Is this right? Please help me

The athlete who jumps a vertical distance of 0.8 m has a initial speed of: 3.959 m/s and his total time in the air is: 0.8078 s

The formulas for the vertical launch upward and the procedures we will use are:

Where:

Information about the problem:

Applying the maximum height formula and clearing the initial velocity we get:

y max = v₀²/(2*g)

v₀ = √(y max * (2*g))

v₀ = √( 0.8 m * (2 * 9.8 m/s²))

v₀ = √( 0.8 m * 19.6 m/s²)

v₀ = √15.68 m²/s²

v₀ = 3.959 m/s

Applying  the maximum time formula we get::

t max = v₀ / g

t max =(3.959 m/s)/(9.8 m/s²)

t max = 0.4039 s

Applying  the time of flight formula we get::

t(of) =2 * t max

t(of) =2 * 0.4039 s

t(of) = 0.8078 s

In physics vertical launch upwards is the motion described by an object that has been launched vertically upwards in which the height and the effect of the earth's gravitational force on the launched object are taken into account.

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A large stony/icy object would likely cause more damage if it struck near an urban area than a small metallic one.

This is because the kinetic energy of an object is proportional to its mass and velocity squared, so a larger object will have more kinetic energy than a smaller one, all else being equal. Additionally, stony/icy objects tend to be denser than metallic objects, meaning they have more mass per unit volume, which also contributes to their higher kinetic energy.

When a large object such as a stony or icy meteoroid strikes the Earth, it can generate a powerful shockwave that can cause widespread damage to surrounding areas. The shockwave can lead to ground shaking, structural damage, and even cause fires due to the high heat generated upon impact.

In contrast, a small metallic object would have less mass and therefore less kinetic energy, and may not generate enough force to cause significant damage. However, it is important to note that the specific size and composition of the object, as well as the location and angle of impact, will all play a role in determining the amount of damage caused.

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The capacitors are connected, each capacitor has a charge of Qdc=6C. The capacitors' capacitances are C1=1.0F and C2=2.0F, and the source's emf is equal to 10V. The potential difference between A and B is 5.0V.

You add each of the capacitances using the method below to determine the total can be of the a number more capacitors joined in this way: CTotal Equals C1 Plus C2 + C3, etc. Example: to determine the combined capacitance of these three parallel capacitors.

C1 and C2 serve as coupling capacitors primarily, letting AC signals travel while block DC at the inputs and outputs in order to prevent voltages from earlier or later circuits from upsetting the biased condition for the this amplifier.

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Answer:

Finna take your points

Explanation:

The other answer got maxed out ฅ^•ﻌ•^ฅ

Answer:

Niháo wúji si fiueng^^

Explanation:

I just introduced myself in Mandarin^^

A hiker walks 4.5 km at an angle of 45 degree north of west, then the hikers walks 4.5 km south, 3.45 km is the magnitude of the hikers total displacement.

The hiker's total displacement can be found by combining the two displacement vectors. The first displacement vector has a magnitude of 4.5 km and is directed at an angle of 45 degrees north of west. This can be resolved into its horizontal and vertical components as follows:
Horizontal component = 4.5 km x cos(45°) = 3.18 km west
Vertical component = 4.5 km x sin(45°) = 3.18 km north
The second displacement vector has a magnitude of 4.5 km and is directed due south. This can be represented by a single vertical component of -4.5 km.
To find the total displacement, we simply add the horizontal and vertical components of both vectors:
Horizontal displacement = 3.18 km (west) + 0 km (east) = 3.18 km (west)
Vertical displacement = 3.18 km (north) - 4.5 km (south) = -1.32 km (south)
The magnitude of the total displacement can be found using the Pythagorean theorem:
Magnitude = sqrt((3.18 km)^2 + (-1.32 km)^2) = 3.45 km
Therefore, the magnitude of the hiker's total displacement is 3.45 km.

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The effective resistance of the Parallel circuit is 3 ohms.

option B.

In a parallel circuit, the sum of the currents through each path is equal to the total current that flows from the source.

The total resistance or effective resistance in a Parallel circuit with the following formula:

1/Rt = 1/R1 + 1/R2

where;

1/Rt = 1/4 + 1/12

1/Rt = (3 + 1 ) / 12

Rt = ( 12 ) / ( 4 )

Rt = 3 ohms

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The main difference between Kinetic energy and Potential energy is that kinetic energy refers to movement while potential energy refers to storage.

Kinetic energy is a type of energy in motion or energy in movement such as a turbine (mechanical energy), while Potential energy refers to the energy that is stored to be used when required (e.g. chemical bonds of foods).

Therefore, with this data, we can see that  Kinetic energy is used as movement, while Potential energy is stored to be used in the future.

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Answer:

9N

Explanation:

net force = right force - left force

net force = 22 - 13=9N

a tractor-trailer vehicle combination with double 45 ft. trailers is most likely to roll over compared to other configurations.

1) Length and weight: Double 45 ft. trailers are longer and heavier than other configurations, which increases the risk of instability and loss of control.

The longer and heavier the trailers, the more difficult it is to maneuver them, especially when turning or traveling at high speeds. This makes them more susceptible to rollover accidents.

2) Center of gravity: The center of gravity of a tractor-trailer combination is an important factor in determining its stability.

When two 45 ft. trailers are connected, the center of gravity is higher than in other configurations, which makes the vehicle more top-heavy and less stable. This increases the likelihood of rollover accidents.

3) Weight distribution: The weight distribution between the two trailers also plays a significant role in the likelihood of rollover accidents.

When the weight is not evenly distributed between the two trailers, the lighter trailer may lift off the ground, which can cause the entire combination to become unstable and rollover.

Double 45 ft. trailers have a larger weight capacity, which makes it easier to overload one trailer and create an uneven weight distribution.

4) Road conditions: Road conditions such as wind, rain, ice, and snow can also increase the risk of rollover accidents.

Double 45 ft. trailers are more susceptible to these conditions because they have a larger surface area and are more difficult to maneuver. When traveling in adverse weather conditions, the risk of a rollover accident is higher.

In summary, a tractor-trailer vehicle combination with double 45 ft. trailers is most likely to roll over because they are longer and heavier than other configurations, have a higher center of gravity, can be loaded unevenly, and are more susceptible to adverse weather conditions.

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Answer: This is what I found hope it helps

Explanation:

Answer:

ur awnser is d

Explanation:

!(*´∇`)ﾉ

Answer:

Colour of any object is by the colour of light it reflects i.e if white light is incident on the object,it will reflect blue color.so it will appear blue.But if red light is incident on it,it will not reflect that and absorb it.so as it will not reflect any light it will appear black.

Explanation:

Answer:The events listed that could cause supply to change are:

A producer goes out of business.

A natural disaster causes production to drop.  

A resource needed to produce more of the good has became scarce.

If a producer goes out of business, supply will decrease because one of the people that were supplying the market with goods and services will no longer be doing so.

When there is a natural disaster, this can also reduce supply as it can damage production facilities as well as limit access to the resources needed for production.

If the resource that is needed in production becomes scarce, supply will drop because there would be reduced production of goods and services.

The events that could cause the change in supply shown on this graph will be A producer going out of business. and a natural disaster causes production to drop.

The quantity of a certain product or service that suppliers are prepared to offer to consumers at a given price level at a given time is referred to as supply.

When a producer goes out of business, supply decreases because one of the persons who was supplying the market with goods and services no longer does so.

Natural disasters can also affect supply because they can damage industrial infrastructure and limit access to the resources needed for production.

Hence the events that could cause the change in supply shown on this graph will be A producer going out of business. and a natural disaster causes production to drop.

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Answer:

Both apply to a certain region.

Explanation:

Answer:

both apply to a certain region.

Explanation:

climate refers to the overall average weather year-round in that location. weather however refers to the current weather in that location.

hope this helps ;)

A football workout involves two linemen who are pushing on the coach and the sled. The sled and the coach's combined mass is 300 kg, while the coefficient of friction between the sled and the grass is .800. The sled accelerates at a rate of .580 m/s/s. We need to determine the force applied to the sled by the linemen.

The total force acting on the sled is:Force = Mass × AccelerationF = 300 kg × .580 m/s/s = 174 NSince the sled and the grass's coefficient of friction are known, we can determine the force applied to the sled by the linemen using the following equation:

Frictional Force = Coefficient of Friction × Normal Force

The normal force is equal to the weight of the sled and the coach. Thus,Normal Force = Mass × GravityN = 300 kg × 9.81 m/s/s = 2943 NFrictional Force = .800 × 2943 N = 2354.4 NThe force applied to the sled by the linemen is the difference between the total force acting on the sled and the frictional force.

Force Applied by Linemen = Total Force − Frictional ForceF = 174 N − 2354.4 N = −2180.4 NThe linemen are exerting a force of −2180.4 N on the sled in the opposite direction to the sled's movement. This is because the frictional force is greater than the total force acting on the sled.

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The amount of helium atoms lined up side to side that  would span the diameter of a human hair is: 1.5625*10^6  atoms

To solve this problem the we have to do the conversion of units with the given information.

Information about the problem:

By converting the units of the helium atom's diameter from nm to mm, we have:

d(helium atom)= 0.064 nm * 1 m/1*10^6 mm

d(helium atom)=  6.4*10^-8 mm

To know how many helium atoms lined up side to side would span the diameter of a human hair, we have to do a division as a following:

amount of helium atoms lined up side to side= d(human hair)/d(helium atom)

amount of helium atoms lined up side to side= 0.1 mm/6.4*10^-8 mm

amount of helium atoms lined up side to side= 0.1 mm/6.4*10^-8 mm

amount of helium atoms lined up side to side= 1.5625*10^6

It is the transformation of a value expressed in one unit of measurement into an equivalent value expressed in another unit of measurement of the same nature.

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Answer: The speed limit is 15 mph when you come within 100 feet of a railroad crossing and you cannot see the tracks for 400 feet in both directions. You may go faster than 15 mph if the crossing is controlled by gates, a warning signal, or a flagman.

Explanation: hope this helps

Answer:69

Explanatioits funnyn:

Coulomb's law may be used to determine the value of 1/(40)(q1q2)/|r|2, where q1 and q2 are the charges on the spheres, and |r| is the distance between them.

In this case, the vector difference between the spheres' locations may be used to calculate the distance between them: r = r2 - r1 = -70e-2, 40e-2, 0>m. The value of this vector's magnitude, |r|, is 81.24e-2 m. The Coulomb's law equation is solved as follows: 1/(40)(q1q2)/|r|2 = 1/(4(8.854e-12 N-1 C2 m-2)) (-5e-9 C)(-5e-9 C)/(81.24e-2 m) (81.24e-2 m)² = 1.01 N. As a result, the value of 1/(40)(q1q2)/|r|2 is around 1.01 N.For q1=-5e-9 C, q2=-5e-9 C, m1=m2=2e-3 kg, r=-70e-2, 40e-2, 0>m, and 0 is the electric constant, the value is roughly 1.01 N.

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Explanation:

Energy is always involved in changes of state. Matter either loses or absorbs energy when it changes from one state to another. For example, when matter changes from a liquid to a solid, it loses energy. The opposite happens when matter changes from a solid to a liquid.

The angular velocity of the wind turbine blades is approximately 2.30 rad/s, and the kinetic energy of the blades is dependent on the given values and needs to be calculated using the formulas provided.

To calculate the angular velocity of the wind turbine blades, we can convert the given rotation speed of 22 rpm to radians per second.

The formula to convert rpm to radians per second is:

ω = (2π * rpm) / 60

Let's calculate the angular velocity:

ω = (2π * 22) / 60

Next, we can use the moment of inertia formula for rotating objects to find the moment of inertia of the blades:

I = \((1/3) * m * r^2\)

Where:

I is the moment of inertia,

m is the mass of the blades, and

r is the length of the blades.

Let's calculate the moment of inertia:

I = \((1/3) * 12000 kg * (41 m)^2\)

Now, we can calculate the kinetic energy of the rotating blades using the formula:

KE = \((1/2) * I * ω^2\)

Let's substitute the values and calculate the kinetic energy:

KE = \((1/2) * [(1/3) * 12000 kg * (41 m)^2] * [(2π * 22) / 60]^2\)

Finally, we can determine the kinetic energy of the wind turbine blades.

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The repeated flying into the air and landing on the same spot reinforces to the woodcock that this is the center of its territory.

The phrase "Woodcock sky dances" refers to the woodcock's breeding routine. It is a migratory bird that mates in the United States' Eastern and Central regions. Woodcock "sky dances" or courtship flights, which are a part of its breeding ritual, are familiar to ornithologists and bird lovers.The male woodcock prepares for the display by choosing a place and then creating a tiny opening in the trees or shrubs. It flies into the air at sunset or sunrise, calling out with a distinctive chirping sound. It then lands on the same spot, with each flight being more extensive than the last. The woodcock does this repeatedly, with each flight reaching a greater height than the previous one.

The woodcock's territory is at the center of its sky dancing. The repeated flying into the air and landing on the same spot reinforces to the woodcock that this is the center of its territory. During the breeding season, the woodcock's sky dancing activity is essential. It shows off the male's strength and agility to female woodcocks, which aids in their selection of mates.The woodcock's behavior is a result of natural selection. Through sky dancing, the woodcock's species has developed its breeding ritual over thousands of years. The ability to perform sky dances is an evolutionary benefit to the woodcock, as it aids in species reproduction and survival. Therefore, repeatedly flying into the air and landing on the same spot reinforces to the woodcock that this is the center of its territory.

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The true statements are:Jupiter's Great Red Spot is in the southern hemisphere.The fastest wind speed recorded in our solar system is on Neptune.

Among the given statements, only two are true. Jupiter's Great Red Spot, a massive storm, is indeed located in the southern hemisphere of the planet. The Great Red Spot is a prominent feature on Jupiter, visible as a giant swirling storm system. On the other hand, the fastest wind speed recorded in our solar system, reaching speeds of up to 2,100 kilometers per hour (1,300 miles per hour), is found on Neptune.

The strong winds on Neptune contribute to its dynamic atmosphere and the formation of features like the Great Dark Spot. The remaining statements about Pluto, Saturn's moon Enceladus, and Uranus are not true according to our current understanding.

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Electrostatic precipitators use electrical charges to attract and trap pollutants, such as dust particles, sulfur dioxide, and smoke particles.

This technology works by using high voltage to ionize the pollutant particles, which changes their electrical charge and results in an attractive electrical force that is directed to metal plates or tubes, known as collectors.

Once the particles reach the collector, they build up and can be removed from the air. This technology is usually used to control emissions of particles that are too small to be blocked by traditional mechanical filters, such as those found in large power plants and fossil fuel facilities.

Because electrostatic precipitators are so efficient and powerful, they are now frequently used in many industries where air pollution control is needed. With proper maintenance and upkeep, this technology can be very effective in reducing air pollution, and keeping the surrounding air clean.

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The frequency of the flashes is 12,500 Hz. The number of times a flashing light blinks in a minute is known as the number of flashes per minute, or FPM.

The frequency of the flashes can be calculated using the formula:

f = 1/T

where f is the frequency and T is the period of the flashes.

In this case, the period is given as 8.00×10^-5 s. So we can substitute this value into the formula:

f = 1 / (8.00×10^-5 s)

f = 12,500 Hz

Therefore, the frequency of the flashes is 12,500 Hz.

Flickering light is produced by lamps using alternating current (AC) electric systems at a frequency of 120 Hertz (Hz, cycles per second), which is double the frequency of a power line at 60 Hz (50 Hz in many countries outside North America).

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The final temperature of the seawater-deck system is 990°C.

The increment in temperature adds up the thermal energy into the object. This energy is Heat energy.

The deck of a small ship reaches a temperature Ti= 48.17°C seawater on the deck to cool it down. During the cooling, heat Q =3,710,000 J are transferred to the seawater from the deck. Specific heat of seawater= 3,930 J/kg°C.

Suppose for 1 kg of sea water, the heat transferred from the system is given by

3,710,000 = 1 x 3,930 x (T - 48.17)

T = 990°C  to the nearest tenth.

The final temperature of the seawater-deck system is 990°C.

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The energy of the absorbed photon was approximately 12.094 electron volts (eV).

When a photon is absorbed by a hydrogen atom in the ground state, the electron is excited to a higher energy level. In this case, the electron is boosted to the n=6 energy level. To calculate the energy of the absorbed photon, we can use the Rydberg formula:

ΔE = -R_H ×(1/n_f² - 1/n_i²)

Where ΔE is the change in energy, R_H is the Rydberg constant for hydrogen (approximately 13.6 eV), n_f is the final energy level (n=6), and n_i is the initial energy level (n=1, ground state).

ΔE = -13.6 × (1/6² - 1/1²)
ΔE ≈ 12.094 eV

So, the energy of the absorbed photon was approximately 12.094 electron volts (eV).

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The acceleration of the box is 6 m/s²; option A.

The acceleration of the box is determined as follows:

Frictional force = 660 * 0.15 = 99 N

Net force = 500 - 99 = 401 N

Mass of the box = 660/9.8 = 67.3 kg

Acceleration = net force/mass

Acceleration = 401/67.3

Acceleration = 6 m/s²

In conclusion, the acceleration of the box is determined from the net force and the mass of the box.

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If the lead can be extracted with 92.5 efficiency, the mass of ore is required to make a lead sphere with a 7.00 cm radius is 17.707 kg.

To find the mass of ore, the given values are,

The radius of the lead sphere is r = 7.0 cm,

The lead can be extracted with, η = 92.5% = 0.925 efficiency.

Density is the substance's mass per unit of volume.

We know the density of lead as,

⇒ p = 11.4 g/cm³ .

The volume of the lead sphere is,

V = 4/3πr³

   = 4/3π(7)³

V = 1436.7 cm³.

Mass of the lead present in the lead sphere is,

m = p . V

    = 11.4  × 1436.7

    = 16379 g

m = 16.379 kg

From the expression of efficiency, we calculate the mass of the ore,

η = Mass of lead obtained / Mass of the ore to be taken

0.925 = 16.379 kg / Mass of the ore to be taken

Mass of the ore to be taken = 17.707 kg

If the lead can be extracted with 92.5 efficiency, the mass of ore is required to make a lead sphere with a 7.00 cm radius is 17.707 kg.

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The correct statement is the insoluble sugar collected on the sprinkles and made them turn white.

So, option A is correct.

Sugar is described as the generic name for sweet-tasting, soluble carbohydrates, many of which are used in food. Simple sugars, also called monosaccharides, include glucose, fructose, and galactose.

If Kira is making an extra special hot chocolate by adding sugar, cocoa powder, and colored sprinkles to hot water. Then if after drinking all of the liquid, she sees a clump of white sprinkles on the bottom of the cup. It goes to tell us that the insoluble sugar collected on the sprinkles and made them turn white.

In chemistry, sugar is known as sucrose which is a molecule composed of 12 atoms of carbon, 22 atoms of hydrogen, and 11 atoms of oxygen  with a chemical formula of (C12H22O11). Like all compounds made from these three elements, sugar is a carbohydrate.

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