How do you solve this system of equations. x+y−z = 0 5.08x − 9.96y = 5.31 9.96y − 14.72z = −10.37?

Answer:

false

Explanation:

Work may be done in positive or negative direction. When a work is done in positive direction, it is called useful work, when work is done in negative direction, it is known as useless work. Any energy associated with friction produces useless work. That is, the work is done in negative direction.

Therefore, thermal energy produced by friction can be used to do work but in negative direction.

The correct option is false.

Answer:

a=0 m/s2

Explanation:

t=3,7 h=13320 s

v=const=71 km/h=19,7222 m/s ( 71*1000 m/2600 s=19,7222222 m/s)

if the speed is constant

a=Δv/Δt

since Δv= 0m/s since the speed is constant...

if the speed would rise from 0 m/s to 19.72222m/s

then a=(19.7222 m/s)/13320 s

a=0.00148 m/s2

A car travels in a straight line for 3.7 h at a constant speed of 71 km/h . what is its acceleration? answer in units of m/s 2

Electronegativity is measured on a relative, dimensionless scale known as the Pauling scale. The scale is based on the ability to attract electrons when forming covalent bonds, with fluorine set at 3.98 and other elements scaled against this value. The Pauling scale is the standard despite the abstract nature of electronegativity.

Electronegativity is measured on a relative scale called the Pauling scale. This scale was developed by Linus Pauling in the 1930s. On the Pauling scale, which is the most commonly used scale for measuring electronegativity, electronegativity is dimensionless and has no unit of measure. Fluorine, the most electronegative element, is set at a value of 3.98. All other elements are assigned values from 0 to 4.0 based on their relative ability to attract a bonding pair of electrons compared to fluorine.

The notion of electronegativity is crucial in understanding the chemical behavior of elements, particularly in the formation of covalent bonds. The higher the electronegativity value of an element, the more strongly it tends to attract bonding electrons. Fluorine's high electronegativity makes it an important reference point against which the electronegativities of other elements are measured.

Since electronegativity is an abstract property and cannot be measured directly, the Pauling scale is based on observable quantities such as the strengths of covalent bonds and molecular dipole moments. Different scales may use various methodologies, but the Pauling scale remains the standard for discussed trends in electronegativity.

To find the average speed of Amil's trip to the outlook, we convert the distance and time units and use the formula Average Speed = Distance / Time. The average speed of Amil's trip is 22.35 meters per second (rounded to the nearest hundredth).

To find the average speed of Amil's trip, we can use the formula:

Average Speed = Distance / Time

Amil drove 25 miles in 30 minutes to get to the outlook. To convert the distance from miles to meters, we use the conversion factor: 1 mile = 1609 meters. So, 25 miles is equal to 25 x 1609 = 40225 meters. To convert the time from minutes to seconds, we multiply 30 minutes by 60 to get 1800 seconds. Now we can calculate the average speed:

Average Speed = 40225 meters / 1800 seconds

Average Speed = 22.35 meters per second (rounded to the nearest hundredth).

Answer: The largest known star in the universe is UY Scuti, a hypergiant with a radius around 1,700 times larger than the sun. And it's not alone in dwarfing Earth's dominant star.

Explanation:

The purpose of biofeedback is to help subjects "control their internal processes".

Biofeedback is a kind of treatment that utilizes sensors joined to your body to gauge key body capacities. Biofeedback is expected to enable you to take in more about how your body functions. This data may assist you with developing better power over certain body capacities and address wellbeing concerns.  

This feedback causes you center around rolling out inconspicuous improvements in your body, for example, loosening up specific muscles, to accomplish the outcomes you need, for example, decreasing agony. Generally, biofeedback enables you to utilize your musings to control your body, frequently to enhance a wellbeing condition or physical performance.

The acceleration of a freely falling object is 20 m/s if the distant planet, a freely falling object gains speed at a steady rate of 20 m/s during each second of fall.

It is defined as the rate of change in linear velocity with respect to time. It is also known as linear acceleration.

It is given that:

on a distant planet, a freely falling object gains speed at a steady rate of 20 m/s during each second of fall.

As we know, from the acceleration the rate of change in linear velocity with respect to time. It is also known as linear acceleration.

The acceleration of an item is the amount of speed it gets or loses per second when only its speed is changing and not its direction.

Thus, the acceleration of a freely falling object is 20 m/s if the distant planet, a freely falling object gains speed at a steady rate of 20 m/s during each second of fall.

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Answer:  13.3 m

I got it right on Acellus

Astronauts orbiting earth experience a fraction smaller gravitational force (Fgrav) as compared to the force on Earth's surface. They are in a state of continuous freefall which gives the impression of weightlessness, not because gravity is absent.

The force experienced by astronauts orbiting the Earth, notably, is actually a fraction smaller than the gravitational force (Fgrav) experienced on Earth's surface. However, it is a common misunderstanding that astronauts in orbit experience zero gravity. Though it might appear they are weightless and therefore not subject to gravity, this is not the case. They are in a state of continuous freefall towards the Earth. The sensation of weightlessness is because they're in freefall, not because gravity is absent. The effect of gravity diminishes as distance from the Earth increases, hence why the gravitational force is a fraction smaller.

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Answer:

1250 SQUARE YARDS

Explanation:

The area of the soccer field given the data from the question is 1250 yard²

Area = Length × Width

Area = Length × Width

Area = 50 × 25

Area = 1250 yard²

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The momentum of the large rock that has a mass of 50kg and is rolling downhill at 3 m/s is 150kgm/s.

HOW TO CALCULATE MOMENTUM:

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Galaxy is "all-encompassing" of the other words given so it doesn't belong.

A galaxy is a collection of stars, stellar remnants, interstellar gas, dust, and dark matter that is gravitationally bound. The name comes from the Greek word galaxias, which translates to mean "milky" and refers to the Milky Way galaxy, which houses the Solar System.

Given in the question  word doesn't belong: planet, galaxy, sun, moon

So, we can see "galaxy" is "all-encompassing" of the other words given, so it does not belong.

Galaxy is "all-encompassing" of the other words given so it doesn't belong.

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Answer:

The answer would be The number of protons and neutrons

Neutrons and protons cannot be removed from nucleus from chemical reactions because they are strongly held together but nuclear reactions are strong enough to separate them

Explanation:

Nuclear reactions involve a change in the nucleus of an atom, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei

The force that will make this into equilibrium would be equal to the force of equal amount yet applied on the opposite direction.

So we are given that a force of 55 N due west was applied, so the equilibrium force would be 55 N due east.

Final answer:

To achieve equilibrium against a 55 N force acting due west, a single equal and opposite force of 55 N must be applied due east. In various scenarios, the equilibrium force must have the same magnitude but opposite direction to the acting force. Pythagorean theorem helps calculate net force when forces are perpendicular.

Explanation:

For an object to be in equilibrium, the net force acting on it must be zero. This means that to counteract a force of 55 N acting due west, an equal and opposite force must be applied. The single force that would produce equilibrium in this case is a 55 N force acting due east.

Applying this principle, we can understand the scenarios presented:

Lastly, a charge in an electric field experiencing a net force of 100 N eastward when the field points north is impossible, since the electric force on a charge by a field is in the direction of the field. Therefore, the force must be perpendicular to the direction of the electric field strength of 50 N/C pointing north.

Answer:

D. The net force is zero, so the acceleration is zero

Explanation:

In a simple harmonic motion, velocity and acceleration are out-of-phase as follows:

- When the displacement is zero (so, when the spring is in equilibrium position), the acceleration is zero, because the force is zero. In fact, the force is given by Hook's law:

[tex]F=-kx[/tex]

So, when x=0, F=0, and the acceleration is also zero according to Newton's second law:

[tex]a=\frac{F}{m}=0[/tex]

Instead, the velocity is maximum. In fact, the total mechanical energy (sum of kinetic and elastic potential energy) is constant, and since the elastic potential energy:

[tex]U=\frac{1}{2}kx^2[/tex]

is zero at x=0, this means that the kinetic energy is maximum. But the kinetic energy is

[tex]K=\frac{1}{2}mv^2[/tex]

and so, the velocity is also maximum.

- When the displacement is maximum, it is the opposite: the acceleration is maximum (because x is maximum, so the force is maximum), while the velocity is zero, because the elastic potential energy is maximum and so the kinetic energy is zero).

At point D, we are in the first situation (the spring is passing its position of equilibrium, so x=0), therefore the net force is zero and the acceleration is zero.

Answer:

D: The net force is zero, so the acceleration is zero

Explanation:

The object that provides an inertial frame of reference is the skydiver falling at terminal velocity, as it is a scenario where the object moves at constant velocity with no net external force acting upon it.

An inertial frame of reference is defined as a reference frame in which an object either remains at rest or moves at a constant velocity, provided no external forces are acting upon it. Among the options given, the skydiver falling at terminal velocity provides an inertial frame of reference. Terminal velocity is a constant speed reached by an object when the drag force from the air resistance is equal to the force of gravity, causing no net force on the skydiver and thus no acceleration. The other objects are either accelerating or experiencing changing velocities which disqualify them as inertial reference frames.

Answer:

The standard unit used to measure of mass is gram.

(2) is correct option.

Explanation:

S.I is the standard international system of unit.

The S.I unit of mass is kilogram.

1 kg = 1000 gm

So, We can say that,

The standard unit used to measure mass is gram.

Cubic meter is the unit of volume.

Liter is the unit of water.

Meter is the unit of length.

Hence,  The standard unit used to measure of mass is gram.

The final potential difference across the capacitor after delivering 40% of its stored energy to a lamp is approximately 9.49V.

The question asked is related to the energy stored in a capacitor and its link to the potential difference across it. The energy stored in a capacitor is given by the relation Uc = CV²/2, where C is the capacitance and V is the potential difference. When a capacitor delivers 40% of its stored energy to a lamp, this means a reduction in the stored energy and therefore a corresponding reduction in potential difference as well.

As the stored energy is directly proportional to the square of the potential difference, if the energy reduces to 60% (after delivering 40%), the final potential difference will be the square root of this fraction (sqrt(0.6)) times the initial potential difference. The final potential difference across the capacitor will therefore be sqrt(0.6) * 12V, which is approximately 9.49V.

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