A baby crawls from x=1.0m to x=4.25m at an average velocity of 0.226m/s. how much time did it take

Astronomers can now report that active star formation was going on at a time when the universe was only 20% as old as it is today. when astronomers make such a statement, they examine the spectra of galaxies (or the overall colors of galaxies) with the highest redshifts they can find.

SO option B is correct.

An astronomer is described as a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth by observing astronomical objects such as stars, planets, moons, comets and galaxies – in either observational or theoretical astronomy.

Astronomers are known to use redshifts to measure how the universe is expanding, and thus to determine the distance to our universe's most distant and therefore oldest objects.

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Answer:

\(\text{Weight} = \text{Mass} \times \text{Gravitational acceleration}\)

Explanation:

Answer:

Like other emissions resulting from fossil fuel combustion, aircraft engines produce gases, noise, and particulates, raising environmental concerns over their global effects and their effects on local air quality.[2]Jet airliners contribute to climate change by emitting carbon dioxide (CO2), the best understood greenhouse gas, and, with less scientific understanding, nitrogen oxides, contrails and particulates. Their radiative forcing is estimated at 1.3–1.4 that of CO2 alone, excluding induced cirrus cloud with a very low level of scientific understanding. In 2018, global commercial operations generated 2.4% of all CO2 emissions.

Between 1940 and 2018, aviation CO2 emissions grew from 0.7% to 2.65% of all CO2 emissions.[1]

Jet airliners have become 70% more fuel efficient between 1967 and 2007, and CO2 emissions per Revenue Ton-kilometer (RTK) in 2018 were 47% of those in 1990. In 2018, CO2 emissions averaged 88 grams of CO2 per revenue passenger per km. While the aviation industry is more fuel efficient, overall emissions have risen as the volume of air travel has increased. By 2020, aviation emissions were 70% higher than in 2005 and they could grow by 300% by 2050.

Aircraft noise pollution disrupts sleep, children's education and could increase cardiovascular risk. Airports can generate water pollution due to their extensive handling of jet fuel and deicing chemicals if not contained, contaminating nearby water bodies. Aviation activities emit ozone and ultrafine particles, both of which are health hazards. Piston engines used in general aviation burn Avgas, releasing toxic lead.

Aviation's environmental footprint can be reduced by better fuel economy in aircraft or Air Traffic Control and flight routes can be optimised to lower non-CO2 effects on climate from NO

x, particulates or contrails. Aviation biofuel, emissions trading and carbon offsetting, part of the ICAO's CORSIA, can lower CO2 emissions. Aviation usage can be lowered by short-haul flight bans, train connections, personal choices and aviation taxation and subsidies. Fuel-powered aircraft may be replaced by hybrid electric aircraft and electric aircraft or by hydrogen-powered aircraft.

When a cold air mass and a warm air mass meet but are at a standstill, the boundary is called a stationary front. This is a boundary between two air masses, one of which is warmer and the other of which is colder.

When they meet, they cannot mix because of their differences in temperature and density. As a result, they remain stagnant and stationary. The cold front is a front formed when a cold air mass displaces a warm air mass, and the warm front is a front formed when a warm air mass displaces a cold air mass.

However, a stationary front is formed when neither air mass advances. A stationary front is identified by the blue triangles and red half-circles that alternate on opposite sides of a line on a weather map. A stationary front produces cloudy skies and moderate rainfall or snowfall.

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Answer:

P = 2 pi (L / g)^1/2

Let 1 represent earth and 2 the moon

P2^2 / P1 ^2 = L2 g1 / (L1 g2)       dividing equations

L2 = (P2 / P1)^2 * g2 / g1 * L1

L2 = 1 * 1.62 / 9.80 * 1.9 = .314 m

Answer:B

Explanation:

.03 of an hr is 2 mins and if it takes 2 mins to drive 4 miles enter it in pace calulator you are going 120mph so the closest to 120 is 133mph

The kid is breaking the speed limit of 45 miles/hr since he is going at 133.3 miles/hr.

Speed is the ratio of distance travelled to time taken. It is given by:

Speed = distance / time

Since the distance to the mall is 4 miles, the time taken is 0.03 hours, hence the speed is:

Speed = distance / time

Speed = 4 miles / 0.03 hours

Speed = 133.3 miles/hr

Hence the kid is breaking the speed limit of 45 miles/hr since he is going at 133.3 miles/hr.

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The rate of vibration of a sound is called its frequency.

Frequency is measured in hertz (Hz), and it is the number of times a sound wave vibrates per second. The higher the frequency, the higher the pitch of the sound. For example, a piccolo has a higher frequency than a tuba, so it has a higher pitch.

Response, vibration, and decibel are all related to sound, but they are not the same as frequency. Response is how the ear and brain react to sound. Vibration is the movement of air molecules that creates sound waves. Decibel is a unit of measurement for sound intensity.

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The tides with the biggest difference between high and low water are called springs and those with the smallest are called neaps. Spring tides happen just after every full and new moon, when the sun, moon and earth are in line.

When the tide is low, the Moon faces the Earth at a straight angle to the Sun, which causes the Moon and Sun's gravitational pull to be antagonistic. These tides are known as neap tides, which are low tides or tides that are lower than usual.

People frequently refer to abnormally high tides with the non-scientific term "king tide." Tides are long-period waves that travel around the world as the ocean is "tugged" back and forth by the sun's and the moon's gravitational pulls when these bodies interact with the Earth in their monthly and yearly orbits.

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Answer:

No, it is not necessary for them to have same mass.

Explanation:

Let both bodies have a density d1 and d2 respectively.

Since their volumes are equal V1 = V2

we know that, https://tex.z-dn.net/?f=%5Cfrac%7Bmass%7D%7Bvolume%7D

Hence, d1 =  and d2 =    

Taking the ratio of densities,we get

This implies that unless the bodies have same densities, the mass of the two bodies will not be same.

If the elevator falls from a height of 240 meters and Superguy is 1 km away, he will have 6.5 seconds to save Lois, which means that his average speed must be 150 meters per second.

The total distance traveled by an object divided by the total time taken is the average speed.

The average speed of an object indicates the pace at which it will traverse a distance. The metric unit of speed is the meter per second.

Given data:

Distance of super guy from the tower = 1.00 km

height(h)= 240 m

From the Newtons' second equation of motion:

\(\rm S= ut+\frac{1}{2} at^2 \\\\\ 210 = 0+\frac{10}{2} t^2 \\\\ t= \sqrt 42\\\\t=6.5 \ sec\)

Distance is the foundation as the product the velocity and time;

D=ut

u=d/t

u=1000/t

u=1000/6.5

u=150 m/sec

Hence, he will have 6.5 seconds to save Lois, which means that his average speed must be 150 meters per second.

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Answer:

\(\huge\boxed{\sf a = -2 \ m/s^2}\)

Explanation:

Initial velocity = \(V_i\) = 20 m/s

Final velocity = \(V_f\) = 12 m/s

Time = t = 4 s

Acceleration = a = ?

\(\displaystyle a = \frac{V_f-V_i}{t}\)

Put the given data in the above formula.

\(\displaystyle a =\frac{12 - 20}{4} \\\\a =\frac{-8}{4} \\\\a = -2 \ m/s^2\\\\\rule[225]{225}{2}\)

Answer:

are used by geneticists to determine the probability of different offspring genotypes.

A live electrical circuit is one that is being supplied with energy . The option A is correct answer.

A live electrical circuit refers to a circuit that is currently being supplied with electrical energy. This means that the circuit is actively conducting electricity and poses potential hazards if not handled properly. It is crucial to exercise caution when working with live circuits, as they carry the risk of electric shock or fire.

Therefore, live circuits should be approached with care and appropriate safety measures, such as wearing protective gear and ensuring the power source is properly shut off before working on them.  A live electrical circuit is a circuit that is connected to a power source and actively conducting electricity.

It means that the circuit is energized and has the potential to deliver electrical energy to connected devices or components. When a circuit is live, it carries electrical current, which consists of the movement of charged particles, usually electrons, through a conductive path.

This movement of electrons creates an electric field and can produce various effects, such as generating heat, producing light, or powering electrical devices. Working with live circuits can be dangerous if proper precautions are not taken.  So, the correct answer is option A.

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The value of speedmph after calling the function calculatemph, given that distancemiles equals 1870, timesecs equals 343440, and speedmph equals 55.0, cannot be determined without further information.

The function calculatemph is not defined, and there is no information provided about how it operates or what its purpose is. Without knowing the specific calculations or transformations performed by the calculatemph function, it is not possible to determine the resulting value of speedmph after calling it.

To determine the value of speedmph after calling calculatemph, we would need additional information about the function's implementation or any relationships between the given variables. Without this information, it is not possible to provide a specific answer.

If more details or the actual implementation of calculatemph were provided, it would be possible to analyze the function and determine its effect on the value of speedmph.

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Answer:

Chlorine 35:

Atomic mass 35.43

Number of protons 17

Number of electrons: 17

Number of neutrons: 18

Explanation:

Option (a) "16" is the best prediction for the number of nails the electromagnet with 48 coils will pick up.

To determine the best prediction for the number of tacks the electromagnet with 48 coils will pick up, we need to examine the relationship between the number of coils and the number of tacks picked up by the electromagnets. From the results given, it appears that as the number of coils increases, the number of tacks picked up also increases.

Based on this relationship, it's reasonable to predict that the electromagnet with 48 coils will pick up more tacks than the one with 36 coils. Given that the electromagnet with 36 coils picked up 13 tacks, a reasonable prediction for the number of tacks the electromagnet with 48 coils will pick up would be between 13 and 20.

In conclusion, a prediction of 16 or 17 tacks for the electromagnet with 48 coils is likely to be a good estimate, given the data provided.

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Answer: The answer is (16)                                                    

Explanation:

My answer didn't save :(

5 meters per second

11.1845 miles per hour

50/10=5

Newton's law of universal Gravity:

F = G * (M1 * M2)/ r^2

Where:

G = gravitational constant = 6.674 x10^-11 Nm^2kg^2

M1 = mass 1 = 45.9 kg

M2 = mass 2 = 5.98 x 10 ^24 kg

r = Distance between the 2 objects = 6.38 x 10 ^6 m

Replacing;

F = 450.048 N

Answer:

Increasing the sample size could make a small difference between means reach statistical significance because;

a) As N increases the standard error gets smaller reflecting less variability in sample means, which allows greater sensitivity to detect small but significant differences

Explanation:

The p-value of a test statistic is used to express the level of significance of the test result. A significant result is typically considered as one with a small p-value of less than or equal to 0.05 at which point we reject the null hypothesis

The p-value can be made smaller by either

1) Increasing the size of the sample (N)

2) Decreasing the standard error

3) Increasing the difference between the hypothesized parameter and the statistic of the sample

The standard error, SE, is given as follows;

\(SE = \dfrac{\sigma}{\sqrt{N} }\)

Where;

σ = The standard deviation of the sample

n = The sample size

Therefore the standard error decreases, gets smaller,  with increasing sample size, N

Therefore, the small difference between the sample mean could reach statistical significance with a large sample because as N increases the standard error gets smaller reflecting less variability in sample means, which allows greater sensitivity to detect small but significant differences.

To find x such that x = -Bx, we need to first find the magnetic force acting on the electron. The formula for magnetic force (F) acting on a charged particle is:
F = q * (v × B)

where q is the charge of the electron, v is its velocity, and B is the magnetic field. The given magnetic field B = Bx * i^ + (3 * Bx) * j^, and the given velocity v = 2.0 * i^ + 4.0 * j^.

We are given that the magnetic force acting on the electron is (6.4×10^−19 N) * k^, so:
F = (6.4×10^−19 N) * k^

Now let's compute the cross product v × B:
v × B = (2.0 * i^ + 4.0 * j^) × (Bx * i^ + (3 * Bx) * j^)

When we compute this cross product, we get:
v × B = -12 * Bx * k^

Now we equate this to the magnetic force F:
-12 * Bx * k^ = (6.4×10^−19 N) * k^

Divide both sides by k^:
-12 * Bx = 6.4×10^−19 N

To solve for Bx, divide both sides by -12:
Bx = (6.4×10^−19 N) / (-12)
Bx = -5.33×10^−20 N

Now we can find x such that x = -Bx:
x = -(-5.33×10^−20 N)
x = 5.33×10^−20 N

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The closest you can be to speaker B and be at a point of perfectly destructive interference- 1.008m.

The wavelength of sound emitted by speakers

= velocity / frequency

= 344 / 172

= 2 m

For destructive interference , path difference is equal to odd multiple of  half the wavelength .

path difference = 2 / 2 = 1 m

d₂ - d₁ = 1 m

d₂ = d₁ + 1 m

d₂ = .008 m + 1

 d₂ = 1.008 m

So, the closest you can be to speaker B and be at a point of perfectly destructive interference- 1.008m.

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The complete question is:

Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. The frequency of the waves emitted by each speaker is 172 HzHz. You are 8.00 mm from speaker A. Take the speed of sound in air to be 344 m/sm/s. What is the closest you can be to speaker B and be at a point of perfectly destructive interference?

The magnitude of the total momentum of the two carts after the collision is 1 kg m/s west.

The total momentum of the two carts is calculated by applying the principle of conservation of linear momentum as shown below.

Mathematically, the formula for principle of conservation of linear momentum is given as;

Pf = Pi

where;

The magnitude of the momentum of the blue cart before the collision is 2.0 kilogramdmeters per second.

The magnitude of the momentum of the red before the collision is 3.0 kilogramdmeters per second.

The magnitude of the total momentum of the two carts after the collision is calculated as follows;

Pt = P (W) - P ( E )

Pt = 3 kg m/s - 2 kg m/s

Pt = 1 kg m/s

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Answer:

The tin fork and knife, the copper coin, and the steel fence pole.

Explanation:

Those are both what people would call soft metals so they are malleable to the extent of probably not needing heavy duty equipment. It depends on you description of malleable because the steel fence pole could be malleable with the correct equipment and not snap in half if bent slowly enough.

The definition of malleable: (of a metal or other material) able to be hammered or pressed permanently out of shape without breaking or cracking.

But the glass table, marble sculpture and antique ceramic vase are nowhere near malleable because if you tried bending them they wouldn't bend but would shatter and break into pieces.

The tin fork and knife, the copper coin, and the steel fence pole are malleable, the correct option is A, C, and F.

A malleable material is one that can be easily formed into a thin sheet by hammering. The most malleable metal is gold. In contrast, ductility is a solid material's ability to deform under tensile stress.

Metals are malleable because when a force is applied, layers of ions can slide over each other. Metallic bonding allows metal to change shape without breaking.

Gold, iron, aluminum, copper, silver, and lead are examples of malleable metals. Ductility and malleability do not always correlate; for example, gold is both ductile and malleable, whereas lead is only malleable.

Tin fork and knife, copper coin, and steel fence pole are all malleable.

Thus, the correct options are A, C, and F.

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The study of radioactivity by Marie Curie marked a significant turning point in the realm of physics and had a significant influence on scientific knowledge. Now let's get into the specifics.

"Radioactivity" is the term Marie Curie coined to describe the phenomenon whereby materials emit radiation that can fog photographic plates. During her uranium investigation in 1896, she made this discovery. This game-changing discovery opened the door for more research into and comprehension of radioactivity, which resulted in important developments in the field of nuclear physics.

Marie Curie's research on radioactivity served as a springboard for additional nuclear physics research and has profound ramifications for other fields of science and medicine. It resulted in improvements in our knowledge of atomic structure, the creation of radiation therapy for the treatment of cancer, and the eventual exploitation of nuclear energy.

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Answer:

\(Net_{F}\) = 750N - 750N = 0N

Explanation:

The forces are balanced and there is no average Net force

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Hope this helps! :)

Answer:

Kinetic Energy = 2.7J

Explanation:

Conversion :

200g = 0.2kg

Kinetic Energy = ½ × mass × (velocity)²

Kinetic Energy = ½ × 0.2kg × (5.2m/s²)

Kinetic energy = ½ × 0.2kg × 27.04m²/s²

Kinetic Energy = 2.7J

The right answer is "2.7 J"

Answer explanation:

Remember to convert grams to kilograms first by dividing by 1000.

Kinetic energy

= 1/2 × mass × speed2

= 1/2 × 0.2 kg × (5.2 m/s)^2

= 2.7 J (to 2 sig. fig.)

Hope it helps ✨✨

approximately 2.093 x 10^(-6) cubic meters (or 2.093 milliliters) of coffee has spilled out of the beaker.To calculate the volume of coffee that has spilled out of the beaker, we can use the concept of thermal expansion. The change in volume is given by the formula ΔV = βVΔT, where β is the coefficient of volume expansion, V is the initial volume, and ΔT is the change in temperature.

First, let's convert the initial volume to cubic meters: V = 0.858 x 10^(-3) m^3.
Next, we calculate the change in temperature: ΔT = 90.6 - 18.2 = 72.4 °C.
The coefficient of volume expansion for water (and coffee) is approximately β = 3.4 x 10^(-4) °C^(-1).
Plugging in these values into the formula, we get:
ΔV = (3.4 x 10^(-4) °C^(-1)) * (0.858 x 10^(-3) m^3) * (72.4 °C) = 2.093 x 10^(-6) m^3.

Therefore, approximately 2.093 x 10^(-6) cubic meters (or 2.093 milliliters) of coffee has spilled out of the beaker.

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Answer:

Here initial speed u = -30 m/sec Final

Explanation:

Answer:

1. Thermal Energy

Explanation: