An arrow is shot straight up in the air at an initial speed of 46.0 m/s. After how much time is the arrow heading downward at a speed of 7.00 m/s? $

Answer:

Sound

Explanation:

A sound wave is a pressure wave; regions of high pressure (compressions) and low pressure (rarefactions) are established as the result of the vibrations of the sound source.  

Hi there!

1.

The period of a pendulum can be calculated using the following equation:
\(\large\boxed{T = 2\pi \sqrt{\frac{L}{g}}}\)

T = period (s)

L = length of string (m)
g = acceleration due to gravity (m/s²)

Plug in the values:

\(T = 2\pi \sqrt{\frac{4}{9.8}} = \boxed{4.014 s}\)

2.

Calculate the period:

\(T = \frac{\text{Time}}{\# of oscillations} = \frac{5}{20} = \boxed{0.4 s }\)

Frequency is the reciprocal of the period, so:

\(f = \frac{1}{T} = \frac{1}{0.4} = \boxed{2.5 Hz}\)

CR​ < CY​ < CB​

The factors which affect the critical angle are

(a) The colour (or wavelength) of light

(b) The temperature

(i) Effect of colour of light: The critical angle for a pair of media is less for the violet light and more for the red light. Thus the critical angle increases with the increase in wavelength of light.

(ii) Effect of temperature: The critical angle increases with increase in temperature because on increasing temperature of medium, its refractive index decreases.

According to the question,

μ 1​ sinCR​ =1

μ 2​ sinCY =1

μ 3​ sinCB​ =1

μ 1​ > μ 2​  and μ 2​ > μ 3

⟹μ 1​ > μ 2​ > μ 3

CR​ < CY​ < CB​

Thus,

The critical angle increases with the increase in wavelength of light.

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The time required to cover the Moon to a depth of 1.20 meters with micrometeorites.

To find out how long it would take to cover the Moon to a depth of 1.20 meters with micrometeorites, we can calculate the volume of the Moon and then divide it by the volume of one micrometeorite. Let's break down the calculation step by step:

Calculate the volume of the Moon:

The average radius of the Moon is approximately 1.737 ×10⁶ meters. Using the formula for the volume of a sphere, V = (4÷3)πr³, we can calculate the volume of the Moon.

\(V_{moon}\) = (4÷3)π(1.737 × 10⁶)³

Calculate the volume of one micrometeorite:

The diameter of the micrometeorite is given as 1.30 ×10⁽⁻⁶⁾ meters, which means the radius is half of that.

\(r_{meteorite}\) = (1.30 × 10⁽⁻⁶⁾)÷2

Using the formula for the volume of a sphere, V = (4÷3)πr₃, we can calculate the volume of one micrometeorite.

\(V_{meteorite}\) = (4÷3)π((1.30 × 10⁽⁻⁶⁾)÷2)³

Calculate the number of micrometeorites needed to fill the Moon:

To find the number of micrometeorites required to fill the Moon, we divide the volume of the Moon by the volume of one micrometeorite.

\(N_{meteorites}\) = \(V_{moon}\) ÷ \(V_{meteorite}\)

Calculate the time to fill the Moon:

Since one micrometeorite strikes each square meter of the Moon each second, we can equate the number of micrometeorites needed to fill the Moon to the number of seconds it would take.

Time = \(N_{meteorites}\) ÷ (1 m²/s)

Convert seconds to years:

Finally, we convert the time in seconds to years by dividing by the number of seconds in a year (assuming 365.25 days in a year and 24 hours in a day).

\(Time_{years}\) = Time ÷ (365.25 days/year × 24 hours/day × 3600 seconds/hour)

Performing these calculations will give us the time required to cover the Moon to a depth of 1.20 meters with micrometeorites.

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Answer:

CENTER OF GRAVITY is the point in the object around which its weight is evenly distributed.

Explanation:

An object's center of gravity (CG) is the equilibrium point where its constituent parts are uniformly distributed. In this situation, the object may behave as though its entire weight were concentrated at the center of gravity (CG).

Applications include the concept that a weighted object always rotates freely about its center of mass and that a weighted object will fall over if its center of gravity is beyond its base of support. Additionally, the center of gravity is where the most force is applied.

The point in the object around which its weight is evenly distributed is known as the center of gravity.

It is also referred to as the center of mass. The center of gravity is the point around which the mass of an object is evenly distributed in all directions. There are different ways to find the center of gravity of an object. However, one common method involves suspending the object from different points and then marking the vertical line. The intersection of these lines is the center of gravity. The center of gravity has applications in physics and engineering. For instance, in the design and construction of buildings, it is essential to determine the center of gravity to ensure the stability and safety of the structure. In summary, the center of gravity is an important concept in physics and engineering that helps in understanding the distribution of weight and stability of objects.

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Answer:

I think your answer might be letter C

Explanation:

If it is wrong I am so sorry forgive me if it is wrong let me know please ok.

The velocity after 2 seconds is 26 m/s. It takes 11.50 seconds to reach a velocity of 40m/s.

Given the equation s(t) = 6t + 5t²

Let's find the velocity after 2 seconds.

(a) Velocity = (ds)/(dt)

Differentiating s(t) with respect to t, we get; ds(t) / dt = 6 + 10t

At t = 2,ds(t) / dt = 6 + 10t = 6 + 10(2) = 26m/s

Therefore, the velocity after 2 seconds is 26 m/s.

(b) We are to find how long it takes for the velocity to reach 40m/s. We know that the initial velocity of the ball, u = 6m/s. Acceleration = gsinθ = 9.81 x sin (angle of inclination) = 9.81 x 0.3 = 2.943 m/s²From the first equation of motion, v = u + at

We know v = 40m/s, u = 6m/s, a = 2.943m/s² and t is what we are to find, hence the equation becomes;40 = 6 + 2.943(t)t = (40 - 6) / 2.943t = 11.50s

Therefore, it takes 11.50 seconds to reach a velocity of 40m/s.

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Answer:

a) Fnet = 176.78N

b) Enet = 88.39 × 10⁵N/C

Explanation:

Answer:

They examine theories in a systematic manner.

Explanation:

Answer:

Experiments have shown that a magnetic Just sitting next to a wire produced no current flow through that wire. However, If the magnet is brought close to the coil of wire or a relative motion is established between the magnet and the wire then a current is induced in the wire. The closer the magnet moves, the more the Induced current.

Explanation:

A magnet sitting next to a wire would not induce a current in the wire because the magnetic lines of force of the magnet are not in relative motion to the wire.

If you move a magnet close to a  wire, the electrons will move thus generating current.  

Answer:

32 m/s

Explanation:

Answer:

b. between 2 s and 4 s

Explanation:

2-4 was both 3m/s

Answer:

2 s

Explanation:

Since the car is accelerating from a stop, it has an initial velocity of 0 m/s. The acceleration of the car is 43 m/s².

We want to find the time it takes for the car to have a final velocity of 86 m/s.

We can relate all four of these variables (initial velocity, final velocity, acceleration, time) in this kinematic equation:

Substitute the known variables into the equation.

It will take the car 2 seconds to reach 86 m/s.

Answer: 2 seconds

Explanation: In physics (m/s^2) meters per second squared or meters per second per second, literally means by how many meters per second the velocity changes every second. In this case it is 43. The car moves 43 meters a second per every second. That means that the car would move 86 meters in 2 seconds, 129 in 3 seconds, and so on.

(+) In cases like this, the fastest way to find the answer is to do simple division.

86/43 = 2

(Example) Look at it this way, the car is going 45 miles per hour. How long will it take to reach 90 miles? If the car goes 45 miles per hour, that means in 2 hours it will reach 90 miles.

90/45 = 2

Simple division.

Your very welcome, let me know if you have any questions. :-)

-szimbitskyy

Rarefraction  is decrease of substance density .

1) Rarefraction is a space in a longitudinal wave  where particles are furthest apart and Compression is a place in a longitudinal waves and particles are in close vicinity.

2)The region where the substance in compressed is called Compression and the region where Medium spread out is Rarefraction . They are antagonist to each other.  

*All sounds are longitudinal waves and they also include compression and Rarefraction.

*Compression is decrease of Volume by applying stress on that substance.

* The force attraction between the Molecules of solid is more as compare to liquid and air . So ,that is steel has more sound as Compare to air ,it 17times faster than Air .

*Frequency is also known pitch in sound.

*If the frequency will be above than 20khz , it can lead to deafness or can make you uncomfortable for hearing.

*The loundness of any sound is a part of Amplitude .

*The loundness is measured in decibel.The normal person can hear only 50Decibels.

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Answer:

No,unless the force is balanced and the object doesn't move .

Answer:

A

Explanation:

THE LIGHT SLOWS DOWN

When light from the Sun passes through any type of matter the light slows down.

The behavior of light from the Sun as it interacts with any matter depends on the matter and its properties.

Since it comes through a vacuum and enters our atmosphere which is a denser medium and has a definite refractive index, the light slows down.

This also happens when light falls on material such as glass, water, and other transparent and translucent media. When it emerges out of such medium to a rarer medium like air, it speeds up to its initial speed.

A portion of the sunlight is absorbed by almost all the matter present on earth that's why something heats up when exposed to sunlight. While a considerable portion of the sunlight is reflected by the matter.

But the question says what happens when it passes through any matter. The answer is:

It slows down while passing through the matter since any matter is optically denser than the vacuum.

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Answer:

1.125x10^-10 electrons

Explanation:

Pls see attached file

Answer:

y = 3.26 [m]

Explanation:

In order to solve this problem, we must use the following equation of kinematics.

\(v_{f}^{2}= v_{o}^{2}-2*g*y\)

where:

Vf = final velocity = 0

Vo = initial velocity = 8 [m/s]

g = gravity acceleration = 9.81 [m/s²]

y = elevation [m]

Note: The negative sign in the equation above represents that the movement is againts the direction of the gravity acceleration.

Now replacing:

\(0=8^{2} -2*9.81*y\\19.62*y=64\\y=3.26 [m]\)

Answer:

a moderate base

Explanation:

Milk of magnesia is popularly known as magnesium hydroxide. Magnesium hydroxide Mg(OH)₂ is used as an anti-acid in toothpaste and medically as a mild laxative.

Its pH values range between 10- 11 on the pH scale.

A solution with pH value of 7 is neutral(i.e. neither acidic nor basic.

A pH value which is less than 7 is acidic while a pH value greater than 7 is basic.

For a pH value between 12 -14 on the pH scale is said to be a strong base.

Since Milk of magnesia Mg(OH)₂ pH values ranges between 10- 11 on the pH scale, it is known to be moderately basic.

Answer:

Rocks and pebbles that hit Earth's atmosphere and burn up are ______. ... an object in motion stays in motion unless acted upon by another force ... Kepler's Laws of Motion explain why ______. ... planets closer to the sun travel faster in their orbits than planets that are far away ... comets have long tails ... objects can move.

Explanation:

Kepler's Laws of Motion  explain why planets closer to the sun travel faster in their orbits than planets that are far away from the sun.

According to Kepler's first law the sun is at one of the foci of the planets' elliptical orbits around the sun, . Perihelion, the name for the point at which a planet is closest to the sun, and aphelion, the name for the point at which a planet is farthest from the sun.

According to Kepler's third law, the squares of the revolutionary periods  of the planets is directly proportional to the cubes of their mean distances from the sun.  

Therefore, planets closer to the sun travel faster in their orbits than planets that are far away from the sun. Thus, option A is correct.

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When baker adds an egg yolk of having density 1027kg/m³ to the water of having density 997 kg/m³, it will go down on the surface of the bowl inside the water.

Density is the ratio of mass to volume. it tells how much mass a body is having for its unit volume. for example egg yolk has 1027kg/m³ of density, means if we collect numbers of egg yolk and keep it in a container having volume 1 m³ then total amount of mass it is having will be 1027kg.

Density is a scalar quantity.

when we add egg yolk into the water, egg yolk has greater density than water( 997 kg/m³), because of higher density of egg yolk it contains higher mass in same volume as water. hence due to higher mass higher gravitational force is acting on the egg yolk therefore it goes down on the inside the water. water will float upon the egg yolk.

same situation we have seen when we spread oil in the water. ( in that case water has higher density than oil. thats why oil floats on the water)

Hence egg yolk goes down inside the water when we add it inside the water.

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In a refracting telescope, the distance between the objective and eyepiece lenses satisfies a certain relationship that ensures the image produced by the objective is at infinity and is used as the object for the eyepiece.

A refracting telescope consists of two lenses: the objective lens and the eyepiece lens. The objective lens produces an image of a distant object at its focal point, which is located at a distance f1 from the lens. This image is real and inverted, but it is also very small.

The eyepiece lens is placed in front of this image and produces a magnified virtual image that can be viewed by the observer. The distance between the eyepiece lens and the objective lens is called the tube length.

For the telescope to work properly, the distance between the lenses must satisfy the relationship f2 = f1/ (M-1), where f2 is the focal length of the eyepiece lens, f1 is the focal length of the objective lens, and M is the magnification of the telescope.

This relationship ensures that the image produced by the objective lens is at infinity and is used as the object for the eyepiece. It also ensures that the magnification of the telescope is equal to the ratio of the focal lengths of the two lenses.

In conclusion, the distance between the objective and eyepiece lenses in a refracting telescope satisfies a specific relationship that ensures the image produced by the objective is at infinity and is used as the object for the eyepiece.

This relationship is f2 = f1/(M-1), where f1 and f2 are the focal lengths of the objective and eyepiece lenses, respectively, and M is the magnification of the telescope. This relationship is essential for the proper functioning of the telescope and for producing a magnified, clear image of distant objects.

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Kilo- means 1,000 and a kilometer is 1,000 meters is a unit of measurement equal to one thousand meters.

The kilometer, or kilometer in American English, is a unit of measurement in the length in the International System of Units (SI) that is equal to 1,000 meters (SI symbol: km; /klmitr/ or /klmtr/) (kilo- being the SI prefix for 1000). With noteworthy exceptions in the United States and the United Kingdom, where the statute mile is the primary unit employed, it is now the measuring unit used for describing distances between geographical places on land in the majority of the world. The French National Constituent Assembly authorized the French Academy of Sciences to create a new measurement system by edict dated May 8, 1790.

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Answer:

Because the disturbances are in opposite directions for this superposition, the resulting amplitude is zero for pure destructive interference

Explanation:

Explanation: Research highlights the individuals with ASDS are nutritionally vulnerable because they exhibit a selective or pick eating pattern and sensory sensitivity that predisposes them to restricted intakes.

I hope this helps!

Given :

Potential ,

\(P=644 \times 10^6\ V\\ \\P=6.44\times 10^8\ V\)

Uniform magnetic field , B = 0.02 T .

Mass of proton , \(M_p=1.67\times 10^{-27}\ kg\) .

Charge on proton , \(e=1.6\times 10^{-19}\ C\) .

Also , velocity of proton is perpendicular to magnetic field .

To Find :

The radius of the proton's resulting orbit .

Solution :

Now , when velocity is perpendicular to magnetic field radius of orbit is given by :

\(r=\sqrt{\dfrac{2VM_p}{eB^2}}\)

Putting all given values above :

\(r=\sqrt{\dfrac{2\times 6.44\times 10^8\times 1.67\times 10^{-27}}{1.6\times 10^{-19}\times 0.02^2}}\\\\r=183.33 \ m\)

Therefore , radius of orbit is 183.33 m .

Hence , this is the required solution .

Answer:

answer is 7!!!!

Explanation:

Answer:

Explanation:

20890

A single layer of sedimentary rock is known as a bed or stratum (plural: strata). Each bed contains rock of a single composition and texture and can clearly be distinguished from the beds or strata above and below. This layering of strata is unique to sedimentary rocks and occurs because of the way that sediments are deposited.

when force stays the same and the mass increases, the ACCELERATION DECREASES.