Which of these reactions is a combustion reaction. •(A) burning wood. •(B) decomposition of water. •(C) production of food with the help of the suns energy. •(D) rotting of fruits and vegetables

[tex]R=\frac{U}{I}=\frac{0.5V}{180\cdot10^{-6}A}\approx2.78k\Omega[/tex]

Answer:

Lemon juice is your answer.

Answer:

200000

Explanation:

Answer: Quickly moving neutrons coming out of the reaction are slowed down by water. The water heats up and turns into steam. The steam turns the turbine and produces electricity.

Explanation: Hope that helps :D

The Answer is: D. Quickly moving neutrons coming out of the reaction are slowed down by water. The water heats up and turns into steam. The steam turns the turbine and produces electricity.

Answer:A

Explanation:

The image is formed behind the mirror.

Answer:

a

Explanation:

took the test

Answer: It should be A

Explanation:

Answer:A. Longitudinal waves

Explanation: The displacement of the medium parallel to the propagation of the wave is a characteristic of longitudinal waves. Longitudinal waves are also characterized by compression and rarefraction.

A wave propagated along the length of a stretched Slinky toy, the increase and decrease of the coil gives a good example of longitudinal wave.

Explanation:

Each resistor has a resistance of R.

In the first problem, each row of three resistors in series has a resistance or 3R.

A₂ = 4A, so the voltage drop across the rows is:

V = IR

V = (4)(3R)

V = 12R

The voltage drop equals the voltage gain (Kirchoff's voltage law).  The battery has a voltage of 9V, so:

9 = 12R

R = 0.75 Ω

The three rows are in parallel with each other, so the total resistance is:

∑R = (1/(3R) + 1/(3R) + 1/(3R))⁻¹

∑R = R

∑R = 0.75 Ω

The current A₁ can be found with Ohm's law:

V = IR

9 = (A₁) (0.75)

A₁ = 12 A

Using Ohm's law to find V₁, V₂, and V₃:

V = IR

V₁ = (4)(0.75)

V₁ = 3V

V₂ = (4)(2×0.75)

V₂ = 6 V

V₃ = (4)(3×0.75)

V₃ = 9 V

In the second problem, all the resistors are in series.  So the total resistance is:

∑R = 8R

The battery voltage is 16V, and A₂ = 6A.  So using Ohm's law:

V = IR

16 = (6)(8R)

R = 1/3 Ω

Since there's only one loop, the current is the same at all points.  So A₁ = A₂ = 6A.

Using Ohm's law to find each voltage:

V = IR

V₁ = (6)(1/3)

V₁ = 2V

V₂ = (6)(2×1/3)

V₂ = 4 V

V₃ = (6)(4×1/3)

V₃ = 8 V

V₄ = (6)(2×1/3)

V₄ = 4 V

For the circuit shown in the left side of the image, A₁=12A, V₁=3V, V₂=6V, and V₃=9V.

The voltage source is Vs = 3(3V) = 9V is connected in parallel to the three branches that each contain three equals light bulbs, the three branches are in parallel meaning that the voltage in each branch is 9V.

The current through one branch is A₂ = 4A, we can calculate the equivalent resistance in that branch using Ohm's Law:  

Req = V/I, where I = A₂ = 4A

Req = 9V/4A = 2.25Ω

We can calculate the resistance in each light bulb, there are three light bulb in each branch that have a equivalent resistance of 2.25Ω, the light bulbs are in serie, so:

Req = R + R + R = 3R

The resistance of each light bulb is R = Req/3 = 2.25Ω/3 = 0.75Ω

To calculate V₁, using Ohm's Law:

V₁ = I R = (4A)(0.75Ω) = 3V

Then, the other branches are in parallel and it has the same amount of light bulbs and the same characteristics, each branch has a equivalent resistance of 2.25Ω, and each light bulb has a resistance of 0.75Ω.

To calculate V₂ and V₃:

We know that the voltage in each branch is 9V, each light bulb has a drop of voltage of 3V. So, the total voltage in one branch is the sum of each drop of voltage on each light bulb Vt = 3V + 3V + 3V = 9V.

V₂ = 3V + 3V = 6v

v₃ = Vt = 3V + 3V + 3V = 9V

To calculate the total current A₁ through the circuit, we know that the current through each branch is 4A, the total current A₁ is:

A₁ = 3A₂ = 3(4A) = 12A

For the circuit shown in the right side of the image, A₁=A₂=6A, V₁=2V, V₂=V₄=4V, and V₃=8V.

The voltage source is Vs = 4(-4V) = -16V connected in series with 8 light bulbs, the current flow through each light bulb, It= A₁ = A₂ = 6A. The voltage source is Vs= -16V, the '-' means that the current flows in the opposite direction.

To calculate the equivalent resistance of the circuit, using Ohm's Law:

Req = Vs/It = 16V/6A = 2.67Ω

The resistance of each light bulb is R = Req/8 = 2.67Ω/8 = 0.33Ω

The drop of voltage on each light bulb is:

V = It R = (6A)(0.33Ω) = 2V

V₁ = 2V

V₂ = V₄ = 2(2V) = 4V

V₃ = 4(2V) = 8V

Answer:

Buddhist monks traveled from india to china and because of their beliefs they weren't allowed to use weapons

Answer:

False

Explanation:

Acceleration is defined as the rate of change of velocity:

[tex]a=\frac{\Delta v}{\Delta t}[/tex]

On a speed-time graph, the slope of the curve gives the magnitude of the acceleration. In fact, the slope of the curve in a speed- time graph is

[tex]m=\frac{\Delta y}{\Delta x}[/tex]

where

[tex]\Delta y[/tex] is the increment in the y-variable, so it corresponds to the change in speed

[tex]\Delta x[/tex] is the increment in the x-variable, so it corresponds to the change in time

so the slope corresponds to

[tex]m=\frac{\Delta v}{\Delta t}[/tex]

which is the magnitude of the velocity. However, in order to define acceleration we need an additional piece of information: the direction. Since speed is a scalar, direction of motion is not provided, so we cannot fully define acceleration from a speed-time graph.

Answer:

perception - A personal view of a situation...

Psychiatrist - mental health professional...

Clinical - concerned with the treatment of disease...

cognition - a person's ability to think.

empathy - Identifying someone's situation...

humanism - a person should be considered as a whole...

Educational psychologist - concerned with the way humans learn ...

Explanation:

1. Perception is the ability to interpret and understand what we sense through our different senses. In other words, it is the ability to understand what is going on in our environment through sight, sound, touch, and the like.

2. A psychiatrist is a medical doctor that deals with the treatment, prevention, and diagnosis of metal disorders. They can also treat patience through medication because they are allowed to prescribe medicines.

3. Clinical medicine involves the actual treatment of patients. You can think of it as the actual practice of medicine, and not theoretical and not just work in laboratories.

4. Cognition is a mental process that not only involves thinking, but also comprehension. It involves acquiring knowledge through experience and observation.

5. Empathy is the ability to understand how someone else is feeling in a particular situation. There's a saying, "Putting yourselves in other's shoes." This means to understand how it feels to be in that situation, which is also known as the act of empathizing.

6. Humanism, as the name suggests is HUMAN-centered. This means that one is considered not only by what others see but what the person sees as well. It is concerned with everything that has to do with that person both externally and internally.

7. Educational psychologist deals with children and school specifically. They assess how humans learn, how they think and how they behave in the school setting. They also do councelling for students, parents, teachers, and other people involved in the educational communities.

Answer:

25 m/s

Explanation:

Centripetal acceleration is the square of the tangential velocity divided by the radius.

a = v² / r

15.625 m/s² = v² / (40 m)

v² = 625 m²/s²

v = 25 m/s

The speed of the car is 25 m/s.

The molecules in hot gas move faster than cold gas. This would allow sound waves to travel faster.

Vacuums, do not have air pressure to transfer energy, so sound would not be able to travel very fast.

The answer is B. Hot Gas.

Answer:

Option B

Explanation:

Sound waves are mechanical waves it means they require a material medium for their propagation.

So, sound cannot travel through hot vacuum or cold vacuum.

The velocity of sound waves is directly proportional to the square root of absolute temperature of gas.

As the temperature of hot gas is more so sound travel fastest in hot gas.

Answer:

B. 285 km/5 min

Explanation:

The rule that links velocity, wavelength and frequency is:

V = λν

where:

V is the velocity that we want to find

λ is the wavelength of sound = 1 m

ν is the frequency of the wave = 950 Hz

Substitute to get the velocity as follows:

V = 1 * 950 = 950 meters/sec

Now, we need to convert the meter/sec into Km/5 minutes

We know that:

To convert from meter to Km, we will divide by 1000

To convert from sec to minute, we will divide by 60 which means that, to convert from sec to 5 minutes, we will divide by 5*60 = 300

Based on this:

[tex]950 \frac{meter}{sec}=950*\frac{\frac{1}{1000}}{\frac{1}{300}} = 950*\frac{3}{10}=285 km/5 min[/tex]

Hope this helps :)

Final answer:

To find the distance travelled by sound in 5 minutes, we calculate the speed using the formula v = fλ, resulting in 950 m/s. Converting to km/min and multiplying by the time, we find the sound travels 285 kilometers in 5 minutes, corresponding to option B.

Explanation:

The question is asking to calculate the distance travelled by sound with a given frequency and wavelength over a period of 5 minutes.

First, we find the speed of sound (v) using the formula v = fλ, where f is frequency and λ is wavelength.

Speed of sound = 950 Hz × 1 m = 950 m/s.

To convert speed to kilometers per minute, we divide by 1000 to convert meters to kilometers and then multiply by 60 since there are 60 seconds in a minute:

Speed in km/min = (950 m/s) / 1000 × 60 = 57 km/min.

To find the distance travelled in 5 minutes, we multiply the speed in kilometers per minute by the duration:

Distance travelled = 57 km/min × 5 min = 285 km.

Therefore, the correct answer to the question is 285 kilometers, which corresponds to option B.

Answer:

Increasing the masses of the objects and decreasing the distance between the objects

Explanation:

The force of gravity pulls every body with mass towards the center of the earth.This is the force of attraction between two bodies as a result of their masses.Gravity force is directly proportional to the mass of a body.A body with more mass experiences a greater force of gravity.Additionlay, when the distance between two bodies decreases, the gravitational force increases.

Answer:

Increasing the masses of the objects and decreasing the distance between the objects

Explanation:

Answer:

The Sun. The heat that eventually causes the earth to warm actually comes from the sun. The sun is a huge ball of gases, mainly hydrogen. Every day, the hydrogen in the sun is converted into helium through millions and millions of chemical reactions.

Does this help?

Answer:

A- similar to todays climate

Explanation:

I answer d and got it wrong

Fossils found in the La Brea tar pits indicate a California climate that was similar to today's climate. The correct option is A.

The La Brea Tar Pits is famous for the Fossils found in the Ice Ages,. The California climate still falls within our current climate.

California climate is like Mediterranean with somewhat like warm, dry summers with mild and wet winters. The average coastal temperature is around 70°F to 80°F.

Thus, fossils found in the La Brea tar pits indicate a California climate that was similar to today's climate. The correct option is A.

Learn more about La Brea.

https://brainly.com/question/9740301

#SPJ2

Answer:

D.It bounces the light away from a focal point.

Explanation:

A convex mirror reflects the incident light away from the focal point of the mirror hence forming a virtual image.Light from a point will be bounced into different directions according to the law of reflection rather than being directed to a single point.To know the image position, an extrapolition of the relected line should be extended behind the mirror to locate the virtual image.

A convex mirror forms an image by reflecting light away from a focal point due to its outward facing curved surface, producing a smaller and upright image.

A convex mirror forms an image by bending, or refracting, light away from a focal point (B). This is due to the mirror's curved, outward facing surface. When light rays strike the mirror, they are reflected and diverge outward, appearing to come from a virtual focal point behind the mirror. As a result, the formed image is smaller than the object and is upright, which is why convex mirrors are often used in places where a wide field of view is required, such as in vehicle side mirrors and security mirrors in shops.

https://brainly.com/question/33230797

#SPJ6

Answer:

A

Explanation:

Energy is stored inside the batteries. Thus it is chemical potential energy

Answer:

A. Chemical Potential Energy

Explanation:

Plato/Edumentum

Answer:

C) baby chicks under a heat lamp

Explanation:

The heat transfer by radiation is observed in the case that some chicks are heating with a heat lamp since heat is transmitted without contact between the surfaces

In the case of ironing the shirt, the transfer is made by the contact of the iron with the shirt.  In the case of the lava lamp, the most important transfer is that of light energy, and in the case of coffee in the snow, when the coffee cup is placed in the snow, the heat will also be transferred by the contact of the surfaces

Answer:

The answer is C.)

Explanation:

I hope this helps :)

Answer:

The answer is B

Explanation:

It's past tense and dad is singular

Final answer:

The correct answer is b: "Dad chose a striped tie to wear with his suit," as 'chose' is the appropriate simple past tense form of 'choose.' It's important to use the correct verb tenses to clearly convey when actions occur.

Explanation:

The question asks: Which sentence uses the correct form of the verb choose? The correct answer is option b: "Dad chose a striped tie to wear with his suit." This is because 'chose' is the simple past tense form of the verb 'choose,' which is appropriate given the context of a completed action.

Verb tenses are crucial for conveying when an action happens. In English, getting the irregular verbs right, such as 'choose,' requires familiarity with their present, past, and past participle forms. The incorrect options a, c, and d use 'chosed,' 'chosen,' and 'choose,' respectively, which are not correct in this context. 'Chosed' is not a word, 'chosen' is a past participle that needs an auxiliary verb, and 'choose' is the present tense form.

Answer:

160,000 N

Explanation:

Given:

m = 320,000 kg

v₀ = 0 m/s

a = constant

t = 57 s

Δx = 810 m

Find: Fnet

Apply Newton's second law:

∑F = ma

Fnet = ma

To find Fnet, we must first find the acceleration.

x = x₀ + v₀ t + ½ at²

810 m = 0 m + (0 m/s) (57 s) + ½ a (57 s)²

a = 0.50 m/s²

Fnet = (320,000 kg) (0.50 m/s²)

Fnet = 160,000 N

Answer with explanation:

The energy which is stored in an object because of its position or state is known as the Potential energy.

Here are a few examples of objects having potential energy:

1. A car on the hill - since the car is on a heightened position, it will have potential energy.

2. A stretched rubber band - when a rubber band is stretched to one side, it has potential energy.

3. A book placed on a table - a book on the table before it falls down has potential energy.

1 m/s². A runner that change is speed from 6 m/s to 10 m/s has an aceleration of 1 m/s².

the key to solving this problem is using the kinematics equation [tex]a=\frac{v_{f} -v_{0}}t}[/tex] which means that the aceleration is related to a change of velocity in an interval of time.

We know that the runners runs at a initial velocity of 6 m/s, four seconds later, she is running at a speed of 10 m/s.

[tex]a=\frac{10\frac{m}{s}-6\frac{m}{s}}{4s}  \\a=1\frac{m}{s^{2} }[/tex]

Answer:

C. a few days

Explanation:

The evidence that we will have to investigate is the gunshot residue on the body of the suspect. When a person fires a gun there will be a deposition of material from the components of the chemicals present in the gun. This deposit is called gunshot residue and consists of particles of the propellant or explosive primer.

Experimentation has shown that the period of time that is person will test possible for gunshot residue is 5.27 days.

Answer:

A Few Hours

Explanation:

Residue on the hands can be difficult to find, even with modern forensic techniques. Part of the reason for this is that the residue doesn’t last for long on hands, particularly if the shooter washes, wipes, or rubs their hands. Studies indicate that even within hours of a shooting, it can be very difficult to find gunpowder residue on the hands of a shooter.

Answer:Physicists deal with the four fundamental forces, which are the gravitational force, weak nuclear force, strong nuclear force, and electromagnetic force. The electrostatic force is associated with the electromagnetic force. Here is the definition of electrostatic force, its history, and a look at how it's calculated

Explanation:

Answer:

Electrostatics is a branch of physics that studies electric charges at rest. Since classical physics, it has been known that some materials such as amber attract lightweight particles after rubbing.

Explanation:

Electrostatic forces are attractive or repulsive forces between particles that are caused by their electric charges. This force is also called the Coulomb force or Coulomb interaction. It is named for the French physicist Charles-Augustin de Coulomb, who described the force in 1795.

Answer:

150 km/h

Explanation:

A speed measures a distance traveled over a period of time.  We usually express speed in terms of km/h for example.

That train travels 600 km in 4 hours.

To find its average speed, we just need to divide 600 km / 4 hours

We then get 150 km/h

That's said to be the average speed since it's the total distance in the total of time.... it might have been slower or faster at different points during that distance/time.

Answer:

Explanation:

That an optical illusion somehow interferes with the way we see things. Even simple illusions can completely fool us. If you search out the term, you'll see all kinds of them.

Most critically we see one thing and know another to be true. But knowing the truth doesn't help us. We still see and believe the truth of the illusion.

The correct answer to this open question is the following.

Psychologists learned about perception from optical illusions that the response of the senses, when faced with optical stimuli, is different and can be measured because the human can interpret an optical stimulus as being real.

Gustav Fechner (1801-1887) was a German physicist who developed the science that studied quantitative relations of stimuli and sensations. It is called psychophysics. In 1860, he published the book "Elements of Psychophysics," in which he studies how the perception determines the sensory input.

Answer:

32.5 m/s

Explanation:

The total momentum must be conserved before and after the collision:

[tex]p_i = p_f\\m_c u_c + m_t u_t = m_c v_c + m_t v_t[/tex]

where

m_c = 300 kg is the mass of the car

m_t = 600 kg is the mass of the truck

u_c = 60 m/s is the initial velocity of the car

u_t = 10 m/s is the initial velocity of the truck

v_c = 15 m/s is the final velocity of the car

v_f is the final velocity of the truck

Solving for v_f, we find:

[tex]v_f = \frac{m_c u_c + m_t u_t - m_c v_c}{m_t}=\frac{(300 kg)(60 m/s)+(600 kg)(10 m/s)-(300 kg)(15 m/s)}{600 kg}=32.5 m/s[/tex]

they take a long time to heat up because stone has a high heat capacity, meaning it takes more heat to warm it up than other materials. so if you warm it up it will also take a long time to get cold because it is efficient at trapping and insulating heat.

Stone has a high specific heat capacity so it takes a lot of energy to get it to reach a good temperature.

Stones absorbs heat, holds it for a period of time, and then passes it on. However, if the walls are thick enough then it can act like insulation in that it takes quite awhile for the heat to penetrate.

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K (or 1 °C)

Stone has a high specific heat capacity so it takes a lot of energy to get it to reach a good temperature. One it has reached that temperature it has to lose a lot of energy for the temperature to go down

Stones absorbs heat, holds it for a period of time, and then passes it on. However, if the walls are thick enough then it can act like insulation in that it takes quite awhile for the heat to penetrate.

learn more about  specific heat capacity  :

https://brainly.com/question/11278589?referrer=searchResults

#SPJ2