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Define: Medium ​

Answer:

The potential energy of the pendulum is 0 when the pendulum is at its equilibrium position. Therefore, at this point, the mechanical energy E is equal to the kinetic energy KE (all the energy at the equilibrium position is kinetic).

Explanation:

Answer:

Instead, we see the Moon because of the Sun's light reflects back to our eyes. In fact, the Moon reflects so much of the Sun's light that it's the second brightest object in the sky after the Sun. ... These objects — other planets and stars — can usually only be seen at night when the Sun's light doesn't outshine them.

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The magnitude of the tension in each radial strand is approximately 4.91×\(10^{-3}\) N.

To find the magnitude of the tension, t, we can use the equation:

t = (m * \(v^2\)) / r. Where m is the mass of the spider, v is its velocity, and r is the radius of the circular path it is moving along. However, since we are given that the spider is stationary and hanging from radial strands, we can use a simpler formula:

t = m * g

Where g is the acceleration due to gravity, which is approximately 9.81 \(m/s^2\) on Earth.

Substituting the given mass of the spider, we get:

t = (5.0×\(10^{-4\) kg) * 9.81 \(m/s^2\)

t = 4.91×\(10^{-3}\) N

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Answer:

10.61 m/s

Explanation:

To find the final speed, we will use the conservation of momentum in each direction, so we can write the following equations:

Where m1 and m2 are the mass of the vehicles, v1 and v2 are their respective velocities in each direction, and Vfx and Vfy are the final velocities in each direction.

If one of the vehicles is headed north, its horizontal velocity Vx = 0 m/s. In the same way if the other is headed east, its vertical velocity Vy = 0m/s

Therefore, we can replace the values and solve the first equation as:

In the same way, we can solve the second equation as:

Now, we know that the vertical and horizontal speed was 7.5 m/s. So, we can calculate the final speed using the Pythagorean theorem as:

So, the speed after the collision was 10.61 m/s

The correct answer is B.Antartica and Australia were one landmass millions of years ago.

Answer:

light travels slowest in diamond

Explanation:

The higher the index of refraction is, the slower the speed of light is. The indexes of refraction for diamond, air, and glass are, respectively, 2.42, 1.00, and approximately 1.50, depending upon the composition of the glass. Light travels slowest in diamonds.

Answer:

Frequency – The frequency of a wave is the number of waves that pass a given point in a certain amount of time. Frequency is measured in units called hertz (Hz), and is defined as the number of waves per second. A wave that occurs every second has a frequency of 1 wave per second (1/s) or 1 Hz.

Answer:

B. An attractive force between two objects due to their mass

Explanation:

Answer:

B

Explanation:

Gravity is a force that pulls 2 objects towards each other and varies depending on mass. The earth for example is large enough to have a gravitational force that keeps us down. The sun has a gravitational force that keeps the Earth in orbit.

Heat is a form of energy.

When heat is provided to any object, the molecules, and atoms of the object gain heat energy.

This energy results in an increase of kinetic energy of the molecules, which vibrate faster with more speed.

If more amount of heat is provided to the object, this results in the breaking of intermolecular forces, and the object changes its state(from solid to liquid).

Thus, objects when heated up gain energy which increases the internal energy of the object.

The electric field between the plates is 50,000 N/C.

It is provided that the separation d between the plates is 4.4 mm and the potential difference V between the plates is 220 V.

The electric field E between the plates can be formulated as follows.

E=\(\frac{V}{d}\)

substituting the values in the equation,

E= \(\frac{220}{0.0044}\)

E= 50,000 N/C

Hence, we can say that the electric field between the plates is 45833.33 N/C.

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Answer:

Frequency and tfcvvbyfgffhhi

Answer:

I think frequency

Explanation:

The final velocity of the object after the force acts for 0.2 seconds is 20 m/s.  

To solve this problem, we can use the equation of motion, which is:

v(t) = v + at

here:

v(t) is the final velocity

v0 is the initial velocity

a is the acceleration

t is the time

Using this equation, we can find the final velocity after the force acts for 0.2 seconds.

First, we need to find the time t for which the force acts:

t = 0.2 seconds = 20 seconds / 60 seconds per second = 0.333 seconds

Next, we can plug in the values and solve for v(0.333):

v(0.333) = 20 + 0 * 0.333 = 20 m/s

Therefore, the final velocity of the object after the force acts for 0.2 seconds is 20 m/s.  

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Answer:

No. The size of the particles in the substance remains the same when the state of matter changes.

Explanation:

this is the exact answer.

The position of Earth, Moon and Sun in New moon is option (B)  With the Moon between Earth and the Sun.

During a New Moon, the Moon is located between the Earth and the Sun, with the illuminated side facing away from Earth. This alignment causes the Moon to appear mostly invisible from Earth, marking the beginning of a new lunar cycle.

To represent a New Moon in a model, Kevin should position the Moon between Earth and the Sun. This positioning accurately reflects the alignment of the three celestial bodies during a New Moon phase, and it helps demonstrate the relationship between their positions and the resulting phases of the Moon as observed from Earth.

Therefore, the correct option is (B) With the Moon between Earth and the Sun.

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David traveled a total distance of 630 km.

distance = speed × time

Let's first calculate the distance he traveled during the first 6 hours at a speed of 65 km/hour:

distance1 = speed1 × time1

distance1 = 65 km/hour × 6 hours

distance1 = 390 km

Now, let's calculate the distance he traveled during the last 3 hours at a speed of 80 km/hour:

distance2 = speed2 × time2

distance2 = 80 km/hour × 3 hours

distance2 = 240 km

To find the total distance of the journey, we can add the two distances:

total distance = distance1 + distance2

total distance = 390 km + 240 km = 630km.

Distance is a measurement of the amount of space between two points or objects. It is a fundamental concept in mathematics and physics that is used to describe the extent of separation between two or more entities in a three-dimensional space. Distance can be expressed in a variety of units, including meters, kilometers, miles, feet, and inches, among others.

In physics, distance is an essential parameter for describing the movement of objects. It is used to calculate speed, velocity, and acceleration, which are all fundamental concepts in physics. In addition, distance is also used in the field of astronomy to describe the vast distances between celestial objects such as stars, planets, and galaxies.

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The intrinsic brightness of a star can vary greatly from star to star, depending on factors such as its size, temperature, and age. These variations in intrinsic brightness are used to classify stars into different types or spectral classes, such as supergiants and dwarfs.

Based on what you know about the intrinsic brightness of stars, select all of the correct statements from the following list:
1. The intrinsic brightness of a star is also known as its absolute magnitude. This magnitude measures the actual amount of light that a star emits.
2. The intrinsic brightness of a star is independent of its distance from Earth. This means that even if a star is far away, its intrinsic brightness remains the same.
3. The intrinsic brightness of a star can be determined by measuring its apparent magnitude and knowing its distance from Earth. The apparent magnitude is how bright a star appears to us from Earth, while the distance is the actual physical distance between the star and Earth.
4. The intrinsic brightness of a star can be used to classify stars into different types or spectral classes. For example, stars with high intrinsic brightness are classified as "supergiants," while stars with low intrinsic brightness are classified as "dwarfs."
5. The intrinsic brightness of a star can vary greatly from star to star. Some stars are much brighter than others due to factors like their size, temperature, and age.
6. The intrinsic brightness of a star can be calculated using the formula: Intrinsic Brightness = (Apparent Brightness * 4π * (Distance)²) / (Luminosity Constant)
The intrinsic brightness of a star, also known as its absolute magnitude, is a measure of the actual amount of light that a star emits. It is important to note that the intrinsic brightness of a star is independent of its distance from Earth. This means that even if a star is far away, its intrinsic brightness remains the same.

However, in order to determine the intrinsic brightness of a star, we need to measure its apparent magnitude (how bright it appears to us from Earth) and know its distance from Earth. The apparent magnitude is measured on a logarithmic scale, with smaller numbers indicating brighter stars. By comparing the apparent magnitude and distance of a star, we can calculate its intrinsic brightness using the formula: Intrinsic Brightness = (Apparent Brightness * 4π * (Distance)²) / (Luminosity Constant).

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Answer:a

Explanation:

The length of your spaceship is getting shorter.

This phenomenon occurs due to a concept called length contraction, which is a result of special relativity. As the speed of the spaceship approaches the speed of light, an observer inside the spaceship would perceive its length to be shorter.

This occurs because the relative motion between the spaceship and the observer affects the way distances are measured.

However, it is important to note that this effect is only noticeable at speeds close to the speed of light.

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The classification of stars based on their spectral type follows the sequence O, B, A, F, G, K, and M, with O-type stars being the hottest and M-type stars being the coolest. The habitable zone, also known as the "Goldilocks zone," refers to the region around a star where conditions may be suitable for the existence of liquid water on the surface of a planet.

G-type stars, such as our Sun (classified as G2V), are considered to be within the optimal range for habitability. These stars have a stable and long-lasting main sequence phase, providing a relatively steady energy output over billions of years. Planets orbiting within the habitable zone of a G-type star have the potential to maintain a stable climate, with the right conditions for liquid water to exist. While other star types like F-type, K-type, and even some M-type stars can have habitable zones, G-type stars are generally considered to provide more favourable conditions for life.

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The 1 repetition maximum (1 RM) refers to the maximum amount of resistance you can move one time. Option C is correct.

The 1 repetition maximum (1 RM) is a measure of the maximum amount of resistance an individual can lift in a single repetition of a given exercise. It is commonly used in strength training to determine an individual's level of strength and to develop an appropriate training program.

The 1 RM is typically determined by gradually increasing the resistance until the individual can no longer lift the weight with proper form. This maximum amount of resistance lifted is then recorded as the 1 RM. By using the 1 RM as a benchmark, individuals can track their progress over time and adjust their training program accordingly to continue making gains in strength. Hence, option C is correct.

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(a) The work function  is 1.98 x 10⁻¹⁹ J.

(b) The threshold frequency is 3 x 10¹⁴ Hz.

(c) The maximum kinetic energy of the most energetic electron is 3.32 x 10⁻¹⁹ J.

(d) Photo-electron would be ejected.

(e) The only constant parameter would be speed of the photon.

(f) The slope of the graph is 6.67 x 10⁻³⁴ J.s

(a) The work function of the experimental photo-missive material is calculated as follows;

Ф = hf₀

where;

Ф = hf₀

Ф = 6.626 x 10⁻³⁴ x 3 x 10¹⁴

Ф = 1.98 x 10⁻¹⁹ J

(b) The threshold frequency of the experimental photo-missive material is the frequency at which the kinetic energy is zero = 3 x 10¹⁴ Hz.

(c) The maximum kinetic energy of the most energetic electron is calculated as;

K.E = E - Φ

K.E = ( 6.626 x 10⁻³⁴ x 8 x 10¹⁴) -  1.98 x 10⁻¹⁹ J

K.E =  3.32 x 10⁻¹⁹ J

(d) The frequency of the photon with a wavelength of 500 nm is calculated as;

f = c/λ

where;

f = ( 3 x 10⁸ ) / ( 500 x 10⁻⁹ )

f = 6 x 10¹⁴

Since the frequency of the incoming photon is greater than  the threshold frequency, photo-electron would be ejected.

(e) If you use a different experimental photo-missive material the only parameter that would be the same on the graph is speed of photon.

(f) The slope of the graph is calculated as;

m = (2.5 eV - 0 eV) / [(9 - 3) x 10¹⁴]

m = (2.5 ev) / (6 x 10¹⁴)

m = (2.5 x 1.6 x 10⁻¹⁹ ) / (6 x 10¹⁴ )

m = 6.67 x 10⁻³⁴ J.s

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There are two forces acting on the proton, the electrostatic force and the weight; we also know that the forces are balanced which means that they have to be equal, then we have:

Now, we know that the electrostatic force is related to the electric field by:

and that the weight is given by:

Plugging these in the first equation we have:

The mass and charge of the proton are:

plugging the values in the expression for the field we have:

Therefore, the magnitude of the field is:

Since a proton has a positive charge it will move in the direction of the field; in this case we need the force to be pointing up since the weight points down.

Therefore, the direction of the field is up.

Scientists classify everything in the universe as either matter or energy.

Matter refers to anything that has mass and takes up space, such as atoms, molecules, and objects made up of these particles. Energy, on the other hand, refers to the ability to do work or to cause changes in matter. Energy can take various forms, including kinetic energy, potential energy, thermal energy, electromagnetic radiation, and many others.

The distinction between matter and energy is a fundamental concept in physics and has important implications for our understanding of the physical world and the behavior of various systems, from subatomic particles to the entire universe.

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The complete question is :

Fill in the blanks:

Scientists classify everything in the universe as either______

Answer:

[sə′plī ‚vōl·tij] (electricity) The voltage obtained from a power source for operation of a circuit or device.

Explanation:

hope this helps :)

The surface pressure is higher or lower than the SLP (Sea Level Pressure) of your location depending on the altitude at which it was measured. At Falcon Field, the surface pressure was measured at 245 meters above sea level.

This means that the pressure is lower than the SLP because the higher the altitude, the lower the atmospheric pressure. The atmospheric pressure decreases with an increase in altitude due to the decrease in the air density at higher elevations.

Surface pressure, also known as atmospheric pressure, is the pressure that the air exerts on the surface of the Earth.

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Answer:

Rayleigh's criterion for resolution is

θ = 1.22 * λ / D

If we choose green light (near the middle of the spectrum)

λ = 5000 * 1.0E-10 = 5.0E-7 m

Since D = .043 m        aperature available for resolution

θ = 1.22 * λ / D = 1.22 * 5.0E-7 / .043 = 1.4E-5

D = S * θ         where θ is angle subtended by D

S = D / θ  = .0009 m / 1.4E-5 = 64 m

S = 64 m

Wanda can reply to her friend by saying that she is using a telephoto lens for their photography outing.

A telephoto lens is a type of camera lens that is designed to capture distant subjects by using a longer focal length than a standard lens. Telephoto lenses typically have a focal length of 60mm or longer, which allows them to see and record a very narrow view. This makes them ideal for capturing subjects that are far away, such as wildlife, sports events, and landscapes. Telephoto lenses are also popular for portrait photography because they can create a shallow depth of field, which helps to isolate the subject from the background.

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Answer:

tension

Explanation:

its a feeling

Answer:

pectoral muscles

Explanation: