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please helppppppp

Answer:

1: Because matter has many different forms.

2: The materials that are shown can be organized into 3 different forms; solid, liquid, and gas.

3: The image of the liquids is most likely a material that cannot be found in nature. Liquids have many useful properties, but it depends on the liquid. Bleach is a liquid that has is very useful for sterilizing. Water is useful because without it, life on earth would not exist. And there are many more liquids, but I am going to cut it short here because there too many to put down.

Explanation:

Pls mark Brainliest with the crown.

Answer:

 In places of hot climate, it is advised that the outer walls of house be painted white because white color does not absorb any heat radiation from the sun which keep inside cool even if there is hot climate outside the house.

Explanation:

1. Average Speed formula is

\(s = \frac{d}{t} \)

As the distance increases, and the time remains constant, thr speed increases as well

2. Forces cause object to speed up or slow down by extering a greater force on a object than its force that opposes it. For example, if a person is running. The pushing force ( the person using their legs to run) is greater than the friction force. which is from the ground.

The efficiency of the turbine is 50%.

The given parameters:

The kinetic energy of the turbine which is the input energy is calculated as follows;

E(in) = 3000 - (750 + 750)

E(in) = 1500 J

The efficiency of the turbine is calculated as follows;

\(E_f_f = \frac{E_{(out)}}{E_{(in)}} \times 100\%\\\\E_f_f = \frac{750}{1500} \times 100\%\\\\E_f_f = 50 \%\)

Thus, the efficiency of the turbine is 50%.

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Answer:

its b

Explanation:

Answer: (C)

Explanation:  (B) is the weight of the box acting downwards

(A) is the frictional force acting on the box because of moving forward against the plane

(D) is the force that moves the box forward

( C) is perpendicular to the box which means it is at 90 degrees with the box. Normal usually means at 90 degrees

Answer:

This all simply due to the size of the two water bodies question and the your body size in a bath tub the water is small enough to allow the upthrust displace water out if the tub whereas in a lake the water is bigger and your body size is smaller to allow any noticeable upthrust that would cause an overflow

Statement:

A non-deformed spring is 15 cm long. When a 2.0 N force is applied to it, its length becomes 19 cm.

To find out:

The spring constant of the spring.

Solution:

Answer:

The spring constant of this spring is 50 N/m.

Hope you could understand.

If you have any query, feel free to ask.

Antonio will need a pipette to measure 15 ml of distilled water in a laboratory.

A pipette is a laboratory equipment used in measuring liquids in little amounts. 15 ml is a small amount of liquid so a pipette is a better fit for such amount.

We can conclude that a pipette is a better instrument to measure 15 ml of distilled water.

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To ensure the uniqueness of values in a nonprimary key column , use the Create Unique Index command to create an index.

The ratio of the speed of light in a vacuum (c) to the speed of light in a medium (c') is known as the index of refraction (n). The propagation vector in the new medium has a different angle with respect to the normal as a result of this difference in speed when light travels from one medium to another at an angle.

The average value of units that are not homogeneous and may therefore be impacted by changes in the mix of items as well as by changes in their prices are measured by a unit value index, which is a "price" index.

Refractive index, commonly known as the index of refraction, is a measurement of how much a light beam bends when it passes through one medium and into another.

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To solve this problem, we can use the concept of related rates. We are given that the distance s between the airplane and the radar station is decreasing at a rate of 400 km per hour when s = 10 km. We need to find the horizontal speed of the plane.

Let's denote the horizontal speed of the plane as v. Since the plane is flying at a constant height of 6 km above the ground, we can consider a right triangle formed by the airplane, the radar station, and the ground. The distance between the airplane and the radar station is the hypotenuse of this triangle, and the height of the triangle is 6 km.

Using the Pythagorean theorem, we have:

s^2 = (v^2) + (6^2)

Differentiating both sides of the equation with respect to time t, we get:

2s(ds/dt) = 2v(dv/dt)

Since ds/dt is the rate at which the distance s is changing (given as -400 km/h) and s = 10 km, we can substitute these values into the equation:

2(10)(-400) = 2v(dv/dt)

Simplifying further:

-8000 = 2v(dv/dt)

Now, we need to find the value of dv/dt, which represents the rate at which the horizontal speed of the plane is changing. Rearranging the equation, we have:

dv/dt = -8000 / (2v)

Given that s = 10 km, we can substitute this value into the equation for v:

10 = (v^2) + (6^2)

10 = v^2 + 36

v^2 = 10 - 36

v^2 = -26

Since we are dealing with speeds, we can discard the negative value. Therefore, the horizontal speed of the plane is v = √26 km/h (approximately 5.1 km/h).

according to the question mention above, the horizontal speed of the plane is approximately 833.3 km/h.

We can start by using the formula:
s^2 = d^2 + h^2
where s is the distance between the airplane and the radar station, d is the horizontal distance between them, and h is the height of the airplane.
Taking the deriviative with respect to time, we get:
2s ds/dt = 2d dd/dt
Since the airplane is flying at a constant height, we know that dh/dt = 0. Therefore, we can simplify the equation to:
ds/dt = -(d/s) dd/dt
Substituting the given values, we have:
s = 10 km
ds/dt = -400 km/h
h = 6 km
Solving for d, we get:
d = sqrt(s^2 - h^2) = sqrt(10^2 - 6^2) km ≈ 8 km
Substituting into the equation for ds/dt, we have:
-400 km/h = -(8 km/10 km) dd/dt
Simplifying, we get:
dd/dt = 500 km/h
Therefore, the horizontal speed of the plane is:
d/dt = dd/dt / cos(theta)
where theta is the angle between the horizontal distance and the line of sight between the airplane and the radar station. Since the airplane is flying towards the radar station, we can assume that theta is small and approximately equal to the angle of depression. Therefore:
cos(theta) ≈ h/s = 6 km / 10 km = 0.6
Substituting, we get:
d/dt = 500 km/h / 0.6 ≈ 833.3 km/h
Therefore, the horizontal speed of the plane is approximately 833.3 km/h.

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Electrons are one of the constituents of atoms. It is negatively charged particles and the atom has the same number of protons and electrons.

Matter is made up of atoms. Atoms are made up of protons, electrons, and neutrons. The protons are positively charged particles, electrons are negatively charged particles, and neutrons are neutrally charged particles. Protons and neutrons are present inside the atoms from the nucleus. The electrons are revolving around the nucleus due to attractive force.

The characteristics of the electrons are: Electrons are identified by J.J Thomson by using cathode rays. The electrons are negatively charged particles. The mass of an electron is 9.11×10⁻³¹Kg and the charge of an electron is 1.6×10⁻¹⁹C. They are the fundamental block of all atoms. Cathode beams are the source of electrons.

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Answer:

Volume = 112cm^2

Density = 0.45 g/cm^2 (2.s.f)

Explanation:

Volume of a cube is found by multiplying its height by its length by its width.

We are given the values: l = 7cm, w = 8cm, h = 2cm, so to find the volume we just need to multiply them all together:

V=lwh

V = (7)(8)(2)

The volume of the cube = 112cm^2

Density is found by dividing mass by volume.

We are given the mass (50 grams) and we have just found the Volume (112cm^2), so we can just divide them to find the density:

p (symbol for density) = m/v

p = (50)(112)

The density of the cube is 0.45 g/cm^2 (2.s.f.)

Hope this helped!

The work-energy theorem is a fundamental principle in physics that relates the work done on an object to its change in kinetic energy.

The theorem states that the net work done on an object is equal to its change in kinetic energy:

Net Work = Change in Kinetic Energy

In other words, the work-energy theorem tells us that the work done on an object is equal to the change in its kinetic energy. If work is done on an object, its kinetic energy will change by an amount equal to the work done. Conversely, if the kinetic energy of an object changes, it must be due to work being done on the object.

The work-energy theorem applies to both conservative and non-conservative forces. For conservative forces, the work done depends only on the initial and final positions of the object, and not on the path taken between them.

For non-conservative forces, such as friction, the work done depends on the path taken and may result in a loss of mechanical energy.

The work-energy theorem is a powerful tool for analyzing and solving problems in physics, and it is widely used in many fields, including mechanics, thermodynamics, and electromagnetism.

It allows us to relate the work done on an object to its resulting motion and energy changes, providing a comprehensive picture of the physical system under consideration.

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9 × 10²¹ electrons flow through a cross section of the wire in one hour.

= 1440 C

= 9 × 10²¹ electrons

Thus, we can conclude that the 9 × 10²¹ electrons flow through a cross section of the wire in one hour.

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An objects potential energy is due to its state of rest.

Define potential energy

Potential energy is a form of accumulated energy that is dependent on the relationship between different system components. When a spring is compressed or expanded, its potential energy increases. The potential energy of a steel ball is greater when it is raised above the earth than when it is brought to Earth.

Energy that is conserved or kept in a substance or object is known as potential energy. The position, arrangement, or condition of the item or substance determines the amount of stored energy. It can be pictured as energy with the "potential" to perform labor. Mechanical energy, electrical energy, chemical energy, radiant energy, nuclear energy, and heat energy are the six categories of potential energy.

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The star is moving away from Earth at a velocity of 1.8 x 106 m/s.

The Doppler Effect describes the shift in wavelength of a wave when the source is moving in relation to the observer. The shift can be observed in sound waves, light waves, and other waves.

The Doppler Effect can be used to determine the velocity of objects moving away from an observer, as in the case of stars moving away from Earth.

The velocity of a star moving away from Earth can be determined using the equation:

v = Δλ/λ x c, Where v is the velocity of the star, Δλ is the shift in wavelength of the spectral line, λ is the wavelength of the spectral line measured in the lab on Earth, and c is the speed of light (3.00 x 108 m/s).

In this case, the shift in wavelength of the spectral line is Δλ = 500.3 nm - 500 nm = 0.3 nm.

The wavelength of the spectral line measured in the lab on Earth is λ = 500 nm.

Plugging in these values to the equation above: v = Δλ/λ x cv = (0.3 nm / 500 nm) x (3.00 x 108 m/s) = 1.8 x 106 m/s.

Therefore, velocity of star 1.8 x 106 m/s.

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Civilian los activities are often carried out on the9.15  mhz, 2.45 ghz, or 5.8ghz radio frequencies.

The oscillation rate of an alternating electric current or voltage, or of a magnetic, electric, or electromagnetic field, or of a mechanical system in the frequency range of roughly 20 kHz to around 300 GHz, is referred to as radio frequency (RF). This is about between the upper and lower limits of audio and infrared frequencies; these are the frequencies at which energy from an oscillating current may radiate into space as radio waves. Different sources offer different upper and lower frequency limitations.

The flow of electricity

Electric currents that oscillate at radio frequencies (RF currents) have particular features not shared by direct current or lower audio frequency alternating current, such as the 50 or 60 Hz current utilized in electrical power distribution. RF currents in conductors can radiate energy into space as electromagnetic waves (radio waves). This is the fundamental principle of radio technology.

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Virginia is officially called as Commonwealth of Virginia. It is a state in the Mid-Atlantic and South-eastern regions of the United States between the Atlantic Coast and the Appalachian Mountains.

Commonwealth countries just like other countries have independent Foreign policies, Defence policies, or political policies. They put themself in the commonwealth because in past they are the colony of any other country. But the country can leave the commonwealth group.

The statement that describes the paleontology of the states are :

a. variety of historical eras are represented by the rocks in Virginia.

b. A sea once engulfed Virginia.

c. The Allegheny Plateau includes coal deposits.

d. In the past, the state's weather was warm and muggy, resembling a tropical rainforest.

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When the distance between the charged parallel plates of a capacitor is halved from d to d/2, the potential difference across the plates will remain the same.

The potential difference (V) across the plates of a capacitor is directly proportional to the electric field (E) between the plates and the distance (d) between them. Mathematically, V = Ed.

When the distance between the plates is halved to d/2, the electric field between the plates will double in magnitude. This is because the electric field is inversely proportional to the distance between the plates. Thus, E' = 2E.

Now, let's consider the potential difference across the plates when the distance is halved. Since V = Ed, the new potential difference V' can be calculated as V' = E'd/2. Substituting the values, we get V' = (2E)(d/2) = Ed = V.

From the equation, we can observe that the potential difference V' across the plates remains the same as the initial potential difference V. Therefore, when the distance between the charged parallel plates of a capacitor is decreased to d/2, the potential difference across the plates will remain unchanged.

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A) The motor can do 18,000 joules of work in 12 seconds. B) The motor can lift the 131 kg bundle of shingles to a height of approximately 13.43 meters in 12 seconds.

A. To calculate the work done by the motor, we can use the formula:

Work = Power × Time

Given that the power output of the motor is 1.5 kW (1500 W) and the time is 12 seconds, we can substitute these values into the formula:

Work = 1500 W × 12 s = 18,000 J

B. To determine how high the motor can lift a 131 kg bundle of shingles, we need to consider the gravitational potential energy associated with raising the bundle. The formula for gravitational potential energy is:

Potential Energy = Mass × Gravity × Height

In this case, the mass is 131 kg and gravity is approximately 9.8 m/s². We need to find the height, so we rearrange the formula:

Height = Potential Energy / (Mass × Gravity)

Since the work done by the motor is equal to the potential energy gained by the bundle, we can substitute the work (18,000 J) into the formula:

Height = 18,000 J / (131 kg × 9.8 m/s²) ≈ 13.43 m

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Answer:

A switch interrupts the flow of current in a circuit.

Explanation:

Ocean drilling cores have been used to confirm the age of the oldest oceanic crust, which was formed about missing years ago.

An electric charge, an electric current, and magnetic materials are all affected magnetically by a magnetic field, which is a vector field. A force perpendicular to the magnetic field and its own velocity acts on a moving charge in a magnetic field.

Because it shields the planet from dangerous radiations such solar winds, which have high radiation levels, the magnetic field of the Earth is crucial. The sun's solar energy includes solar winds.

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If the following forces act on an object: 20 N North, 50 N South, and 40 N west, then the magnitude of the net force would be 50 Newtons.

The quantities that contain the magnitude of the quantities along with the direction are known as the vector quantities.

Examples of vector quantities are displacement, velocity acceleration, force, etc.

As given in the problem if the following forces act on an object: 20 N North, 50 N South, and 40 N west.

The net force = √ ( 30² + 40² )

                      = 50 Newtons

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Answer:

The distance covered is 5250 meters

Explanation:

Motion With Constant Acceleration

It's a type of motion in which the velocity of an object changes uniformly in time.

The change of velocities is given by the following equation :

\(v_f=v_o+at\qquad\qquad [1]\)

Where:

a   = acceleration

vo = initial speed

vf  = final speed

t    = time

The distance traveled by the object is given by:

\(\displaystyle x=v_o.t+\frac{a.t^2}{2}\qquad\qquad [2]\)

Solving [1] for a:

\(\displaystyle a=\frac{v_f-v_o}{t}\)

The car changes its speed from vo=54 Km/h to vf=72 Km/h in t=5 minutes. Let's convert all to meters and seconds.

vo=54 Km/h * 1000/3600 = 15 m/s

vf=72 Km/h * 1000/3600 = 20 m/s

t = 5 min * 60 = 300 s

Now we calculate the acceleration:

\(\displaystyle a=\frac{20-15}{300}\)

\(\displaystyle a=\frac{5}{300}\)

\(a=0.0167\ m/s^2\)

Now for the distance:

\(\displaystyle x=15*300+\frac{0.0167*300^2}{2}\)

\(\displaystyle x=4500+750=5250\)

x = 5250 m

Note: We have shown only some of the decimals for the acceleration, but we have used all the decimals stored in the calculator to present accurate results.

The distance covered is 5250 meters

Answer:

There are 4

Explanation:

D. Two substances must combine chemically.

One type of atom makes up an element, which is a white crystalline solid that cannot be divided into more than one component. Compounds are pure substances created by mixing two or more substances in a specific mass ratio.

Chemically pure substances that can be found in nature are called elements and compounds. An component is an object made of the same kinds of atoms as a compound, which is how they differ from one another.

It is common for the disorder to develop and the entropy of the system to increase as a result of the dispersion of molecules, atoms, and ions of one sort during the creation of a solution throughout a second substance.

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Answer:

TOWARD the North pole.

Explanation: