how did the ancient greeks attempt to explain the motion of the planets?

Answer:

Explanation:

Set the equations for work and kinetic energy equal to each other. Work equals force times distance and kinetic energy equals one-half the mass of the object times its velocity squared, so F_d = (m_ ÷ _2)_v2. Substitute the measurements for force, distance and mass into the equation.

The energy an object has as a result of motion is known as kinetic energy.

A force must be applied to an object in order to accelerate it. We must put in effort in order to apply a force.

After the work is finished, energy is transferred to the item, which then moves at a new, constant speed. Kinetic energy is the type of energy that is transferred and is dependent on the mass and speed attained.

The square of the object's velocity determines the kinetic energy. In other words, when an object's velocity twice, its kinetic energy quadruples.

Therefore, The energy an object has as a result of motion is known as kinetic energy.

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Answer:

Yes, The object can have zero displacement.

Explanation:

The object moves from a certain point A and reaches point B, a distance of 10 km. Then the object moves from point B and reaches point A, a distance of 10 km.

The object has covered 10 km + 10 km is equal to 20 km but the object after covering certain distance has reached the starting point. So the displacement of the object is zero.

-TheUnknownScientist 72

Answer:

The main application for fusion is in making electricity. Most fusion reactors make less radiation than the natural background radiation we live with in our daily lives. ... Clean - No combustion occurs in nuclear power (fission or fusion), so there is no air pollution.

Answer:

camels have humps to store fat which is then converted to energy when food is scarce ( the humps are not used for storing water )

Answer: camels have humps to store fat which is then converted to energy when food is scarce ( the humps are not used for storing water )

The depth from the opening of the well to the water level is approximately 44.1 meters.

To find the depth from the opening of a well to the water level given a time of 3 seconds between dropping a stone and hearing its impact, we can use the equation for free fall motion. The equation relates the distance fallen (depth) to the acceleration due to gravity and the time interval.

The equation for free fall motion is:

d = (1/2) × g×\(t^2\)

where:

d is the depth of the well,

g is the acceleration due to gravity (approximately 9.8 m\(/s^2\) on Earth),

t is the time interval (3 seconds in this case).

Substituting the values into the equation, we have:

d = (1/2) × 9.8 m/\(s^2\) × (3 s)^2

= (1/2)×9.8 m/\(s^2\) × 9 s^2

= 44.1 m

Therefore, the depth from the opening of the well to the water level is approximately 44.1 meters.

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Explanation:

i dont know

The equivalent resistance of resistors combined in parallel is the inverse of the sum of the reciprocals of the individual resistances.

This means that as the number of resistors in parallel increases, the equivalent resistance decreases. In parallel, each resistor has the same voltage across it, but the current is divided among the resistors based on their individual values.

Resistors are electronic components that are used to control the flow of electric current in a circuit. They come in different values and are used to limit or adjust the flow of current. By using resistors, we can protect components in a circuit from excessive current or voltage, and also adjust the output of a circuit to our desired value.
 The equivalent resistance of resistors combined in parallel is the reciprocal of the sum of the reciprocals of the individual resistances. To calculate this, you can follow these steps:

1. Find the reciprocal of each individual resistance (1/resistance).
2. Add the reciprocals obtained in step 1.
3. Take the reciprocal of the sum obtained in step 2.

This will give you the equivalent resistance of the resistors combined in parallel. Remember that combining resistors in parallel usually results in a lower overall resistance compared to the individual resistances.

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Based on the given information, the most appropriate classification for the state of the volcano would be "Active-Dormant."

The volcano's history of generating multiple lava flows over the past 10,000 years indicates that it has been active in the relatively recent past. The presence of lava flows that have spread over large areas suggests ongoing volcanic activity, although not necessarily in the immediate present.

Additionally, the mention of very little tephra (volcanic ash and fragments) indicates that the volcano is not currently experiencing explosive eruptions. Instead, it has been primarily characterized by effusive eruptions that produce lava flows.

The fact that people in the nearby town remember the last eruption, which caused some forest fires, further supports the classification of the volcano as active-dormant. While the volcano may not be actively erupting at the moment, the memory of the recent eruption and the potential for future volcanic activity suggests that it is still in a state of activity, albeit in a relatively dormant phase.

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Answer:

a =  v^2 / R =  ω^2 R        centripetal acceleration

.4 g = .4 * 9.80 m/s^2 = 3.92 m/s^2

R = a / ω^2 = 3.92 / .66^2 =  9.0 m

D = 2 R = 2 * 9.0 = 18.0 m      diameter

Body works like a computer whenever there is any problem it warns you and those warnings are termed as symptoms. Of the body doesn't show symptoms we won't be able to detect the problem in our body.

from the perspective of the passengers on the spacecraft, the trip to Alpha Centauri takes approximately 13.782 years.

To calculate the time it takes for the trip to Alpha Centauri from the perspective of the passengers on the spacecraft traveling at a speed of 0.95c (where c is the speed of light), we can use the concept of time dilation in special relativity.

According to special relativity, time dilation occurs when an object is moving at a significant fraction of the speed of light relative to an observer. Time dilation states that as an object's velocity approaches the speed of light, time appears to slow down for that object as observed by a stationary observer.

The formula for time dilation is:

t' = t / √(1 - (v^2 / c^2))

Where:

t' is the time experienced by the moving object (passengers on the spacecraft)

t is the time measured by a stationary observer (the time on Earth)

v is the velocity of the object relative to the observer (0.95c in this case)

c is the speed of light

Given:

Distance to Alpha Centauri (d) = 4.3 light-years

Speed of the spacecraft relative to Earth (v) = 0.95c

First, we need to calculate the time experienced by the passengers (t') on the spacecraft using the time dilation formula:

t' = t / √(1 - (v^2 / c^2))

Since the speed of light is approximately 3.00 × 10^8 m/s, we can substitute the values:

t' = 4.3 years / √(1 - (0.95c)^2 / c^2)

t' = 4.3 years / √(1 - 0.9025)

t' = 4.3 years / √(0.0975)

t' = 4.3 years / 0.312

t' ≈ 13.782 years

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Answer: Justin will have higher level of hemoglobin.

Explanation: athletes have an increased total mass of red blood cells and hemoglobin in circulation.

Answer:

Justin will have higher level of hemoglobin.

Explanation:

Answer:

Explanation:

m = 4.0 kg

v = 2.0 m/s

g = 10 m/s²

Mechanical energy of the pendulum = 68.0 J

Mechanical energy of the pendulum  = Potential energy of the pendulum  + Kinetic energy of the pendulum

mgh + 1/2 mv² = 68

4 × 10 × h + 1/2 × 4 × 2 × 2 = 68

40 h + 8 = 68

40 h = 68-8

40 h = 60

h = 60 / 40

h = 3/2 m

h = 1.5 m

Answer:

Accuracy

Explanation:

Accuracy means making measurements that are close to the value precision means making measurement that are close in value to eachother but not necessarily close to the true value.

I hope this helps! If not sorry.

Answer:

the acceleration of the elevator is increasing

Explanation:

For this exercise we propose the solution using Newton's second law

         F -W = m a

         F = m (g + a)

If the net force increases, it implies that the acceleration of the elevator is increasing, since the acceleration of gravity is constant as the ascent is accelerating.

Given,

The mass of the box, m=35.0 kg

The height to which the box was lifted, h=1.75 m

Potential energy is the energy possessed by an object due to its position.

The gravitational potential energy gained by the box is,

Where g is the acceleration due to gravity.

On substituting the known values,

Thus the gravitational potential energy gained by the box is 600.25 J

1.  a) no charge

2. a) a transverse wave

3. d) all of the above.

4. a) greater than that of radio waves.

5. b) lower than that of radio waves.

6. d) all of the above.

7. d) all of the above.

8. d) all of the above

9. a) exist for all particles

10. a) modifies classical results

11.  b) the returnee is younger

12. d) all of the above statements are correct.

1. An electromagnetic wave consists of oscillating electric and magnetic fields that propagate through space. It does not carry any net charge.

2. Electromagnetic waves are transverse waves, meaning that the direction of the electric and magnetic fields is perpendicular to the direction of wave propagation.

3. Light exhibits both wave-like and particle-like behavior, as described by the wave-particle duality principle in quantum mechanics.

4. Gamma rays have a higher frequency than radio waves, which means they have more oscillations per unit of time.

5. Gamma rays have a shorter wavelength than radio waves, indicating that the distance between successive wave crests is smaller.

6. When a tree is located 20 meters from a convex lens with a focal length of 10 cm, the image formed is inverted (upside down), diminished (smaller in size compared to the object), and real (can be projected on a screen).

7. An arrow placed 2 cm from a convex lens with a focal length of 5 cm will produce an erect (upright), virtual (cannot be projected on a screen), and magnified (larger in size compared to the object) image.

8. A parabolic mirror, such as a parabolic reflector or a parabolic antenna, has the property of focusing all parallel rays of light (or electromagnetic waves) to a single point called the focus. It also reflects rays originating from the focus in a parallel direction, which is useful for applications like satellite dish antennas. Furthermore, parabolic mirrors can work for a wide range of electromagnetic waves, including radio waves.

9. De Broglie waves, proposed by Louis de Broglie, suggest that particles, such as electrons and protons, exhibit wave-like properties. They are not limited to sound waves or specific particles like hydrogen. De Broglie waves play a crucial role in understanding the wave-particle duality of matter.

10. The Lorentz factor, denoted as γ (gamma), is a term in special relativity. It modifies classical results as objects approach the speed of light, accounting for time dilation, length contraction, and relativistic mass increase. It is a key factor in understanding the effects of high-speed motion and is not limited to geometric optics.

11. In the Twin Paradox scenario, the traveling twin experiences time dilation due to their high velocity, causing them to age slower compared to the twin who stays at home. Thus, when they reunite, (b) the returnee is younger. This phenomenon is a consequence of special relativity and has been confirmed by experiments and observations.

12. Bohr's atomic model describes electrons in discrete energy levels or orbits. According to the model, electrons can jump to lower orbits, emitting photons in the process. They can also spontaneously jump to higher orbits. Additionally, the model suggests that the electron orbit would eventually decay, resulting in the electron spiraling into the proton. However, this aspect is not consistent with modern understanding and is considered a limitation of Bohr's model.

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If the room temperature mobility of electrons is 0.38 m2/V-s,  the drift velocity of electrons in germanium at room temperature when the magnitude of the electric field is 900 V/m is 342 m/s.

The formula to calculate drift velocity (v_d) is:

v_d = μ * E

where μ is the mobility of electrons in the material and E is the magnitude of the electric field.

Given that the mobility of electrons in germanium at room temperature is 0.38 m²/V-s and the magnitude of the electric field is 900 V/m, we can calculate the drift velocity as:

v_d = 0.38 * 900 = 342 m/s

Therefore, the drift velocity of electrons in germanium at room temperature when the magnitude of the electric field is 900 V/m is 342 m/s.

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Answer:

The sun gives off a type of light that carries energy, and the light from the desk lamp does not

Explanation:

I got it off a Quizlet hope this helps!!

Because of its interactions with molecules that excite them and lead them to move more quickly, infrared energy is perceived as heat, raising the internal temperature of the item receiving it.

Because the light from the desk lamp does not carry energy, whereas the light from the sun does. Due to the fact that sunlight transfers heat to molecules, while a desk lamp does not.

Because compared to light from a desk lamp, UV light contains energy. Because the mirror can only absorb the energy from the infrared lamp, which emits a sort of light that the desk lamp does not.

Sunlight's ultraviolet rays can cause paper and cloth to lose their colour. When ultraviolet light waves are present, the compounds in coloured dyes can degrade. Sunburns can also be brought on by ultraviolet rays.

Therefore, The light from the desk lamp does not carry energy, whereas the light from the sun does.

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Answer:

the force is very strong between

By being wary of these factors and following the recommended guidelines, you can ensure the safe and effective use of hemoconcentrators in medical procedures.

When using hemoconcentrators, it's essential to be cautious and consider a few factors to ensure their safe and effective use. Some things to be wary of with hemoconcentrators include:
1. Compatibility: Make sure the hemoconcentrator is compatible with your specific application and equipment to avoid any malfunctions or complications during the procedure.
2. Clotting risks: Hemoconcentrators can sometimes lead to increased blood clotting risks. Ensure appropriate anticoagulation measures are in place during the procedure to minimize this risk.
3. Flow rate: Be mindful of the blood flow rate through the hemoconcentrator. Exceeding the recommended flow rate could lead to hemolysis or other complications.
4. Sterility: Maintain a sterile environment and follow proper handling procedures to prevent contamination, which could potentially lead to infection.
5. Monitoring: Closely monitor the patient's vital signs, blood pressure, and fluid balance during the procedure to promptly identify and address any adverse reactions or complications.

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Answer:c 40kg

Explanation:

Answer:

B. 30 kg * m/s

Explanation:

college board answer

In this circuit, when the switch is opened at t=0, the current through the inductor gradually decreases over time, causing a voltage to develop across the inductor and a corresponding drop in the voltage across the resistor.

Based on the given information, we can draw the following circuit diagram:

    +-----R-----+

Vs --|            |

    |            +---> vr

    |            |

    +----L-----x--+  

                  |

                 ---

                 --- ix

                  |

                 GND

where

Before the switch is opened at t=0, the circuit is in steady-state, which means that the current through the inductor is constant and there is no voltage across the inductor. When the switch is opened at t=0, the current through the inductor cannot change instantaneously, so it will continue to flow in the same direction but will gradually decrease over time.

As the current decreases, a voltage will develop across the inductor, which will oppose the change in current.

To solve for ix and vr for t>0, we can use the differential equation that describes the behavior of the circuit:

\(L(di/dt) + R\times i = Vs\)

where

Taking the derivative of both sides with respect to time, we get:

\(L(d^2i/dt^2) + R(di/dt) = 0\)

This is a second-order linear homogeneous differential equation with constant coefficients. The characteristic equation is:

\(Lr^2 + Rr = 0\)

which has two roots:

The general solution to the differential equation is therefore:

\(i(t) = Ae^{(r1t)} + Be^{(r2t)}\)

\(= A + Be^{(-R/L\times t)}\)

where

A and B are constants that depend on the initial conditions.

To solve for A and B, we can use the initial conditions at t=0. Before the switch is opened, the current through the inductor is constant, so we have:

\(i(0-) = i(0+) = ix\)

After the switch is opened, the voltage across the inductor is zero, so we have:

\(vL(0+) = 0\)

Using Ohm's law, we can write:

\(vR = iR\)

where

vR is the voltage across the resistor, which is equal to vr.

Therefore, we have:

\(vr = iR = (di/dt)\times R\)

Taking the derivative of the equation for i(t), we get:

\(di/dt = -B\times (R/L)e^{(-R/Lt)}\)

Using the initial condition vL(0+) = 0, we can write:

\(vL = L(di/dt)\)

Substituting in the expression for di/dt and integrating with respect to time, we get:

\(vL = -BR/L \times (e^{(-R/L\timest)} - 1)\)

Using the fact that vL = 0 at t=0+, we can solve for B:

B = ix*R/L

Substituting this expression for B into the equation for i(t), we get:

i(t) = ix + (Vs/R - ix)e^(-R/Lt)

This matches the given expression for i(t), so we can confirm that:

To solve for vr, we can use the equation:

\(vr = (di/dt)R\)

\(vL = -BR/L \times (e^{(-R/L\times t)} - 1)\)

Therefore, in this circuit, when the switch is opened at t=0, the current through the inductor gradually decreases over time, causing a voltage to develop across the inductor and a corresponding drop in the voltage across the resistor.

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Given that the focal length of the object is F = 2.5 cm.

We have to find the position of the object such that no image is formed.

For a convex lens, the image will not be formed if it is placed at the focus.

Thus, the object should be placed at 2.5 cm as it is the focal length.

Answer:

How many questions should be answered??

Answer:

umm the lower the frequency the higher the pitch

Explanation:

The potential energy (PEg) of the metal ball is calculated using the formula PE = mgh, where m is the mass (6.3 kg), g is the acceleration due to gravity (9.8 m/s²), and h is the height (0.9815 m).

The kinetic energy (KE) of the ball is determined using the formula KE = mv²/2, where m is the mass (6.3 kg) and v is the velocity (15 m/s). Substituting the values, we find the ball's KE to be 708.75 J.

The potential energy (PEg) is the energy possessed by an object due to its position relative to the Earth's surface. To calculate it, we multiply the mass (6.3 kg), acceleration due to gravity (9.8 m/s²), and the height (0.9815 m). The resulting value is 61.3827 J, representing the potential energy of the ball.

The kinetic energy (KE) is the energy possessed by an object due to its motion. To determine it, we use the mass (6.3 kg) and velocity (15 m/s) in the formula KE = mv²/2. Plugging in the values, we find that the ball's KE is 708.75 J, representing the energy associated with its movement.

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