A baseball is moving in the air along the customary parabola. Ignoring air drag, where is the force on the baseball zero?A. at the top of the parabolaB. just when it has started upwardC. where it is about to impactD. nowhere

If the speed of an object does not change the object Is traveling at a constant speed

Answer:

Explanation:Wave length of a sound wave = speed / frequency1) 340 m/s / 880 Hz

Answer:

0.386m

Explanation:

                       Speed

Wavelength = -----------------

                       Frequency

                       340m/s

Wavelength = -------------- = 0.386m

                       880 Hz

What is average speed?

Average velocity is outlined because the amendment in position or displacement (∆x) divided by the time intervals (∆t) within which the displacement occurs.

The average velocity will be positive or negative relying upon the sign of the displacement. The SI unit of average velocity is meters per second (m/s or ms-1).

For a suction velocity of Vw = 0.15 m/s

Cylindrical suction expanse.

Aw = 2π (0.04) (1.2) = 0.30 lbm2

Q1 = Qw+Q1

(12* π * (0.08)2 / 4 = (0.15)(0.30) + V2 π

(0.08)2 / 4

V2 = 3 m/s

Hence, the exit velocity is Vw = 0.15 m/s

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Answer: no exact answer

=

Explanation:

Answer:

2) same size, same distance away from the mirror

Explanation:

The image formed by a plane mirror has the same size and it is at the same distance of the object. It is also reversed from left to right. So, the size and position of an image formed by a plane mirror are

2) same size, the same distance away from the mirror

Answer: Inertia is an object’s resistance to a change in its motion. The greater the mass of an object, the greater the force needed to move it or stop it from moving.

Explanation: Hope this was helpful

Question 1.

now, we know :

=》

\(p.e = mgh\)

=》

\(67500 = 4500 \times 10 \times h\)

=》

\(67500 = 45000 \times h\)

=》

\(h = \dfrac{67500}{45000} \)

=》

\(h = 1.5 \: m\)

note : if we take acceleration due to gravity as 9.8, then height = 1.53 m

Question 2.

we know,

=》

\(k.e = \dfrac{1}{2} mv {}^{2} \)

=》

\(63000 = \dfrac{1}{2} \times 4500 \times {v}^{2} \)

=》

\( {v}^{2} = \dfrac{63000 \times 2}{4500} \)

=》

\( {v}^{2} = 28\)

=》

\(v = \sqrt{28} \)

=》

\(v = 2 \sqrt{7} \: \: ms {}^{ - 1} \)

or

=》

\(5.29 \: \: ms {}^{ - 1} \)

\(\text{Given that },\\\text{Mass, m = 6 kg}\\\\\text{Acceleration, a = 6 } \text{m} \text{s}^{-2}\\\\\text{Time, t=9 sec}\\\\\text{Displacement, }s=ut + \dfrac 12 at^2 = \dfrac 12 at^2 = \dfrac 12 \times 6 \times 9^2 = 243 ~m}\\\\\ \text{Work,} ~W = Fs = mas = 6 \times 6 \times 243 = 8748 ~ J}\)

Hi there!

We know that:

\(W = \Delta KE = \frac{1}{2}m(\Delta v)^2\)

We can begin by solving for the final velocity using the equation:

\(v_f = v_i + at\)

The box starts from rest, so:

\(v_f = at\\\\v_f = 6(9) = 54 m/s\)

Now, we can find the kinetic energy:

\(KE = \frac{1}{2}mv^2\\\\KE = \frac{1}{2}(6)(54^2) = 8748 J\)

Thus:

\(W = \Delta KE\\\boxed{W = 8748 J}\)

Answer:

68.2 Quadrillion meters

Explanation:

A lightyear is the distance that light travels in one year.

Speed of light is \(3*10^8\ m/s\)

So light covers 300,000,000 meters in one second.

One year has 31536000 seconds so , light covers

\(9.461*10^{15}\ meters\ in\ one\ year\)

so 7.2 light years is

\(7.2*(9.461*10^{15})\\6.82*10^{16}\)

so 7.2 light years is

6.82 x 10^(16) meters or

68.2 Quadrillion meters

The friction between the two solid surfaces depends on the weight of the objects on the surface and the roughness of the object surfaces.

When the two bodies are in contact such that a force acts to restrict the motion of each body, then the force is known as frictional force. And the phenomenon is called friction.

The expression for the frictional force is given as,

\(F = \mu \times N\)

Here,

\(\mu\) is the frictional coefficient and N is the normal reaction. (N = mg)

Clearly, the frictional force is dependent on the frictional coefficient of the surfaces and in turn, depends on the roughness of object surfaces. Also, friction depends on a normal reaction whose value is equivalent to the weight of objects on the surface.

Thus, we can conclude that the friction between the two solid surfaces depends on the weight of the objects on the surface and the roughness of the object surfaces.

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Answer:

A,d

Explanation:

the weight of the objects and the roughness of the objects’ surfaces i took the test

Answer:

0.16239316239316239316239

Explanation:

ang haba nang solve ko dito hehe

Compared to the impulse provided to clay, the superball receives a stronger impulse.

The quantity of impulse is influenced by the amount and duration of applied force. The change in momentum that an item experiences is represented by the impulse.

Both the clay and the superball feel an impulse during a contact, but the size of the impulse is determined by the forces and their duration.

The superball suffers a larger force and a longer duration of force during the contact since it is comprised of a material that is very elastic. As a result, the superball receives a stronger impulse.

The clay, on the other hand, is formed of a substance that is extremely inelastic, which results in a lesser force and a shorter duration of force during the contact.As a result, the impulse that reaches the clay is reduced.

As a result, when the superball collides with the scale, it generates a larger impulse than when clay collides with the scale.

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It is important to note that the debate between scientific realism and antirealism is ongoing and complex, with various nuances and perspectives within each position. Different philosophers of science and scientists may hold different views on the nature of scientific terms and their relationship to reality.

According to a scientific realist perspective, scientific terms for unobservable phenomena such as "atom" and "black hole" are seen as referring to entities that truly exist in reality. Scientific realists believe that scientific theories and concepts accurately capture aspects of the world, including unobservable entities and phenomena. They argue that scientific theories provide the best explanation of the natural world and aim to describe the underlying structure and mechanisms of reality.

On the other hand, scientific antirealists hold a different view. They argue that scientific terms that refer to unobservable phenomena do not necessarily correspond to something that exists independently in reality. Antirealists often emphasize the instrumentalist view of science, which suggests that scientific theories are simply tools or frameworks that help us organize and predict observable phenomena, without making claims about the ultimate nature of reality.

Antirealists may argue that scientific theories are subject to revision and change over time as new evidence emerges, suggesting that the terms used to describe unobservable phenomena are not fixed and may not have a one-to-one correspondence with actual entities in reality. They may also highlight the role of social and cultural factors in shaping scientific knowledge, suggesting that scientific terms are influenced by human conventions and interpretations.

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Option B; In a mechanical wave, the restoring force is the force that actually causes the oscillation opposite the direction of the displacement from equilibrium.

Oscillation is the repeating or periodic oscillation of a quantity, often in time, around a central value (often an equilibrium point) or between two or more states. A swinging pendulum and alternating current are two common examples of oscillation. Physics can employ oscillations to simulate intricate interactions, as those between atoms.

The beating of the human heart (for circulation), business cycles in economics, predator-prey population cycles in ecology, geothermal geysers in geology, the vibration of the strings in guitars and other string instruments, the periodic firing of nerve cells in the brain, and the periodic swelling of Cepheid variable stars in astronomy are just a few examples of the dynamic systems that exhibit oscillations in nearly every branch of science.

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This is due to the fact that occluded fronts combine two cold air masses, which causes one of the cold air masses to go downward.

When a warm air mass is sandwiched between two cold air masses, an occluded front occurs. In an occlusion, the warm front passes over the cold front, which dives beneath it.

In a front is obscured, the warm front is fully supplanted by the cold front, in which the warm air masses have completely disappeared. Furthermore, there are frequent shifts in the various weather producing circumstances because of the cold front's relatively low temperature.

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Answer:

the correct answer is :

heat produced = I^2RT

Answer:

The electric charge on the brush is now positive. This means that if the object it light enough (like a balloon) it would stick to the wall.

This is fun science actually.

Explanation:

May I have brainliest please? :)

Your answer is C. I hope this helps you.

Answer:

wood

Explanation:

Answer:

A crossroads of trade is a place where many trade routes converge, often leading to the exchange of goods and ideas between different cultures. Historically, cities and towns located at crossroads of trade have been important centers of commerce and cultural exchange. For example, the ancient city of Alexandria in Egypt was a crossroads of trade between Europe, Africa, and Asia, and played a key role in the exchange of goods and ideas between these regions. In modern times, cities such as Dubai and Singapore have become important crossroads of trade due to their strategic location and well-developed infrastructure for transportation and logistics.

The two main mechanisms involved in sea level rise are thermal expansion and the melting of land-based ice. Hard defenses can provide protection against rising sea levels and coastal erosion for the communities located directly behind them, they can have potential impacts on neighboring communities.

As the Earth's oceans absorb heat from the atmosphere, the water expands thermally, leading to an increase in sea level.

Melting of land-based ice refers to the melting of glaciers and ice sheets, such as those in Greenland and Antarctica.

Under the RCP8.5 scenario, which represents a high greenhouse gas emissions trajectory, the dominant mechanism of sea level rise is expected to be the melting of land-based ice.

The increased temperature and subsequent accelerated melting of ice sheets and glaciers would contribute significantly to rising sea levels.

Hard defenses can provide protection against rising sea levels and coastal erosion for the communities located directly behind them, they can have potential impacts on neighboring communities.

Some of these impacts include Increased erosion, altered wave patterns, loss of coastal access, coastal squeeze, and visual and aesthetic impact.

It is essential to consider these potential impacts on neighboring communities when evaluating the suitability and long-term effects of implementing sea walls as coastal protection measures.

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The heat flux from the second airfoil is q=1260 Btu/h-ft . The negative sign indicates that heat is being transferred from the airfoil to the surrounding air.

The heat flux from the second airfoil can be determined using the equation:
q = h × (Tsurface - Tfree stream)
where q is the heat flux, h is the convection heat transfer coefficient, Tsurface is the constant surface temperature of the airfoil, and Tfree stream is the free stream temperature.
For the first airfoil with a characteristic length of L=0.2 ft, the free stream velocity is V=150 ft/s. Therefore, the free stream temperature can be calculated using the formula:
T_free stream = T + (V² / 2×Cp)
where Cp is the specific heat capacity of air at constant pressure.
Substituting the given values, we get:
T_free stream = 60F + (150² / 2×0.24) = 578.75F
Using this value and the given convection heat transfer coefficient of h=21 Btu/h-ft2.oF, we can calculate the heat flux for the first airfoil as
q_1 = 21 × (180 - 578.75) = -8433.75 Btu/h-ft
Note that For the second airfoil with a characteristic length of L=0.4 ft, the free stream velocity is V=75 ft/s. Using the same formula as before, we can calculate the free stream temperature as:
T_free stream = 60F + (75² / 2×0.24) = 325.78F
Using the same constant surface temperature of T=180F and the given convection heat transfer coefficient of h=21 Btu/h-ft2.oF, we can calculate the heat flux for the second airfoil as:
q_2 = 21 ×(180 - 325.78) = 1260 Btu/h-ft

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Answer:

IMA = 2.5 metres

EFFICIENCY = 80%

Explanation:

The AMA of a machine is referred to as the Actual Mechanical Advantage of a machine, calculated as the ratio of the output to the input force.

The Ideal Mechanical Advantage is the ratio of the input distance to the output distance.

From the diagram, the input distance which is also the distance moved by effort  = 5metres

The load distance (output distance) = 2 metres

IMA = INPUT DISTANCE / OUTPUT DISTANCE

IMA = 5metres / 2 metres = 2.5 meters

Efficiency is the ratio of AMA TO IMA

AMA = 2, IMA = 2.5

EFFICIENCY = AMA / IMA

EFFICIENCY = (2 / 2.5) × 100%= 0.8 × 100%

EFFICIENCY = 80%

"The proper way to name the range of cells located in column A row 3 through column C row 7 is A3:C7."

Each worksheet is composed of countless cells, which are rectangular shapes. A cell is the place where a row and a column meet, or the intersection of a row and a column.

A, B, and C are used to identify columns, while digits are used to identify rows (1, 2, 3). Based on its column and row, each cell has a unique name or cell address. The cell address in the example below is C5, because the chosen cell intersects column C and row 5.

Additionally, it is possible to select many cells at once. A cell range is a collection of cells. You will refer to a cell range using the cell addresses of the first and last cells in the range, separated by a colon, rather than a single cell address. Cells A1, A2, A3, A4, and A5 would be included in the range represented by the letters A1:A5.

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Answer:

P V = N R T

P V = constant if temperature and number of moles of gas are constant

P2 / P1 = V1 / V2

The pressure of the gas in the balloons will be much smaller than the pressure of the gas in the tank - so a small volume of gas can be used to fill a much larger volume at lower pressure

Answer:

Yes

Explanation:

Because putting them together would make a type of energy making the answer yes

"Most of the moons of Saturn have rocky, cratered surfaces, like Deimos and Phobos." False.

The majority of Saturn's moons, including its biggest moon Titan, have unique surface characteristics and compositions. While many moons exhibit a diversity of geological features, some moons, like Enceladus and Mimas, do have highly cratered surfaces. For instance, Titan possesses a dense atmosphere, methane lakes, and intricate geological structures.

Actually, Deimos and Phobos are moons of Mars rather than Saturn. They resemble some of Mars' moons but not Saturn's; they are small, asymmetrical moons with highly cratered surfaces.

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Answer:

The Event Horizon Telescope (EHT) made history by capturing the first-ever image of a black hole in 2017. This monumental achievement provided astronomers and scientists with a groundbreaking glimpse into the mysterious phenomenon of black holes.

Explanation:

To obtain the image, the EHT utilized a technique called Very Long Baseline Interferometry (VLBI), which involved coordinating a global network of radio telescopes to work together as a single virtual telescope. By synchronizing the data collected from these widely dispersed telescopes, the EHT achieved an incredibly high-resolution image.

The observations necessary for creating the image of the black hole were not limited to a single night in 2017. Instead, the data collection process spanned several nights over the course of that year. The EHT team synchronized and combined the observations from different telescopes to form a cohesive dataset, enabling the creation of the final image.

By observing the target black hole—specifically, the supermassive black hole at the center of the galaxy Messier 87 (M87)—over multiple nights, the EHT team was able to gather a more extensive dataset. This prolonged observation period increased the chances of capturing clear and accurate data, compensating for potential adverse weather conditions or technical challenges on any given night.

Overall, the observations made by the Event Horizon Telescope in 2017 were spread out across several nights to ensure the collection of sufficient data and enhance the accuracy of the resulting image. The collaborative effort and meticulous data analysis led to the groundbreaking achievement of capturing the first-ever direct image of a black hole.

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