I’m so confused about this question. Could anyone pleease explain to me how to solve these kinds of questions?

As the air flows through convection oven, the required temperature less for this type of oven and convection ovens cook food more quickly and evenly.

Compared to a traditional oven, a convection oven enables a reduction in cooking temperature. This comparison will change based on various elements, such as the quantity of food being cooked at once or when airflow is being impeded, such as by an excessively large baking tray.

The fact that flowing air transfers heat more quickly than still air of the same temperature balances out this variation in cooking temperature. The temperature must be lowered to slow down the rate of heat transfer in order to transfer the same quantity of heat in the same length of time.

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Answer:

47 kJoules (kJ)

Explanation:

Potential enegy on Earth is given by the relationship:

P.E. = mgh, where m is mass, g is the acceleration due to Earth's gravity, and h is height. Since we are given metric values, we will look for an answer that is consistent with Joules, the metric measure of energy. 1 Joule is defined as 1 kg*m^2/s^2, so we wnat units of kg, m, and sec.

We are given:

m = 95kg

h = 50 meters

Earth's gravity, g is 9.8 m/s^2

Enter the data:

P.E. = mgh

P.E. = (95kg)(9.8m/s^2)(50m)

P.E. = 46550 kg*m^2/s^2 or 46550 Joules(J)

Since we only have 2 sig figs, and since 1kJ =- 1000J

We can state the potential energy is 47kJ.

Spiderman has 47kJ of potential energy for the start of any dive back to Earth. [He needed that same amount of energy to reach that height, but we don't know from where it came. A jump, helicopter, beamed up by Scotty, or tossed up by Doctor Octopus.]

What this tells Zoe about the substance is that 12 degrees Celsius is the average kinetic energy of the substance.

The temperature of a substance is defined as the average kinetic energy of all the atoms or molecules of that substance.

Also, the temperature of a substance is the measure of the degree of hotness or coldness of the substance.

The temperature of a substance can be measured with different units and they include the following;

Thus, the temperature of a substance tells about the average kinetic energy of the substance or the degree of hotness or coldness of the substance.

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Answer: Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth

Explanation:

Answer:

Two coins.

Explanation:

place the at the sharp point

When a 30 micro of capacitor is attached to the a 9 v battery at its intermediate level, the equation states that 2.7μC is the charges on the capacitor.

A capacitor operates on the basis that capacitance of the a conductor exhibits rise when a grounding conductor is introduced near it. As a result, the capacitance has parallel plates that are spaced apart from one another and facing in opposing directions.

Two conductors that are separated from one another and positioned close to one another make up a capacitor, a electrical energy storage device. A parallel-plate capacitor is a simple example with one such storage device.

If we rearrange the previous formula to account for C=30F and V=9v in our issue, we can calculate the charge held in the capacitor:

             Q=CV

                =(30μF) (9v)

                =2.7μC

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Answer:

1 and 5

Explanation:

Kinetic energy is the energy that an object possesses due to its motion. Since the pendulum has 0 velocity at points 1 and 5, and it is at those points that the pendulum is furthest from its equilibrium position, we say that it has no kinetic energy and maximum potential energy.

When a wheel has eight spokes and radius and angular velocity is given then the minimum speed that the arrow must have is 3.87 m/sec.

A bar or rod that connects the center of a wheel to its rim is known as spoke. The main purpose of spokes is to support structure of the wheel.

Given: radius = 29.5cm  and angular velocity = 2.14 rev/sec

length of arrow = 22.5cm

Angle between spokes = 2π/8 = π/4

Time taken to reach adjacent spoke =Ф/ω

= π/4/ 2.15 (2π)

= 0.058 sec

For the arrow to pass through spokes, time should be less than 0.058 sec.

Then, minimum speed = 22.5/100/0.058

= 3.87 m/sec

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Answer:

Build a fire

Explanation:

The efficiency of a solar cell is defined as the percentage of the total energy input that does useful work. Hence, this statement is true.

Efficiency of a solar cell refers to the ratio of solar cell result to input energy from the sun rays. Efficiency means an indicator that is used to compare the presentation of one solar cell to another. Efficient energy can be described as the process of make the amount of energy required to provide products and services become less than before. The example of efficient energy is insulating a building lets it to make less heating and cooling energy to get and maintain a thermal comfort. Energy-efficient homes and buildings use energy to heat a bit, cool, and run appliances and electronics, and energy-efficient manufacturing facilities use a bit energy to create items.

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Answer

Explanation: Ok so I had a lot of trouble with this too. What I did was get some butter beans and put them under my pillow (If you don't have butter bens then butter works but must be unsalted country croks butter. I can't believe it's not butter will not work because the spirit people know and will put a spell on you. Then you get a 8lb. sweet potato and tie it to a piece of tweed and hand it on your fan at the highest setting until it flies out the string. Where ever it lands is where you sleep. Sleep with the potato where it landed. 30 minutes before you go to bed brush your teeth with a special drink.

Drink Ingredients:

2 spinach leaves

1 ounce of maple syrup

3 spoons of coco butter

1 rabbit ear

7 bear hairs

2 toe nail clipping form your dad (If you don't have one then I would give up)

When you drink this and go to sleep dream about the magical elves and eaves that will come to you in your dream. They'll give ask you a question where you will answer "Yes papas fritas"

A large disformed mutant will appear. Don't be afraid. Approach with confidence.

After that a glowing door will appear and BAM you're shifting.

*Pls note this could end in serious harm and danger I do not recommend attempting as it can result in death, a coma, or other injury. Have a Beautiful day :)

Answer:

oxygen, hydrogen, and sulfur. It has a molecular weight of 98.079 g/mol. H2SO4 works as an oxidizing and dehydrating agent.

Explanation:

Oxygen and hydrogen are the water elements made from nature

Answer:

3 elements:

Explanation:

H₂SO₄ is the chemical formula for Sulfuric Acid.

An element’s chemical symbol is a single capital letter or a capital letter followed by a lower case letter.

The subscript number after the element's symbol indicates how many of that atom are in the compound.  

Therefore:

(If there is no number after an element, assume there is one atom of that element).

Note:  If there is a number in front of the compound (the "coefficient"), multiply the subscript for each element by the coefficient.

Therefore, for H₂SO₄ there are:

The correct statements are Stony meteorites come from the outer layers of larger objects and Most meteors come from comets.

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Answer:

DNA, nucleus, chromosomes

Answer:

To add two non-collinear vectors, you first need to draw them on a coordinate plane so that their tails are at the same point. Then, you can use the "tip-to-tail" method to add the vectors. This involves drawing a vector from the tail of the first vector to the tip of the second vector, and this new vector is the sum of the two original vectors.

For example, if you have two non-collinear vectors, A and B, and you want to find their sum, you would first draw them on a coordinate plane so that their tails are at the same point. Then, you would draw a vector from the tail of vector A to the tip of vector B. This new vector, which is the sum of vectors A and B, is the result of adding the two vectors.

To calculate the sum of the vectors using the tip-to-tail method, you would simply add the x and y components of the two vectors separately. For example, if vector A has an x component of 3 and a y component of 4, and vector B has an x component of 5 and a y component of 6, the sum of the two vectors would be a vector with an x component of 8 and a y component of 10.

It's important to note that the sum of two non-collinear vectors is not necessarily a non-collinear vector. The sum of two non-collinear vectors can be a non-collinear vector, a collinear vector, or a zero vector (if the two original vectors are opposites of each other).

The energy needed is 35.4 KJ, to pop the corn of a given quantity, and by using latent heat of vaporization of water.

What is Energy?

When work is done and heat and light are produced, energy is the quantitative quality that is transferred to the body or to the physical system. The law of conservation of energy asserts that although energy can be changed in form, it cannot be created or destroyed. Energy is a conserved quantity.

Calculations:

The boiling point of water is 175 °C.

The mass of corn is 95.0 g.

The percentage of water in corn is 14%.

The latent heat of vaporization for water at 175 °C is 0.90 times its value at 100 °C.

Calculate the mass of water,

Mw = (14/100) × (95g) × (1kg/1000g)

      =  0.0133 Kg

calculate the latent heat of vapourization,

Lv = (0.9) × (2.26 × [tex]10^{6}[/tex]J/kg)

   =  2.034 × [tex]10^{6}[/tex] J/kg

Total heat required,

Q = Mw  Lv + Mw. C Δ T

Substitute the values,

Q = (0.0133) × (2.034 × [tex]10^{6}[/tex]) + (0.0133) × (4186) × (175.25)

  = (35403.27 J) × ( 1KJ/ 1000J)

  = 35.4 KJ

Hence, the energy needed is 35.4 KJ, to pop the corn of a given quantity.

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22.6m/s² will be the Acceleration needed by Elizabeth.

According to Newton's second law of motion, the force is equal to the product of the mass and acceleration of an object.

So the formula used will be,

F = ma

then, a = F/m

Where a is acceleration, F is force and m is the mass of the ball.

Then

a = 17/0.75 = 22.6

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Therefore, the large truck's net outward force is 88,060 lb. Its gauge pressure is 74 psi, and one tire's sidewall's total covered area is 1190 in2.

When compared to atmospheric pressure, gauge pressure is the amount of pressure. Gauge pressure is positive for pressure above atmospheric pressure and negative for pressures below it. In actuality, any fluid not contained in a rigid container will experience an increase in pressure due to atmospheric pressure. Because of Pascal's principle, this occurs. A diaphragm sensor can be used to measure gauge pressure, with one side of the diaphragm exposed to the pressure medium that needs to be measured and the other exposed to the surrounding atmospheric pressure.

Pg denotes gauge pressure, which has the following relationship to absolute pressure: Assuming that pa is the local atmospheric pressure, pg = p - pa. Example: The tire pressure is 32.0 psi, according to an automobile tire gauge. The surrounding atmosphere has a 14.2 psi pressure.

To monitor the pressure in a system as a quality control measure and to guarantee product consistency, pressure gauges are a crucial tool employed by industry. Pressure gauges keep an eye on the fluids, gases, and steam in a system to look for leaks or a buildup of pressure for safety reasons.

Gauge pressure = 74 psi

One sidewall area of tire = 1190 in2

Thus, the equation will be:

Net outward fore = Gauge pressure × Area of one sidewall of tire

Net outward force = 74 × 1190

Net outward force = 88,060 lb

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The kinetic energy of balls is conserved, the collision is elastic.

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Free fall motion is motion in which the only force acting on the body is gravity.

A free-falling object is one that moves only due to the effect of gravity, and its motion is defined by Newton's second law of motion. We can use algebra to calculate the acceleration of a free-falling particle.

The student should launch the sphere at 2v₀, for the sphere will land at approximately 1.41D, which is in the 3 point zone

The given parameter are;

The distance covered by the sphere when launched at height, H = D

The velocity with which the ball reaches D = v₀

The current available height of launcher= H/2

The available velocities = v₀, and 2v₀

Now,

From H = ut + (1/2)gt², where, initial velocity of the vertical motion of the ball, u = 0

we know;

H = (1/2)gt²

Therefore, the time it takes the ball to drop from H, t = √(2H/g)

The distance, D = v₀ × √(2H/g)

When the height is H/2, we get;

t = √(2H/(2g)) = √(H/g)

Thus, the distance covered, D₁ = v₀ × √(H/g)

Therefore, D = (√2) × v₀ × √(H/g) = (√(2))D₁

Now, D₁ = D/(√2) ≈ 0.71D

D₁ ≈ 0.71D

At speed 2v₀, we have;

D₂ = 2v₀ × √(H/g) = √2 × v2 × v₀ × √(H/g) = √2 × v₀ × √(2H/g) = √2D₁ ≈ 1.41D

D₂ ≈ 1.41D

The 2 point zone = D/2 < x < D = 0.5D < x < D (Position D₁ ≈ 0.71D is located here)

The 3 Point Zone =  D < x < 3D/2 = D < x < 1.5D (Position D₂ ≈ 1.41D is located here)

Given that at D₂, the ball lands in the 3 Point Zone, the student should launch the sphere at the speed, 2v₀, so that the ball will land at D₂ ≈ 1.41D,  which is in the 3 Point Zone

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The complete question is as follows:

A group of students prepare for a robotic competition and build a robot that can launch large spheres of mass M in the horizontal direction with variable speed and from a variable vertical position and a fixed horizontal position x=0.

The robot is calibrated by adjusting the speed at which the sphere is launched and the height of the robot’s sphere launcher. Depending on where the spheres land on the ground, students earn points based on the accuracy of the robot. The robot is calibrated so that when the spheres are launched from a vertical position y=H and speed v0, they consistently land on the ground on a target that is at a position x=D. Positive directions for vector quantities are indicated in the figure.

When the students arrive at the competition, it is determined that the height of the sphere launcher can no longer be adjusted due to a mechanical malfunction. Therefore, the spheres must be launched at a vertical position of y=H2. However, the spheres may be launched at speed v0 or 2v0.

Question: In a clear response that may also contain diagrams and/or equations, describe which speed, v0 or 2v0, the students should launch the sphere at so that they earn the maximum number of points in the competition.

When an object is placed 12 inches from the face, then the lens : will thicken and therefore refract light more strongly.

The process of changing the shape of the lens to focus on near or distant objects is called accommodation. To focus on a near object , lens becomes thicker which allows the light rays to refract more strongly.

Cornea provides most of the eye's optical power or light-bending ability. When the light passes through the cornea, it is bent again for more finely adjusted focus by the crystalline lens inside the eye. Lens helps in focusing the light on the retina.

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The minimum velocity the roller-coaster would need when going over the 13 m hill to make it to the top of the 26 m hill is 16.56 m/s.

Force is defined as the physical quantity or the power.

the normal force would havening  to point away from the group center of the curve. Unless they have belts, the riders will fall from the cars.

In a teardrop-shaped in the continuous loop the radius of curvature r decreases, causing them centripetal acceleration to increase. The speed would be  decrease as the car rises (because of gravity), but it is they are

overall by the effect is that the required centripetal force of the increases, meaning is the  normal force increased there is less danger if not to the  wearing a seat belt.

Suppose the minimum velocity is v.

Then mechanical energy at top of 13m hill is:

0.5 mv² + mgh

= 0.5 mv² + 15mg

g = 9.81 m/s/s (acceleration due to gravity).

All of this (assuming no loss due to friction) is converted to potential energy at top of 29m hill

So,

0.5 m v² + 15mg = 29mg

0.5 m v² = 14 mg

v² = (14 × 9.8)/0.5

v² = 274.4

v = 16.56 m/s

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Answer:

Explanation:f=ma. S=ut+at(t)/2

s=at(t)/2  2s/t(t)=a

f=m(2s)/t(t)

f(t)(t)/2m=s

40(2)(2)/2(10)=s

160/20=s

s=8m

b.w=f(s)

40(8)=w. W=320J

KE=m(v)(v)/2

V(V)=U(u)+2aS

kE=M[(U)(u)+2as]

u=0

KE=2mas.  KE=2(10)(4)(8). KE=640J

v(v)=u(u)+2as

v(v)=2(4)(8)

v(v)=64

v=8

Light is bent when it travels through a diamond. If the light rays is 12° and the incidence angle is 30°, the refraction is 2.4.

Light waves alter in speed as they pass across the boundary that separates two materials with distinct densities, such as air and glass. Refraction is the term for how they change direction as a result.

The rate at which light will change as it travels through one medium before entering another. As a result, refraction happens. The change in medium has an impact on how light passes through air and into water.

Briefing:

Snell's law states:

n₁sinθ₁ = n₂sinθ₂

n₂ = sinθ₁/ sinθ₂

n₂ = sin(30)/sin(12

n₂ = 2.4

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The rise in global temperatures over the last century can be explained by planetary motions that are false.

Global warming is an event where there is an increase in temperature in the atmosphere and the earth's surface (global temperature). An increase in temperature on earth will certainly have a considerable impact and cause a change in the ecological order of life.

Global warming occurs due to the process of increasing the average temperature of the atmosphere, sea, and earth's land. This phenomenon is triggered by human activities, especially those related to the use of fossil materials and land use change activities.

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The elastic potential energy will be =

For a)  7.5J

For d)  1687.5J

For g)  0.675J

For b) 11.718J

For e) 1267.5J

For h) 1080J

For c)  73507.5J

For f)  10.8J

For i)  18750J

According to the formula for calculating elastic potential energy,

Elastic potential energy (u) = 1/2 x spring constant x [tex](amount of extension)^{2}[/tex]

Let was calculate the value of 1/2 x spring constant to simplify the equation = 1/2 x 15 = 7.5

for a) 7.5 x [tex]1^{2}[/tex] = 7.5J

for d) 7.5 x [tex]15^{2}[/tex] = 1687.5J

for g) 7.5 x [tex]0.3^{2}[/tex] = 0.675J

for b) 7.5 x [tex]1.25^{2}[/tex] = 11.718J

for e) 7.5 x [tex]13^{2}[/tex] = 1267.5J

for h) 7.5 x [tex]12^{2}[/tex] = 1080J

for c) 7.5 x [tex]99^{2}[/tex] = 73507.5J

for f) 7.5 x [tex]1.2^{2}[/tex] = 10.8J

for i) 7.5 x [tex]50^{2}[/tex] = 18750J

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The rate at which the skiers accelerate is 2.7 m/s.

What is force?

A force applied to a body can change the magnitude of the momentum or its direction or both. Newton's second law is one of the most important in all of physics. For a body whose mass m is constant, it can be written in the form F = ma, where F (force) and an (acceleration) are both vector quantities.

What is Ma in force?
Newton's second law is often stated as F=ma, which means the force (F) acting on an object is equal to the mass (m) of the object times its acceleration (a). This means the more mass an object has, the more force you need to accelerate it. And the greater the force, the greater the object's acceleration.

[tex]F=ma[/tex]

Given : m=48+61, F=290N

[tex]290=(48+61)*a\\a=290/109\\a=2.7 m/s^{2}[/tex]

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According to astronomers, the whole universe started with a giant explosion called as Big Bang. Big Bang theory shows that the universe is extended from high density state. It says that universe is made up of a single point, which stretched and explodes out and is still stretching.

There are some evidences for big bang, they are:

1) There are some red shifts of different galaxies which means that the universe is expanding.

2) Due to the expanding of universe, some of the new elements are created like hydrogen, deuterium, etc.

3) Microwaves are detected by orbiting detectors.

Thus, these parameters show that Big Bang theory is correct.

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Nmr spectroscopy, or magnetic resonance spectroscopy, is a very important tool in the determination of organic structures.

What is NMR spectroscopy used for?
NMR spectroscopy is the use of NMR phenomena to study the physical, chemical, and biological properties of matter. Chemists use it to determine molecular identity and structure. Medical practitioners employ magnetic resonance imaging (MRI), a multidimensional NMR imaging technique, for diagnostic purposes.

How is NMR spectroscopy used in the identification of organic molecules?
Nuclear Magnetic Resonance (NMR) is an important technique to elucidate unknown organic molecules. But its sensitivity is limited and many elements lack an NMR observable isotope. So a full structure elucidation relies on several spectroscopic techniques and is normally performed by an experienced spectroscopist.

What type of radiation is used for NMR?
Like all spectroscopies, NMR uses a component of electromagnetic radiation (radio frequency waves) to promote transitions between nuclear energy levels (Resonance). Most chemists use NMR for the structure determination of small molecules.

This technique relies on the interaction of a particular nucleus with a field followed by the absorption of energy of a specific , depending on the chemical environment of the nucleus with a nuclear, magnetic field followed by absorption of energy of a specific frequency depending on the chemical environment of the nucleus.

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Carbonaceous Chondrites are rich in volatiles and thus provide the best samples of the solar nebula.

Meteorites may contain roughly spherical particles called “chondrules”, and these meteorites are accordingly called “chondrites.”

Chondrites which are often porous in structure and tend to be quite dark due to a large presence of organic, i.e., carbon-containing, substances, are called “carbonaceous chondrites.”

All Carbonaceous chondrites are rather porous and contain significant amounts of water and organic substances. So, they are rich in volatiles.

Carbonaceous chondrites are considered to be the most primitive objects in the solar system, and they can provide valuable insights into the conditions that existed during the very earliest days of the solar system. So, they are the best samples of the solar nebula.

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