In the illustration above the moon is in the position called

new moon



moonstone



full moon



bright moon

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.

Answer:

b. Conservation of charges

Explanation:

Answer:b

Explanation:

Thumb rule show the direction of force due to 90 degree angle.

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.

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.

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%.

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.

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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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.

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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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.

Answer:

2,200 Watts

Explanation:

The power of the truck is "2200 W".

Given:

Force,

Distance,

Time,

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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Answer:

B is the best answer for this question

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].

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:

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

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.

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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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.

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.

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]

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

Answer: True

Explanation: Epeirogeny is the regional uplift of an extensive area of the earth's crust.

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.

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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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.

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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Answer:

Constant speed is your answer.

Explanation:

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.

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 .

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.

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.

Examples of metal are potassium, calcium.

Therefore, option D is correct, because both metals and metalloid are seen as solid under room temperature.

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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:

Answer:

11 ohms

Explanation:

V=IR

110=10xR

R=11 ohms

Explanation:

v=IR

110=10R

R=11

resistance of the hair dryer=11

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.