The expanding Universe theory Choose one: A. raises the question of when the expansion began. B. is supported by the fact that all galaxies exhibit a blueshift. C. was developed before the Big Bang theory. D. contends that galaxies are moving away from the Earth and from each other at a very low velocity.

A transverse wave is a type of wave where the disturbance or vibration is perpendicular to the direction of the wave's travel. An example of a transverse wave is a wave on a string or rope, where the wave moves up and down perpendicular to the direction of the wave's travel.

A longitudinal wave is a type of wave where the disturbance or vibration is parallel to the direction of the wave's travel. An example of a longitudinal wave is a sound wave, where the particles in the air vibrate back and forth parallel to the direction of the wave's travel.
An electromagnetic wave is a type of wave that consists of electric and magnetic fields that oscillate perpendicular to each other and to the direction of the wave's travel. Examples of electromagnetic waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.

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Conventional method of heat transfer.​

How it works?

For example:

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The boiling point of 0.600 m lactose in water is 100.307 °C.

The boiling point elevation of a solution can be calculated using the following equation: ΔTb = Kb * m

where ΔTb is the boiling point elevation, Kb is the boiling point elevation constant (0.512 °C/m for water), and m is the molality of the solution.

To calculate the molality of the lactose solution, we need to know the molar mass of lactose, which is 342.3 g/mol. Using the given concentration of 0.600 m, we can calculate the mass of lactose in 1 kg of water:

0.600 mol lactose / 1 L solution x 342.3 g lactose / 1 mol lactose = 205.4 g lactose / 1 L solution

Thus, the molality of the lactose solution is:

m = moles of solute / kg of solvent

= 0.600 mol lactose / (1000 g water - 205.4 g lactose)

= 0.000631 mol/g water

Now we can use the boiling point elevation equation to find the change in boiling point:

ΔTb = Kb * m

= 0.512 °C/m * 0.000631 mol/g water

= 0.000324 °C

Therefore, the boiling point of the lactose solution is: Boiling point = 100 °C + ΔTb = 100.307 °C

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Answer: Stars are formed in dust clouds and are found in most galaxies.

Explanation:

Answer: Stars form inside relatively dense concentrations of interstellar gas and dust known as molecular clouds.

Explanation:

Answer:

Projectile motion

Explanation:

On which planet would a 15.0 kg object weigh the most?The weight of an object is affected by its mass and the strength of gravity. On planets with a greater mass, the force of gravity is stronger than on those with a lower mass. Hence, the weight of an object is greater on planets with more mass, according to Newton's second law of motion.

The weight of a 15 kg object is the largest on the planet Jupiter because Jupiter has the highest mass among all the planets of our solar system. The answer is written below:Jupiter is the planet where a 15.0 kg object would weigh the most.Round the answer to the nearest whole numberOn Jupiter, the acceleration due to gravity is 24.79 m/s². The weight of an object on Jupiter is calculated using the formula:

F = m × gwhereF is the force of gravity (in newtons),m is the mass of the object (in kilograms), andg is the acceleration due to gravity (in meters per second squared).On Jupiter, the weight of a 15.0 kg object is:F = 15.0 kg × 24.79 m/s²= 371.85 N = 372 N (to the nearest whole number)Therefore, on Jupiter, a 15.0 kg object would weigh about 372 N.

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Answer:

While self-gravity pulls the star inward and tries to make it collapse, thermal pressure (heat created by fusion) pushes outward. These two forces cancel each other out in a main sequence star, thus making it stable.

Explanation:

Answer:

59g

Explanation:

The tennis ball with a velocity of 18 m/s and momentum of 1.06 kg m/s then the mass of the tennis ball in grams will be 59 grams (approx) two significant figures.

Regardless of the frame of reference, momentum is a conserved quantity in any inertial frame, which means that if an enclosed system is not subject to outside influences, its total linear momentum remains constant.

Additionally, momentum is preserved in general relativity, electrodynamics, quantum mechanics, quantum field theory, and special relativity (using a modified formula). It is a manifestation of translational symmetry, one of the basic symmetries of space and time.

According to the question, the given values are :

Velocity, v = 18 m/s

Momentum, p = 1.06 kg m/s

p = m × v

1.06 kg m/s = m × 18 m/s

m = 1.06 / 18

m = 0.0589 kg or

m = 58.9 grams or 59 grams approx in two significant figures.

So, the mass will be 59 grams.

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Answer:

a jacket closing mechanism a most useful tool to preserve and protect.

Explanation:

Answer:

zip·per

/ˈzipər/

noun

a device consisting of two flexible strips of metal or plastic with interlocking projections closed or opened by pulling a slide along them, used to fasten garments, bags, and other items.

The net force on the box is 40N.

The net force acting on an object is the result of all pushing and pulling forces acting on the object collectively (the sum). If there is an imbalance in the pushing and pulling forces acting on an object, the object will accelerate in the direction of the net force.

According to Newton's second law, an object's acceleration is inversely proportional to its mass and proportional to both the resultant force and the resultant force.

Force = m × a

40 = 10 × a

a = 40/10

a = 4m/s²

Net force ∑F = m×a

∑F = 10 × 4

∑F = 40N.

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Answer:

F = 1250000 N

Explanation:

If you have 50,000 S, by 25 M. It would be calculated to 1,250,000 N.

Answer: Answer down below.

Explanation:

Answer: They both give us a notion about the position of an object

Explanation:

I need you to make me an invented poem written please not in image

Answer:

yes

Explanation:

good job

Answer:

a) R = 172.82 m, 5.3 north of east    b)   v = (0.24 ± 0.01) m / s

Explanation:

a) the displacement is a vector, so the easiest method to lock is looking for each component

let's start decomposing the vectors

 x₁ = - 160 m

second shift

angle 45 south of east

     cos (-45) = x₂ / d₂

     sin (-45) = y₂ / d₂

     x₂ = d₂ cos 45

     y₂ = -d₂ sin 45

     x₂ = 180 cos 45 = 127.28 m

     y₂ = -180 sin 45 = - 127.28 m

third shift

      cos 35 = x₃ / d₃

      sin 35 = y₃ / d₃

      x₃ = d₃ cos 35

      y₃ = d₃ sin 35

      x₃ = 250 cos 35 = 204.79 m

      y₃ = 250 sin 35 = 143.39 m ₃

X axis

       x_total = x₁ + x₂ + x₃

       x_total = -160 +127.28 +204.79

       x_total = 172.07 m

Y axis  

      y_total = y₁ + y₂ + y₃

      y_total = 0 - 127.28 + 143.39

      y_total = 16.11 m

to compose the displacement we use the Pythagorean theorem

      R = \(\sqrt{x^2 +y^2}\)

      R = \(\sqrt{172.07^2 + 16.11^2 }\)

      R = 172.82 m

in angle is

      tan θ = y_total / x_total

      ten θ = 16.11 / 172.07 = 0.0936

      θ = tan⁻¹ 0.0936

       θ = 5.3

angle is 5.3 north of east

b) the error in the distance is 5%,

               e% = ΔR/R  100

               ΔR = e% R / 100

               ΔR = 5 172.82 / 100

               ΔR = 8.6 m

the time error Dt = 20 s

We calculate the speed and this we calculate the error

      v = R / t

      v = 172.82 / 12 60

      v = 0.240027 m / s

the error in this magnitude is

      Δv = \(\frac{dv}{dR} \ \Delta R + \frac{dv}{dt} \ \Delta t\)

       Δv = \(\frac{1}{t} \ \Delta R + \frac{R}{t^2 } \ \Delta t\)

         Δv = \(\frac{ 8.6}{720} + \frac{172.82 \ 20}{720^2 }\)

         Δv = 0.013 m / s

the measurement result is

         v = (0.24 ± 0.01) m / s

Answer:

The correct options are;

a. ii. Savery engine The boiler could not withstand the steam pressure needed to lift water beyond 6 m.

b. i.Gunpowder engine The engine had no mechanism to move the piston back to complete a cycle

c. iii. Newcomen engine The continual reheating needed after each cooling of the engine cylinder required tremendous amount of thermal energy

d. iv. Watt engine This engine was large and massive and less efficient than thought possible

Explanation:

a. The evaporation of the water due to the effect of creating a vacuum limits the Savery's engine pressure differential to about 20 (which is approximately 6 meters) to 25 feet of suction

b. In The gunpowder engine after providing power to a mass, there is less provision to move the piston to a position to lift another mass

c. Energy from burning of fuel was needed to heat the steam cylinder (the steam and the steel wall) repeatedly which consumed a considerable energy in the Newcomen engine

d. In the Watt steam engine the increased efficiency attainable was 17.4% while the actual efficiency was about 11% with the addition of a separate condenser unit.

F = 20 N

m = 250 g = 0.25 Kg

a = ?

Using Newton's 2nd Law

a = F/m

a = 20/0.25

a = 80 m/s²

The acceleration of an object with a mass of 250 grams or 0.250 kg and force applied of 20N is 80m/s².

Acceleration is the rate of change of velocity of an object. Acceleration means the speed of the object is changing, but not always. When an object moves in a circular path at a constant speed rather than variable, it is still accelerating, because the direction of its velocity is changing. It is a vector quantity as it has both the magnitude and direction. The SI unit of acceleration is meter per second (m/s²).

According to the formula,

f = m × a

f = force,

m = mass of the body,

a = acceleration of the body

f = 20N

m = 250 grams = 0.250kg (1kg = 1000grams)

f = m × a

a = f/ m

a = 20N/ 0.250kg

a = 80m/s²

The acceleration of the body is 80m/s².

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The period of this pendulum on the surface of Jupiter is 3.68 sec.

An object is drawn toward the earth's core by the force of gravity. The acceleration brought on by gravity is 9.8 m/s2 on earth. The formula used to determine the acceleration brought on by gravity is g = GM/r2.

Using Newton's equations, we may determine the gravitational pull between two objects. F = G (M x m) / r squared, where M is the mass of one item, m is the mass of the other object, and r is the separation between the centers of the two masses, is the formula for Newton's law of gravitation.

Given:

Period of the pendulum on the Earth = T_e = 1.70 s

Gravitational Acceleration of the Earth = g_e = 9.8 m/s²

Gravitational Acceleration of the Mars = g_m = 3.71 m/s²

\(T_m=\sqrt{\frac{g_e}{g_m} } *T_e\)

\(T_m=\sqrt{\frac{9.81}{26} } *6\)

\(T_m=\sqrt{0.377} *6\)

\(T_m=3.68s\)

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Answer:

A

Explanation:

Amplitude = height of the wave = 1

Wavelength = 3

They are slightly shifted.

The first statement is the correct one.  Don't make me type the whole thing out.

To calculate the wavelength of a radio station's frequency, we can use the formula:

Wavelength = Speed of Light / Frequency

The speed of light is approximately 3 x 10^8 meters per second.

Given that the frequency of WYEP radio station is 9.13 x 10^7 hertz (91.3 megahertz), we can plug in the values:

Wavelength = (3 x 10^8 m/s) / (9.13 x 10^7 Hz)

Dividing the values, we get:

Wavelength = 3.28 meters

Therefore, the wavelength of WYEP radio station's frequency is approximately 3.28 meters.\(\)\(\huge{\mathcal{\colorbox{black}{\textcolor{lime}{\textsf{I hope this helps !}}}}}\)

♥️ \(\large{\textcolor{red}{\underline{\texttt{SUMIT ROY (:}}}}\)

The magnitude of the magnetic field in the coil is 21.65 T.

The given parameters;

The induced emf in the coil is determined by applying Faradays law;

\(emf =N \frac{d\phi }{dt} \\\\emf = N ( \frac{\phi _2 - \phi_1}{t} )\\\\emf= N(\frac{BAsin\ 60 - BAsin\ 90}{t} )\\\\emf = NBA(\frac{sin60 - sn90}{t} )\\\\-0.058 = 500(6\times 10^{-4})\times B\times (\frac{0.866 - 1}{15} )\\\\-0.058 = -0.00268B\\\\B = \frac{0.058}{0.00268} \\\\B = 21.65 \ T\)

Thus, the magnitude of the magnetic field in the coil is 21.65 T.

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The equation KE = GPE can be expressed as ½mv² = mgs, where m is the mass of the object, v is its final velocity, g is the gravitational field strength, and h is the height from which it was dropped.

The Since the hammer and the feather were dropped from the same height, we can equate their gravitational potential energies and kinetic energies. For the hammer, ½mhammer v² = hammer g h for the feather, ½mfeather v² = feather g Since both objects experience the same gravitational field strength, we can simplify the equation to ½v² = g h. Rearranging, we get v² = 2gh, which is the relationship between the final velocity of a falling object, the gravitational field strength, and the height from which it was dropped. This equation shows that the mass of an object does not affect the speed at which it drops, as long as it is dropped from the same height and experiences the same gravitational field strength. The hammer and the feather fall at the same rate on the moon because they have the same acceleration due to gravity, regardless of their mass.

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Using a saltwater aquarium to model the ocean has limitations, such as showing only a small part of the actual ocean and being unable to replicate the vastness and complexity of the ocean ecosystem.

One limitation of using a saltwater aquarium to model the ocean is that it can only show a small part of the actual ocean. Since an aquarium is confined and limited in size, it cannot realistically replicate the vastness and complexity of the ocean ecosystem. For example, it may not have the space to accommodate large marine animals like whales or the turbulent currents that exist in the open ocean. Therefore, it is important to recognize that while a saltwater aquarium can provide some insights into the ocean, it cannot fully capture the dynamic nature and diverse interactions found within the entire ocean ecosystem.

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The average DC voltage would be approximately 0.9 times the RMS value of the original AC waveform, which is 108VDC.

A full-wave rectifier converts an AC waveform into a unidirectional waveform, typically using diodes. In the case of a full-wave rectifier, both the positive and negative half cycles of the AC waveform are rectified. This means that the negative half cycles are flipped to become positive.

When the AC sine wave with an RMS value of 120VAC is rectified, the resulting waveform consists of positive half cycles only. The peak voltage of this rectified waveform is equal to the RMS value of the original AC waveform, which is 120VAC.

The rectified waveform is then passed through a smoothing filter, usually a capacitor, to reduce the ripple. The capacitor charges up during the positive half cycle of the rectified waveform and discharges slowly during the gaps between the half cycles, providing a more constant output voltage.

The output voltage of the smoothing filter is approximately equal to 0.9 times the peak voltage of the rectified waveform. This is due to the voltage drop across the diodes and the charging and discharging behavior of the capacitor.

Therefore, in this scenario, the average DC voltage would be approximately 0.9 times the RMS value of the original AC waveform, which is 0.9 * 120VAC = 108VDC.

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Answer:

The elevator moves up with an acceleration of  3.5 m/s²

Explanation:

Given:

m = 15 kg   (not 150!! :))

Tmax = 200 N

g = 9.8 m/s²

____________

a - ?

The elevator moves up with an acceleration a:

Tmax =  m·(g + a)

g + a = Tmax / m

a = Tmax / m  -  g

a = 200 / 15 - 9.8 ≈   3.5 m/s²

ANSWER

625 m/s

EXPLANATION

Given:

• The frequency of the sound wave, f = 250 Hz

• The wavelength, λ = 2.5 m

Find:

• The speed of the wave, v

The speed of a wave of wavelength λ and frequency f is given by,

Substitute the known values and solve,

Hence, the speed of the wave is 625 m/s.

The transducer took 0.077 seconds to detect the reflected waves from the metal fragment.

To calculate the time taken by the transducer to detect the reflected waves, we can use the formula: time = distance/speed. Here, the distance is twice the depth of the metal fragment in the muscle tissue, which is 10 cm or 0.1 m.

The speed of sound waves in muscle tissue is 1,300 m/s. So, time = 0.1/1300 = 0.000077 s or 0.077 ms.

This means it took the transducer 0.077 seconds to detect the reflected waves from the metal fragment after they were first emitted. This time delay is used by the ultrasound machine to determine the depth and location of structures within the body.

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Answer:

1 : 2 (30 : 60)

Explanation:

The rate of increase of the Earth's gravity field at latitudes 30° and 60° are in the ratio 1 : 2 because 30 : 60 simplified is 1 : 2.

If the answer does not ask for the ratio to be simplified leave its as 30 : 60.

On Earth, you would need to look straight overhead from wherever you are standing in order to see the Earth

Where does the Sun's peak occur on Earth?

People who reside at lower lattitudes (within 23.5 degrees of the equator) occasionally have the opportunity to see the sun rise at the zenith, an imaginary point directly overhead.

The point on the celestial sphere that is immediately above a watcher on Earth is called the zenith. The nadir is the spot directly beneath you that is 180 degrees opposite the zenith. Gravity, or by looking up a plumb line, determines the astronomical zenith. You would need to be at 35 degrees north latitude, or 35 degrees north of the equator, to see the celestial equator cross through your horizon.

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