Compared with stars in the disk, orbits of stars in the halo:____.

a. are confined to a relatively thin plane.

b. do not have to be around the galactic center.

c. do not have to pass through the plane of the galaxy.

d. are elliptical, orbiting in the same direction.

e. are elliptical, with random orientations.

Answer:

It is observed that when a compass is brought near a current carrying conductor the needle of compass gets deflected because of flow of electricity. This shows that electric current produces a magnetic effect.

Answer:

Ep=mgh

Ep=419000×9.8×30

Ep=123,186,000 J

the gravitational potential energy is 123 186 000 joules

The work done by the boy on the weight is 60 Nm.

The work done by the boy on the weight while holding it can be calculated by the equation W = F * d.

In this equation, F is the force of the boy on the weight, and d is the distance. Since the weight is 40-N and the distance is 1.5 m,

the work done by the boy on the weight is W = 40 N * 1.5 m = 60 Nm.

Work done is elaborated in such a way that it includes both forces exerted on the body and the total displacement of the body.

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Answer:

the answer of this question is iii .

if the answer is wrong so sorry

The flux through the paper when the paper is turned 25° with respect to field will be 22.67 \(Nm^{2} /C\).

We have a piece of paper is held with one face perpendicular to a uniform electric field the flux through it is 25 \(Nm^{2} /C\).

Now we have to calculate the flux through the paper if it is turned 25° with respect to the field.

Electric flux (E) through a surface is defined as the dot product of Electric field vector and Normal vector to the surface. The formula to calculate the electric flux is -

Φ = \(\vec{E}.\vec{A}\) = E x A x cosθ

In the question it is given that when one face perpendicular to a uniform electric field the flux through it is 25 \(Nm^{2} /C\). In this case θ = \(0^{o}\).

Therefore -

E x A x cos \(0^{o}\) = 25

EA = 25 \(Nm^{2} /C\)

When the paper is turned \(25^{o}\) with respect to field, then the flux through it can be calculated as follows -

Φ = 25 x cos (\(25^{o}\)) = 22.67 \(Nm^{2} /C\).

Hence, the flux through the paper will be 22.67 \(Nm^{2} /C\).

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A sound wave is a type of mechanical wave that is created by the vibration or disturbance of particles in a medium, usually air. Sound waves are characterized by their frequency, wavelength, amplitude, and speed.

A compression wave, like sound, is a kind of longitudinal wave.
When a wave reflects off a surface, the angle of incidence always equals the angle of reflection.
The wailing change of the pitch that you hear as a locomotive approaches and then recedes from you is called the Doppler effect.

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Answer:

B

Explanation:

Got it right

Answer:

B. X: Releases energy to the photosphere

Y: Takes longer for photons to move through

Explanation:

Right on ED2021, goodluck!

If ocean water did not move, it would be hot in the equatorial region and frigid in the polar regions.

Ocean currents are responsible for redistributing heat around the planet. Without these currents, the equatorial region would receive more sunlight and heat than it loses, resulting in an accumulation of heat in the water. On the other hand, the polar regions would lose more heat than they receive, resulting in frigid temperatures.

The rotation of the Earth also influences the movement of ocean water through the Coriolis effect. Without this effect, ocean currents would be less predictable, and their impact on climate and temperature distribution would be more severe. Therefore, ocean currents play a crucial role in regulating Earth's climate, and their disruption could have significant consequences for both marine life and global weather patterns.

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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:

the answer is 4.15 m/s2

Explanation:

4.15 m/s2

Answer:

v = 1.5 m/s

Explanation:

m = 85 kg

p = 125 kg m/s

v = ?

p = m v

125 kg m/s = (85 kg) (v)

v = (125 kg m/s) / (85 kg)

v = 1.47 m/s

2023 leaf has a standard portable 120/240-volt evse cable that can be used for the following:

This refers to a electric vehicle supply equipment cable which supplies electricity to an electric vehicle.

It can be connected to a 120/240-volt outlet with charging occurring on the both of them.

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Answer:

The far from the right end is the person was 1.6

Nitrile Gloves  gloves are safe for working with electricity.

A synthetic rubber made from acrylonitrile and butadiene, nitrile rubber is also referred to as nitrile butadiene rubber, NBR, Buna-N, and acrylonitrile butadiene rubber. Trade names like Perbunan, Nipol, Krynac, and Europrene are also used. Being resistant to chemicals, fuel, and oil makes this rubber special.

These gloves are therefore the best option for anyone who must handle potentially dangerous and caustic chemicals. Being incredibly puncture-resistant and removing the possibility of latex allergic reactions, they are also ideal for the majority of medical settings.

The robust barrier of protection provided by nitrile gloves can help keep the wearer safe from chemicals, acids, and oils. Latex-free: Nitrile gloves are excellent for anyone with sensitive skin or a latex allergy because they are latex-free, unlike natural rubber gloves.

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Answer:

A physical property of matter is electric charge. It is caused by an imbalance in the number of protons and electrons in a material. Whether there are more protons than electrons in a substance, it is positively charged if there are more electrons than protons, it is negatively charged.

Explanation:

Answer:

The only thing you need to know which pair of features that best characterizes a sound wave is to view the graph or the image of monitor.

Explanation:

The heat that is evolved by the environment is 36.42 kJ.

We know that heat is a form of energy that can be known for the fact that it could lead to a change in the temperature of the object. We have to note that the energy that is released is a sum total of all the process that are involved here.

We know that;

H = (15 * 4.18 * (135 - 100)) + (15 * 2240) + (15 * 4.18 * (100 - 90))

H = 2194.5 + 33600 + 627

H = 36.42 kJ

The total heat that has been evolved would now be 36.42 kJ.

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Answer:

5.25%

Explanation:

From the question given above, the following data were obtained:

Accepted value = 238857 miles

Measured value = 226316 miles

Percentage error =.?

Next, we shall determine the absolute error. This can be obtained as follow:

Accepted value = 238857 miles

Measured value = 226316 miles

Absolute Error =?

Absolute Error = |Measured – Accepted|

Absolute Error = |226316 – 238857|

Absolute Error = 12541

Finally, we shall determine the percentage error. This can be obtained as follow:

Accepted value = 238857 miles

Absolute Error = 12541

Percentage error =.?

Percentage error = absolute error / accepted value × 100

Percentage error

= 12541 / 238857 × 100

= 1254100 / 238857

= 5.25%

Therefore, the percentage error is 5.25%.

The acceleration is of mother before child reaches half a revolution is,
a) 0.42 radians per second squared b) 0.42 radians per second squared

If both are moving in the same direction, the relative velocity of the child with respect to the mother is the angular velocity of the carousel, which is 2π radians per minute. The mother needs to cover the same distance as the child in half the time, so her relative velocity with respect to the child must be twice the angular velocity of the carousel, which is 4π radians per minute.

To calculate the required acceleration, we can use the formula: acceleration = (final velocity - initial velocity) / time. Since the mother starts from rest and reaches a velocity of 4π radians per minute, the final velocity is 4π radians per minute. The time to cover half a revolution is 30 seconds. Therefore, the acceleration required for the mother to catch up with the child is,

acceleration = (4π - 0) / 30 = 4π/30 ≈ 0.42 radians per second squared

If both are moving in opposite directions, the relative velocity of the child with respect to the mother is the sum of their individual angular velocities. Since the mother is moving in the opposite direction to the carousel, her angular velocity is -2π radians per minute. Therefore, the relative velocity is (2π - (-2π)) = 4π radians per minute.

Using the same formula as before, the acceleration required for the mother to catch up with the child is,

acceleration = (4π - 0) / 30 = 4π/30 ≈ 0.42 radians per second squared

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--The complete question is, A carousel completes 1 revolution every minute. A mother realizes that her child is about to fall and starts moving to protect him when the child already has a 90-degree lead. What acceleration must she reach to catch up with him before the child completes half a revolution? a) If both are moving in the same direction? b) If both are moving in opposite directions?--

The two options that help explain why the rotation of a conducting loop between the poles of a magnet generates a potential difference are:

(A) The magnetic field changes its direction relative to the loop.

(D) The angle between the loop and the magnetic field changes.

In a simple generator, a conducting loop rotates between the poles of a magnet, resulting in the generation of a potential difference. Two factors contribute to this phenomenon.

Firstly, as the loop rotates, the magnetic field lines passing through it change their direction relative to the loop (option A). This change in the magnetic field induces a changing magnetic flux through the loop.

According to Faraday's law, this changing magnetic flux induces an electromotive force (EMF) or a potential difference across the loop. Secondly, as the loop rotates, the angle between the loop and the magnetic field changes (option D).

This change in angle alters the component of the magnetic field perpendicular to the loop, further contributing to the generation of a potential difference.

Together, these changes in the magnetic field and the angle between the loop and the magnetic field lead to the generation of a potential difference, enabling the functioning of the generator.

Therefore the correct options are (A) The magnetic field changes its direction relative to the loop and (D) The angle between the loop and the magnetic field changes.

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The option that represents your employer's responsibility is to develop a  written hazard communication program. Thus, the correct option for this question is A.

The advantages of a communication program are as follows:

The responsibility of the employer is to develop and articulate the concept of a hazard communication program in detailed written form in order to satisfy the need and requirements of the team, person, society, etc. This becomes more important when it comes to synthesizing the thinking of large members in a single format.

Therefore, developing a written hazard communication program is an option that represents your employer's responsibility. Thus, the correct option for this question is A.

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Cu = 0.385 J/gC, show smallest temperature change upon gaining 200 J.

Calculation:-

50.0 g Cu , Cu = 0.385 J/gC, will show the smallest change in temperature.

Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius.

In A  temperature change = (50 × 0.903)/ 200 = 0.22575 °C

In B temperature change = (50 × 0.385)/200 = 0.09625 °C,

Therefore, 50.0 g Cu , Cu = 0.385 J/gC, will show the smallest change in temperature.

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Disclaimer:- Your question is incomplrte, please see below for complete question.

which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 j of heat? which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 j of heat?

a. 50.0 g fe,

b. 0.385 J/gC

c. both

d. none

It would take 1.556 seconds for the barrier to crumple and safely slow down the person with a force of 1180 N.

To calculate the time required to crumple the barrier and safely slow down the person, we can use the concept of impulse.

The impulse, denoted by J, is defined as the product of force and time, and it represents the change in momentum of an object. In this case, the impulse required to safely slow down the person can be calculated using the maximum force and the person's initial momentum.

The momentum of a person is given by the product of their mass and velocity:

Momentum = mass × velocity

Given that the person's mass is 68 kg and their velocity is 27 m/s, the initial momentum is:

Initial momentum = 68 kg × 27 m/s

To safely slow down the person, the impulse provided by the barrier should be equal to the change in momentum.

Therefore, we have:

Impulse provided by barrier = Final momentum - Initial momentum

Since the person is brought to rest, the final momentum is zero. Thus, we have:

Impulse provided by barrier = -Initial momentum

Now we can express the impulse in terms of force and time:

Impulse provided by barrier = Force × Time

Plugging in the known values, we can solve for time:

-Initial momentum = Force × Time

68 kg × 27 m/s = 1180 N × Time

Simplifying the equation, we find:

Time = (68 kg × 27 m/s) / 1180 N

Evaluating the expression:

Time = 1836 kg·m/s / 1180 N

Finally, converting kg·m/s to seconds, we get:

Time ≈ 1.5559 seconds

Therefore, it would take approximately 1.556 seconds for the barrier to crumple and safely slow down the person with a force of 1180 N.

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Answer:

Hydrochloric acid and sodium hydroxide interact, resulting in salt and a release of heat. As we can see, the result of the interaction of two highly aggressive compounds is table salt and water – compounds that are ultimately harmless, even beneficial, to human beings.

Explanation:

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The flash and report method is a simple and common technique used to measure the speed of sound. In this method, an observer measures the time between seeing a flash, such as from a gunshot or a firecracker, and hearing the corresponding sound. The observer is usually at a known distance from the source of the flash and sound.

To perform the experiment, the observer stands at a fixed distance away from the source of the flash and sound. When the flash is seen, they start a stopwatch or use any other timing device. Once they hear the sound, they stop the timer and note the time difference between the flash and the sound. This time difference is the time it takes for the sound to travel from the source to the observer.

The speed of sound can then be calculated using the formula: speed of sound = distance / time taken. The distance between the observer and the source is divided by the time difference recorded to find the speed of sound in the medium (usually air).

It is essential to ensure that the distance between the source and the observer is accurate and that the observer's reaction time is considered when measuring the time difference. External factors such as temperature, humidity, and altitude also affect the speed of sound and should be taken into account.

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The probable question may be:

Discuss the measurement of the speed of sound using the flash and report method?

Let's take this problem step-by-step:

What does this problem want to solve:

 ⇒ find two pendulums that will swing back and forth in the least amount

     of time

Therefore:

 ⇒ must find the equation that calculates that period or swing time of a

     pendulum

     Equation: \(T = 2\pi \sqrt{\frac{L}{g} }\)

Based on the equation:

  ⇒ the longer the string is ⇒ the greater the swing time

Thus:

 ⇒ pendulum Y and Z will have the least amount of swing time

Answer: (B)

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The magnitude\(F_{P}\)  of the force you need to exert on the crate to make it continue to slide along the floor with constant velocity is  437.5N.

The Normal Force (in a horizontal plane, it is comparable to the mass by gravity) and the Kinetic Coefficient of Friction must be multiplied in order to obtain the Friction Force, which must be used in order to solve this problem.

Given that the sentence does not specify the value of the coefficient of friction, I will ascribe a value of 0.5 between the crate and the ground. If a different value has been specified for this coefficient, the below equation will simply need to be changed to reflect it.

\(F_{P}\) = µK N

µK = Friction coefficient

Normal Force is N.

Replacing,

\(F_{P}\) = 0.5 × 875

\(F_{P}\) = 437.5N.

Consequently, the crate is subject to a friction force of 437.5N.

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Complete question is "Suppose you have to move a heavy crate of weight 875 {\rm N} by sliding it along a horizontal concrete floor. You push the crate to the right with a horizontal force of magnitude 300 {\rm N}, but friction prevents the crate from sliding. Now assume that the crate is sliding along the floor with constant velocity. What is the magnitude F_p of the force you need to exert on the crate to make it continue to slide along the floor with constant velocity?"