A small object begins a free-fall from a height of 21.0 m. After 1.10 s, a second small object is launched vertically upward from the ground with an initial velocity of 34.0 m/s. At what height h above the ground will the two objects first meet?

Space debris was formed by the collision of objects after the planets formed. The answer is A. The answer is A. The answer is C. The answer is B.  The answer is D.

The answer is B. Space debris was formed by the collision of objects after the planets formed. Models of the solar system account for the presence of space debris because space debris is made up of small rocks and other objects that are in orbit around the sun.

Some of this debris comes from asteroids and comets that are left over from the formation of the solar system, but most of it is thought to have been created when larger objects collided with one another. The answer is A.

Chemical composition is the most important physical property in determining the extent of a planet's evolution.

The answer is A. Earthquakes are among the effects of plate tectonics on Earth. Other effects include volcanic activity, the formation of mountain ranges, and the creation of new crust at the mid-ocean ridges.

The answer is C.

The Moon has almost no atmosphere compared with the Earth, which is why it is much colder. The atmosphere helps to trap heat near the surface of the Earth, while the Moon has no such mechanism.

The answer is B. The major constituents of the Earth's atmosphere are nitrogen (78%), oxygen (21%), and argon (1%).33. The answer is C. Transverse and compressional waves are transmitted by a liquid.34.

The answer is C. Continental drift is thought to be caused by circulation currents in the deep interior of the Earth, which cause slabs of the Earth's crust to move slowly.

The answer is D. We know that the Earth has differentiated because its crust density is lower than the mean density, and because of the presence of a magnetic field.

These observations suggest that the Earth has a metallic core that is responsible for the magnetic field, and that the core is more dense than the mantle and crust.

In conclusion Space debris was formed by the collision of objects after the planets formed, to 29 A. Chemical composition is the most important physical property in determining the extent of a planet's evolution, to 30 A. Earthquakes are among the effects of plate tectonics on Earth, to 31 C. The Moon has almost no atmosphere compared with the Earth, to 32 B. The major constituents of the Earth's atmosphere are nitrogen (78%), oxygen (21%), and argon (1%), to 33 C.

Transverse and compressional waves are transmitted by a liquid, to 34 C. Continental drift is thought to be caused by circulation currents in the deep interior of the Earth, and to 35 D.

We know that the Earth has differentiated because its crust density is lower than the mean density, and because of the presence of a magnetic field.

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The launch angle of the projectile is approximately 30.96 degrees. To determine the launch angle of the projectile, we can use the relationship between the maximum height and horizontal range.

The maximum height is related to the horizontal range through trigonometric functions. By solving the equation for the given ratio of maximum height to horizontal range, we can find the launch angle. In this case, the launch angle of the projectile is approximately 30.96 degrees.

Let's assume the launch angle of the projectile is θ. We know that the maximum height (H) is related to the horizontal range (R) by the equation H = (2/5)R.

The maximum height can be calculated using the equation H = (v² * sin²θ) / (2g), where v is the initial velocity of the projectile and g is the acceleration due to gravity.

The horizontal range can be calculated using the equation R = (v² * sin2θ) / g.

By substituting these equations into the given ratio (H = (2/5)R), we have:

(v² * sin²θ) / (2g) = (2/5) * (v² * sin2θ) / g.

Simplifying the equation, we get sin²θ = (4/5) * sin2θ.

Using the double-angle identity for sine, sin2θ = 2sinθcosθ, we can rewrite the equation as sin²θ = (4/5) * 2sinθcosθ.

Further simplifying, we have sin²θ = (8/5)sinθcosθ.

Dividing both sides by sinθ, we get sinθ = 8/5cosθ.

Now, we can use the trigonometric identity sin²θ + cos²θ = 1 to solve for cosθ: cosθ = √(1 - sin²θ).

Substituting sinθ = 8/5cosθ into the equation, we have cosθ = √(1 - (8/5cosθ)²).

Squaring both sides of the equation, we get cos²θ = 1 - (64/25)cos²θ.

Rearranging the equation, we have (25/25)cos²θ + (64/25)cos²θ = 1.

Simplifying, we find (89/25)cos²θ = 1.

Dividing both sides by (89/25), we have cos²θ = 25/89.

Taking the square root of both sides, we get cosθ = √(25/89).

Finally, we can find the launch angle θ by taking the inverse cosine \((cos^(-1))\) of √(25/89).

Evaluating the expression, we find θ ≈ 30.96 degrees.

Therefore, the launch angle of the projectile is approximately 30.96 degrees.

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Answer:

yes

Explanation:

there are other quantities that are dimensionless, but have a unit.

For example, radian is the unit for an angle. But it is dimensionless because it is defined to be the ratio of two lengths.,

a dimensionless quantity will always be independent of the base units — meter, second, kilograms, kelvin, candela, moles, ampere.

Other examples:

1. Mass fraction

2.Mole fraction

both have unit (kg/kg)

Answer:

A quantity that has dimensions must have units. Yes a quantity have units but still be dimensionless for example,unit of angle is radian ,but it is a dimensionless quantity. A dimensionless quantity may have unit. ... A unitless quantity never has a non-zero dimension.

I hope it's helpful!

Answer:

D.  A record of all the physical activity you complete in one week.

Explanation:

A "Fitness Log" allows you to keep track of your workout or exercise. Therefore, it is a record of the different workout you've managed to complete within a time frame. It gives you several information such as the type of workout you've completed, its duration and the time of the day it was performed. This makes a person motivated to exercise because he can see his progress. He may also include his mood before and after workout in order to become more mindful in exercising and many other things.

Answer:

the answer is D  i just got the answer right

Explanation:

Answer:

This plasma mostly consists of electrons

Answer: static

Explanation:

Answer:

A: 2.8 * 10^(-14) J

Explanation:

Formula to find the energy is;

E = hc/λ

Where;

E is energy of a photon (E)

λ is wavelength of the light

c is speed of light

Thus;

E = (1.99 *10^(-25))/(7 * 10^(-12))

E = 2.8 * 10^(-14) J

Answer:

Here's a list of a few reasons behind cracked or chipped walls:

Moisture-laden walls

Weather conditions

Incompatibility with the surface

Inferior-quality paints

Let’s discuss each of them one by one.

Explanation:

Lots of moisture

In a house, bathroom and kitchen are the two places where there is a lot of moisture and dampness. Therefore, you will see that these places are the first to report the problem of flaky paint. When moisture is absorbed, it passes through various coats of paint, removing the adhesive that sticks the paint to the wall. Therefore, you can spot paint coming off in the form of flakes or like a banana peel. This shows the extra moisture in the walls need to be addressed immediately.

Too much sunlight

Paint often chips off walls due to high temperatures. If direct sunlight hits the walls all day, it can cause the paint to dry out faster. The oil paints start to crack, while latex paints lose their quality to stick to the walls.

Incompatible paints

When painting, it is extremely important to use the same kind of paint on the surface that’s being coated. For instance, if it is latex paint, it isn’t compatible with oil-based paints and shouldn’t be painted on top of each other. If you are planning to use the leftover oil-paint as a second coat over the base coat of latex paint, then be prepared to see the paint coming off sooner than expected.

Also, make sure the surface on which you are about to paint is compatible with the paint you are using. For instance, smooth surfaces require a certain kind of paint and layering that keeps the coating intact. For uneven surfaces, it’s better to go for textured paint. It is important to prime and prep the surface first before applying a coat of paint to make sure the paint doesn’t come off easily.

Low-quality paints

Some paints seem good, especially to your wallet, but once you use them, you will face bad consequences. Inferior-quality paints do not adhere to the walls properly and also do not give a nice finish once the paint job is done. To avoid cracks in the walls, do not use low-quality or expired paints.

Answer:

98.

Explanation:

divide

The change in the kinetic energy of the cart is equal to 34875 J.

The energy which is possessed by a moving body because of its motion is known as kinetic energy. Work should be done in order to bring the change in the kinetic energy of a moving object.

The kinetic energy of a moving object can be determined from the formula mentioned below:

K.E. = ½mv²     where ‘m’ and 'v' is the mass and velocity of the object.

Given, the mass of the carriage, m = 450 Kg

The speed of the carriage, u = 18 m/s

The initial kinetic energy of the cart = (1/2) × 450 × (18)²

(K.E.)₁ = 72900 J

The final speed of the cart, v = 13 m/s

The final kinetic energy of of the cart = (1/2) × 450 × (13)²

(K.E.)₂ = 38025 J

The change in the kinetic energy of the cart = (K.E.)₂ - (K.E.)₁

Change in the kinetic energy = 72900 - 38025 = 34875 J

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Answer:

A hypothesis is a possible explanation for a set of observations or an answer to a scientific question. A hypothesis must be testable and measurable.

Explanation:

Answer:

hypothesis is likely tobe the answer, im indian

To find the probability of each defect, we divide the frequency of each defect by the total frequency of all defects.

The probability of each defect is found by dividing the frequency of that particular defect by the total frequency of all defects. The total frequency of all defects is calculated by summing up the frequencies of all the defects. Then, the frequency of each defect is divided by the total frequency to obtain the probability.

For example, to find the probability of Excess adhesive, we divide its frequency (190) by the total frequency of all defects (822). Similarly, we calculate the probability for each defect by dividing its frequency by the total frequency.

These probabilities represent the relative likelihood of each defect occurring out of the total defects observed on the printed circuit board.

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Answer:

D

Explanation:

1st law of thermodynamics states that energy can neither be created nor be destroyed but can be converted from one form to another.

D) In In a small/insulated chamber, a piece of wood burns burns; however, the total energy within the system is unchanged.

The  1st law of Thermodynamics states that the  energy can neither be created nor be destroyed , the energy of the universe remain the same . Though it can be exchanged between the system and the surrounding.

Hence , correct answer

D) is) In a small/insulated chamber, a piece of wood burns burns; however, the total energy within the system is unchanged.

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Answer:

hertz

Explanation: play piano

Answer:

5 KG of ice would have the lowest thermal energy

Answer:

its A; 5 kg of ice

Explanation:

yurrrr

The fugitive will catch up to the empty box car in approximately 4.9 seconds, and he will have traveled a distance of about 14 meters to reach the box car.

To solve this problem, we can first determine the time it takes for the fugitive to reach his maximum speed of 6.0 m/s using the formula v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time. Rearranging the formula, we have t = (v - u) / a.

Substituting the given values, we get t = (6.0 m/s - 0) / 1.5 m/s² = 4.0 seconds. This is the time it takes for the fugitive to reach his maximum speed.

Now, let's calculate the distance traveled during this time. We can use the equation s = ut + (1/2)at², where s is the distance, u is the initial velocity, t is the time, and a is the acceleration. Since the fugitive starts from rest (u = 0), the equation simplifies to s = (1/2)at².

Substituting the values, we get s = (1/2)(1.5 m/s²)(4.0 s)² = 12 meters. Therefore, the distance traveled by the fugitive to reach his maximum speed is 12 meters.

Now, the fugitive is traveling at a constant speed of 6.0 m/s and trying to catch up to the empty box car, which is moving at a constant speed of 5.4 m/s. The relative velocity between them is 6.0 m/s - 5.4 m/s = 0.6 m/s.

To calculate the time it takes for the fugitive to catch up to the box car, we divide the distance traveled by the relative velocity: t = 12 meters / 0.6 m/s = 20 seconds.

Therefore, the fugitive will catch up to the empty box car in approximately 20 seconds. However, since the fugitive has already traveled for 4 seconds (the time to reach his maximum speed), we subtract that from the total time: 20 s - 4 s = 16 seconds.

Finally, to calculate the distance traveled by the fugitive to reach the box car, we multiply the time by the constant speed: s = 16 seconds * 6.0 m/s = 96 meters.

Therefore, it takes the fugitive approximately 16 seconds to catch up to the empty box car, and he travels a distance of about 96 meters to reach it.

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Answer:

low melting point

Ionic compounds have high melting and boiling points. This is because a considerable amount of energy is required to break the strong inter-ionic attraction

Explanation:

It takes approximately 0.00 seconds for a crest of this wave to travel the length of the wire.

The speed of a wave on a string can be determined by the equation:

\(v = √(T/μ)\)

Where v is the speed of the wave, T is the tension in the string, and \(μ\)is the linear mass density of the string.

To find the time it takes for a crest of the wave to travel the length of the wire, we need to calculate the speed of the wave and divide it by the wavelength of the wave.

First, let's convert the wavelength to meters: 2 m = 2000 mm.

Next, let's find the speed of the wave using the formula:

v = \(fλ\)

Where v is the speed of the wave, f is the frequency, and λ is the wavelength.

v = (863 Hz) * (2000 mm) = 1,726,000 mm/s

Now, let's convert the mass of the wire to kilograms: 32 g = 0.032 kg.

To find the tension in the wire, we can use the equation:

T = \(μg\)

Where T is the tension, \(μ\)is the linear mass density, and g is the acceleration due to gravity.

Let's find μ using the formula:

\(μ\)= m/L

Where \(μ\)is the linear mass density, m is the mass of the wire, and L is the length of the wire.

\(μ\)= (0.032 kg) / (5 m) = 0.0064 kg/m

Now, let's find the tension in the wire:

T = (0.0064 kg/m) * (9.8 m/s^2) = 0.06272 N

Finally, we can find the time it takes for a crest of the wave to travel the length of the wire:

time = length / speed

time = 5 m / (1,726,000 mm/s / 1000 mm/m) = 0.002898 s

Therefore, it takes approximately 0.00 seconds for a crest of this wave to travel the length of the wire.

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A star's path through your sky depends on your latitude and the star's position in relation to Earth's celestial sphere. Latitude plays a significant role in determining which stars and constellations are visible at different times of the year. At higher latitudes, you will see a smaller portion of the sky, while at lower latitudes, you can observe more stars and constellations.

The star's position is determined by two coordinates: right ascension and declination. Right ascension measures the star's eastward distance from the vernal equinox along the celestial equator, while declination measures the star's north or south position relative to the celestial equator. These coordinates help determine the path a star takes across the sky.
As Earth rotates on its axis, stars appear to move in circular paths around the celestial poles. Stars closer to the poles will have smaller circular paths and may never set, becoming circumpolar stars. Stars closer to the celestial equator have larger paths and may rise and set, following a more diagonal path across the sky.

In summary, a star's path through your sky depends on your latitude and the star's position in the celestial sphere, determined by its right ascension and declination. These factors affect the visibility and motion of stars as they appear to travel across the night sky.

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The reason that most seti programs choose to listen at microwave radio frequencies is that They have an ability of transmitting along a vast range of frequencies without any overlap .

Microwaves are the most energy efficient way to send information In electromagnetic spectrum, microwaves comes  between radio waves and infrared waves. They are high frequency waves and their wavelengths are short . Due to which they are used in radio and television broadcasting too . They have an ability of transmitting along a vast range of frequencies without any overlap . Hence , most seti programs choose to listen at microwave radio frequencies .

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Answer:

2

Explanation:

The distance covered by the friend is 50.28 m.

The speed of the friend is twice mine.

The distance around a circle is known as the circumference of a circle.

To calculate the circumference of a circle, the formula below is used:

circumference = 2 * π * r

where;

r is the radius of the circle

π is a constant = 22/7

The circumference of the two circles will be

Circle 1; r = 4 m

Circumference = 2 * 22/7 * 4 m

Circumference = 25.14 m

Circle 2; r = 8 m

Circumference = 2 * 22/7 * 8 m

Circumference = 50.28 m

If the same time is taken to complete both distances, it means that the second horse is moving twice as fast as the first.

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Answer:

Wavelength of light in  diamond λ2 = 179.75 nm (Approx.)

Explanation:

Given:

Blue light of wavelength λ1 = 435 nm

n2 in diamond = 2.42

Find:

Wavelength of light in  diamond λ2

Computation:

Since the wavelength is smaller, the frequency stays constant. The frequency of vibrations does not shift when they pass from one source to the next.

So,

n1λ1 = n2λ2

(1)(435) = (2.42)λ2

Wavelength of light in  diamond λ2 = 179.75 nm (Approx.)

Answer:

180

Explanation:

got it right on acellus

Because copper is the second-best electrical conductor, it's cheaper and more plentiful than silver, and it's relatively easy to get it out of the ground, refine it, and form it into wires.

(If the electrical wiring in your house was all silver wire, I guess nothing would ever work, because people would keep stealing your wiring.)

The mechanism that is responsible for the formation of snowflakes is the nucleation of ice crystals.

This is defined as a piece of snow which falls from the sky as a result of an extremely cold climate condition and is common in the arctic regions of the world.

Snow flakes are formed when ice crystals stick together to form the flakes which usually has a dust or pollen being formed around the area being talked about.

This is also regarded as a type of precipitation such as rain etc and is therefore the most appropriate choice.

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B) angular velocity. When the speed of the satellite follows a circular path around a planet, its velocity remains constant but its direction changes constantly. This means that the satellite has a non-zero angular velocity, which is the rate at which the satellite rotates around the planet.

The linear velocity, or the speed of the satellite, is also constant but its direction changes constantly as well. The centripetal acceleration is the force that keeps the satellite moving in a circular path, and it is directed towards the center of the circle. This acceleration changes the direction of the satellite's velocity but not its speed. The angular acceleration is the rate at which the angular velocity of the satellite changes, and it is zero in this case because the satellite has a constant angular velocity. The total acceleration of the satellite is the vector sum of its centripetal acceleration and any other forces acting on it, but it is not constant and may change in magnitude and direction over time. Therefore, the only quantity that is constant and non-zero for a satellite following a circular path around a planet is its angular velocity.

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Answer:

2 and 0.6 ohms = 1.8A

4ohms = 1.08A

6 ohms = 0.72 ohms

Explanation:

With the help of the given diagram calculate the current through each resistor.​

According to ohms law

E = IRt

E is the electromotive force = 9V

I is the total current in the circuit

Rt is the total equivalent resistance

Get Rt

1/R = (1/4+1/6)  (parallel resistors)

1/R = 3+2/12

1/R = 5/12

R = 12/5

R = 2.4 ohms

Rt = 2 + 0.6 + 2.4

Rt = 5 ohms

Get the total current

I = E/Rt

I = 9/5

I = 1.8A

Since same current flows in a series connected resistors

Current in the 2 and 0.6 ohms resistors will be 1.8A

For the 4 and 6 ohms resistor:

Voltage across them is expressed as:

V = IR

V = 1.8(2.4)

V = 4.32Volts

The current in 4 ohms resistor

I = 4.32/4

I = 1.08A

The current in 6 ohms resistor

I = 4.32/6

I = 0.72A

Answer:

The answer is four hundred twenty six or 426

Answer:

426

Explanation:

As the velocity of a stream carrying a mixture of particles decreases, the heaviest particles will most likely be deposited first. This phenomenon is known as sedimentation.

The process of sedimentation separates particles of different sizes and densities from a mixture by allowing them to settle at different rates due to gravity. The heavier particles settle faster than lighter ones. Therefore, they are the first to be deposited.Sedimentation can occur naturally or artificially. For example, in a river, sedimentation can occur naturally due to changes in water flow and velocity. Artificial sedimentation can be used in water treatment plants to remove impurities from water

The heaviest particles will most likely be deposited first as the velocity of a stream carrying a mixture of particles decreases.Explanation: This is due to the process of sedimentation, which separates particles of different sizes and densities from a mixture by allowing them to settle at different rates due to gravity. The heavier particles settle faster than lighter ones, and hence they are the first to be deposited.

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F = (0.20 kg) x (5.0 \(m/s^{2}\)) = 1.0 N, which is the same as the applied unbalanced force.

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.

The given situation describes an object with a mass of 0.20 kg experiencing an acceleration of 5.0 \(m/s^{2}\) when an unbalanced force of 1.0 N is applied to it.

The net force acting on the object can be calculated using the equation F = ma, where F is the net force, m is the mass, and a is the acceleration.

Therefore, F = (0.20 kg) x (5.0 \(m/s^{2}\)) = 1.0 N, which is the same as the applied unbalanced force.

This illustrates that the acceleration of the object is directly proportional to the force applied to it, in accordance with Newton's second law of motion.

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