A sample of matter, either a single element or a single compound, that has definite chemical and physical properties.

Answer:

4..... the answer is 4

Explanation:

Rotation speed of the space station so that the outermost points have an acceleration equal to 'g' = 2.55 rpm

What is Rotation speed ?

The rate at which the Aeroplan should begin rotating into takeoff attitude is known as V r.

V r, the rotational speed, cannot be lower than V1. A subsequent rejected takeoff may not be achievable within the remaining runway length and is likely to result in a Runway Excursion if it is more than V1 and it is discovered that, at V r, rotation cannot be completed.

V r depends on the weight of the aircraft and the flap position, but it can also change according on temperature, pressure, and altitude.

Gravitational acceleration = g = 9.8 m/s2

Diameter of the space station = D = 275 m

Radius of the space station = R

R = D/2

R = 275/2

R = 137.5 m

Angular speed of the space station = \(\omega (rad/s\))

Centripetal acceleration at the outermost points = ac = g = 9.8 m/s2

ac = \(\omega2R\\\)

9.8 =\(\omega2(137.5)\)

\(\omega \\\)= 0.267 rad/s

Converting from rad/s to rpm,   (1 revolution = \(2\pi radians\) , 1 minute = 60 seconds)

\omega = 0.267 \(\times (\frac{60}{2\pi })\)

\omega = 2.55 rpm

Rotation speed of the space station so that the outermost points have an acceleration equal to 'g' = 2.55 rpm

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The transfer of warmth (heat) from one item to another is known as heat conduction. Therefore, we can witness heat or thermal conduction when two things with differing temperatures come into touch.

Thus, The heat transfers from the hotter (the cup) to the colder (our hands) object when we contact the hot cup. When we added hot water to the cup that was at normal temperature, thermal conduction also took place.

The object's temperature is actually a measurement of how quickly its atoms are moving. The total energy produced by the atoms' vibrations is measured by the heat.

As a result, the atoms inside it begin to travel more quickly, which inevitably raises the likelihood that they will collide and conduction. It also relies on the density of the material we are working with how much they will clash.

Thus, The transfer of warmth (heat) from one item to another is known as heat conduction. Therefore, we can witness heat or thermal conduction when two things with differing temperatures come into touch.

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To calculate the magnitude of the acceleration of the sofa in units of m/s2, we need to use Newton's Second Law of Motion, which states that the force acting on an object is equal to the mass of the object times its acceleration, F = ma.

We also need to account for the force of friction, which opposes the motion of the sofa and is equal to the coefficient of kinetic friction times the normal force, or Ff = μkFN.

Since the sofa is sliding across a horizontal floor, the normal force is equal to the weight of the sofa, or FN = mg. Therefore, the force of friction is Ff = μkmg.

Now we can plug in the given values and solve for the acceleration of the sofa:

F - Ff = ma

486.99 N - (0.23)(83.47 kg)(9.8 m/s2) = (83.47 kg)a

Solving for a, we get:

a = (486.99 N - (0.23)(83.47 kg)(9.8 m/s2))/(83.47 kg)

a = 3.82 m/s2

Rounding to two decimal places, the magnitude of the acceleration of the sofa is 3.82 m/s2.

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Answer:

To increase the volume of moving water, impoundments or dams are used to collect the water. An opening in the dam uses gravity to drop water down a pipe called a penstock. The moving water causes the turbine to spin, which causes magnets inside a generator to rotate and create electricity.

Explanation:

The state of equilibrium refers to a condition in which an object or system is balanced, with no net external forces or torques acting upon it. In other words, the object or system remains at rest or continues its motion in a straight line at a constant velocity. There are two types of equilibrium: static equilibrium and dynamic equilibrium.

1. Static Equilibrium:

Static equilibrium occurs when an object is at rest and all the forces acting on it are balanced. This means that the net force and net torque on the object are both zero. An example of static equilibrium is a book sitting on a flat table. The weight of the book is balanced by the normal force exerted by the table, and there is no motion.

2. Dynamic Equilibrium:

Dynamic equilibrium occurs when an object is in motion with a constant velocity, and the net force and net torque on the object are zero. In this case, the object experiences balanced forces that result in uniform motion. An example of dynamic equilibrium is a car traveling at a constant speed on a straight road. The driving force applied by the engine is balanced by the resistive forces such as air resistance and friction, allowing the car to maintain a constant velocity.

It's important to note that equilibrium does not necessarily mean that all forces are zero, but rather that the sum of forces and torques acting on the object add up to zero. Equilibrium is a state of balance where there is no change in motion or rotation.

In summary, the state of equilibrium refers to a balanced condition in which the forces and torques acting on an object or system are balanced, resulting in either static or dynamic equilibrium. Examples of equilibrium include a book resting on a table in static equilibrium and a car traveling at a constant speed in dynamic equilibrium.

Answer:

dynamic equilibrium and static equilibrium are the 2 types of equilibrium

The gradient at B is zero because the rocket's velocity changes from positive to zero, and the shaded areas above and below the time axis are equal. If the rocket opens a parachute at B, its speed decreases gradually until it reaches the ground.

(a) (i) The gradient of the graph at B is zero.

(ii) The gradient has this value at B because the velocity of the rocket is changing from positive (upward) to zero at its maximum height.

The shaded areas above and below the time axis are equal. The area above the time axis represents the increase in the rocket's potential energy as it gains height, while the area below the time axis represents the decrease in its kinetic energy due to air resistance.

If the rocket opens a parachute at point B, its speed will decrease gradually until it reaches the ground.

The speed-time graph of the rocket with the parachute will show a shallow slope, indicating a gradual decrease in speed over time. This slope will become steeper as the rocket approaches the ground, until it reaches a speed of zero at E.

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Answer:

They both act between two bodies without any means of contact. However gravitational force acts on mass while the electric force acts on charge. Gravitational force are only attractive while electric field can be attractive/repulsive. Electric field is much stronger than gravitational field.

Explanation:

Answer:

ų=0.8

Explanation:

F=mg

F=4×9.81=39.24N

Ff=Fn-F

=39.24-8=31.24

ų=Ff÷Fn

=31.24÷39.24

=0.8

The lux level at the brightest point on the poster is 18.3 lx.

This is a very low value and is not a suitable level. The lighting level of the classroom should be at least 300 lx. Using spot lighting in a classroom to provide lighting to desks has several issues such as: Since spotlights have a narrow beam angle, they only provide light to a small area.

This is not ideal for classrooms since all the desks need to be adequately lit. Students may experience glare from the light source if they are looking directly at it. This can cause discomfort and lead to eye strain and headaches. Spot lighting can create shadows, making it difficult for students to see what they are working on.

Shadows can also create a sense of insecurity for some students and may impact their learning.The uniformity of the lighting may be affected since the lighting is only focused on certain areas. As a result, some parts of the classroom may be too dark, while others may be too bright.

This can cause distractions and make it difficult for students to concentrate.

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Answer:

2730.304 KJ

Explanation:

 How much heat is required to convert 0.8 kg of ice at  -35°C into steam at 100 C?

Given that:

mass of ice (m) = 0.8 kg = 800 g

Initial temperature (\(T_i\)) = -35°C = 238 K

final temperature (\(T_n\))= 100°C = 373 K

Specific heat of ice (\(S_i\)) = 2.108 J/g.K

Specific heat of water (\(S_w\)) = 4.18 J/g.K

Latent heat of fusion (\(L_f\)) = 334 J/g.

Latent heat of vaporization (\(L_v\)) = 2230 J/g.

\(\Delta T=T_n-T_i=373-238=135K\)

Total heat (Q) required to increase the temperature of ice from the initial temperature of 238K to final temperature of 373 K is given by the equation:

\(Q=m\Delta TS_i+m\Delta TS_w+mL_f+mL_v\\Q=800(135)*2.108+800(135)*4.18+800*334+800*2230\\Q=227664+451440+267200+1784000=2730304J\\Q=2703.304KJ\)

Answer:

The answer is going to be ZERO

Explanation:

Let's find relationship

Apply Newton's second law

\(\\ \rm\Rrightarrow F=ma\)

\(\\ \rm\Rrightarrow Force\propto mass\)

The graph will be a straight line passing through origin so y intercept is 0

Answer:

I think 3 options are correct

The speed of a wave is dependant on three factors: wavelength, frequency, medium..

Hope it helpz~

Answer:

wavelength, frequency, medium

Explanation:

amplitude is the only one not correct.

please rate 5 star and give brainlest :)

A serial killer is one that goes on from one place to another killing people everywhere.

The information about a serial killer that is documented are;

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For most everyday objects, scientists use a balance to obtain an object's mass. A balance compares an object with a known mass to the object in question. One example of a balance is the triple beam balance.

Power can be defined as the rate at which work is accomplished.

Option D is the correct answer.

The work done by an object in a given time interval is called the power of that object.

Suppose an external force F is applied to any object for the time interval T seconds. Due to this external force, the object will perform some amount of work for the time T seconds. This work W done by the object for the time interval T seconds is called the power of that object.

Power can be defined in mathematical term which is given below.

\(P = \dfrac {W}{T} \;\rm Watts\)

Thus the power can also be defined as the work done by the object per unit time interval.

Hence we can conclude that option D is the correct answer.

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Far does the jet go while accelerating = 95.2m and force catapult have to exert on jet is 4.42*105 N.

(measured in metres)

Use the formula xf = xi + v0*t+(1/2)*a*t2 The initial velocity and location are both zero! xf = 0+0+(1/2) xf = (1/2)*(68 m/s - 0 m/s)*(1/2.8s)*(2.8s)2 = 95.2 m

How much force does the catapult have to exert on the jet?

(N) Because F = m*a and Force = mass*acceleration, F = (18,200 kg)*(68 m/s - 0 m/s)*(1/2.8s) = 4.42*105 N.

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Once the atomic number of an atom is known, the number of electrons can be deduced depending on if the atom is an ion or a neutral one.

The atomic number of an atom is the number of protons in the nucleus of the atom.

For atoms that are neutral, that is, no net charges, the number of protons is always equal to the number of electrons. In other words, the positive charges always balance the negative charges in neutral atoms.

Thus, if the atomic number of a neutral atom is 6, for example, the proton number will also be 6. Since the proton must balance the electron, the number of electrons will also be 6.

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The magnitude of the net force on the truck is 2070.5 N.

Frictional force is the force that opposes motion or attempted motion between two surfaces in contact. It arises as a result of the interlocking of irregularities on the surfaces in contact, and it acts in the direction opposite to the direction of motion or attempted motion.

Frictional force can be classified into two types: static friction and kinetic friction. Static friction is the force that prevents an object from moving when a force is applied to it, while kinetic friction is the force that opposes the motion of an object that is already in motion.

The normal force is equal to the weight of the truck, which can be calculated as:

weight = mass x gravity

where gravity is approximately 9.81 m/s^2.

So the weight of the truck is:

weight = 900 kg x 9.81 m/s^2 = 8829 N

Therefore, the normal force is:

normal force = weight = 8829 N

And the frictional force is:

frictional force = 0.5 x 8829 N = 4414.5 N

Next, we can find the net force on the truck by subtracting the force of friction from the force exerted by the car:

net force = 2345 N - 4414.5 N = -2070.5 N

Note that the negative sign indicates that the net force is in the opposite direction to the force exerted by the car, which makes sense since the truck is slowing down.

Finally, we can use Newton's second law to find the acceleration of the truck:

net force = mass x acceleration

-2070.5 N = 900 kg x acceleration

acceleration = -2.3 m/s^2

Again, the negative sign indicates that the truck is slowing down.

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The current is the same throughout all components in the circuit because the current has only one path to follow in a series circuit.

Mathematically, we can use Ohm's law to explain this phenomenon.  In a series circuit, since the components are connected in a line, the current must be the same through each component. Therefore, the voltage drop across each component must be directly proportional to its resistance, according to Ohm's law. Since the resistance of each component is different, the voltage drop across each component will be different but the current through each component will be the same.

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Because the current flowing through both bulbs in a series connection is equal, the power P = I2R states that the 60W bulb will expend more power and so be brighter than the 40W bulb (100W bulb).

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Answer:

λ = 5.85 x 10⁻⁷ m = 585 nm

f = 5.13 x 10¹⁴ Hz

Explanation:

We will use Young's Double Slit Experiment's Formula here:

\(Y = \frac{\lambda L}{d}\\\\\lambda = \frac{Yd}{L}\)

where,

λ = wavelength = ?

Y = Fringe Spacing = 6.5 cm = 0.065 m

d = slit separation = 0.048 mm = 4.8 x 10⁻⁵ m

L = screen distance = 5 m

Therefore,

\(\lambda = \frac{(0.065\ m)(4.8\ x\ 10^{-5}\ m)}{5\ m}\)

λ = 5.85 x 10⁻⁷ m = 585 nm

Now, the frequency can be given as:

\(f = \frac{c}{\lambda}\)

where,

f = frequency = ?

c = speed of light = 3 x 10⁸ m/s

Therefore,

\(f = \frac{3\ x\ 10^8\ m/s}{5.85\ x\ 10^{-7}\ m}\\\\\)

f = 5.13 x 10¹⁴ Hz

Yes, light is simply a small segment of the electromagnetic spectrum. It is the part that our eyes can detect and perceive as visible light.

Light is a form of electromagnetic radiation, which is a type of energy that travels in waves. The electromagnetic spectrum is a range of all possible frequencies of electromagnetic radiation, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Each type of electromagnetic radiation has a different wavelength and frequency.

Visible light is the portion of the electromagnetic spectrum that is visible to the human eye. It consists of different colors ranging from red to violet. When we see an object, it is because light reflects off the object and enters our eyes. This reflected light is made up of different colors, and our eyes perceive them as different shades and hues.

So, yes, light is simply a small segment of the electromagnetic spectrum. It is the part that our eyes can detect and perceive as visible light.

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Yes, light is simply a small segment of the electromagnetic spectrum. To get a long answer, let us define electromagnetic spectrum and light.Electromagnetic Spectrum This is the range of all electromagnetic radiation.

Electromagnetic radiation is energy that travels in the form of waves. They include microwaves, X-rays, gamma rays, visible light, radio waves, and others. These waves do not require a medium to travel and can move through a vacuum. They all travel at the speed of light and have different wavelengths and frequencies.LightLight is a form of electromagnetic radiation with a wavelength between 400 and 700 nm. The color of the light depends on the wavelength. Violet light has the shortest wavelength, while red light has the longest wavelength. When light passes through a prism, it splits into different colors due to the different wavelengths of the colors.

Light is a tiny section of the electromagnetic spectrum. It is located between ultraviolet radiation and infrared radiation. Electromagnetic radiation is classified based on its wavelength and frequency. As a result, the electromagnetic spectrum is divided into various areas, each with its own unique properties, ranging from short wavelength and high-frequency radiation to long wavelength and low-frequency radiation. Light is only a tiny portion of the spectrum, as previously mentioned. It falls within the visible spectrum, which ranges from 400 to 700 nm. This region includes all of the colors we can see with our eyes. The other parts of the electromagnetic spectrum are not visible to our eyes and must be detected with specialized equipment.

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The distance and velocity of one of the galaxies, the universe "started its trip about 17.23 billion years.

A galaxy redshift = 0.228

velocity = redshift × speed of light

= 0.228 × 3 × 10⁸m/s

velocity = 6.84 × 10⁷ m/s

Distance = 1050 × 3.2 × 10⁶ light years

= 1050 × 3.2 × 10⁶× 9.46 × 10¹⁵ m

= 3.17856 × 10²⁵ m

So,

Age = D/v

= 5.436 × 10¹⁷ sec

1 sec = 3.17 × 10¹⁷ sec

Age = 5.436 × 10¹⁷ × 3.17 × 10¹⁷ sec

= 17.23 billion years

Thus, according to the relationship between distance and velocity, the universe started its trip about 17.23 billion years.

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The description of Xenilia. The following simile is used by the narrator of Iliad 22 to describe a character that Priam observes as he surveys the battlefield from the walls of Troy.

The original Troy village was surrounded by stone walls that had been strengthened numerous times. Because the walls were built on bedrock, no traces of human occupation can be found below them. There has always been a meters-wide southern gate on this section of the fortifications. The walls of the agreement are gently slanted inward.

Like we can see, each of these walls is designed to provide security, but each one also serves a different purpose for a great hero, as Achilles and Hector, among others, are compared to.

Troy's archaeological site contains magnificent fortress walls that are up to 8 meters high and 5 meters thick, built from enormous limestone blocks. Troy VI is the era that is currently most apparent at the site and is the most likely candidate for the besieged city in Homer's Trojan War.

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Answer:

study of everything that helps to improve the home and the family

Explanation:

Answer:

➢ Home economics, or family and consumer sciences, is a subject concerning human development, personal and family finance, housing and interior design, food science and preparation, nutrition and wellness, textiles and apparel, and consumer issues.

Explanation:

I hope it will help you....

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The energy required to make one He-3 nucleus is 3.27 MeV.

The formation of He-3 can occur through several nuclear reactions, including the fusion of two deuterium nuclei, the decay of tritium, and the capture of a neutron by He-3. The energy required to make one He-3 nucleus varies depending on the specific reaction that is taking place.

However, the fusion of two deuterium nuclei, which produces He-3 and a proton, is one of the most common and energy-efficient reactions used to create He-3. This reaction requires an energy input of 3.27 MeV (mega-electron volts) to overcome the electrostatic repulsion between the positively charged deuterium nuclei and bring them close enough together for the strong nuclear force to take over and fuse the nuclei.

Regarding the balance of nuclear equations, all nuclear reactions must obey the laws of conservation of mass and conservation of charge. This means that the sum of the mass numbers and the sum of the atomic numbers (proton numbers) must be equal on both sides of the equation. Therefore, nuclear equations must be balanced to ensure that the same number of positive charges and the same mass are present on both sides of the equation.

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Explanation:

Three equations of motion are as follows:-