if the shm is described as x(t) = 0.5cos(20t ), the magnitude of the maximum acceleration is

Answer:

Mount Everest formed from a tectonic smashup between the Indian and Eurasian tectonic plates tens of millions of years ago.

Explanation:

Answer:

The answer is B.

Explanation:

A Block has a density of 0.97 g/cm 3. That is why 97 percent of the ice will sink in below the water.

Answer:

75%(TT,Tt,tt) Hope that helps

Answer:

C: it ignores parts of the method within an investigation

Answer:

Its A ik cuz i just studied it when i was answering this question...

Explanation:

have a good day!

Light-speed gravitational waves are produced (186,000 miles per second). As they pass past, these waves compress and stretch everything in their path. An undetectable ripple in space is known as a gravitational wave.

A natural consequence of Albert Einstein's general theory of relativity, which states that extremely heavy objects disrupt the fabric of time and space—an effect we experience as gravity—could be gravitational waves, according to an idea he made in 1916. Einstein's realization that the speed of light remains constant regardless of the motion of the light source forms the foundation of the Special Theory of Relativity. The speed of the light source and the speed of the light beam should be added to find the overall speed, but this is not how light operates.

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Answer:

Mass = 64,870,000,000 kilograms

Explanation:

Given the following data;

Density = 998 kg/m³

Volume = 6,500,000 m³

To find the mass of water in the reservoir;

Density can be defined as mass all over the volume of an object.

Simply stated, density is mass per unit volume of an object.

Mathematically, density is given by the equation;

Density = mass/volume

Making mass the subject of formula, we have;

Mass = density * volume

Mass = 998 * 6,500,000

Mass = 64,870,000,000 kilograms

Explanation:

First train has 2 hr * 45 km/hr = 90 km   head start

  Closing speed between the two trains   745 - 45 = 30 km

to cover the 90 km between them will take 3 hours

  and the second train will be at  75 km/hr * 3 hr = 225 km from the station

The universal law of gravitation says that the gravitational force between the two masses is

F₁ = G m₁ m₂ / r ² = 6.0 × 10⁻⁶ N

where r = 12 m. When the distance between the two masses is reduced to R = 4 m, i.e. 1/3 of the original distance r, we have

F₂ = G m₁ m₂ / R ² = G m₁ m₂ / (r/3)² = 1/9 G m₁ m₂ / r ² = 1/9 F₁

so that the resulting gravitational force has 1/9 the first magnitude, or

F₂ = 1/9 (6.0 × 10⁻⁶ N) ≈ 6.7 × 10⁻⁷ N

The density of a fish is controlled by the expansion and contraction of its air sacs while the density of a submarine is controlled by ballast tanks. It was emphasized earlier that buoyant forces does not equal an objects weight but does equal the weight of displaced water.

The three most fundamental characteristics of an object are mass, volume, and density. Volume indicates something's size, mass indicates how heavy it is, and density is calculated as mass divided by volume. Although you deal with mass and volume on a daily basis, the concept of density is less clear-cut and requires careful consideration.

Mass divided by density equals volume; and. Volume times density equals mass. A liquid's density is a gauge of how heavy it is relative to the amount being measured. The liquid that weighs heavier is more dense if you weigh two liquids with similar volumes or amounts.

The relationship between a substance's mass and the amount of space it occupies is known as its density (volume). The density of a substance is determined by the mass, size, and arrangement of its atoms.

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Answer:

14 m/s^2

Explanation:

Use the formula to get the velocities at 2, and 5 seconds.

Then use the average acceleration formula.

Answer:

Explanation:

Heat is transferred in the following ways listed below

1. Conduction(Through direct contact of particles )

2. Convection(Through motion of hot and cold liquid )

3. Radiation(Through electromagnetic waves Through the rising of a warm gas )

1. Conduction: This has to do with the transfer of heat from one medium to another having direct contact with each other, the medium can either be solid or liquids

2. Convection: Has to do with the transfer of heat energy via molecules of the liquids in motion with different or varying temperature gradients

3. Radiation: Mostly occurs in gases, it is the transfer of energy through waves

Based on the linear model, the estimated temperature at which water will boil on Pike's Peak is approximately 185.4 degrees Fahrenheit.

To find the equation that best models the relationship between the temperature at which water boils (t) and the altitude (h), we can use a graphing utility to plot the data points and perform linear regression.

After plotting the data points, we can see that they approximately form a straight line. By performing linear regression, we can determine the equation of this line. The equation will be of the form t = mx + b, where m represents the slope of the line and b represents the y-intercept.

Using the graphing utility, we find that the equation that best fits the data is t = -0.023h + 212.8. This equation represents the linear relationship between the altitude and the boiling point temperature of water.

To estimate the temperature at which water will boil on Pike's Peak, which is 14,115 feet above sea level, we can substitute the altitude value into the equation:

t = -0.023(14115) + 212.8 ≈ 185.4 degrees Fahrenheit.

Therefore, based on the linear model, the estimated temperature at which water will boil on Pike's Peak is approximately 185.4 degrees Fahrenheit.

It's important to note that this estimation is based on the assumption that the relationship between altitude and boiling point temperature remains linear within the given altitude range.

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Answer:

21: Mass

22: Unbalanced Force

23: Friction

24: Balanced

Explanation:

Explanation:

The speed of light in air is approximately 300,000,000 meters per second. The speed of sound in air is approximately 343 meters per second. Light is the propagation of electromagnetic waves, while sound is the physical vibration of the medium

a) The rate at which the object is speeding up at P can be found by taking the dot product of the acceleration vector and the unit tangent vector.

(4,5) · Jo(-3,1) = 4*(-3) + 5*1 = -12+5 = -7 ft/s^2

The rate of change of speed at P is -7 ft/s^2.

b) The object's speed at P can be found using the formula for curvature and speed:

Speed = Curvature * radius

In this case, the curvature is 0.8 ft^-1 and the radius is not given, so we can't find the exact speed of the object, however, we can use the relation between the curvature and the acceleration vector.

Acceleration vector = curvature * Speed * Unit Tangent vector

√(4^2 + 5^2) = √(25+16) = √(41) = sqrt(41) = 6.4 ft/s

The object's speed at P is 6.4 ft/s.

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Answer:

Railroad Scale?

Explanation:

If the star radiates uniformly in all directions, the total power output of the star is 2.37 x 10²⁷ W.

The formula for the intensity of the light at a distance R from the source of light (which is star in this case) is given by,

I = P/A

I is the intensity,

P is the power,

A is the area.

We can write,

P = IA

Intensity is given to be 15.4 W/m².

A = πR²

Here, we will take the value of R is 7 x 10¹² m.

So,

A = π( 7 x 10¹²)²

Putting the values,

P = IA

P = 15.4 x π x ( 7 x 10¹²)²

P = 2.37 x 10²⁷ W.

The power output of the star is 2.37 x 10²⁷ W.

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(i)Therefore, it takes approximately 9.27 hours to reach its full power output.(ii)It is necessary to have quick-start power sources, this helps maintain a stable and reliable electricity supply even when wind speeds fluctuate.(c)The Bremsstrahlung effect needs to be considered to ensure proper radiation protection.(d) The near-field region is characterized by strong electric and magnetic fields while the far-field region represents the radiation zone.

(i) To calculate the time it takes for the power station to reach its full power output, we can use the formula:

Energy = Power × Time

Given that the power station generates 6120 MWh of energy over a 10-hour period and the rated power at full capacity is 660 MW, we can rearrange the formula to solve for time:

Time = Energy ÷ Power

Converting the energy to watt-hours (Wh):

Energy = 6120 MWh × 1,000,000 Wh/MWh = 6,120,000,000 Wh

Converting the power to watt-hours (Wh):

Power = 660 MW × 1,000,000 Wh/MW = 660,000,000 Wh

Now we can calculate the time:

Time = 6,120,000,000 Wh ÷ 660,000,000 Wh ≈ 9.27 hours

Therefore, it takes approximately 9.27 hours (or 9 hours and 16 minutes) for the power station to reach its full power output.

(ii) The type of power station that can be started up fastest is a gas-fired power station. Gas-fired power stations can reach full power output relatively quickly because they use natural gas combustion to produce energy.

In contrast, other types of power stations, such as coal-fired or nuclear power stations, have longer start-up times. Coal-fired power stations require time to heat up the boiler and generate steam, while nuclear power stations need to go through a complex series of procedures to ensure safe and controlled nuclear reactions.

This is relevant to optimizing the usage of windfarms because wind power is intermittent and dependent on the availability of wind. This helps maintain a stable and reliable electricity supply even when wind speeds fluctuate.

(c) The Bremsstrahlung effect is a phenomenon that occurs when charged particles, such as electrons, are decelerated or deflected by the electric fields of atomic nuclei or other charged particles. As a result, they emit electromagnetic radiation in the form of X-rays or gamma rays.

In shielding design, the Bremsstrahlung effect needs to be considered to ensure proper radiation protection. These materials effectively absorb and attenuate the emitted X-rays and gamma rays, reducing the exposure of individuals to harmful radiation.

(d) The electromagnetic field output from an antenna can be represented by two main regions:

Near-field region: This region is closest to the antenna and is also known as the reactive near-field. It extends from the antenna's surface up to a distance typically equal to one wavelength. In the near-field region, the electromagnetic field is characterized by strong electric and magnetic field components.

Far-field region: Also known as the radiating or the Fraunhofer region, this region extends beyond the near-field region.The electric and magnetic fields are perpendicular to each other and to the direction of propagation.  The far-field region is further divided into the "Fresnel region," which is closer to the antenna and has some characteristics of the near field, and the "Fraunhofer region," which is farther away and exhibits the properties of the far-field.

The transition between the near-field and the far-field regions is gradual and depends on the antenna's size and operating frequency. The size of the antenna and the distance from it determine the boundary between these regions.

In summary, the near-field region is characterized by strong electric and magnetic fields, while the far-field region represents the radiation zone where the energy is radiated away as electromagnetic waves.

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Answer:

The observer will say that galaxy 2 is moving away from galaxy 3 where he stands.

Explanation:

Since the galaxies are expanding, each one would move away from the others. Observers on all three galaxies have their frame of reference fixed on their own galaxies. Judging from their own galaxies, each observer will perceive the other galaxies moving away from his/or galaxy.

The observer at galaxy 3 will talk about galaxy 2 by doing is; he will say that galaxy 2 is moving far from him.

We are told that the universe is expanding and as such, the galaxies would be expanding and moving away from each other.

Since the galaxies are expanding, it means that they will be moving away from each other.

From time dilation principle, an observer at galaxy 3 will say that galaxy 2 is moving far from him.

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Answer:

Friction (traction) is the resistance between things. There's friction between your shoes and the ground. Without enough friction, you can slip and fall.

When you push a heavy box, it pushes back at you with an equal and opposite force (Third Law) so that the harder the force of your action, the greater the force of reaction until you apply a force great enough to cause the box to begin sliding.

When a person trips over a heavy box and falls to the floor, it's due to a combination of factors related to the laws of physics. Here's what happens:

1. Inertia: Every object tends to remain at rest or in uniform motion unless acted upon by an external force. This is Newton's first law of motion. When you're walking and suddenly trip over a heavy box, your body's forward motion is abruptly interrupted by the box. Your lower body and legs might still have forward momentum, causing you to stumble or fall.

2. Force of Gravity:The heavy box you trip over exerts a force of gravity on your body. When you collide with the box, this force pulls you downward, accelerating your fall towards the ground.

3. Friction and Contact Forces: When you trip over the box, there are contact forces and frictional forces involved. Your foot might get caught on the box, and the friction between your foot and the surface of the box can cause your body to tilt forward. As a result, you lose your balance.

4. Center of Mass: Your body's center of mass is the point around which your weight is evenly distributed. When you trip and lose your balance, your center of mass might shift outside your base of support (your feet), causing you to tip over and fall.

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Answer:

29.39 kg

Explanation:

From the question,

W = mg...................... Equation 1

Where W = weight of the cuboid box, m = mass of the cuboid box, g = acceleration due to gravity.

make m the subject of the equation

m = W/g.................. Equation 2

Given: W = 288 N

Constant: g = 9.8 m/s²

Substitute these values into equation 2

m = 288/9.8

m = 29.39 kg

Answer:

\(\fbox {3.6kW}\)

Explanation:

Formula used :

\(\boxed {P = F \times v} \leftarrow \rightarrow \boxed {P = \frac{F \times S}{t}}\)

Given :

⇒ F = 6 × 10³ N

⇒ S = 18 m

⇒ t = 30 s

Solving :

⇒ P = 6 × 10³ × 18 / 30

⇒ P = 2 × 100 × 18

⇒ P = 3600 W

⇒ P = 3.6kW

The invention of sonar, which stands for "sound navigation and ranging," revolutionized underwater navigation and detection by using sound waves. Before the development of sonar, there was an assumption that sound traveled in a straight line underwater, similar to how it does in air. However, this assumption was proved wrong after the invention of sonar.

Sonar works by emitting sound waves into the water and then measuring the time it takes for the sound waves to bounce back after hitting an object. By analyzing the returned sound waves, sonar systems can determine the distance, direction, and shape of underwater objects or features. This technique was initially based on the assumption that sound waves would travel in a straight line underwater, just as they do in the air.

However, sonar experiments and observations revealed that sound waves in water are affected by various factors, such as temperature, salinity, and pressure. These factors can cause sound waves to refract (bend) and reflect off underwater surfaces, leading to complex paths and interactions. As a result, the assumption of straight-line sound propagation was proven wrong.

The understanding of sound behavior underwater and the corrections made to sonar techniques allowed for more accurate mapping of underwater environments, detection of underwater objects, and navigation of submarines and ships. By accounting for the effects of refraction and reflection, modern sonar systems can provide precise and reliable information about underwater conditions, contributing to a wide range of applications in marine exploration, navigation, and scientific research.

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The distance between the food medium and the magnetron is not important to the determination of cc in this experiment because the measurement of the dielectric constant of a food material is independent of the distance between the food medium and the magnetron.

The measurement of the dielectric constant of a food material is based on the amplitude of the electromagnetic wave, which is not affected by the distance between the food medium and the magnetron. Therefore, the distance between the food medium and the magnetron is not important to the determination of cc in this experiment.

The equation to calculate cc in terms of dd rather than λ is given below;

cc=λ(2dd)λ=cc/2dd

Where cc is the velocity of light, dd is the distance between the two plates of a capacitor, and λ is the wavelength of light.

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Answer:

Divide by the number 100

Explanation:

Since there are 100 centimeters in 1 meter, we can see that if you are given a number in centimeters, the number of meters is that number divided by 100. Hope this helps!

Answer:

Divide by 100

Explanation:

Explanation:

4.2 km / 7 min

IS already speed.

as

speed = distance / time

but it probably means a standardized speed like

km/h = km / 1 hour

so, we have the fraction (every ratio is audio a fraction)

4.2 km / 7 min = 0.6 km / 1 min

aha, and now we only need to multiply this by 60/60 to get the speed as per 1 hour (remember, 1 hour = 60 minutes) :

0.6/1 × 60/60 = 0.6×60 / (1×60) = 36/60 = 36 km/h

Answer:

36

Explanation:

v=d/t

where

d=4.2 km

t=7 minutes/60 minutes (using conversion)
t=.1166666667 H
so,
v=4.2 km/.117 H
v=36 km/H