can someone please help

Answer: I believe the answer is C

Explanation:

Cars are composed of hundreds of simple machines

The correct answers to the conversions in the task above are as follows:

The degrees celsius is a scale grade which is used to define two different points. This scale system for instance works on the principle of zero degrees (0°) for the freezing point of water and hundred degrees (100°) for the boiling point of water.

From the task given above on converting 0.020kg to g,

Recall:

1000g = 1kg

to convert 0.020kg to grams

then we will have

1000g = 1kg

x = 0.020kg

Cross multiplying

x = 1000 × 0.020

= 20.

This means that we have 20g in 0.020kg.

In conclusion, we can now confirm from the explanation given above that the symbol of degrees celsius is °C.

Complete question:

Convert the following:

a. 5°C to degrees Fahrenheit =.............°F

b. 15°C to radians = ...............

c. 5400 Fahrenheit to degrees Celsius = .....°

d. 1h15min 27s=...........h=........min=..............

e. 47°k=...........°C

f. 58°k=...........°C

g. 0.020kg=.........g

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The correct answer is D. Amount of time and area of physical contact between the substances.

Explanation:

Heat transfer refers to the flow of thermal energy or heat between two or more objects. This process involves multiple factors and implies heat from the hottest object goes to the coldest one until there is an equilibrium. To begin, heat transfer depends on the amount of thermal energy in the objects because objects must have a different amount of thermal energy for heat to flow.

Besides this, the amount of energy that flows depends on the time and the contact between the substances of objects. Indeed, objects need to be in contact or close to each other for heat to transfer, and the time needs to be enough for the process to occur. For example, if you place a pot over the fire just for a few seconds it is likely the heat transferred is minimal, which does not occur if you leave the pot more time. At the same time if the pot is in close contact with fire more heat will be transferred.-

Answer:

the answer is D on edginuity.

Explanation:

Answer:

A = 2,

Explanation:

(3 + 2) - 7

2 -  A: 2

3 + 6 + 5

14 - B: 14

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Answer:

Friction or tension

Explanation:

Friction stops an object from moving in the presence of force

When the planet is at point A, given the location of the star, B. It's speed is increasing.

When a planet revolves around a star, it adheres to a curved pathway as a result of the gravitational pull between both entities. As per Kepler's planetary motions laws, a planet orbiting a particular star accelerates when it's at proximal distance to the star and decelerates when it is further away from it. These discrepancies stem from the stronger gravitational force that arises as the two objects are nearer in proximity.

The speed of the planet is therefore likely increasing because it is approaching the star and so the gravitational pull is stronger.

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Options for this question are:
a. its speed is constant. b. its speed is increasing c. its speed is decreasing d. its speed is a maximum. e. its speed is a minimum.

Answer:

370N

Explanation:

We can use the formula [ f = mg ] to solve.

f = (100)(3.7)

f = 370N

Best of Luck!

91% is the voltage applied to the load (secondary voltage) and the efficiency.

To determine the voltage applied to the load (secondary voltage) and the efficiency, we can use the equivalent circuit parameters of the transformer and the given load impedance.

Given parameters:

Transformer rating: 20 kVA

Transformer turns ratio: 800/230 [V]

R1 = R2 = 10 Ω

X1 = X2 = 50 Ω

Rc = 100 Ω

Xm = 20 kΩ

Load impedance: ZL = 2+j0.6 Ω

First, we can calculate the equivalent impedance seen by the primary side of the transformer using the turns ratio:

Zeq = (ZL * (N2/N1)^2) = (2+j0.6 * (230/800)^2) = 0.79+j0.237 Ω

Next, we can calculate the primary current (I1) using the formula:

I1 = V1 / (R1 + jX1 + Zeq) = 800 / (10+j50 + 0.79+j0.237) = 8.29 - j2.35 A

Now, we can calculate the secondary voltage (V2) using the turns ratio:

V2 = V1 * (N2/N1) = 800 * (230/800) = 230 V

Finally, we can calculate the efficiency (η) using the formula:

η = (Pout / Pin) * 100

Where Pout is the output power and Pin is the input power. Since this is a single-phase transformer, the power factor is given by:

Power Factor (PF) = Pout / Pin = (V2 * I2) / (V1 * I1)

We know V2 = 230 V, V1 = 800 V, and we can calculate I2 using Ohm's Law:

I2 = V2 / ZL = 230 / (2+j0.6) = 105.56 + j31.67 A

Now, we can calculate the power factor:

PF = (V2 * I2) / (V1 * I1) = (230 * (105.56 + j31.67)) / (800 * (8.29 - j2.35))

= 0.91 + j0.21

Finally, we can calculate the efficiency:

η = (PF) * 100 = (0.91 + j0.21) * 100 = 91% + j21%

Therefore, the secondary voltage applied to the load is 230 V, and the efficiency of the transformer is 91% with a power factor of 0.91 leading.

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The time it takes for the ball to reach its maximum height is 745 milliseconds.

What is time?

Time is defined as a scalar quantity that describes the progression of events in the universe. It is often considered to be the fourth dimension of spacetime, along with the three dimensions of space. Time is closely related to the concepts of causality, or the relationship between cause and effect, and is considered to be a fundamental aspect of the physical universe.

To find the time it takes for the ball to reach its maximum height, we need to use the equation:

1/2 * a * t^2 + v * t + d = 0

where a is the acceleration due to gravity (-9.8 m/s^2), t is the time, v is the initial velocity (2.13 m/s), and d is the initial displacement (0 m, since the ball is thrown upward from the ground).

We know that the ball is thrown upward and reaches its maximum height, so it is subject to a constant acceleration due to gravity in the downward direction. Therefore, the acceleration is -9.8 m/s^2.

The time to reach the maximum height can be found by solving the above equation for t.

t = sqrt(-2*d/(a+v))

t = sqrt(-2*0/(-9.8+2.13))

t = sqrt(2*2.13/(9.8-2.13))

t = sqrt(4.26/7.67)

t = sqrt(0.555)

t = 0.745s

To get the time in milliseconds:

t = 0.745s * 1000ms/s = 745 ms

Therefore, the time it takes for the ball to reach its maximum height is 745 milliseconds.

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Finding a suitable material for the filament of an incandescent light bulb was one of Thomas Edison's biggest obstacles.

The source of light in an incandescent light bulb is the filament, which is a wire-like structure. It is often constructed of tungsten or another material with a high melting point and good thermal shock resistance. When an electric current is sent through the filament, which is commonly twisted into a coil or loop shape, the filament heats up and starts to generate light.

Thermal radiation causes the filament to produce light. This is the result of the filament's temperature-related electromagnetic radiation output. The filament starts to emit infrared radiation and visible light as it warms up.

The filament's temperature and the kind of material it is constructed of affect the hue of the light it emits.

A glass bulb that has been evacuated or a bulb that has been filled with an inert gas, such as argon or nitrogen, surrounds the filament in an incandescent light bulb. By doing this, you can avoid the filament from burning out or breaking, which would make the lightbulb unusable.

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the correct option is B - actual volume of gas molecules and intermolecular forces.

The Van der Waals equation is a modification of the ideal gas law that takes into account the actual volume of gas molecules and the intermolecular forces between them. So, the correct option is B - actual volume of gas molecules and intermolecular forces. The ideal gas law assumes that gas molecules have no volume and do not interact with one another, which is not true for real gases. The Van der Waals equation corrects for these assumptions by introducing two additional parameters, the volume of the gas molecules and a factorfactor for intermolecular forces.
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All of the below contribute to an increase in carbon levels except D. Photosynthesis.

Carbon is an essential component of life on earth, and its role is crucial in maintaining the balance in the atmosphere. However, increased carbon levels, mainly carbon dioxide (CO₂), pose a threat to our planet and all the living beings on it. Burning fossil fuels, deforestation, and industrial processes are the major contributors to the increased levels of CO₂ in the atmosphere. Hence, humans play a significant role in climate change. However, the process of photosynthesis can reduce the carbon levels in the atmosphere as it involves absorbing CO₂ from the air and converting it into oxygen (O₂) and glucose.

Breathing is the process where humans and animals take in oxygen and release CO₂ into the atmosphere. Although breathing increases the levels of CO₂ in the atmosphere, it is not considered a significant contributor to the increased carbon levels. Decay of vegetation contributes to the increase in carbon levels as it releases CO₂ into the atmosphere during the process. Petrol burning releases CO₂ into the atmosphere and contributes significantly to climate change. Therefore, the correct answer to this question is option D, photosynthesis

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Balancing chemical equations ensures that the law of conservation of mass is upheld, as atoms cannot be created or destroyed in a reaction, and the same number of atoms of each element must be present on both sides of the equation.

In chemical reactions, it is important to ensure that the same number of atoms of each element are present on both the reactant and product sides of the equation. This principle is known as the law of conservation of mass, which states that the total mass of the reactants must equal the total mass of the products in a chemical reaction.

The balancing of chemical equations is essential for understanding the stoichiometry of a reaction, which refers to the study of the quantitative relationships between reactants and products in a chemical reaction. Balancing the equation involves adjusting the coefficients of the reactants and products so that the same number of atoms of each element is present on both sides of the equation.

The law of conservation of mass occurs because atoms cannot be created or destroyed in a chemical reaction. The atoms in the reactants must be present in the products, albeit in a different arrangement, which is why balancing is essential. Therefore, balancing the equation ensures that the mass of the reactants equals the mass of the products, and the law of conservation of mass is upheld.

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The doppler effect for sound shifts the sound towards higher or lower pitches.

Doppler effect

Doppler effect is defined as the increase or decrease in the frequency of sound, light, or other waves as the source and observer move towards or away from each other.

When a vehicle with a siren passes a noticeable drop in the pitch of the sound of the siren will be observed as the vehicle passes. This is an example of the Doppler effect.

So we get to know that if the doppler effect of light is a shift of spectral lines towards the blue or red end of the electromagnetic spectrum in the same way the doppler effect for sound shifts the sound towards higher or lower pitches.

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A message to travel from earth to a spacecraft at mars as its closest to earth is about 3.11 minutes.

To find the time, the given values are,

Distance = 56 million kilometers.

Here,

A message needs to be traveled to mars from earth and the distance between Earth and Mars (given) s = 56 million km

Speed of light = 3.00—10^5 km/ sec

As We know Velocity,

Velocity = distance / time

=> time = distance / velocity

Time taken t = 56 million km / 3.00—10^5

= 56 x 10^6 / 3 x 10^5

= 186.666 sec

Time taken t = 3.11 min.

So, the message to travel from earth to a spacecraft at mars as its closest to earth is about 3.11 minutes.

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If the ball isn't travelling as swiftly as the force is pushing itself to keep it moving (in a circular motion), it will fall because gravity and tension pull downward at the top of the swing.

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Answer:

Cuzz gravity seems so weak to us.

Answer:

cuase it is

Explanation:

Một đại lượng vectơ là một lực. Đại lượng vectơ là đại lượng có cả độ lớn và hướng, như chúng ta đã dạy trong phần trước. Bạn phải xác định cả độ lớn (kích thước hoặc số) và hướng của lực tác dụng lên một vật thể để mô tả hoàn toàn nó.

A simple way to measure your fluid balance is to look at the color of your urine. If your urine is dark and has a strong odor, you are definitely dehydrated and need to increase your water intake. If your urine is completely clear, you probably drank too much.

It usually takes about two hours for the body to fully rehydrate after drinking a significant amount of water. Water is best because you need to stay hydrated. Sports drinks like Gatorade can help athletes who need to replenish their electrolytes.

Research shows that milk is one of the best drinks for hydration better than water and sports drinks. Researchers attribute its effectiveness to milk's natural electrolytes carbohydrates and proteins. can take as little as 5-15 minutes. However, if you are dehydrated with an empty bladder it can take up to 8-9 hours before you need to urinate.

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The answer is W = 1.06 MJ.

Now develop and express of Force required:

                                            F = p*V*g

                                            F = 1000*(2*0.5*x*8*dx)*g

                                            F = 78480*x*dx

- Now, the work done is given by:

                                   W = F.s

Where s is the distance from the top of the hose to the differential volume:

                                        s = (5 - x)

We have the work as follows:

                              dW = 78400*x*(5-x)dx

Now integrate the following express from 0 to 3 till the tank is empty:

 W = 78400*(2.5*x^2 - (1/3)*x^3)

 W = 78400*(2.5*3^2 - (1/3)*3^3)

 W = 78400*13.5 = 1058400 J

To find the weight of water, begin by way of finding the density(1 kg/L at 39.2°) and the extent of water. Convert the volume of water to liters after which multiply by way of the density to discover the burden.

Density is useful in calculating the load of materials which can be tough to weigh. you may decide its weight without a doubt with the aid of multiplying the density by using the dimensions, or quantity, of the item.

The unique weight, additionally called the unit weight, is the weight in keeping with the unit quantity of cloth. A typically used value is the precise weight of water in the world at 4 °C (39 °F), which is nine.807 kilonewtons consistent with cubic meters or 62. 43 pounds-force in keeping with cubic foot.

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The distance between the focus point and the lens or mirror is known as the focal length, or f. ( F ). At this separation from a lens or mirror, parallel light rays will collide.

There are many different types of images, both actual and virtual ones. Actual photos can be distinguished from virtual ones by how they were made. A genuine image is produced when rays come together, whereas a virtual image is produced when they just appear to diverge.

Concave mirrors and converging lenses can only produce real images when the object is placed farther from the mirror/lens than the focal point and this real picture is reversed.

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Answer:

when a substance is heated, particles will gain more energy, and vibrate more.

Explanation:

Pls brainly I did my studys today! :D

The acceleration of this jet is equal to: C. 6.26 m/s².

In Physics, the acceleration of a physical object (jet) or body can be calculated by using this formula:

a = (V - U)/t

Where:  

Substituting the given parameters into the formula, we have;

Acceleration, a = (432.8 m/s - 138.5 m/s)/47 seconds

Acceleration, a = 294.3/47

Acceleration, a = 6.26 m/s².

In conclusion, we can logically deduce that this jet has an acceleration of 6.26 meters per seconds square (m/s²).

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Answer:

P = 140000 [Pa]

Explanation:

To solve this problem we must remember that pressure is defined as the relationship between Force on the area of a body.

In this particular problem, we are given the force acting on the upper surface of the block, including the force exerted by the atmospheric pressure.

P = F/A

where:

P = pressure [Pa] (units of Pascals)

F = force = 3.5*10⁴ [N]

A = area = 0.25 [m²]

P = 3.5*10⁴/0.25

P = 140000 [Pa]

Answer:

Initial velocity is the velocity at time interval=0 and it is represented by u.lt is the velocity at which the motion starts. they are four initial velocity formulas:(1) if time, acceleration and final velocity are provided,the initial velocity is articulated as.

l hope it's helpful for you.....

Answer:

4 m/s in negative acceleration

Explanation:

Acceleration = V- U/t

Where V is the final velocity

U is the initial velocity and t is the time given.

U = 65 m/s

V= 25 m/s

T= 10 seconds

Acceleration= (25m/s - 65m/s)÷10secs

= - 40/10

= -4m/s^2

Hence, it has a negative acceleration.

Answer:

A. negative acceleration of 4 m/s2

Hope this helps!

Explanation:

Calculate the magnitude of the net force using the Pythagorean theorem. The magnitude of the net force equals the square root of the sum of the squares of the x and y components of the net force.

To determine the magnitude of the net force on the first wire in Figure 1, please follow these steps:

Unfortunately, without more information about Figure 1 and the forces involved, I cannot provide a numerical answer. Please provide the necessary details to proceed with the calculation.

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Answer:

Because always when we do an experiment, we need something to compare.

For example, if we want to see how much change a given color paint when we add different amounts of white paint to it, we need to have at least one sample of pure color paint, so we can compare it whit the ones with mixed paints.

Well, the case of the polygraph is exactly the same, we need to have a baseline, so we the interviewer can see if for some questions there is a change in the line compared with the baseline.