Which of the following describes the structure of an airplane wing?

A. To help the airplane change directions
B. Smooth, wide shape with a curved edge
C. To lift the airplane off the ground
D. Flat, thin metal with silver stripes

Sound intensity is inversely proportional to the square of the distance traveled by the sound.

Sound, a mechanical disturbance from a state of equilibrium that propagates through an elastic material medium. The sound travels in all the mediums i.e. solid, liquid, and gas.

According to the question, the sound frequency which he is hearing is 20dB when he is standing 8m away from the engine.

Sound intensity is inversely proportional to the square of the distance traveled by the sound. Thus;

r1^2 divide by r2^2 = L2divideL1

where r= distance (m)

L= sound intensity (decibel dB)

8squared divide by 4 squared = L2 divide 20 dB

L2 = 4 × 20

L2= 80 dB

This means that the sound is increased from 20 dB to 80 db.

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Answer:

cc

Explanation:

Answer:

The atomic number of phosphorus is 15.

Explanation:

It’s found after Si(Silicon) and before S(sulphur)

Answer: A.

Explanation: I actually did research on this question and it told me about directions so I hope this was correct.

Answer: 0.99m left

Explanation:

The formula:

Distance / Time = Rate

Fill in the formula

Distance / 0.55s = 1.8 m/s

Multiply both sides by 0.55s

Distance = 0.99m

Displacement = 0.99m to the left.

Answer:

-0.99 (See attached)

Explanation:

(See attached)

Explanation:

FALSE

The first periodic table of elements Mendeleev created contained 63 elements.

Answer:

Electrolytic manganese dioxide (EMD) is used in zinc-carbon batteries together with zinc chloride and ammonium chloride. EMD is commonly used in zinc manganese dioxide rechargeable alkaline (Zn RAM) cells also. For these applications, purity is extremely important.

Explanation:

hope this helps...

Answer:

The not alligator side.

Obviously the middle, both sides will be shallow, so the middle will most likely  be the deepest part.

Explanation:

280N(Newton) of force would it take to push another, larger friend who has a mass of 70g to accelerate at the same rate of 4 m/s².

A force is an influence that has the power to alter an object's motion. A force can cause an object with mass to accelerate when it changes its velocity, for as when it moves away from rest. An obvious way to describe force is as a push or a pull.

A force is a vector quantity since it has both magnitude and direction. It is calculated using the newton SI unit (N). Force is denoted by the letter F.

Force = Mass * Acceleration

          = 70 g * 4

          = 280 Newton.

Therefore, 280N(Newton) of force would it take to push another, larger friend who has a mass of 70g to accelerate at the same rate of 4 m/s².

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Answer:

Since (average) acceleration = (change in velocity)/(time it takes), the car's acceleration = (100 km/h)/(10 s) = 10 km/h/s. This means that, on the average, the car's velocity changed by 10 km/h each second.

Explanation:

the answer would be microwaves!

Answer:

Microwaves

Explanation:

Explanation:

Answer:

umm.....the teachers and friends

The drama, and friends.

A 20.0 kg cannonball is fired from a cannon with a muzzle speed of 100 m/s at an angle of 20.0°. Using conservation of energy, the maximum height reached by the cannonball is approximately 510.2 meters.

A cannon ball weighing 20.0 kg is launched from a cannon with an initial velocity of 100 m/s at an angle of 20.0° above the horizontal.

To determine the maximum height reached by the cannonball using the conservation of energy principle, we consider the conversion of kinetic energy into gravitational potential energy.

Initially, the cannonball has only kinetic energy, given by the equation KE = (1/2)mv², where m is the mass and v is the velocity.

At the highest point of its trajectory, the cannonball has no vertical velocity, meaning it has no kinetic energy but possesses gravitational potential energy, given by the equation PE = mgh, where h is the height and g is the acceleration due to gravity (approximately 9.8 m/s²).

Using the conservation of energy, we equate the initial kinetic energy to the maximum potential energy:

(1/2)mv² = mgh

Canceling the mass and rearranging the equation, we find:

v²/2g = h

Plugging in the given values, we have:

(100²)/(2*9.8) = h

Simplifying the equation, we find:

h ≈ 510.2 m

Therefore, the maximum height reached by the cannonball is approximately 510.2 meters.

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Answer:

Initial velocity (u) = 40 m/s

Distance travel in last 5 seconds = 100 m

Explanation:

Given:

Acceleration (a) = 8 m/s²

Final velocity (v) = 0 m/s

Find;

1] Initial velocity before 5 sec

2] Distance travel in last 5 seconds

Computation:

1] Initial velocity before 5 sec

v = u + at

0 = u + (-8)(5)

u - 40 = 0

Initial velocity (u) = 40 m/s

2] Distance travel in last 5 seconds

s = ut + (1/2)(a)(t²)

s = (40)(5) + (1/2)(-8)(5²)

s = 200 - 100

Distance travel in last 5 seconds = 100 m

Answer:

this seems to not be worded right

Explanation:

An appropriate speed for glacial movement generally is six centimeters a year.

A glacier is a vast, slow-moving mass of snow and ice that collects in mountain valleys and spreads outwards, frequently flowing like a very slow river. It forms when snow accumulation exceeds snowmelt, and the compacted snow transforms into ice, a process known as "firnification." This ice subsequently flows downhill under the weight of additional snow accumulation, occasionally for hundreds of miles.

Glaciers can move up to several meters per day, but they typically move at a much slower pace. Even though the speed of a glacier might vary widely based on factors like slope, basal conditions, temperature, and ice thickness, a reasonable speed for glacial movement is six centimeters a year. Furthermore, the rate of movement can vary depending on the time of year and the time of day.

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Ancient astronomers often had difficulty explaining retrograde motion, the occasional westward motion of the planets.

For example, Mars appears to be in retrograde motion when Earth catches up to and passes it in orbit. The illusion of backward motion arises as a result of this. Since ancient astronomers did not understand the true nature of planetary motion, they believed that the planets orbited the Sun in circular paths at a constant rate. When planets such as Mars and Jupiter moved retrograde, they were believed to be moving backwards across the sky.

This notion, however, was flawed, and the true explanation was not discovered until the sixteenth century when Copernicus proposed a heliocentric model of the solar system. Ancient astronomers often had difficulty explaining retrograde motion, the occasional westward motion of the planets.

Retrograde motion is an optical illusion caused by the relative positions of Earth and other planets in the solar system. Retrograde motion is the most unusual planetary motion that ancient astronomers had ever witnessed and researched. This motion refers to the occasional westward movement of the planets in the sky, which was confusing for astronomers to explain.

Ancient astronomers believed that the planets followed a fixed circular orbit at a steady rate around the sun. However, during certain times of the year, the planets would change their course and appear to move backward, causing confusion and amazement among ancient astronomers

. Retrograde motion is an optical illusion caused by the relative position of Earth and other planets in the solar system, and it is usually observed during a planet's opposition, which occurs when the Sun, Earth, and a planet align in a straight line with Earth in the middle. In 1543, Copernicus proposed a new model of the solar system that demonstrated that the planets, including Earth, revolve around the Sun.

This Copernican system explained retrograde motion as a result of the relative motion of Earth and other planets. Since then, new technology has allowed scientists to explore the mysteries of space in greater depth, and they have discovered that retrograde motion is not unique to the planets but also affects asteroids, comets, and other celestial bodies.

In conclusion, ancient astronomers had difficulty explaining retrograde motion, and it was only after Copernicus proposed his heliocentric model that the real explanation behind this phenomenon was discovered.

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Anthocyanins would be present in an object that appears red

This is the term that is used to refer to the natural or the synthetic, substance that is known to give color to other materials or surfaces.

They are very useful in art as well as in cosmetics to create specific colors and effects.

Dyes, liquids and pastes are known to contain pigments in them. They are derived from plants or from animals of mineral sources

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Answer:

Many digital consumer products in everyday life such as mobile phones / smartphones, digital cameras, televisions, washing machines, refrigerators and LED bulbs also use semiconductors.

(B) The mechanical energy of the system consisting of the block does not change

(D) The mechanical energy of the system consisting of the block, spring and Earth increases by ¹/₂kx².

option B and D are the correct answers.

The law of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.

Based on the law of conservation of energy, the total mechanical energy of a system is always conserved.

Mathematically, the formula for conservation of mechanical energy is given as;

M.A = K.E + P.E

where;

When the block is placed at the given position, its mechanical energy does not change because the change in the kinetic energy of the block is equal to the change in potential energy of the block.

However, by compressing the spring, the block acquires stored elastic potential energy, this increases the total mechanical energy of the block and the entire system.

Mathematically, the formula for the stored elastic potential energy of the spring is given as;

U = ¹/₂kx²

where;

Thus, we can conclude the total mechanical energy of the system consisting of the block, spring and Earth increases by the stored elastic potential energy of the spring.

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Answer:

I=102=5A. I=2040=0.5A

Explanation:

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Answer:

The speed of the chair just before impact is 22.54 m/s

Explanation:

From the question,

The chair was initially at rest, that is, the initial velocity of the chair is 0 m/s.

Since the chair was thrown from a balcony, the chair will fall freely due to gravity.

To determine the speed of the chair just before impact, we will determine the final velocity of the chair.

From one of the equations of linear motion for objects falling freely due to gravity,

v = u + gt

Where v is the final velocity

u is the initial velocity

g is the acceleration due to gravity (Take g = 9.8 m/s²)

and t is time

From the question,

u = 0 m/s

t = 2.3 secs

Then, v = u + gt becomes

v = 0 + (9.8)(2.3)

v = 9.8 × 2.3

v = 22.54 m/s

Hence, the speed of the chair just before impact is 22.54 m/s.

Answer:

the answer is b. because liquid always bubble when boiling

The total time the bullet is in contact with the board is 8 x 10^-5 seconds

V1 = 400ms − the initial velocity of the bullet;

V2 = 300 ms− final velocity of the bullet;

d = 10cm = 0.1m − thickness of the board;

a − acceleration inside the board.

t − total time that the bullet is in contact with the board

To find the total time that the bullet is in contact with the board we can use formula :

t =  V1 -V2 / a

where a has been found to be 1.25 x 10^6 m/s²

Substituting the values, we have that total time that the bullet is in contact with the board = 8 x 10^-5 seconds

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Answer:

What she can do to collect the data is;

B. Gather a few oranges and see how many seeds are in each

Explanation:

The quantity Katie wants to find out is the number of seeds contained in each orange

Therefore, the required population = The number of seeds in a given orange

The method of estimation of the number of seeds per orange is sampling method, whereby the number of seeds in each of the orange in the sample is used to as an hypothesis as to the number of seeds expected in each orange of the entire population.

Therefore, in order to collect the data, she can gather a few oranges and see how many seeds are in each.