the electric motor of a model train accelerates the train from rest to 0.720m/s in 22.0milliseconds (ms). the total mass of the train is 875g. Find the average power delivered to the train during its acceleration.

Answer:

Average speed = 13.5 m/s

Explanation:

Since the car is running at a speed of 27 m/s  and it stops after 3 seconds by applying the brake. Therefore, the initial speed of the 27 m/s and final speed is 0.

Use below formula to find the average speed :

Average speed = (Initial speed + final speed ) / 2  

Average speed = (27 + 0 ) / 2

Average speed = 13.5 m/s

The Earth's inner core is thought to have stopped and perhaps reversed its rotation due to complex interactions between the inner and outer cores. The Earth's inner core is solid and surrounded by a liquid outer core.

The exact reason for the inner core's change in rotation is not yet fully understood, but some scientists believe it could be related to changes in the Earth's magnetic field or variations in the flow of the liquid outer core.

Some scientists believe that the inner core's rotation may play a role in the evolution of the Earth's magnetic field and the stability of the Earth's core.

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When Johnny lets a 0.5kg ball roll on the classroom floor, it gradually slows down due to friction. A free body diagram would include two main forces: gravitational force (Fg) acting downward and the normal force (Fn) acting upward.

Since the ball is on a horizontal surface, Fn and Fg cancel each other out. The other force acting on the ball is the frictional force (Ff), which opposes its motion. To calculate Ff, use the formula: Ff = μ * Fn, where μ is the coefficient of friction (0.18). As Fg and Fn are equal, Ff = μ * Fg = 0.18 * (0.5kg * 9.81m/s²) = 0.18 * 4.905 N = 0.8829 N. To find the acceleration of the ball (a), use Newton's second law: F = m * a. Rearrange the formula to find a: a = F / m. Since Ff is the only horizontal force acting on the ball, F = -Ff (the negative sign indicates that the force opposes motion). Therefore, a = -0.8829 N / 0.5 kg = -1.7658 m/s². In summary, the ball experiences an acceleration of -1.7658 m/s² due to friction, causing it to gradually slow down.

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The leaves are getting closer.

An electroscope is an early scientific instrument used to detect the presence of electrical charges in a body. The charge is detected from the motion of the test object due to the Coulombic electrostatic force acting on the test object. The amount of electric charge on an object is proportional to the voltage. The electroscope consists of a metal button and he two blades. When a negatively charged object is brought close to the instrument, the blade will repel and move away. There are two types of electroscopes: the medulla electroscope and the gold foil electroscope. When a negatively charged object is brought close to the electroscope, the charge induces a positive charge on the leaves. So nothing should happen. However, induction causes the leaves to move closer together.

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Answer:

Hello, I believe it would have a negative charge considering protons have a positive charge while elctrons have a negative charge

Explanation:

Answer:

A, 0.050 Hz

Explanation:

1) Frequency = speed divided by wavelength

time is 2* 60 = 120 seconds

distance = 6 wave lengths

speed = distance divided by time

speed = 6 wave lengths divided by 120

Hope this helps!

The Integration/Eclectic Theory is a broad concept encompassing various fields and concepts. Without specific context, providing a comprehensive answer is challenging. Nevertheless, potential drawbacks or criticisms associated with integration or eclectic approaches .

Integration or eclectic approaches can be discussed:

Lack of coherence: Integrating different perspectives, frameworks, or methodologies from multiple disciplines may broaden understanding but can also result in a lack of coherence or consistency. The components may not seamlessly fit together, leading to a fragmented or unclear theoretical framework.

  Overgeneralization: Eclectic approaches may incorporate diverse ideas without critically evaluating their compatibility or applicability in specific contexts. This can lead to overgeneralization or oversimplification of complex phenomena, disregarding important nuances or specific factors.

   Inconsistencies and contradictions: Combining different theories or approaches carries the risk of encountering inconsistencies or contradictions among the components. This can create confusion and hinder drawing clear conclusions or making accurate predictions.

   Lack of depth: Eclectic or integrative theories aiming to cover a wide range of perspectives may sacrifice depth. By attempting to include multiple viewpoints, the theory may not delve deeply into any one perspective, resulting in a superficial understanding of the underlying concepts.

   Difficulty in application: Applying eclectic theories can be challenging due to a lack of clear guidelines or principles. The absence of a unified framework makes it difficult to translate the theory into practical applications or develop specific interventions based on its recommendations.

It is important to note that these drawbacks are not inherent to all integration or eclectic theories. Some approaches successfully integrate multiple perspectives and provide valuable insights. However, it is crucial to critically evaluate the strengths and weaknesses of any theoretical framework to ensure its suitability for a particular context or research question.

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We know that,

Mass of skier is 25 kg

The system described by the transfer function G(s) = -co² s² + 2a + w², with a damping ratio of 1.3 and a natural frequency of 0.5, has an overdamped unit step response. So, the correct option is (E)

The transfer function of the system is given as G(s) = -co² s² + 2a + w², where co represents the damping ratio, a represents an arbitrary constant, and w represents the natural frequency of the system. We are given that the natural frequency is 0.5 and the damping ratio is 1.3.

To determine the type of unit step response, we need to analyze the damping ratio (co) in relation to the critical damping value (co_critical).

The critical damping ratio (co_critical) is defined as the value where the system is on the threshold between being overdamped and underdamped. It is given by the formula co_critical = 2 * sqrt(a * w²).

In our case, the natural frequency (w) is 0.5, so we can calculate co_critical as follows: co_critical = 2 * sqrt(a * 0.5²).

Since the damping ratio (co) is given as 1.3, we can compare it with co_critical to determine the type of unit step response.

If co > co_critical, the system is considered overdamped (Option E).

If co = co_critical, the system is considered critically damped (Option D).

If co < co_critical, the system is considered underdamped (Option C).

Based on the given values, we can determine that the system is overdamped (Option E) because the damping ratio (1.3) is greater than the critical damping ratio.

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(a) The acceleration of the crate  is  1.5 m/s^2

(b) The crate’s final velocity is 9 m/s.

To move the crate with a constant velocity, the force you apply must equal the force of friction. So, to move the crate, you must push with a force of 275 N.

If you push with a force of 380 N, the net force on the crate will be;

F (net)  380 N - 275 N = 105 N.

The acceleration of the crate will be given by Newton's second law of motion:

a = F / m

where;

So, substituting in the known values, we get:

a = 105 N / 70 kg = 1.5 m/s^2

Finally, if the crate started from rest, its final velocity after 6 seconds can be found using the equation:

v = at

v = 1.5 m/s^2  x  6s = 9 m/s

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Answer:

a) The period of the satellite is approximately 5,425.305 seconds (1.507 hours)

b) The orbital velocity of the satellite is approximately 7,725.8565 m/s

Explanation:

The given parameters are;

The mass of the satellite, m = 1,000 kg

The altitude at which the satellite is orbiting, h = 300 km

a) The period of the satellite is given as follows;

\(T = 2 \times \pi \times \sqrt{\dfrac{(R + h)^3}{g \times R^2} }\)

Where;

R = The radius of the Earth = 6.371 × 10⁶ m

g = The acceleration due to gravity = 9.81 m/s²

h = The altitude of the orbit of the satellite = 300 km = 300,000 m

By substitution, we have;

\(T = 2 \times \pi \times \sqrt{\dfrac{((6.371 + 0.3)\times 10^6)^3}{9.81 \times (6.371 \times 10^6)^2} } \approx 5,425.305\)

T ≈ 5,425.305 seconds ≈ 1.507 hours

b) The orbital velocity of the satellite is given as follows;

\(v_0 = \sqrt{\dfrac{G \times M_{central}}{R + h} } = \sqrt{\dfrac{g \times R^2}{R + h} }\)

Where;

v₀ = The orbital velocity of the satellite

Which by substitution gives;

\(v_0 = \sqrt{\dfrac{9.81 \times (6.371 \times 10^6)^2}{(6.371 + 0.3) \times 10^6} } = 7,725.8565\)

The orbital velocity, v₀ = 7,725.8565 m/s.

The time interval required for the sail to reach the Moon is approximately 1980 seconds.

To solve this problem, we'll use the principles of radiation pressure and Newton's second law of motion.

(a) The force exerted on the sail can be calculated using the formula:

  Force = Solar Intensity x Area

  Given:

  Solar Intensity = 1370 W/m^2

  Area = 5.00 x 10^5 m^2

  Plugging in the values, we get:

  Force = 1370 W/m^2 x 5.00 x 10^5 m^2

  Force = 6.85 x 10^8 N

  Therefore, the force exerted on the sail is 6.85 x 10^8 N.

(b) The sail's acceleration can be determined using Newton's second law:

  Force = Mass x Acceleration

  Rearranging the equation:

  Acceleration = Force / Mass

  Given:

  Mass = 6300 kg (mass of the sail)

  Plugging in the values, we get:

  Acceleration = (6.85 x 10^8 N) / (6300 kg)

  Acceleration ≈ 1.09 x 10^5 m/s^2

  Therefore, the sail's acceleration is approximately 1.09 x 10^5 m/s^2.

(c) To calculate the time interval required for the sail to reach the Moon, we can use the equation of motion:

  Distance = (1/2) x Acceleration x Time^2

  Rearranging the equation:

  Time = √(2 x Distance / Acceleration)

  Given:

  Distance = 3.84 x 10^8 m (distance to the Moon)

  Acceleration = 1.09 x 10^5 m/s^2 (from part b)

  Plugging in the values, we get:

  Time = √(2 x 3.84 x 10^8 m / 1.09 x 10^5 m/s^2)

  Time ≈ 1980 seconds

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Answer:

You input potential (stored) energy into the rubber band system when you stretched the rubber band back. Because it is an elastic system, this kind of potential energy is specifically called elastic potential energy. ... When the rubber band is released, the potential energy is quickly converted to kinetic (motion) energy.

Explanation:

The lamp descends with the elevator so its acceleration is also 2.9 m/s². Take downward to be the positive direction. Then the net force on the lamp is

∑ F = w - t = ma

where w = mg = weight of lamp, t = tension in the cord, m = mass of lamp, and a = acceleration. Then

mg - t = ma

mg - ma = t

m (g - a) = t

m = t / (g - a)

so that the lamp's mass is

m = (52 N) / (9.8 m/s² - 2.9 m/s²) ≈ 7.5 kg

The tiny ripples in the background radiation COBE found are due to the quantum fluctuations that occurred during cosmic inflation.

What is COBE?

The Cosmic Background Explorer (COBE) is a satellite that was launched in 1989 to study the cosmic microwave background radiation. It was the first satellite mission dedicated solely to cosmology, and it provided groundbreaking insights into the early universe.

What is the cosmic microwave background radiation?

The cosmic microwave background radiation is a faint glow of electromagnetic radiation that permeates the entire universe. It is thought to be the remnant of the Big Bang, and it has been detected in every direction of the sky.

What are quantum fluctuations?

Quantum fluctuations are tiny variations in the energy density of the early universe. They are a natural consequence of the uncertainty principle in quantum mechanics, and they played a crucial role in the formation of the large-scale structure of the universe.

What is cosmic inflation?

Cosmic inflation is a period of exponential expansion that occurred in the early universe. It is thought to have happened within the first 10^-32 seconds after the Big Bang, and it is responsible for the large-scale homogeneity and isotropy of the universe. Cosmic inflation was proposed in the early 1980s to solve some of the problems with the Big Bang model.

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The distance "l" in front of the convex lens should be: \(f(o - f)/(f + i)\). The formula to determine the position of the image is: \(1/f = 1/o + 1/i\)

If the concave lens has the focal length given in the problem statement, then it should be placed at a distance "l" in front of the convex lens. The formula to determine the position of the image is:

\(1/f = 1/o + 1/i\) Where, f = focal length of the concave lens

o = distance of the object from the concave lens

i = distance of the image from the concave lens

First, determine the position of the image using the formula given above. This image will act as the object for the convex lens. Next, use the formula for the convex lens to determine the distance "l". The formula for the convex lens is: \(1/f = 1/i + 1/o\)

Where, f = focal length of the convex lens

\(1/o + 1/i = 1/f1/o + 1/(l + i)\)

= \(1/f1/(l + i)\)

= \(1/f - 1/o1/(l + i)\)

= \((o - f)/fo - f\)

=\(-f(l + i)l + i\)

= \(f(o - f)/fl\)

= \(f(o - f)/(f + i)\)

Therefore, the distance "l" in front of the convex lens should be:\(f(o - f)/(f + i)\).\((o - f)/fo - f\)

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Acceleration will increase as the angle of incline does, and as a result, force will as well.

The gravitational force acting on the cart increases as the slope of the incline increases, causing it to accelerate more quickly.The ramp's steepness will cause an increase in inclination. As a result, the acceleration increases as the inclination angle increases. This acceleration causes the object to descend with greater speed.

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Answer:

c

Explanation:

i just did this study island and the answer was wrong

Answer:

The hunter should aim directly at the perched monkey because the tranquilizer dart will fall away from the line sight at the same rate that the monkey falls from its perch.

Tan theta = 9 / 90 = .1      so theta = 5.71 deg

The time for the monkey to reach the ground is

t = (2 h / g)^1/2 = (18 / 9.8)^1/2 = 1.36 sec

So the horizontal speed of the dart must be at least

Vx = 90 m / 1.36 sec = 66.4 m/s

Vx = V cos theta

V = 66.4 m/s / cos 5.71 = 66.7 m/s

The angle of projection of the tranquilizer dart is 5.7⁰

The horizontal speed of the tranquilizer dart is 66.5 m/s

The given parameters;

The angle of projection of the tranquilizer dart is calculated as;

\(tan(\theta) = \frac{y}{x} \\\\tan(\theta) = \frac{9}{90} \\\\tan(\theta) = 0.1\\\\\theta = tan^{-1}(0.1)\\\\\theta = 5.71 ^0\)

The speed of the tranquilizer dart is calculated as;

X = v₀ₓt

where;

t is the time to reach maximum height

X is the horizontal displacement = 90 m

The time to reach maximum height is calculated as;

\(h = v_0_yt + \frac{1}{2} gt^2\\\\h = 0 + \frac{1}{2} gt^2\\\\h = \frac{1}{2} gt^2\\\\t = \sqrt{\frac{2h}{g} } \\\\t = \sqrt{\frac{2\times 9}{9.8} } \\\\t = 1.36 \ s\)

The horizontal speed of the tranquilizer dart is calculated as;

\(X = v_0cos(\theta) \times t\\\\90 = v_0\times cos(5.71) \times 1.36\\\\90 = 1.353 v_0\\\\v_0= \frac{90}{1.353} \\\\v_0 = 66.5 \ m/s\)

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We will have that the picture that shows the highest average kinetic energy is image B.

Answer:

Tide rising and falling would be different from the moon near the Earth .

Answer:

Is this a research paper?

By finding the specific heat, we can expect that the material of the block is copper or silver (or a mix).

We know that we give 13,500 joules of energy to the metal block (which we assume has a mass of 1kg) and the temperature increases from 15°C to 60°C.

Then the increase is:

60°C - 15°C = 45°C

Then this metal has a specific heat of:

H = 13,500j/(45°C*1 kg) = 300 J/°C*kg

So it could be copper, which has a specific heat of 380J/°C*kg or Silver, which has a specific heat of 240 J/°C*kg (or a mix of these two).

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Answer:

girl what- I can't answer this but I need points so I'ma just put this random lol sorry tho . ask the tutor

Answer:

10 joules

Explanation:

formula for kinetic energy= 1/2mv²

mass (m) given = 5kg

velocity (v) given = 2m/s

therefore, by inputting them into the formula

= 1/2(5)(2)²

= 1/2 x 5 x 2²

= 1/2 x 5 x 4

= 1/2 x 20

= 10J

Answer:

False. Not everything can turn into a black hole. The formation of a black hole requires a massive object, typically a star, to collapse under its own gravity. This collapse causes the object to become so dense that it creates a singularity, a point of infinite density at the center of the black hole, which is surrounded by an event horizon, the point of no return beyond which nothing, not even light, can escape. So, only objects with sufficient mass and gravity can become black holes.

Explanation:

As we move from left to right the metalic properties decreases and non-metalic property increases hence reactivity of the elements decreases.

It happens because there are more valence shells and less attraction between valence electrons and the nucleus. Consequently, the propensity to take electrons from other atoms declines. Atoms become more electronegative as they move through a period.

The ability to lose electrons increases generally with atom size. The capacity to lose electrons increases with increasing shielding. The most active metal is to the left and down because metallic character grows down the table and diminishes across it.

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