if you throw a football straight up with a velocity of 20m/s, what is its velocity when you catch it ?

The maximum permissible diameter of the rod is approximately 0.208 inches. The minimum permissible length of the rod is approximately 8333.33 inches.

To determine the maximum permissible diameter of the rod, we can use the formula for shear strain:

Shear Strain = Angle of rotation / Length

Given that the allowable shear strain is 0.0006 rad and the length of the rod is 18.0 in., we can rearrange the formula to solve for the maximum permissible diameter:

Diameter = 2 * sqrt(Shear Strain * Length)

Plugging in the values:

Diameter = 2 * sqrt(0.0006 rad * 18.0 in.)

Diameter ≈ 2 * sqrt(0.0108 rad * in.)

Diameter ≈ 2 * 0.104 in.

Diameter ≈ 0.208 in.

Therefore, the maximum permissible diameter of the rod is approximately 0.208 inches.

To determine the minimum permissible length of the rod, we can rearrange the formula for shear strain:

Length = Angle of rotation / Shear Strain

Given that the diameter of the rod is 0.5 in. and the allowable shear strain is 0.0006 rad, we can calculate the minimum permissible length:

Length = (Angle of rotation * Diameter) / Shear Strain

Length = (3.0° * 0.5 in.) / 0.0006 rad

Length ≈ 5.0 in. / 0.0006 rad

Length ≈ 8333.33 in.

Therefore, the minimum permissible length of the rod is approximately 8333.33 inches.

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Answer:

you are going 1 mile per hour depending on how fast

Explanation:

When two rods made of substance x are rubbed with substance y, they become charged. This process is known as charging by rubbing or charging by friction. When one of the charged rods is free to move, it will be attracted to the other rod, and they will interact by exerting an electrostatic force on each other.

The interaction between the rods is due to the transfer of charged particles, or electrons, from one rod to the other during the rubbing process. As a result, one rod becomes positively charged while the other becomes negatively charged. Opposite charges attract, so the positively charged rod will be attracted to the negatively charged rod. This attraction is the electrostatic force between the two charged rods.

To summarize, when two rods made of substance x are rubbed with substance y and one of them is free to move, they will interact by attracting each other due to the electrostatic force between their opposite charges.

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The statement that correctly describes the movement of thermal energy according to the second law of thermodynamics is "The natural tendency of systems is for heat to flow from a cooler object to a warmer one."

This principle is known as the law of heat flow, which states that heat energy will spontaneously transfer from regions of higher temperature to regions of lower temperature.

This process continues until thermal equilibrium is reached, where the objects or systems involved have the same temperature. It is important to note that the second law of thermodynamics also encompasses the concept of entropy, which states that in an isolated system, entropy tends to increase over time, leading to a more disordered state.

However, the statement specifically focuses on the direction of heat flow based on temperature differences.

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Complete question :

Which statement correctly describes the movement of thermal energy according to the second law of thermodynamics?

-The natural tendency of systems is for heat to flow from a cooler object to a warmer one.

-The natural tendency of systems is to evenly distribute energy until the objects are the same temperature.

-The natural tendency of systems is for heat to flow continuously between objects of the same temperature.

Answer:

A fuse and circuit breaker both serve to protect an overloaded electrical circuit by interrupting the continuity, or the flow of electricity. ... Fuses tend to be quicker to interrupt the flow of power, but must be replaced after they melt, while circuit breakers can usually simply be reset.

Answer:

Wood is lighter than iron of the same volume because wood has a lower density. Density is a measure of mass per unit volume, and iron is denser than wood. Iron has tightly packed atoms with strong metallic bonds, while wood has a porous structure with empty spaces between its fibers and cells. These empty spaces in wood reduce its overall mass for a given volume, resulting in its lighter weight compared to iron.

Explanation:

appreciate you helping me, what shall one do if he thinks he has done a mistake and wants to reverse it? related to bul l yinging stuffs in school

5 × 60 = 300

Therefore, you could run 300 meters in 60 seconds.

Answer:

300 meters

Explanation:

5 x 60 = 300

Operators must have unobstructed access to a ladder for escape from a trench within a distance of 25 feet.
According to OSHA regulations, operators must have unobstructed access to a ladder for escape from a trench within 25 feet. So, the correct answer is c 25 feet.

According to OSHA Occupational Safety and Health Administration, employers must provide ladders, steps, ramps, or other safe means of egress for workers working in trench excavations 4 feet 1.22 meters or deeper1. The means of egress must be located so as not to require workers to travel more than 25 feet 7.62 meters laterally within the trench1. Therefore, the answer is c 25 feet. Operators must have unobstructed access to a ladder for escape from a trench within 25 feet. So, the correct answer is c 25 feet

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Answer:

a

Explanation:

because it's need someone moving it so it can move somewhere else

The expression for the volume charge density of an infinitely long insulating cylinder of radius r is given by:

ρ(r) = ρ₀ / (1 + (r/a)^2)^(3/2) * (1 – (r/b)^2)^(3/2)

where ρ₀, a, and b are positive constants, and r is the distance from the axis of the cylinder. This expression shows that the charge density decreases with increasing radius, as the denominator increases more quickly than the numerator.

Additionally, the constants ρ₀, a, and b all affect the rate at which the charge decreases with increasing radius. The larger the value of ρ₀, the more quickly the charge density decreases with increasing radius, so it is important to choose the correct values for these constants in order to accurately model the charge distribution.

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The flaw in the experiment on water recycling is that the student did not see water dripping off the glass plate as expected. To correct this flaw, the student should use a cold glass plate instead of a hot glass plate.

The correct option to the given question is option 4.

When the student holds the hot glass plate above the beaker, the water vapor in the atmosphere will come into contact with the cold surface of the plate and condense, forming water droplets. However, if the glass plate is already hot, it will not be able to cool down the water vapor quickly enough for condensation to occur.

By using a cold glass plate, the temperature difference between the plate and the water vapor will be greater, allowing for faster condensation. This will result in water droplets forming on the glass plate and dripping off, demonstrating the process of water recycling through the atmosphere.

Therefore, the correct method to correct the flaw in this experiment is to use a cold glass plate instead of a hot glass plate. This will enable the student to observe water droplets on the glass plate as expected.

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A 100 gram body with something like a 20 joule consumption does indeed have a momentum of 2 kg m/s.

Momentum is defined as "the motion of an object proportional to the combination of its dimensions and its momentum." Anything that has momentum has a precise mass and is moving in a particular direction. Almost all motion-based activities include momentum. It is a cornerstone of physics.

In real life, electricity is the amount or power that motion or a series of acts adds. Results occur when opportunities are created by motivation. Energy serves as the connecting factor between movements, acceleration, and a movement direction. Any difference in movement results in force.

M = 100 gm

= 0.1 kg

kinetic energy k = 20 J

momentum P = √2mk

P = √2 * 0.1 * 20

= 2 kg m/s

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Answer:

B) The Gulf Stream carries warm water along the east coast, causing average temperatures to be warmer than they would be without the current.

Explanation:

The east coast of the United States is affected mainly by the Gulf Stream current, which brings warm water from the tropics into higher latitudes. Because warmer water evaporates faster, putting more moisture into the air, the current serves to increase the humidity of the air along the coast.

Answer:

I think the answer is B fell free to correct me if im wrong.

Answer:

the following image will make you understand

Explanation:

Answer: False

Explanation:

D. the region is full of gases that become ionized after they are released from volcanoes on io. The reason for the intense radiation in the region that traces Io's orbit around Jupiter (the Io torus) is due to Io's gravity.

Lo's gravity causes it to interact strongly with Jupiter's powerful magnetic field, and as a result, the region becomes a trap for charged particles from the solar wind. These charged particles are accelerated to high energies and become trapped in the magnetic field around Io, creating intense radiation. In addition to Io's gravity, the strong interaction between Io, Europa, and Ganymede also plays a role in creating the intense radiation in the Io torus.

This interaction creates a resonance effect, where the three moons' gravitational fields work together to create a synchronized orbital motion, which intensifies the trapping of charged particles in the region. The combination of these factors creates a harsh radiation environment that would be extremely hazardous to any spacecraft or living organisms.

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Complete Question:

why is the radiation so intense in the region that traces io's orbit around Jupiter (the io torus)?

group of answer choices

A. an orbital resonance between io, Europa, and ganymede makes the radiation intense.

B. io's gravity allows this region to capture huge numbers of charged particles from the solar wind.

C. Jupiter's strong magnetic field makes the radiation intense everywhere, and the region around io is no different than any other region.

D. the region is full of gases that become ionized after they are released from volcanoes on io.

Explanation:Lightning can affect radio waves in a number of ways. First, lightning can cause static interference on radio frequencies. This is because the electrical discharge from lightning can create electromagnetic fields that can disrupt radio signals. Second, lightning can also cause physical damage to radio equipment.

Answer:

Explanation:

If angle of incidence and angle of refraction be i   and r respectively ,

sini / sinr = μ ( refractive index )

sin r = sin i / μ

If angle of incidence i be constant and medium becomes denser that means μ becomes higher in value , the value of sin r will be low ( because of increase in value of denominator )

As sin r decreases , r also decreases also.

Hence when medium becomes denser , angle of refraction becomes less .

Answer:

p=g×g×h

Explanation:

pressure of liquid = density of liquid ×gravity×depth of liquid

A 200 kg snowmobile having the same momentum will travel at 45 m/s.

Momentum of an object is the product of mass and speed of an object.

P = mv

where;

m₁v₁ = m₂v₂

v₂ = m₁v₁/m₂

v₂ = (300 x 30)/200

v₂ = 45 m/s

Thus, a 200 kg snowmobile having the same momentum will travel at 45 m/s.

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To determine the new retained earnings as of July 31, 20rd, we can use the given information:

Retained earnings, July 1, 20rd: $259,725

Increases: Net income (Part B) = $10,325

Decreases: Dividends (Part C) = $12,000

The calculation for new retained earnings, July 31, 20rd would be:

Retained earnings, July 31, 20rd = Retained earnings, July 1, 20rd + Increases - Decreases

Retained earnings, July 31, 20rd = $259,725 + $10,325 - $12,000

Retained earnings, July 31, 20rd = $258,050

Therefore, the new retained earnings as of July 31, 20rd is $258,050.

The statement of cash flows for July would be as follows:

Statement of Cash Flows for July

Cash flows from operating activities:

Cash inflows:

Cash from customers $68,000

Cash outflows:

Payments for rent $(5,600)

Payments for supplies $(62,600)

Payments to creditors $(12,800)

Payments for utilities $(4,750)

Net cash flows from operating activities $(17,750)

Cash flows from investing activities:

Cash outflows:

Purchase of land $(150,000)

Net cash flows from investing activities $(150,000)

Net increase (decrease) in cash $(179,750)

Plus: Cash balance, July 1, 20rd $294,000

Cash balance, July 31, 20rd $114,250

Please note that the information provided assumes a cut-off date of July 31, 20rd.

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Answer:

friction

air drag

every thing that opposes the motion affects kinetic energy

Explanation:

kinetic energy is a energy which is increase with increase in motion and potential energy is energy stored while the object is at rest

potential energy ∝ 1/(kinetic energy)

as kinetic energy increases potential energy decreases

13.The color with the longest wavelength is option A. Red.

14.The sky appears blue due to option D. Scattering of light.

Red light has a longer wavelength compared to yellow and blue light.The color that has the longest wavelength is red. The color of the sky appears blue due to scattering of light. The distance between one peak and the next in a series of waves, particularly electromagnetic waves traveling through space or along a wire is referred to as wavelength.

The wavelength of light, for example, determines its color. Red light has the longest wavelength, followed by orange, yellow, green, blue, and purple, with violet light having the shortest wavelength. When light is reflected off a surface or passes through a medium, it can be deflected in various directions, a phenomenon known as scattering of light.

The Earth's atmosphere scatters sunlight in all directions, but the shorter blue wavelengths are scattered more than the longer wavelengths. As a result, we perceive the sky as blue during the day.  The light becomes scattered when it interacts with particles in the atmosphere, causing the sky to appear blue during the day and red during sunset or sunrise. The scattering of light is the process that causes the sky to appear blue.

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The acceleration 'a' of the tank moving up the inclined plane is 1.238 m/s².

To determine the acceleration 'a' of the tank, we need to consider the given values of x and y and apply the principles of rigid body motion.

By using trigonometry, we can calculate the components of acceleration along the x and y directions.

The acceleration along the y direction is due to the gravitational force acting vertically downwards, which can be calculated as g = 9.8 m/s².

Using the given angle of the inclined plane (30∘), we can find the acceleration along the x direction. By combining the x and y components of acceleration, we can determine the total acceleration 'a' of the tank.

In the context of rigid body motion on an inclined plane, determining the acceleration requires considering the forces acting on the object and applying Newton's second law.

By breaking down the motion into components along the x and y directions, we can analyze the effects of gravity and the inclination of the plane.

The trigonometric relationships between these components enable us to calculate the acceleration 'a' of the tank.

Understanding the principles of rigid body motion and utilizing trigonometry are essential for solving such problems.

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Answer: 7.51

Explanation: Acellus

The charges on each plate are acquired is 4.403×10⁻¹⁹ C if the two plates are separated by 2.42×10⁻⁵ m with an area of 8.22×10⁻⁴ m².

It is defined as the energy required in moving the unit's positive charge from one point to another. It is obtained from the ratio of the charge and distance. The unit of electric potential is Volt(V)

The electric potential between the parallel plates is obtained from the product of the Electric field and the distance of separation between the plates.

From the given,

Area of the plates, A = 8.22×10⁻⁴ m²

Distance of separation (d) = 2.42×10⁻⁵m

Voltage (V) = 25 V

Charge on the plates (Q) =?

The electric potential V = E/d, where E is the electric field and the unit of an electric field is N/C. d is the distance of separation of the plates. The electric field is the ratio of charge and area.

Electric field E = Q/ (A×ε), where A is the area of the parallel plates, and Q is the charge in the conductor. ε is permittivity in free space and is equal to 8.845×10⁻¹²C²/N.m².

The electric potential V = E/d

V = (Q/ (A×ε)) / d

  = Q / (A ×ε× d)

Q =  V×A×ε× d

   = 25×8.22×10⁻⁴×2.42×10⁻⁵×8.845×10⁻¹²

   = 4,403 × 10⁻²¹

   = 4.4 ×10⁻¹⁹C

The charge accumulated on the plates is 4.4 ×10⁻¹⁹C.

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Answer:

A crystal or crystalline solid is a solid material whose constituents are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions

Explanation:

your welcome

The ratio of the rocket's initial mass to final mass is 1.595

Usng the rocket formula, for change in speed

Δv = v㏑(Mi/Mf) where

Given that a rocket's orbital maneuver requires a speed increase of 1.05 × 10³ m/s. If its engine has an exhaust speed of 2.25 × 10³ m/s,

So,

Making (Mi/Mf) subject of the formula, we have

(Mi/Mf) = exp(Δv/v)

So, substituting these into the equation for the rocket speed, we have

(Mi/Mf) = exp(Δv/v)

(Mi/Mf) = exp(1.05 × 10³ m/s/2.25 × 10³ m/s)

(Mi/Mf) = exp(0.467)

(Mi/Mf) = 1.595

So, the ratio of the rocket's initial mass to final mass is 1.595

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To determine which time difference would give a false start of less than 0.2 seconds, we need to understand the context of the situation.

In sports such as track and field, false starts refer to when athletes begin before the starting signal is given. To prevent unfair advantages, there are rules and regulations in place to penalize athletes for false starts.

The allowable reaction time or false start limit varies depending on the specific sport and event. In many cases, the false start limit is set to 0.1 seconds or 100 milliseconds. However, for this explanation, let's assume a false start limit of 0.2 seconds.

If the time difference between the starting signal and the athlete's reaction is less than 0.2 seconds, it would be considered a false start and result in a penalty. Therefore, any time difference that is less than 0.2 seconds would result in a false start.

So, in this case, a time difference of less than 0.2 seconds is the answer.

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Explanation:

A micrometer is a measuring device or an instrument which is used to measure very minute measurements very accurately and precisely. It is mathematical tool used to provide accurate measurement for any mechanical components.

Now, if the micrometer that I have found is badly bent, it would provide faulty or wrong measurements both in terms of  precision and accuracy when compared to a high quality meter stick.

The final intensity of unpolarized light after passing through three polarizing filters is 12.5% of the original intensity.

This can be calculated using Malus' law, which states that the intensity of polarized light passing through a polarizing filter is proportional to the square of the cosine of the angle between the polarization axes of the filter and the incident light.

Therefore, the final intensity is 1/8 or 12.5% of the original intensity.

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