a car starts from rest and accelerates to a speed of 30 m/s in a time of 3 seconds. the average acceleration of the car is

Answer:

C.Forced air

Explanation:

HVAC system

"By far the most common HVAC system in modern North American homes is the forced-air system that uses a furnace with a blower fan that delivers warmed air to the various rooms of the home through a network of ducts."

So can you please mark me brainliest?

The greatest static resistance between the upper and lower block is f1max = f 1max = s m 1g = 0.6×2×10 = 12N.

According to Newton's second law of motion, an object's net force must equal the sum of its mass and the acceleration it experiences. In the direction of the net force is where acceleration is moving.

The force of action and reaction between two bodies is equal in magnitude but opposite in direction, according to Newton's third law of motion. The highest frictional force that prevents slippage on a surface is known as the limiting friction force.

The highest static resistance between the lower block and the ground is

f2max

​ =μ s (m 1 +m 2 )g=0.6(2+2)10

=24N

Assumedly, both blocks move to the right at the same speed.

Consequently, (m 1 + m 2 )a = T- μk (m1 + m2)g

or 4a = T - 0.4(2+2)10

or a = T-16 / 4

for upper block, f1 = 2a = T - 16 / 2

For just sliding, f1 = f1max

or T - 16 / 2 = 12

or T - 16 = 24 => T = 40N

The complete question is:

You are lowering two boxes, one on top of the other, down the ramp by pulling on a rope parallel to the surface of the ramp. Both boxes move together at a constant speed of 15.0 cm/s. The coefficient of kinetic friction between the ramp and the lower box is 0.441, and the coefficient of static friction between the two boxes is 0.834. (a) What force do you need to exert to accomplish this? (b) What are the magnitude and direction of the friction force on the upper box?

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It moves at a constant linear speed around it. Yet, the linear velocity at any point on the blades is constantly varying and accelerating.

Acceleration typically indicates a change in speed, but not necessarily. An item that follows a circular course while maintaining a constant speed is still moving forward because the direction of its motion is shifting.

Most likely, you picture something racing up when you think about acceleration. But a moving thing accelerates as it slows down. A change in speed is what acceleration is, so keep that in mind. The speed of a car that is slowing down decreases.

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Answer:

Wavelength is the distance fromone crest to another or from one troughtto another of a wave is called wavelength.

(a) The maximum capillary rise of water to be expected in the glass tube is 30 mm.

(b) The maximum capillary rise of water to be expected between the  concentric glass tube is 30 mm.

The maximum capillary rise in the glass tube is calculated as follows;

\(h = \frac{2Tcos(\theta)}{r\rho g} \\\\\)

where;

\(h = \frac{2 \times 0.0735 \times cos(0)}{0.5 \times 10^{-3} \times 1000 \times 9.8} \\\\h = 0.03 \ m\\\\h = 30 \ mm\)

distance between glass tubes = 5 mm - 4 mm = 1 mm

radius of the glass = 0.5 mm

Maximum capillary rise =  30 mm

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Answer:

i got you there

Explanation:

the kinetic theory is that what ever that is in motion stays in motion

Answer:

longitudinal wave

OK hope this will help you

Answer:

T = mg / cos θ

ac = g tan θ

Explanation:

Draw a free body diagram. There are two forces acting on the pendulum bob. A tension force T acting θ from the vertical, and gravity pulling down.

Sum the forces in the y direction:

∑F = ma

T cos θ − mg = 0

T = mg / cos θ

Sum the forces in the centripetal direction (towards the center).

∑F = ma

T sin θ = m ac

ac = T sin θ / m

Substitute for tension T:

ac = (mg / cos θ) sin θ / m

ac = (mg / m) (sin θ / cos θ)

ac = g tan θ

Answer:C.

Explanation:

The rate of change in velocity; speeding up, slowing down, or changing direction

Answer:

Im pretty sure 1 is gravity, 2 is force

Explanation:

Degeneracy pressure stops the crush of gravity in all the following except a brown dwarf. The correct option is a.

Electron degeneracy pressure is a subset of the broader phenomenon of quantum degeneracy pressure.

The Pauli exclusion principle prevents two identical half-integer spin particles from occupying the same quantum state at the same time.

Electron degeneracy pressure, in particular, is what protects white dwarfs from gravitational collapse, as well as the Chandrasekhar limit (the maximum mass a white dwarf can attain) arises naturally as a result of electron degeneracy physics.

Thus, the correct option is a.

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Answer:

B

Explanation:

Eff = output work/input work ×100

Hence, Eff = 10000/12000 × 100

Eff = 83.3%

The macro scale look of the lake is determined by water molecules.

The macro scale refers to the broad scale motion of the gas, while the micro scale refers to individual molecule movements.

The macroscale is defined as geometry on the order of millimeters and beyond, whereas the microscale is concerned with length scales down to the micrometer range.

The biggest circulation patterns in the earth's lower atmosphere are represented by macroscale winds. These wind patterns can endure from days to months and span distances of hundreds to thousands of kilometers.

The jet stream and trade winds are two examples of planetary scale wind patterns.

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Full Question:

Although part of your question is missing, you might be referring to this full question:

How can the change that the molecular scale affect the Lakes Macro scale appearance

Sampling is the process of selecting a subset of individuals or items from a larger population in order to gather information or make inferences about the whole population. This method allows researchers to collect data from a smaller group, which is more efficient and cost-effective than collecting data from the entire population.

Sampling is a crucial process in research because it helps ensure that the data collected is representative of the population and reduces the potential for bias. There are several types of sampling methods, including random sampling, stratified sampling, and convenience sampling. The choice of sampling method depends on the research question, the population being studied, and the resources available to the researcher. The accuracy of the data obtained from a sample depends on the sample size and the sampling method used. A larger sample size is generally more representative of the population and reduces the margin of error, while a smaller sample size may be more susceptible to sampling bias.

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There are three factors that affect gravitational potential energy:

Gravitational potential energy is potential energy an object holds when falls towards another object due to gravity.

for instance, if we lift a stone and try to throw it from a height, it will have gravitational potential energy whereas stones in the ground have no gravitational potential energy.

the formula of GPE:  E = mgh where

m = mass, g = gravity and h = height

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Answer:

30m/s

Explanation:

Use the formula

V= d /t

Answer:

Explanation:

A simple pendulum consists of a mass (usually represented as a small object or bob) attached to a string or rod of negligible mass. The mass is free to swing back and forth under the influence of gravity.

In the figure, the point of suspension is denoted by "O," and the mass (bob) is represented by the small circle. The string or rod is represented by the vertical line connecting the point of suspension to the bob.

Amplitude:

The amplitude of a pendulum refers to the maximum displacement or swing of the bob from its equilibrium position. In the figure, the amplitude can be represented by the angle formed between the vertical position and the position of the bob when it swings to its maximum distance on one side. It is usually denoted by the symbol "A."

Effective Length:

The effective length of a pendulum refers to the distance from the point of suspension to the center of mass of the bob. It represents the distance over which the mass swings back and forth. In the figure, the effective length can be measured as the length of the string or rod from the point of suspension to the center of the bob. It is usually denoted by the symbol "L."

It is important to note that the amplitude and effective length of a simple pendulum affect its period of oscillation (the time taken for one complete swing). The relationship between these parameters and the period can be described by mathematical formulas.

Overall, the simple pendulum is a fundamental concept in physics and provides a simplified model for understanding oscillatory motion and the principles of periodic motion.

Answer:

b might be correct

Explanation:

because alcohol react complete different manner in presence of catlyst

Answer:

a

Explanation:

When exposed to hotter conditions, the particles within the magnet are moving at an increasingly faster and sporadic rate. This misaligns the particles, causing the magnetism to be lost.

Answer:

Pressure is inversely proportional to Area ...

P = F/A

Answer:

Hence, pressure is inversely proportional to the area of contact. Additional information: In the SI unit system, the unit of force is Newton and the unit of area is square-meter. Atmospheric pressure can be defined as the pressure given by the atmosphere of earth near the surface or at sea level.

The statement that is true regarding celiac disease is option (C) Individuals with Celiac disease must avoid gluten in order to prevent their body's immune system from attacking the absorptive cells in their intestine

Celiac disease is an autoimmune disorder in which the immune system reacts to gluten, a protein found in wheat, barley, and rye, causing damage to the lining of the small intestine.

There is no medication to completely reverse celiac disease, and the only effective treatment is a strict gluten-free diet. Rice and other cereal grains are naturally gluten-free and can be safely consumed by individuals with celiac disease, as long as they are not contaminated with gluten during processing or preparation.

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The given question is incomplete, the complete question is:

Which of the following statements is TRUE regarding celiac disease?

A. Celiac disease can be completely reversed with medication

B. Celiac disease is a type of food allergy in which a person experiences an allergic response to gluten

C. Individuals with Celiac disease must avoid gluten in order to prevent their body's immune system from attacking the absorptive cells in their intestine

D. Individuals with celiac disease must avoid rice and other cereal grains

The decrease in kinetic energy in moving from point O to point P isΔK = 1/2mv'² - 1/2mv².

m = mass of the object

g = acceleration due to gravity

h = height of the object above the lowest point on the circle

v = velocity of the object at point O

Final energy (Ef) at point P can be expressed as

Ef = mgh' + 1/2mv'²

Where,h' = height of the object above the lowest point on the circle

v' = velocity of the object at point P

Total mechanical energy at point O can be given as

Ei = mgh + 1/2mv²

And, Total mechanical energy at point P can be given as

Ef = mgh' + 1/2mv'²

As we know, the total mechanical energy of the system remains constant.

Ei = Ef

=> mgh + 1/2mv² = mgh' + 1/2mv'²

As the object moves from point O to point P, the height of the object increases and the speed of the object decreases such that the object-earth system’s total mechanical energy remains constant.

The decrease in the kinetic energy can be given as the difference in the kinetic energies at point O and point PΔK = Kf - Ki

Where,Kf = final kinetic energy

Ki = initial kinetic energyInitial kinetic energy at point O is given aski = 1/2mv²Final kinetic energy at point P is given ask

f = 1/2mv'²

Therefore,ΔK = Kf - KiΔK = 1/2mv'² - 1/2mv²

So, the decrease in kinetic energy in moving from point O to point P isΔK = 1/2mv'² - 1/2mv².

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Answer:

22 m/s at 3 seconds

Explanation:

acceleration is 4m/s^2 before 3 seconds

4*3 = 12

add current speed

10+12=22

To determine the magnitude of the electric field at a point 2.5 cm from the center of the aluminum ball, we will need the following information:

1. The charge (Q) of the aluminum ball in coulombs (C)
2. The distance (r) from the center of the aluminum ball to the point where we want to find the electric field (in meters)


The formula to calculate the electric field (E) is given by Coulomb's Law:

E = k * Q / r²

where,
- E is the electric field (in newtons per coulomb, N/C)
- k is the electrostatic constant (approximately 8.99 × 10^9 N·m^2/C^2)
- Q is the charge of the aluminum ball (in coulombs, C)
- r is the distance from the center of the aluminum ball to the point of interest (in meters)


To proceed with the calculation, please provide the charge (Q) of the aluminum ball. Note that the distance (r) should be converted from centimeters to meters:

r = 2.5 cm × (1 m / 100 cm) = 0.025 m

Once you have the charge (Q), you can use the formula above to find the magnitude of the electric field at the point 2.5 cm from the center of the aluminum ball.

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Answer:

Momentum of car = 1200 kg * 10 m/s = 12000 kgm/s Momentum = Force * time 12000 kgm/s = Force * 20s Force = 600 N

Explanation:

Answer with Explanation:

Spain is known to have hot summers, thus, it is very easy for water to evaporate once exposed to direct heat source (such as the sun).

A fountain is being used in order to keep the garden's surrounding air temperature low by allowing the evaporation of water. One factor that speeds up the evaporation of water is the surface area. The water coming out of a fountain is in small quantities; however, it meets up with hot air in a large surface area. This allows faster evaporation, leading to an even greater cooling effect because heat is being transported immediately from the liquid state to the gaseous state. This is the reason why people often meet up in places where there's a fountain. It is not only aesthetically appealing but also provides comfort from the heat.

Answer:

I think it is A

Explanation:

The location in this diagram do the magnetic field lines show that the magnetic field is strongest is in C and wekeness in D.

The lines representing the magnetic field are closed, that is, they have no beginning or end. This can be observed when we place iron filings on a sheet of paper, over a bar magnet: the pattern of lines formed continues on the part of the paper that is on the magnet, closing.

In the region of the poles we see that the lines of magnetic induction are closer to each other, therefore, we consider that close to the poles the magnetic field is more intense. In this case it is stronger in C and weaker in D.

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Answer:

The strongest is C

Explanation:

Just took the test and got it right, I don't need to over-explain it

Answer:

Tornadoes

A tornado is a violently rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloudExplanation:

Newton's second law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. In other words, the larger the net force acting on an object, the greater its acceleration, and the larger the object's mass, the smaller its acceleration for a given force.

When a weight is placed over a pulley, the net force acting on it is equal to the weight of the object, and the acceleration of the object depends on its mass. However, if the weight over the pulley is not constant, the net force acting on the object changes, which affects its acceleration.

For example, if the weight over the pulley increases, the net force acting on the object also increases, and the object's acceleration increases. Conversely, if the weight over the pulley decreases, the net force acting on the object decreases, and the object's acceleration decreases.

Keeping the weight over the pulley constant ensures that the net force acting on the object remains constant, which allows for accurate and predictable calculations of the object's acceleration. This is especially important in scientific and engineering applications where precise measurements and calculations are necessary.

Therefore, it is important to keep the weight over the pulley constant to ensure that Newton's second law of motion can be applied accurately and consistently.

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