suppose a woman does 550 j of work and 9800 j of heat transfer occurs into the environment in the process. (a) what is the decrease in her internal energy (in kcal), assuming no change in temperature or consumption of food? (that is, there is no other energy transfer.) -10350 kcal (b) what is her efficiency (in percent)? %

Answer:

58.933195 u or 59 u

Explanation:

Atomic mass of cobalt is 58.933195 u

Answer:

The answer would be A

Explanation:

Answer:

yes Compression and rarefaction are commonly used with longitudinal waves. And Crests and trough are commonly used with transverse waves!

Explanation:

The phenomenon where the volume of solids such as metal changes with temperature is called thermal expansion/contraction. In heat, atoms in the solid move faster, resulting in thermal expansion, while in the cold, they move slower, leading to thermal contraction. This can be seen in phenomena like metal train tracks buckling in heat.

The phenomenon where solids, such as metal, change their volume with temperature is known as thermal expansion/contraction. In response to heat, atoms in a solid move faster and occupy a larger volume - this is thermal expansion. Conversely, when cooled, atoms in a solid move slower and occupy a smaller volume, which is known as thermal contraction.

For example, in everyday life, you might see thermal expansion in action when metal train tracks 'buckle' in high heat, or on a smaller scale, when a metal ring becomes easier to remove from your finger in cold weather, due to thermal contraction.

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What is the combined force, and its direction?

Let us add the two vectors head to tail:

First convert from polar to Cartesian (to 2 decimals):

Sam's Vector:

x = r × cos( θ ) = 200 × cos(60°) = 200 × 0.5 = 100

y = r × sin( θ ) = 200 × sin(60°) = 200 × 0.8660 = 173.21

Alex's Vector:

x = r × cos( θ ) = 120 × cos(−45°) = 120 × 0.7071 = 84.85

y = r × sin( θ ) = 120 × sin(−45°) = 120 × -0.7071 = −84.85

Add them:

(100, 173.21) + (84.85, −84.85) = (184.85, 88.36)

That answer is valid, but let's convert back to polar as the question was in polar:

r = √ ( x2 + y2 ) = √ ( 184.852 + 88.362 ) = 204.88

θ = tan-1 ( y / x ) = tan-1 ( 88.36 / 184.85 ) = 25.5°

Sam pulls with 200 Newtons of force at 60° and Alex pulls with 120 Newtons of force at 45°  the combined force is 204.88 N  and its direction 25.5°.

Force is an external agent that can change the state of rest or state of motion of a body. Force is a vector quantity it have magnitude and direction. S.I unit of force is Newton. Addition of force is done using vector addition law.

Let us convert from polar to Cartesian coordinate,

Sam's Vector:

x = r × cos( θ ) = 200 × cos(60°) = 200 × 0.5 = 100

y = r × sin( θ ) = 200 × sin(60°) = 200 × 0.8660 = 173.21

Alex's Vector:

x = r × cos( θ ) = 120 × cos(−45°) = 120 × 0.7071 = 84.85

y = r × sin( θ ) = 120 × sin(−45°) = 120 × -0.7071 = −84.85

Adding Sam's Vector and Alex's Vector,

(100, 173.21) + (84.85, −84.85) = (184.85, 88.36)

Let us convert the Cartesian coordinate to polar coordinate,

r = √ ( x2 + y2 ) = √ ( 184.852 + 88.362 ) = 204.88

θ = tan-1 ( y / x ) = tan-1 ( 88.36 / 184.85 ) = 25.5°

The resultant force and direction is given as  204.88 N, 25.5°.

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200N force is needed to stop a 100-kg football player if she negatively accelerates (decelerates) at 20 m/s2

we have given in the statement

mass=100kg

acc= -20m/s^2

F=?

from newton's formula, we will find force

F=ma

F=100kg×20m/s^2

F=200N

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The cycle time of the entire line is 30.00528 minutes per part.

To calculate the cycle time of the entire line, we need to consider the processing times, failures, and repairs of both the milling machine and the turning machine.

For the milling machine:

Mean processing time (t0) = 15 mins

Standard deviation of processing time (sigma0) = 3 mins

Mean time to failure (MTTF) = 750 mins

Mean time to repair (MTTR) = 200 mins

For the turning machine:

Mean processing time (t0) = 15 mins

Standard deviation of processing time (sigma0) = 3 mins

Mean time to failure (MTTF) = 110 mins

Mean time to repair (MTTR) = 38 mins

We also know that the arrival rate to the milling machine is 1.2 parts/hr, with a coefficient of variation (CV) of 1.

To calculate the cycle time, we can use the following formula:

Cycle time = Processing time + Failure time + Repair time

Processing time:

The processing time is the sum of the mean processing times of the milling machine and the turning machine:

Processing time = t0 (milling machine) + t0 (turning machine) = 15 mins + 15 mins = 30 mins

Failure time:

The failure time is the inverse of the MTTF, considering the arrival rate:

Failure time = 1 / (MTTF * Arrival rate) = 1 / (750 mins * (1.2 parts/60 mins)) = 0.00111 parts/min

Repair time:

The repair time is the inverse of the MTTR, considering the coefficient of variation (CV):

Repair time = 1 / (MTTR * CV) = 1 / (200 mins * 1.2) = 0.00417 parts/min

Cycle time:

Cycle time = Processing time + Failure time + Repair time = 30 mins + 0.00111 parts/min + 0.00417 parts/min

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Answer:

Energy transformation is when energy changes from one form to another – like in a hydroelectric dam that transforms the kinetic energy of water into electrical energy. While energy can be transferred or transformed, the total amount of energy does not change – this is called energy conservation.

Explanation:

cause it is energy

The elements which are in the unknown according to the diagram given is He and is therefore denoted as option C.

This is referred to as a type of graph which shows the intensity of light being emitted over a range of energies and it varies with properties such as wavelength or frequency. When light is passed through a prism, band of colors are usually observed which signifies light spectrum with the plural being spectra.

In the diagram given , the element He and the unknown have the most similar spectra observed as a result of the lines which fall in almost the same range and place and it makes it the most likely component of the mixture of unknown gases.

This is therefore the reason why option C was chosen as the most appropriate choice.

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Answer:

If this is your question... the answer is C.

Explanation:

For edge:)

Answer:

C on edge2021

The average potential difference across the coil is: 9 × 10⁻³ volts or 9 millivolts when the magnetic field strength changes as described.

To find the average potential difference, we can use Faraday's law of electromagnetic induction, which states that the induced electromotive force (EMF) in a coil is equal to the rate of change of magnetic flux through the coil. The formula for Faraday's law is:

EMF = -N × (ΔΦ/Δt)

where EMF is the induced electromotive force, N is the number of turns in the coil, ΔΦ is the change in magnetic flux, and Δt is the time interval.

First, we need to convert the cross-sectional area from cm² to m²:

1000 cm² × (1 m / 100 cm)² = 0.1 m²

Next, we calculate the change in magnetic flux:

ΔΦ = (10^-4 Wb/m³ - 10^-3 Wb/m²) × 0.1 m² = -9 × 10⁻⁵ Wb

Now, we can plug the values into Faraday's law formula:

EMF = -100 × (-9 × 10⁻³ Wb / 0.1 s) = 9 × 10⁻³ V

Therefore, the average potential difference across the coil is 9 × 10⁻³volts or 9 millivolts when the magnetic field strength changes as described.

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The mass of helium in the Goodyear blimp is approximately 0.8088 kg.

To calculate the mass of helium in the Goodyear blimp, we can use the ideal gas law, which relates the pressure, volume, temperature, and number of moles of a gas.

The ideal gas law can be written as:

PV = nRT

where P is the absolute pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the universal gas constant, and T is the temperature of the gas in Kelvin.

Rearranging the equation to solve for n, we get:

n = PV / RT

Substituting the given values, we get:

n = (1.05 x 10^5 Pa) x (4700 m^3) / [(8.31 J/mol·K) x (273 K)]

Simplifying, we get:

n = 202.2 mol

The mass of helium can be calculated using the molar mass of helium, which is approximately 4 grams per mole.

Therefore, the mass of helium in the blimp is:

mass = n x molar massmass = (202.2 mol) x (4 g/mol)mass = 808.8 g or 0.8088 kg

The mass of helium in the Goodyear blimp is approximately 0.8088 kg.

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Answer:

Explanation:

For every action (or force), there is an equal and opposite action (or force).

Since the collision is elastic, the total kinetic energy of the system will remain the same after the collision.

For the conservation of momentum, we have the following equation:

Now, from the kinetic energy conservation, we have:

From the first equation, we have vf2 = 8 - 2vf1. Using this value on the second equation, we have:

Solving this quadratic equation, we have vf1 = 1.33 or vf1 = 4.

vf1 = 4 represents the initial situation, before the collision, so we have vf1 = 1.33 m/s.

Calculating vf2, we have:

Rounding to two significant figures, we have vf1 = 1.3 m/s and vf2 = 5.3 m/s.

Electrons are the particle will be deflected toward the positive plate as it enters the electric field.

An electric field is an electric property that is connected with any location in space where a charge exists in any form. The electric force per unit charge is another term for an electric field.

The field's direction is determined by the direction of the force acting on the positive charge. A positive charge produces a radially outward electric field, whereas a negative charge produces a radially inward electric field.

A physical field that surrounds electrically charged particles and exerts a force on all other charged particles in the field, either attracting or repelling them, is referred to as an electric field.

Hence,electrons are the particle will be deflected toward the positive plate as it enters the electric field.

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Answer:

1298.5watt

Explanation:

Power is defined as the rate at which work is done

Expressed mathematically as;

P = F × d/ t; F = force or weight of object ;d is height or distance sustain and t is time covered

Hence for 1 person the power consumption is ;

Note weight =mass× acceleration of free fall due to gravity,g

g is known as 9.8m/S2

Time taken is 1min which is 60 sec

60 ×9.8 × 5.3/60 = 51.94 watt

Hence for 25 persons we have

25 × 51.94 =1298.5watt

1.3kilo watt( kilo is 1000)

The work done by the escalator is 3,080.4 joules and the power requirement of the escalator to move 25 passengers every minute is approximately 51.34 watts.

The Work Done is calculated as:

Force (F) = 60 × 9.8

Distance (d) = 5.30 meters

Work (W) = F × d

Work (W) = (60 × 9.8) × 5.30

Work (W) = 3,080.4 joules

The Power is calculated as:

Time (t) = 1 minute

Power (P) = Work / Tim (t)

Power (P) = 3,080.4 / 60

Power (P) = 51.34 watts

Therefore, the power requirement of the escalator to move 25 passengers every minute is approximately 51.34 watts.

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The tension in the cello string is approximately 88.6 N.

The frequency of the fundamental mode of vibration of a string can be calculated using the formula:

f = (1/2L) √(T/μ)

Where

We can rearrange this formula to solve for the tension T:

T = (4π^2μL^2)f^2

Where we have substituted the given frequency f and the length of the string L.

The linear mass density of the string μ is given by the mass per unit length, which can be calculated as:

μ = m/L

Where m is the mass of the string.

Substituting the given values into the formula for T, we get:

T = (4π^2)(m/L)(L^2)(f^2)

T = 4π^2mf^2

T = 4π^2(0.0018 kg)(113 Hz)^2

T ≈ 88.6 N

Therefore, the tension in the cello string is approximately 88.6 N.

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Answer:B

Explanation:

Answer:

Explanation:

Answer:

Active energy is a characteristic of Kinetic energy

The average angular acceleration of the figure skater during the time interval of 4.6 s is 0.99 rad/s².

For this question:

Then,

angular acceleration = Change in angular velocity / time

α = ω2 - ω1 / t

α = 7.7 - 3.2 / 4.6

α = 4.5/4.6

α = 0.99 rad/s²

Thus, the average angular acceleration of the figure skater during the time interval of 4.6 s is 0.99 rad/s².

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The crate can safely rest on an incline of up to approximately 4.3° without tipping over.

To determine the maximum angle of incline the crate can rest on without tipping over, we need to calculate the point at which the center of gravity is directly above the base of the crate.

The center of gravity of the crate is currently 20 cm (0.2 m) above the true center. Therefore, the distance from the center of gravity to the base is s/2 + 0.2 m.

Using the Pythagorean theorem, we can calculate the diagonal distance from the base to the center of gravity as follows:

d = √(s^2 + (s/2 + 0.2)^2)

Plugging in the value of s = 2.3 m, we get:

d = √(2.3^2 + (2.3/2 + 0.2)^2)
d = √(5.29 + 1.89)
d = √7.18
d ≈ 2.68 m

Now, we can use trigonometry to find the maximum angle of incline that the crate can rest on without tipping over.

The tangent of the angle of incline is equal to the height of the incline (which is the same as the height of the center of gravity above the base) divided by the length of the diagonal distance:

tan θ = 0.2 / 2.68

θ = tan⁻¹(0.2 / 2.68)

θ ≈ 4.3°

Therefore, the crate can safely rest on an incline of up to approximately 4.3° without tipping over.

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Answer:

Increase the amount of gas

Explanation:

By increasing the pressure of the solution, the amount of gas will have to increase. Solubility of gases increases as the pressure is made to increase. Before the pressure was increased, the gases moved freely about. But as it was increased, theses gases had more frequent collisions within this solution. Causing an increase. The liquid on its own will experience no changes.

Answer:

Increase the amount of gas

Explanation:

The sum of the kinetic and potential energies of a system of objects is conserved only when no external force acts on the objects.

The principle of conservation of mechanical energy states that the total mechanical energy of an isolated system (absence of external force) is always constant.

M.A = P.E + K.E

where;

P.E is potential energy

K.E is kinetic energy

Thus, the sum of the kinetic and potential energies of a system of objects is conserved only when no external force acts on the objects.

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A wide variety of producers, consumers, & decomposers can coexist in the ecosystem.

The variety of all living creatures on our world, known as biodiversity, has been disappearing at an alarming rate in recent years. This is largely due to human activities such changing land use, pollution, and climate change.

All living creatures and their interactions are represented by the term "biodiversity," which is short for biological diversity. Because of extinctions and the emergence of new species, biodiversity is always changing. Three types of diversity—species, genetic, and ecosystem—are frequently mentioned by scientists.

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By focusing a laser on the surface of a asteroid, the intense surface heating from the laser could cause surface material to be ejected into space at high speed due to change in the momentum

Since the surface material is ejected into space at high speed, it has significant momentum. And since the asteroid and all of its component are considered as an isolated system, the total momentum is conserved according to law of conservation of momentum.

So, as the surface material is ejected with momentum, this causes a change in the momentum of the asteroid in the opposite direction. This change reduces the speed of the asteroid gradually decreasing its momentum, or it gives the asteroid a speed in a different direction causing it to be deflected from its path.

The given question is incomplete. The complete question is:

In the past, asteroids striking the earth have produced disastrous results. If we discovered the asteroid on a collision course with the earth, we could, in principle, deflect it and avoid an impact by focusing a laser on the surface. Intense surface heating from the laser could cause surface material to be ejected into space at high speed. How would this deflect the asteroid?

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A seismograph is a device called that uses special weights and magnetic fields to measure the movement of the ground.

A seismograph is a particular device that records seismic waves caused by an earthquake, explosion, or other earth-shaking events. Seismographs have electromagnetic sensors that convert ground motions into electrical changes that are processed and recorded by the instrument's analog or digital circuits.

The terms "seismograph" and "seismometer" are frequently used interchangeably; however, while both devices can detect and measure seismic waves, only a seismograph can record them. A seismogram is a record produced by a seismograph on a display screen or paper printout.

 Although originally designed to detect natural earthquakes, seismographs have a wide range of applications, including petroleum exploration, research into the Earth's crust and lower layers, and monitoring volcanic activity.

Seismographs are devices that record the movement of the ground during an earthquake. They are installed on the ground as part of a seismographic network all over the world. 

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In “The Interlopers”, irony is a key element the author Saki uses to convey the theme that when people hold grudges, the outcome of the feud is often tragic and The dramatic irony is that both men wish to meet the other man face to face with no witnesses around—each man has the wish to kill the other.

What is an irony?

Irony in its broadest sense is the juxtaposition of what appears to be on the surface and what is or is expected to be. It is an important rhetorical and literary technique.

Sarcasm can be divided into several types, such as verbal sarcasm, dramatic sarcasm, and circumstantial sarcasm. Verbal, dramatic, and situational sarcasm are often used to emphasize truthful claims. An ironic form of simile used in sarcasm, and some forms of ritote, are deliberate words that convey the opposite of the truth, deny the opposite of the truth, or grossly and clearly disrespect the facts. May be used to emphasize the importance of a person.

Therefore, In The Interlopers, Irony is a key element for author Saki to convey the theme, and when people hold grudges, the consequences of feuds are often tragic, and the dramatic irony is that both men are shunned by the other. It's about seeing someone face it because they want to see it. Face it with no witnesses around - each person has a desire to kill the other person.

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