AWARDING BRAINLIEST
Which is the best example of the transfer of heat through radiation?
the Sun providing heat to a solar panel
water boiling in a pot on a hot stove
a room in a house being warmed by a fireplace
a spoon becoming hot when placed in a cup of coffee

The dark area (shade) behind an object that obstructs the path of light is called a shadow

We can only see the outline of the object in a shadow. All details about the object cannot be seen. It is always dark in colour despite the colour of light or the colour of the object.

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 6.5 × 12.3

We have the final answer as

Hope this helps you

Answer: 28.699

Explanation:

KE=1/2(mv²)

1800=1/2m (125.44)

14.349=2m

m=28.699

Answer:

28.699

Explanation:

Eating broccoli absorbs chemical energy that your body converts to energy that your body needs, such as energy for movement , temperature control and other life processes.

 This refers to a green plant that is edible. It is in the cabbage famil. It has a large flowering head, stalk, and small associated leaves that are eaten as a vegetable. Broccoli is classified in the Italica cultivar group of the species Brassica oleracea.

Broccoli is a nutrient-rich vegetable that may enhance your health in a variety of ways, such as by reducing inflammation, improving blood sugar control, boosting immunity, and promoting heart health.

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Answer:

100 centimeters = 1 m

Explanation:

Hopefully this helps you

pls mark brainlest

Answer: One meter is equal to 100 centimetres.

To find this value, we would multiply the amount of meters (in this case, 1) by the amount of centimetres, which is 100. You would do the same if you had 3 meters, for example; 3 * 100 is equal to 300, so 3 meters is equal to 300 centimetres.

Given parameters:

Displacement = 8km

Velocity  = 3.8km/h

Unknown:

time  = ?

Solution:

Velocity is displacement divided by time.

  Velocity  = \(\frac{displacement}{time}\)  

      Displacement  = velocity x time

Input the parameters:

              8  = 3.8  x time

 Time  = \(\frac{8}{3.8}\)   = 2.1s

The time taken is 2.1s

Answer:

so if it's 20 you should put 20 times 10 15 * 30 and 1.3 * 5 mg and if you put that milligrams in there it'll solve the destination I saw the white way you going so yeah just be careful at least you want to make the milligrams even a multimacy with the y i and replace it with the 14a

Answer:

Approximately \(1.04 \; {\rm J \cdot g^{-1} \cdot K^{-1}}\).

Explanation:

Multiply energy input by efficiency to find the useful energy output:

\(\begin{aligned}& (\text{useful out}\text{put}) \\ &= (\text{efficiency})\, (\text{energy in}\text{put}) \\ &= (87.5\%)\, (1560\; {\rm kJ}) \\&= (0.875)\, (1560\; {\rm kJ}) \\ &= 1365\; {\rm kJ}\end{aligned}\).

In other words, \(1365\; {\rm kJ}\) of energy was supplied to the air in the building.

The standard unit of energy is Joules (\({\rm J}\).) Apply unit conversion:

\(\begin{aligned}(1365\; {\rm kJ})\, \left(\frac{10000\; {\rm J}}{1\; {\rm kJ}}\right) = 1.365\times 10^{6}\; {\rm J}\end{aligned}\).

Let \(c\) denote the specific heat capacity of the air in this building. Let \(m\) denote the mass of the air.

Let \(Q\) denote the energy supplied to the air. Let \(\Delta T\) denote the change in temperature. The equation \(Q = c\, m\, \Delta T\) relates these quantities.

In this question, the change in the temperature of the air in this building is:

\(\Delta T = (22.1\; {\rm ^{\circ} C}) - (11.6\; {\rm ^{\circ} C}) = 10.5\; {\rm K}\).

Rearrange the equation \(Q = c\, m\, \Delta T\) to find specific heat capacity \(c\):

\(\begin{aligned}c &= \frac{Q}{m\, \Delta T} \\ &= \frac{1.365 \times 10^{6}\; {\rm J}}{(125\; {\rm kg})\, (10.5\; {\rm K})} \\ &\approx 1.04 \times 10^{3}\; {\rm J \cdot kg^{-1} \cdot K^{-1}}\end{aligned}\).

Answer: It is the study of the environment and objects around us and how they interact with each other. It is a systematic study that involves collecting information, observing,and  experimentation.

Explanation:

Answer:

Wood is lighter than iron of the same volume because wood has a lower density. Density is a measure of mass per unit volume, and iron is denser than wood. Iron has tightly packed atoms with strong metallic bonds, while wood has a porous structure with empty spaces between its fibers and cells. These empty spaces in wood reduce its overall mass for a given volume, resulting in its lighter weight compared to iron.

Explanation:

appreciate you helping me, what shall one do if he thinks he has done a mistake and wants to reverse it? related to bul l yinging stuffs in school

Answer:

Subscribe my Gaming channel Sameer Duos

Explanation:

Generally, a seismograph consists of a mass attached to a fixed base. During an earthquake, the base moves and the mass does not. The motion of the base with respect to the mass is commonly transformed into an electrical voltage. The electrical voltage is recorded on paper, magnetic tape, or another recording medium.

The law of reflection states that when light is reflected off a surface, the angle of incidence equals the angle of reflection.

Two plane mirrors are set at a 120-degree angle to each other in this issue. When light strikes a mirror, it is reflected. The angle of incidence equals the angle of reflection when this occurs. The angle at which a beam of light strikes a mirror is known as the angle of incidence. The angle between the reflected ray and the surface normal is known as the angle of reflection. The angle between the incident ray and the surface normal is known as the angle of incidence. When light is reflected off a surface, the angle of incidence equals the angle of reflection. When the incident ray strikes the first mirror at a 65-degree angle, the reflected ray will be reflected at a 65-degree angle. When the reflected ray hits the second mirror, it will be reflected at a 55-degree angle. To compute the final angle of reflection, we subtract this from 120 degrees. This implies that the reflected ray will leave the second mirror at a 65-degree angle. So, the answer to the question is 65 degrees.

When light is reflected off a surface, the angle of incidence equals the angle of reflection. When the first mirror is hit at a 65-degree angle of incidence, the reflected ray will be reflected at a 65-degree angle of reflection. When the reflected ray hits the second mirror, it will be reflected at a 55-degree angle. The angle of reflection can be determined by subtracting this value from 120 degrees. Thus, the reflected ray will leave the second mirror at a 65-degree angle.

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The magnitude of the resultant vector is 4.14m and the direction is 50°.

The resultant magnitude of the vector is the sum of the algebraic forces acting at the point.

The magnitude of the resultant vector, F is calculated below:

\(F = \sqrt{3.14^{2} + 2.71^{2}} = 4.14m\)

The direction is given below as follows:

\(x = tan^{-1} × \frac{3.14}{2.71} = 50\)

Therefore, the magnitude of the resultant vector is 4.14m and the direction is 50°.

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Answer:

The work done by the 20 N force is 61.3 J

Explanation:

20 N Force at horizon is: F=20 N*cos 40=15.32 N

The work done by 20 N at horizon is: W=F*S=15.32 N* 4 m=61.3 J

Answer:

The work done by the 20 N force is 61.3 J

Explanation:

Answer:

91 kg

Explanation:

F = m a

893 = m *9.81 m/s^2

91 kg

If an astronaut weighs 148 N on the Moon and 893 N on Earth, his terrestrial mass is 91 kg

Therefore,

F = m a

893 = m × 9.81 m/s^2

91 kg

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Answer:

d) the object gets bluer

blue wavelengths are shorter than red wavelengths (in the visible spectrum)

blue light will carry more energy than an equivalent amount of red light

The appearance of an object as it gets hotter is that the object gets bluer. Hence, option (d) is correct.

Wavelength is the separation between the equivalent points of two successive waves. When two points or particles are referred to be "corresponding points," it means that they are both in the same phase and have completed exactly the same portions of their vibration. Typically, the wavelength of transverse waves—those whose points advance at right angles to one another—is assessed from crest to crest or from groove to trough; for longitudinal waves—those whose points advance in the same direction—the wavelength is measured from compression to compaction or from rarefaction to rarefaction.

A wave train's speed (v) in a medium is equal to its frequency (f), hence the formula for wavelength is v/f. Wavelength is commonly represented by the Greek character lambda λ.

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Answer: C.

He must move the magnet through the inside of the wire coil.

Explanation:

To detect a current Felix must move the magnet around wire coil. This magnetic field around the wire make the electrons mobile and creates an electrical current. Hence. option B is correct.

Electricity can be  created using magnetic' characteristics. Electrons are pushed and pulled by moving magnetic fields. Electrons in metals like are loosely held in their valence shell. Hence they can be transited easily.

The electrons in the wire are pushed when a magnet is moved around it or when a coil of wire is moved around a magnet, producing an electrical current. Kinetic energy, or the energy of motion, is effectively transformed into electrical energy via electricity generators.

The coil of metallic wire can produce a magnetic field in turn also. This is what called the electromagnetic induction. Therefore moving the bar magnet around the coil generates an electric current and results in a deflection in ammeter.

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The leaves are getting closer.

An electroscope is an early scientific instrument used to detect the presence of electrical charges in a body. The charge is detected from the motion of the test object due to the Coulombic electrostatic force acting on the test object. The amount of electric charge on an object is proportional to the voltage. The electroscope consists of a metal button and he two blades. When a negatively charged object is brought close to the instrument, the blade will repel and move away. There are two types of electroscopes: the medulla electroscope and the gold foil electroscope. When a negatively charged object is brought close to the electroscope, the charge induces a positive charge on the leaves. So nothing should happen. However, induction causes the leaves to move closer together.

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Answer:

Number of electron wavelength will Double

Explanation:

let the radius = r  and wavelength = λ

when R doubles and  λ ( wavelength ) remains the same

The number of electron electron wavelengths will double as well

Using Bohr's angular momentum quantization to show this

attached below

Answer:

b. has landforms made by flowing liquid water

- has many huge on its surface

- gets its red color from iron oxide present in soil and rocks on surface

- reflects light from sun

Explanation:

Answer:

Covalent bond.

Explanation:

There are 4 main types of bonds:

Covalent, ionic, metallic, and hydrogen.

Covalent bond: Involves the sharing of pairs of electrons, here the difference between the electronegativity of the atoms is not too large. Covalent bonds usually form an octet of electrons.

Ionic bond: This happens because the electrostatic attraction between the atoms whit very different electronegativities

Hydrogen bond: Electrostatic attractive force between an electronegative atom and a hydrogen atom covalently bonded to another electronegative atom.

Metallic bond: Type of bond that makes the metallic atoms to stay really tightly together. The atoms bond because of the electrostatic atractive force between conduction electrons and positively charged metal ions.

Now, in this case, we have the bond between Nitrogen (electronegativity = 2.0) and Hydrogen (electronegativity = 2.1)

So we can see that:

The elements are not metals, so we can discard metallic bond.

For a hydrogen bond, we need 3 atoms (one of which is hydrogen), here we have two, so we can discard this option.

Ionic bond needs different electronegativities, here the electronegativities are really close together, so the ionic bond can be discarded.

we can conclude that the bond will be a covalent bond.

I = 4.5 A

Explanation:

P = VI ---> I = P/V

I = (495 W)/(110 V)

= 4.5 A

true

Explanation:

because in physiology, respiration is the movement of oxygen from the outside environment to the cells within tissues, and the removal of carbon dioxide in the opposite direction.

Momentum is conserved in both elastic and inelastic collisions.

A collision is an event in which two or more objects interact with each other and experience a change in motion as a result of their interaction. Collisions can range from minor interactions between particles to massive collisions between astronomical objects, such as planets or stars. When two objects collide, their total momentum before the collision is equal to their total momentum after the collision, as long as no external forces are acting on the system. This principle is known as the law of conservation of momentum.

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The conclusion that can be drawn after a period of time, however, the object stops accelerating when a force is continuously applied to an object is that the object has reached its maximum velocity and has stopped accelerating in most cases.

Acceleration refers to the rate of change of velocity with respect to time.

The velocity of an object is changing when it accelerates, either by speeding up, slowing down, or changing direction.

The acceleration of an object may be computed using the following formula:a = (v₂ - v₁) / (t₂ - t₁)Where:a = accelerationv₁ = initial velocityv₂ = final velocityt₁ = initial timet₂ = final time

An object will no longer accelerate when it has reached its maximum velocity.

This can happen when an external force is applied to the object, causing it to accelerate until it reaches its maximum velocity

.The object will no longer accelerate when it reaches its maximum velocity because the force and resistance are now balanced. When the net force on an object is zero, it is in a state of equilibrium, and its motion is no longer influenced by external forces.

Therefore, if a force is continuously applied to an object, causing it to accelerate and then stop after a period of time, it can be concluded that the object has reached its maximum velocity and has stopped accelerating in most cases.

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Integrating the velocity equation, we will see that the position equation is:

\($f(t)=\frac{\cos ^3(\omega t)-1}{3}\)

Let the velocity of the particle is:

\($v(t)=\sin (\omega t) * \cos ^2(\omega t)\)

To get the position equation we just need to integrate the above equation:

\($f(t)=\int \sin (\omega t) * \cos ^2(\omega t) d t\)

\($\mathrm{u}=\cos (\omega \mathrm{t})\)

Then:

\($d u=-\sin (\omega t) d t\)

\(\Rightarrow d t=-d u / \sin (\omega t)\)

Replacing that in our integral we get:

\($\int \sin (\omega t) * \cos ^2(\omega t) d t$\)

\($-\int \frac{\sin (\omega t) * u^2 d u}{\sin (\omega t)}-\int u^2 d t=-\frac{u^3}{3}+c$\)

Where C is a constant of integration.

Now we remember that \($u=\cos (\omega t)$\)

Then we have:

\($f(t)=\frac{\cos ^3(\omega t)}{3}+C\)

To find the value of C, we use the fact that f(0) = 0.

\($f(t)=\frac{\cos ^3(\omega * 0)}{3}+C=\frac{1}{3}+C=0\)

C = -1 / 3

Then the position function is:

\($f(t)=\frac{\cos ^3(\omega t)-1}{3}\)

Integrating the velocity equation, we will see that the position equation is:

\($f(t)=\frac{\cos ^3(\omega t)-1}{3}\)

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Velocity of the satellite that is orbiting earth is 83.45m/s, which makes the velocity of the rivet relative before striking also 83.45m/s and the time duration of collision is 4.53× 10⁻⁵ s. The avg force that is exerted by the rivet on the satellite is 9.27N and the energy that is generated by the collision is 1.63J.

a) Velocity of the satellite in an orbit 900 km above Earth's surface can be calculated as follows: Formula: `v = sqrt(GM/r)` Where,v = velocity, M = Mass of Earth, r = radius of the orbit (r = R + h)R = radius of the Earth = 6.37 × 10⁶ mh = height above Earth's surface = 900 km = 9 × 10⁵ mG = 6.67 × 10⁻¹¹ N m²/kg²By substituting the given values, we getv = sqrt((6.67 × 10⁻¹¹ × 5.97 × 10²⁴)/(6.37 × 10⁶ + 9 × 10⁵))= sqrt(6.965 × 10³) = 83.45 m/s.

Therefore, the velocity of the satellite in an orbit 900 km above Earth's surface is 83.45 m/s.

b) Velocity of the rivet relative to the satellite just before striking it can be calculated as follows: Velocity of the rivet, `v_rivet = v_satellite * sin(θ)`Where, v_satellite = 83.45 m/sθ = 90°By substituting the given values, we getv_rivet = 83.45 * sin 90°= 83.45 m/s.

Therefore, the velocity of the rivet relative to the satellite just before striking it is 83.45 m/s.

c) The time duration of collision, `Δt` can be calculated as follows:Δt = (2 * r_rivet)/v_rivet, Where,r_rivet = radius of the rivet = 3/2 × 10⁻³ m. By substituting the given values, we getΔt = (2 * 3/2 × 10⁻³)/83.45= 4.53 × 10⁻⁵ s.

Therefore, the time duration of collision is 4.53 × 10⁻⁵ s.

d) The average force exerted by the rivet on the satellite, `F` can be calculated as follows: F = m_rivet * Δv/ΔtWhere,m_rivet = mass of the rivet = 0.5 g = 0.5 × 10⁻³ kgΔv = change in velocity of the rivet = 83.45 m/sΔt = time duration of collision = 4.53 × 10⁻⁵ sBy substituting the given values, we get F = (0.5 × 10⁻³ * 83.45)/4.53 × 10⁻⁵= 9.27 N.

Therefore, the average force exerted by the rivet on the satellite is 9.27 N.

e) The energy generated by the collision, `E` can be calculated as follows: E = (1/2) * m_rivet * Δv²Where,m_rivet = mass of the rivet = 0.5 g = 0.5 × 10⁻³ kgΔv = change in velocity of the rivet = 83.45 m/s. By substituting the given values, we getE = (1/2) * 0.5 × 10⁻³ * 83.45²= 1.63 J.

Therefore, the energy generated by the collision is 1.63 J.

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Answer:

A to B is in constant speed. b to c is speeding up. c to d is not moving. d to e is slowing down.

Explanation:

a to b is at a constant rate of acceleration. (It is speed up but it is doing it consistantly) The line is curving upwards means it is speeding up just not consistantly like a to b. c to d is not going up or down which means it is not in motion. d to e is slowing down because the line curvs down ward.

A to B is at a constant pace. b to c is rushing up. c to d isn't always transferring. d to e is slowing down.

The graph on which the immediate position x of a particle is plotted at the y-axis and the time t at the x-axis is known as the location-Time graph.

The precept is that the slope of the road on a position-time graph exhibits beneficial records about the rate of the object. it's miles frequently stated, "because the slope goes, so is going the rate." anything characteristic the speed has, the slope will exhibit the same.

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