed, only transferred or transformed. Therefore, when the ball hits the wall, its kinetic energy is not transformed into potential energy, but rather into other forms of energy such as sound and heat.
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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.
Epeirogeny is crustal uplift without deformation. True False
Answer: True
Explanation: Epeirogeny is the regional uplift of an extensive area of the earth's crust.
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.
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:
8. What is the resistance of a 1100W hair dryer plugged into a 110V outlet with a 10A current flowing through it?
Solve using the GUESA method
Answer:
11 ohms
Explanation:
V=IR
110=10xR
R=11 ohms
Explanation:
v=IR
110=10R
R=11
resistance of the hair dryer=11
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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The right-hand rule uses the______ to predict the direction of a force on a positive charge moving in a magnetic field.
a)pointer finger
b)thumb
Answer:b
Explanation:
Thumb rule show the direction of force due to 90 degree angle.
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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A piece of aluminum requires 4,000 J of energy to change
from 68°C to 110° C. How much aluminum is there?
need help
Answer:
Mass, m = 105.58 g
Explanation:
We have,
Heat required in aluminium to change the temperature from 68°C to 110°C. It is required to find the mass of aluminium.
Concept used : Specific heat capacity
Solution,
The heat required to raise the temperature is given by :
[tex]Q=mc\Delta T[/tex]
c is specific heat capacity, for Aluminium, c = 0.902 J/g-°C
[tex]m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{4000\ J}{0.902\ J/g^{\circ} C\times (110-68)^{\circ} C}}\\\\m=105.58\ g[/tex]
So, the mass of aluminium is 105.58 grams.