what are beats?

A: periodic fluctuations int he velocity of sound waves

B: periodic fluctuations in the wavelength of sound waves

C: periodic fluctuations in the intensity of sound waves

D:periodic fluctuations in the frequency of sound waves ​

ANSWER

EXPLANATION

If force F keeps the object in equilibrium

Answer:

See below

Explanation:

Find the x components of all of the forces shown, add them together, the x-component of the force F will be exactly opposite ( same magnitude but 180 degrees different)

30 cos 55  +     40 cos 205   +   50 cos 320  =  19.26    <====x component sum of all of the forces shown

F  (the x component of ) will be   Either    - 19.26   At zero degrees

                                                                 Or 19.26 at 180 degrees

The energy source of a protostar is gravitational contraction. This gravitational contraction is what makes it possible for the protostar to become a fully-fledged star, and it is the reason why protostars are so hot and bright when they first form.

A protostar is a dense cloud of gas and dust that forms from the gravitational collapse of a molecular cloud. As the protostar collapses under the force of its own gravity, it becomes denser and hotter, eventually reaching a temperature and pressure at which nuclear fusion can occur in the core. The energy source of a protostar is gravitational contraction.

When a protostar is first formed, it is very large and diffuse, with a low density and a low temperature. However, as it continues to collapse under the force of gravity, it becomes denser and hotter, eventually reaching a temperature and pressure at which nuclear fusion can occur in the core. Nuclear fusion in the core is what powers a fully-fledged star, but before this can happen, the protostar must first collapse enough to trigger this process.

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When a rock with 200 joules of potential energy is dropped from rest on the moon, its potential energy will be converted into kinetic energy as it falls.

The rock with 200 joules of potential energy is initially at rest on the moon. As it falls towards the surface, its potential energy is converted into kinetic energy. Therefore, when it reaches the surface of the moon, all of its potential energy has been converted to kinetic energy. At the moment it hits the surface of the moon, its kinetic energy will be equal to its initial potential energy, which is 200 joules. The kinetic energy of the rock can be calculated using the formula KE = 1/2\(mv^{-2}\), where m is the mass of the rock and v is its velocity. Since we don't know the mass of the rock or the distance it has fallen, we can't determine its velocity or kinetic energy. However, we do know that the rock's kinetic energy at the moment it hits the surface of the moon is equal to the 200 joules of potential energy it had when it was dropped.

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The energy required to convert 1.70 g of ice originally at -12°C into steam at 105°C is approximately 6162.95 Joules.

To calculate this energy, we need to consider the different energy changes involved in each phase transition. First, we calculate the energy required to heat the ice from -12°C to its melting point at 0°C using the specific heat capacity of ice. Then, we calculate the energy required to melt the ice at 0°C using the heat of fusion for ice. Next, we determine the energy needed to heat the resulting water from 0°C to 100°C using the specific heat capacity of water. Finally, we calculate the energy required to convert the water at 100°C into steam at 105°C using the heat of vaporization for water. Adding up all these energy changes, we find that the total energy required is approximately 6162.95 Joules. This calculation takes into account the various temperature changes and phase transitions that the substance undergoes. It highlights the significant amount of energy needed to convert ice to steam, involving both the heating of the substance and the energy required to change its state.

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Answer:

Explanation:

The answer is [C]

There are 20,971,520 strings of eight English letters that contain no vowels when letters can be repeated.To calculate the number of strings of eight English letters that contain no vowels.

we need to consider the total number of possible choices for each letter position.

In the English alphabet, there are 26 letters, including five vowels (A, E, I, O, U) and 21 consonants.

Since we want to create strings without vowels, we can choose any of the 21 consonants for each position in the string.

For each of the eight positions in the string, there are 21 choices (consonants) available.

Therefore, the total number of strings can be calculated as:

Total number of strings = Number of choices for each position ^ Number of positions

Total number of strings = 21^8 = 20,971,520

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Yes, even without windows, you can sense the difference between uniform motion and rest or between accelerated motion and rest. This is because of the way your body experiences motion.

When the train is in uniform motion, you will feel as if you are not moving at all because your body is also moving at the same speed as the train. However, if the train suddenly accelerates or decelerates, you will feel a force pushing you forward or backward respectively, which indicates that the train is accelerating or decelerating.

So, even without windows, you can sense the difference between uniform motion and rest or between accelerated motion and rest through the forces you feel on your body.

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Answer:

The reaction force is the water pushing the swimmer in the rightward direction.

Hope you could get an idea from here.

Doubt clarification - use comment section.

Answer:

Water gains energy during evaporation and releases it during condensation in the atmosphere

Explanation:

In the water cycle, heat energy is gained or lost by water as it undergoes various processes in the cycle.

In evaporation, water molecules gains energy because the molecules of water vibrate faster and become more energetic. Hence they are able to escape into the atmosphere from the surface of the liquid.

In condensation, the molecules of gaseous water looses energy and becomes liquid.

Hence, water gains energy during evaporation and releases it during condensation in the atmosphere.

Answer:

K12 HE HE

Explanation:

The star is in energy balance when its core energy production matches the amount of energy it radiates into space. This is only true when the star is a main-sequence star with a hydrogen core fusion and when it is a helium core-fusion star. It is out of energy balance at all other times, which is why it is either contracting or expanding.

Stars can squeeze various types of atomic fuel together, and it's through this process that we get almost every element in the universe. Stars contain a lot of mass which has a lot of gravity. The gravity pulls inwards, which could cause a star to collapse in on itself. In a main sequence star, this inward pull is balanced by the outward gas pressure due to the nuclear fusion reactions deep in the star's core. This balance is called hydrostatic equilibrium and stops the main sequence stars from collapsing.

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Exaggerated feelings of self-importance are most closely linked with narcissism. Narcissism is a personality trait characterized by an inflated sense of self-worth, an excessive need for admiration, and a lack of empathy towards others.

Individuals with narcissistic traits often believe they are superior to others, crave attention and validation, and have a grandiose self-image.

They may engage in self-promotion, seek constant admiration, and exploit others for personal gain. Narcissism is associated with a sense of entitlement, a tendency to manipulate and exploit others, and a lack of empathy or concern for the well-being of others.

While a certain level of self-confidence and self-esteem is healthy, excessive narcissism can negatively impact relationships, lead to interpersonal conflicts, and hinder personal growth and development.

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In the electromagnetic spectrum the greater the frequency the smaller the wavelength, then is the frequency is the lowest in the light spectrum the light will have the longest wavelength. Therefore, the answer is b.

Answer:

Photosynthesis

Explanation:

Studies about the time period of oxygen accumulation suggests that free oxygen was first produced by prokaryotic and then later by eukaryotic organisms in the ocean. These organisms carried out photosynthesis more efficiently, producing oxygen as a waste product.

The organism mainly responsible for this is known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, oxygen.

The substance likely to be produced when the dissolved oxygen in a lake is depleted is A) methane.

When the dissolved oxygen in a lake is depleted, anaerobic conditions prevail, leading to changes in the microbial processes. Methane (CH₄) is commonly produced in oxygen-depleted environments such as stagnant water bodies, wetlands, and sediments.

Methane is a byproduct of anaerobic decomposition of organic matter by methanogenic archaea. These microorganisms produce methane as a metabolic end product in the absence of oxygen.

On the other hand, hydrogen (H₂) is not typically produced as a result of oxygen depletion in a lake. Nitrite (NO₂⁻) and bicarbonate (HCO₃⁻) are not direct products of oxygen depletion but can be influenced by other biogeochemical processes in the lake, such as nitrogen cycling and carbonate system dynamics.

Methane production is a characteristic response in oxygen-depleted environments and serves as an indicator of anaerobic conditions.

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The fringe occurs at an angle of approximately 0.0449 radians.

The angle at which the fringe that is most distant from the central bright fringe occurs can be determined using the formula:

θ = λ / d,

where θ is the angle, λ is the wavelength of the light, and d is the separation between the slits.

Substituting the given values into the formula, we have:

θ = (589 nm) / (0.0131 mm)

= (589 x 10⁻⁹ m) / (0.0131 x 10⁻³ m)

= 0.0449 radians.

Therefore, the fringe that is most distant from the central bright fringe will occur at an angle of approximately 0.0449 radians relative to the original direction of the beam.

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weber's law demonstrates that two stimuli must differ by aconstant minimum amount and not cionstant minimum percentage is true.

Weber's Law asserts that for two stimuli to be viewed as different, there must be a constant percentage change rather than a constant absolute quantity of change. In other words, the more intense a stimulus is, the more it must alter for us to perceive a difference.

Priming demonstrates that humans can process information from stimuli that are less than our absolute threshold for conscious awareness.

According to the Max Weber Theory of Bureaucracy, all company duties must be distributed among staff.

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A truck is traveling at a constant velocity of 30 m/s. It  will take the time to travel 1000 meters is (t)=33.33 S.

The velocity means the ratio of distance and time. Mathematically it means the distance divided by time. It can be measured in m/s and cm/s.

To calculate the time we are using thee formula here is,

S=vt

Or, t=S/v

Here we are given,

S = The covered distance of the car = 1000 m

v= The velocity of the car. = 30 m/s.

We have to calculate the time taken by truck = t

Now we put the values in the above equation, we get

t=S/v

Or, t=1000/30

Or, t=33.33 S

From the calculation we can say that,  It will take the time to travel 1000 meters is (t)=33.33 S.

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The characteristic of waves that remains unchanged when it enters a distinct medium is the frequency (Option B).

The expression 'wave frequency' indicates the period of time or occurrence of a particular type of wave.

In conclusion, the characteristic of waves that remains unchanged when it enters a distinct medium is the frequency (Option B).

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Answer: B. frequency

Explanation: plato answer :)

Answer:

60 sec

Explanation:

60m because in every 30min in 2sec so 30 × 2= 60 min

V = 200.16 volts

Explanation:

V= IR

= (1.39 A)(144 ohm)

= 200.16 volts

Answer:

200.16

Explanation:

acellus

1.  The value of sin 2x 2x is 1. option C

2. The domain of f(x) = 1 / (x-1) is all real numbers except for R-{1},

3. An atmosphere is unit of None. Option D

4. Universal gravitational constant (G) is not related to  kg⁻¹m⁻²s³. Option B

5.  Force and power are physical quantities with different dimensions. Option C

6. Heat transfer fastest on: Conduction > Convection > Radiation.

7. One joule of work done in one second by unit positive charge is 1 watt. Option A

An atmosphere is a unit of pressure. It is defined as the pressure exerted by a column of air 10 meters high at sea level. Therefore, none of the provided options; air, thunder, force, are correct.

It is also important to note that the rate at which heat transfer occurs depends heavily on the context.

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The bottleneck event of the plants in an area results in secondary succession.

A bottleneck is an event that drastically reduces the population size of an organism. The bottleneck may be caused by various events, such as an environmental disaster, the hunting or habitat destruction that results in the deaths of organisms.

Secondary succession is a type of ecological succession in which plants and animals recolonize a habitat after a major disturbance such as a devastating flood, wildfire, landslide, lava flow, or human activity e.g., farming or road or building construction.

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The magnitude of the rock's acceleration half-way between two planets is 1.086 m/s².

The given parameters;

   mass of planet, A = 3M

   radius of the planet A, = R

   mass of planet B, = 4M

   radius of planet B, = 2R

   distance between the two planets, r = 8R

The gravitational force half-way (4R) between the two planets is calculated from Newton's universal gravitational law as follows;

SEE IMAGE 1

The magnitude of the rock's acceleration is calculated from Newton's second law of motion as follows;

SEE IMG 2

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Answer:

We can use Coulomb's law to solve this problem:

F = k * q1 * q2 / r^2

where F is the force between the two charges, k is Coulomb's constant (k = 9 x 10^9 N m^2 / C^2), q1 and q2 are the magnitudes of the charges, and r is the distance between them.

We know the force F, the distance r, and the magnitude of one of the charges q1. We can rearrange the equation to solve for the magnitude of the other charge q2:

q2 = F * r^2 / (k * q1)

Substituting the values we have:

q2 = (250 N) * (0.15 m)^2 / (9 x 10^9 N m^2 / C^2 * 6.5 x 10^-5 C)

Simplifying:

q2 = 8.65 x 10^5 C

Therefore, the magnitude of the other charge is 8.65 x 10^5 C.

The frequency of light with a wavelength of 249 nm is 1.20 × 10^15 s^-1. This means that this light has a very high frequency and is in the ultraviolet region of the electromagnetic spectrum.

The frequency of light having a wavelength of 249 nm can be determined using the equation c = λν, where c is the speed of light, λ is the wavelength of the light, and ν is the frequency of the light. The speed of light is 3.00 × 10^8 m/s.The given wavelength of light is 249 nm. To use the equation, the wavelength needs to be converted from nanometers to meters. There are 10^9 nanometers in one meter.

Thus, the wavelength is: λ = 249 nm × (1 m / 10^9 nm) = 2.49 × 10^-7 m. Substituting the given values into the equation and solving for ν, we get: 3.00 × 10^8 m/s = (2.49 × 10^-7 m) νν = (3.00 × 10^8 m/s) / (2.49 × 10^-7 m)ν = 1.20 × 10^15 s^-1. Therefore, the frequency of light with a wavelength of 249 nm is 1.20 × 10^15 s^-1. This means that this light has a very high frequency and is in the ultraviolet region of the electromagnetic spectrum.

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Answer:

1. Water pump

2. Radiator

3. Thermostat

4. AntiFreeze

5. Bypass Valve

6. Thermo switch

7. Radiator hoses

8. Fan

9. Water Pump Impeller

10. Core

Explanation:

Based on Cooling System Fundamentals, we have the following;

1. Coolant is forced through the engine and other system parts by the WATER PUMP.

2. The RADIATOR transfers engine coolant heat to the outside air.

3. Coolant flow and engine operating temperature are controlled by the THERMOSTAT.

4. ANTIFREEZE is mixed with water to produce the engine coolant.

5. A(n) BYPASS VALVE permits coolant circulation through the engine when the thermostat is closed.

6. The fan switch, or THERMO SWTICH is a temperature-sensitive switch that controls fan motor operation.

7. The engine is connected to the radiator by the RADIATOR HOSES.

8. The FAN draws air through the radiator.

9. A disc with fan-like blades that spins and produces pressure and flow is known as a(n) WATER PUMP IMPELLER

10. The center section of the radiator made up of tubes and cooling fins is called the CORE.

The factor that does NOT influence wind speed and direction is radiation. Hence, the correct option is (e). The factor that does NOT influence wind speed and direction is radiation.

The other four factors that influence wind speed and direction are friction, pressure gradient, Coriolis effect, and high-to-low pressure difference.

Pressure gradients usually develop due to unequal heating of the atmosphere. Hence, the correct option is (c). Pressure gradients usually develop due to unequal heating of the atmosphere.

Pressure gradients occur due to differences in air temperature, which cause pressure differences. Areas with warmer air will have lower pressure while those with cooler air will have higher pressure.

The wind blows from the sea to land because warm land has low pressure and cooler sea has higher pressure is the best description of how a sea breeze works. Hence, the correct option is (a).

A sea breeze is a type of local wind that blows from the sea towards the land. This occurs because during the day, the land heats up faster than the sea, causing the air above it to rise.

This creates a low-pressure area above the land. At the same time, the sea remains cooler, and the air above it is denser, creating a high-pressure area. The air flows from the high-pressure area (the sea) to the low-pressure area (the land), creating a sea breeze.

This breeze usually occurs in the afternoon when the temperature difference between the land and sea is greatest. It helps to cool down the land and bring moisture from the sea to the land.

The sea breeze is a result of differences in air temperature and pressure between the land and sea, with the wind flowing from high to low pressure, bringing moisture to the land and cooling it down.

Winds are bent to the right from the flow driven by the pressure gradient in the northern hemisphere, based on the Coriolis effect. Hence, the correct option is .

Based on the Coriolis effect, winds are bent to the right from the flow driven by the pressure gradient in the northern hemisphere. The Coriolis effect occurs due to the Earth's rotation, causing moving objects such as wind to deflect to the right in the northern hemisphere and to the left in the southern hemisphere.

The frictional force works opposite the motion of the wind, slowing it down. Hence, the correct option is (e). The frictional force works opposite the motion of the wind, slowing it down.

Friction occurs when the wind blows over the surface of the Earth, causing drag and slowing down the wind. The frictional force works opposite to the direction of the wind, with the greatest friction near the surface and decreases with height.

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According to the question **Effect of the Sun shrinking on Earth's orbit.**

The length of a year would **decrease to 1/100 as long** if the Sun shrunk from its current diameter to 1/10 its current diameter while maintaining the same mass. This decrease in the Sun's diameter would result in a decrease in the gravitational pull experienced by the Earth, leading to a reduction in the orbital period.

According to Kepler's third law of planetary motion, the square of a planet's orbital period is proportional to the cube of its average distance from the Sun. As the Sun's diameter decreases, the average distance between the Sun and the Earth would remain relatively unchanged. Therefore, with a smaller diameter, the gravitational force exerted by the Sun on the Earth would be weaker, causing the Earth to orbit at a faster rate.

Hence, the length of a year would decrease significantly, becoming approximately 1/100 as long compared to its original duration.

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