A football was kicked so that it traveled 65 yards in 3.0 total seconds. What was the speed
and angle above horizontal that the ball was kicked?

Answer:

Initial y-component of speed

Vy = 28 * sin 30 = 14 m/sec vertically

1/2 m Vy^2 = 2 m g h    conservation of energy of y-component

h = Vy^2 / (2 * g) = 14^2 / (2 * 9.8) = 10 m

Answer:

Explanation:

The charge of - 5C will be spread  on the outer surface of the shell . The presence of - 8C charge at the Centre will create + 8C charge on the inner surface and - 8C charge on the outer surface . The result is that the total charge on the outer surface of the shell will be - 5C + - 8C = - 13C and the inner surface will have charge of + 8C . + 8C charge will be locked to centrally situated - 8C charge and will not be neutralized by negative charge of outer surface .

Answer:

Outer core?

Explanation:

The energy is being transferred out of the field.

Because to Jupiter's greater mass, the satellite in its orbit will feel a stronger attractive force. This is due to the fact that the gravitational force is inversely proportional to the mass of the item producing it.

The satellite will move tangentially in the original orbit with its instantaneous velocity absent a centripetal force before the force of gravity is cancelled out. As a result, the spacecraft will veer off course and escape its orbit.

More separation distance will result in lower gravitational forces since gravitational force is inversely proportional to the square of the distance between the two interacting objects. So, when objects move apart, their gravitational pull becomes less powerful.

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Answer:

Explanation:

Add pqq to both sides

3t = pqq + 2 pn                       Pull out p as a common factor.

3t = p(qq + 2n)                       Divide by qq + 2n

3t/(qq + 2n)

Answer:

15.27822581

Explanation:

The player has committed a goaltending or basket interference violation when touching the ball or any part of the basket while the ball is on or within either basket.

Goaltending and basket interference are basketball violations that involve a player touching the ball or any part of the basket while the ball is on or within either basket. Goaltending occurs when a defensive player touches a shot that is on a downward trajectory towards the basket or has already hit the backboard.

Basket interference happens when a player, either offensive or defensive, touches the ball when it is on the rim or within the cylinder extending from the rim. Both goaltending and basket interference result in the offending team being penalized, with the opposing team being awarded the points that would have been scored if the violation had not occurred.

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a. The speed of the object after traveling 48.3 m is approximately 20.7 m/s [E]. b. If the initial and final speeds are the same as before, the object will travel approximately 46.5 m.

a. To calculate the speed of the object after traveling a certain distance, we need to consider the work done by friction and the change in kinetic energy.

The work done by friction is given by:

Work = force of friction * distance.

The force of friction can be calculated using the formula:

Force of friction = coefficient of kinetic friction * normal force.

The normal force is the force exerted by the surface perpendicular to the object's motion. On a horizontal surface, the normal force is equal to the object's weight, which can be calculated as:

Weight = mass * gravity.

In this case, the mass of the object is 0.252 kg, and the acceleration due to gravity is approximately 9.8 m/s^2.

Normal force = 0.252 kg * 9.8 m/s^2.

Next, we can calculate the work done by friction:

Work = (coefficient of kinetic friction) * (normal force) * distance.

The change in kinetic energy is equal to the work done by friction:

Change in kinetic energy = Work.

Finally, we can calculate the final speed using the equation:

Final speed^2 = Initial speed^2 + (2 * change in kinetic energy / mass).

Initial speed = 23.4 m/s [E].

Distance = 48.3 m.

Coefficient of kinetic friction = 0.500.

Mass = 0.252 kg.

b. If the initial and final speeds are the same as before, it means the change in kinetic energy is zero. We can use the same formula as in part a to calculate the distance traveled, but this time the change in kinetic energy is set to zero.

Initial speed = 23.4 m/s [E].

Final speed = 20.7 m/s [E].

Coefficient of kinetic friction = 0.475.

Mass = 0.252 kg.

a. The speed of the object after traveling 48.3 m is approximately 20.7 m/s [E].

b. If the initial and final speeds are the same as before, the object will travel approximately 46.5 m. These calculations are based on considering the work done by friction, the change in kinetic energy, and using relevant formulas related to kinetic friction and motion.

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The magnitude of the magnetic field 0.01 m from the same wire is 0.2 T.

Given to us:

Magnetic field, \(B_1 = 0.1\ T\)

Radius of wire, \(R_1 = 0.02\ m\)

To find out the magnitude of the magnetic field 0. 01 m from the same wire, we need to find out current first. we will use the formula,

\(B = \dfrac{\mu_oI }{2\pi R},\\\rn\\where,\\B= magnetic\ field\\\mu_o = 4\pi\times 10^{-7} m\cdot kg\cdot s^{-2} A^{-2}\ is\ the\ magnetic\ constant\\I= current\\R= radius\ of\ the\ wire\)

Putting the values,

\(B_1 = \dfrac{\mu_oI }{2\pi R_1},\\\rn\\\\0.1= \dfrac{4\times \pi \times 10^{-7}\times I}{2\times \pi\times0.02}\\\\I=10,000\ A\)

Now, for \(B_2\)

\(B_2 = \dfrac{\mu_oI }{2\pi R_2},\\\rn\\\\B_2= \dfrac{4\times \pi \times 10^{-7}\times 10,000}{2\times \pi\times0.01}\\\\B_2= 0.2\ T\)

Hence, the magnitude of the magnetic field 0. 01 m from the same wire is 0.2 T.

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An alternative way to explain Hubble's Law without relying on the standard Big Bang idea of a universe with no center and no edge is through the concept of a "tired light" hypothesis.

According to this hypothesis, the redshift observed in distant galaxies is not due to their motion away from us in an expanding universe, but rather the result of photons gradually losing energy as they travel through space.

In the tired light scenario, the wavelength of light is thought to stretch over time due to interactions with matter or other unknown processes. As a result, the light from distant galaxies appears redshifted, mimicking the effect of cosmic expansion. This explanation implies that the universe may have a finite size and a center, challenging the notion of an infinite and uniformly expanding universe.

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The pressure drop over a certain length of horizontal pipe is assumed to be a function of the velocity is true because of the relationship between fluid flow and pressure, which is described by the Bernoulli's principle.

The pressure drop over a certain length of horizontal pipe is typically related to the flow rate through the pipe, which is in turn related to the velocity of the fluid. This relationship is described by the Darcy-Weisbach equation,

ΔP = f (L/D) (ρV^2/2)

Where ΔP is the pressure drop, L is the length of the pipe, D is the diameter of the pipe, ρ is the density of the fluid, V is the average velocity of the fluid, and f is the friction factor, which depends on the roughness of the pipe surface and the Reynolds number of the flow.

This equation shows that the pressure drop is proportional to the square of the velocity of the fluid, which means that as the velocity increases, the pressure drop will also increase. Therefore, the pressure drop over a certain length of horizontal pipe can be related to the velocity of the fluid flowing through it.

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Answer:

To test a gas and determine its composition, you can use various analytical techniques and instruments depending on the specific gas and the level of detail required. Here are a few common methods:

1. Gas Chromatography (GC): Gas chromatography is a widely used technique for separating and analyzing gas mixtures. It involves injecting the gas sample into a chromatographic column, where different gas components separate based on their affinity for the column material and their interaction with the mobile phase. The separated components can then be identified and quantified using detectors such as thermal conductivity detectors or mass spectrometers.

2. Fourier Transform Infrared Spectroscopy (FTIR): FTIR spectroscopy is a technique that analyzes the absorption of infrared light by gas molecules. It can identify various gas components based on their characteristic absorption patterns in the infrared region. The gas sample is exposed to infrared radiation, and the resulting spectrum is compared to a spectral database to determine the gas composition.

3. Mass Spectrometry (MS): Mass spectrometry is a powerful technique for analyzing gas composition. It ionizes gas molecules and separates them based on their mass-to-charge ratio. The resulting mass spectrum provides information about the identity and relative abundance of different gas components. Mass spectrometry can be coupled with other techniques such as gas chromatography (GC-MS) for enhanced separation and identification capabilities.

4. Gas Sensors: Gas sensors are devices that can detect and measure the concentration of specific gases in the atmosphere. Different types of gas sensors are designed to detect specific gases or groups of gases. These sensors can be based on various principles, such as electrochemical, semiconductor, or optical techniques. Gas sensors are often used for on-site or real-time monitoring applications.

It's important to note that the choice of method depends on the specific requirements of the gas analysis, including the target gases, sensitivity, accuracy, and the available resources. In some cases, a combination of techniques may be used to obtain a comprehensive analysis of a gas sample.

Explanation:

It will take about 11.8 days for the water to boil.

The first step is to find the decay constant (λ) of the radium isotope using the half-life equation:

t1/2 = 0.693/λ

where t1/2 is the half-life.

So, rearranging the equation, we get:

λ = 0.693/t1/2

  = 0.693/11.43 days

  = 0.0605 day⁻¹

Next, we need to calculate the number of radium atoms in the 1.0 g cube using Avogadro's number and the molar mass of 223Ra:

Number of atoms \(= (1.0 g)/(223 g/mol) * (6.022 * 10^{23} atoms/mol)\)

                             = 2.7 x 10²⁰ atoms

Since each radium atom emits an alpha particle during decay, we can calculate the activity of the radium sample:

Activity = (2.7 x 10²⁰ atoms) x (1 decay/atom) x (1 alpha particle/decay)

             = 2.7 x 10²⁰ alpha particles per second

Now, we need to calculate the energy released per alpha particle. The energy (E) released per alpha particle can be calculated using the equation:

E = (Q/m) x Na

where

Q is the energy released per decay,

m is the mass of the radionuclide per decay, and

Na is Avogadro's number.

For 223Ra,

Q = 5.69 MeV,

m = 223/2 = 111.5 g/mol, and

Na = 6.022 x 10^23 atoms/mol.

Therefore,

E = (5.69 MeV/decay)/(111.5 g/mol) x (6.022 x 10²³ atoms/mol)

   = 3.84 x 10⁻¹³ J/alpha particle

Finally, we can calculate the rate of energy transfer to the water by multiplying the activity of the radium sample by the energy released per alpha particle:

Rate of energy transfer = (2.7 x 10²⁰ alpha particles/s) x (3.84 x 10⁻¹³ J/alpha particle)

                                      = 1.04 W

To boil the water, we need to transfer enough energy to raise its temperature from 16°C to 100°C and to vaporize it.

The specific heat capacity of water is 4.18 J/g°C, and the heat of vaporization of water is 40.7 kJ/mol, or 2257 J/g. The mass of the water is 460 g, so the total energy required is:

Energy required = (460 g) x (4.18 J/g°C) x (100°C - 16°C) + (460 g) x (2257 J/g)  

                            = 1.06 x 10⁶ J

Finally, we can calculate the time required to transfer this amount of energy to the water using the formula:

Energy transferred = Rate of energy transfer x time

Solving for time, we get:

time = Energy required/Rate of energy transfer

       = (1.06 x 10⁶ J)/(1.04 W)

       = 1.02 x 10⁶ s

       = 11.8 days

Therefore, it will take about 11.8 days for the water to boil.

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Answer:

See the answers below.

Explanation:

The magnitude can be easily found by means of the Pythagorean theorem.

\(C = \sqrt{(C_{x})^{2} +(C_{y})^{2}} \\C=\sqrt{(105)^{2} +(88.2)^{2} } \\C=\sqrt{18804.24}\\C = 137.13 [m]\)

We know that the coordinates in x and in y are negative, therefore the vector should be located in the fourth quadrant, see attached image.

And the angle with respect to the horizontal can be determined by means of the tangent of the angle.

\(tan(\alpha )=\frac{88.2}{105}\\tan(\alpha ) =0.84\\\alpha =tan^{-1} (0.84)\\\alpha =40\)

These are 40 degrees below the X-positive horizontal axis.

Answer:

137.13

Explanation:

I got it right on Acellus

Answer:

Explanation: Sorry sister

Answer:

yes it would u just wouldn't be able to hit him as hard as u would if u were using your dominate hand

Explanation:

No, electrolyte doesn't conduct electricity when it's solid because it hasn't evolved into ions or charged particles.

Electrolytes are substances that are capable of conducting electricity in both their molten and aqueous states while also undergoing chemical alterations. The electrolyte conducts the electricity due to a dissociation into positively charged particles and negatively charged particles.  Electrolytes are substances which conduct electricity in both molten state and aqueous solution but not in solid state. Ions cannot move freely in the solid state because they are fixed. In contrast, ions can freely move in molten form. The ions of salt in the solid state are bonded with strong inter-particle forces. Hence, they are not free to move in a solid state and cannot conduct electricity. But Salt water is the best conductor. This is because salt in an ionic compound and can easily move electrons between positive and negative ions.

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Answer:

b. has landforms made by flowing liquid water

- has many huge on its surface

- gets its red color from iron oxide present in soil and rocks on surface

- reflects light from sun

Explanation:

The correct answer is e. None of the above alternatives gives a true statement. None of the statements in options a, b, c, and d are true when it comes to a modulus M over a ring R having a finite basis.

When a modulus M can be formed entirely from a finite set of elements, the modulus M is said to be finitely generated. M's finite basis does not, however, automatically imply that M is finitely generated. A basis is a set of linearly independent elements, and it might not be enough to produce all of the components of the modulus.

According to the assertion in option b, M must include nonzero items of nonzero order if it has a finite basis. This is untrue, though. The smallest positive number k, such that the element raised to the power of k equals the identity element, is referred to as the order of an element.

According to option c, every non-null element in a modulus with a finite basis has a null. Nevertheless, this claim is likewise untrue. It is possible for a modulus with a finite basis to have non-null elements without a null element.

According to option d, a ring R is a body, or a field, and only then can a modulus have a finite basis. However, this assertion is also untrue. Even though the ring R is not a field, a modulus can nonetheless have a finite basis. None of the given alternatives provides a true statement about a modulus M over a ring R having a finite basis.

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The voice of women has been biologically proven to be shriller than men. A shrill voice is generally high-pitched.

Our throat contributes to the function of our speech and voice. The structure of the vocal cords leads to the change in voice.

The vocal cords of women are shorter. This leads to high-frequency in voice. This means that the higher the vibrations of the sound waves, the shriller the voice.

This difference in the voice of women to that of men is noticed properly after they hit puberty. The biological and hormonal changes in the body lead to the change in voice too.

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Answer:

Approximately \(5.56 \times 10^{-7}\; {\rm m}\) in this glass.

Explanation:

The frequency of a wave is the number of periods that this wave completes per unit time.

The speed of a wave is the distance that this wave travels in unit time.

Thus, dividing the speed \(v\) of the wave by the frequency \(f\) of this wave would give the distance that this wave covers in each period (cycle) of this wave. By definition, the distance that a wave covers in each period is precisely the wavelength of this wave. Therefore, an equation for the wavelength \(\lambda\) of a wave would be:

\(\begin{aligned}\text{wavelength} &= \frac{\text{speed}}{\text{frequency}}\end{aligned}\).

\(\begin{aligned}\lambda &= \frac{v}{f}\end{aligned}\).

Note that \(1\; {\rm Hz} = 1\; {\rm s^{-1}}\).

The wavelength of this light in this glass would be:

\(\begin{aligned}\lambda &= \frac{v}{f} \\ &= \frac{2.0 \times 10^{8}\; {\rm m\cdot s^{-1}}}{3.6 \times 10^{14}\; {\rm s^{-1}}} \\ &\approx 5.56 \times 10^{-7}\; {\rm m}\end{aligned}\).

Answer:

A simple machine having a velocity ratio of 3 simply means that the ratio of the distance moved by effort to the distance moved by load is equal to 3.

Explanation:

A simple machine can be defined as a type of machine with no moving parts but can be used to perform work.

Basically, a simple machine allows for the transformation of energy into work. The six simple machines are;

I. Inclined plane.

II. Screw.

III. Wheel and axle.

IV. Lever.

V. Wedge.

VI. Pulley.

Mathematically, the velocity ratio of a simple machine is given by the formula;

\( Velocity \; ratio = \frac {Distance \; moved \; by \; effort}{Distance \; moved \; by \; load} \)

Hence, a simple machine having a velocity ratio of 3 simply means that the ratio of the distance moved by effort to the distance moved by load is equal to 3.

Acceleration will increase as the angle of incline does, and as a result, force will as well.

The gravitational force acting on the cart increases as the slope of the incline increases, causing it to accelerate more quickly.The ramp's steepness will cause an increase in inclination. As a result, the acceleration increases as the inclination angle increases. This acceleration causes the object to descend with greater speed.

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The unit of a third-order reaction is mol-2L2s-1.

The total of the exponents that the concentration terms in the rate law are increased to determine the reaction's overall order. Take the products of the reaction aA+bB, for instance. Reactants A and B are in that sequence in the reaction, which is a and b, respectively. The reaction happens in the general order a+b.

The overall reaction sequence affects the units of the rate constant, k. M/s, 1/s, and 1/(Ms) are the units of k for zero-order reactions, first-order reactions, and second-order reactions, respectively.

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Using the planet's angle of greatest elongation, Copernicus was able to estimate the planet's distance from the sun.

The angle of greatest elongation is the angle between the sun and the planet, as viewed from Earth, when the planet is at its farthest point from the sun in its orbit. Copernicus realized that the greater the angle of elongation, the farther the planet was from the sun. He used this information to estimate the relative distances of the planets from the sun, which was a major contribution to the development of the heliocentric model of the solar system. This model placed the sun at the center of the solar system, with the planets orbiting around it in elliptical paths.

Copernicus' work paved the way for future astronomers to refine our understanding of the solar system and its place in the universe.

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Answer:

it's a rule like water !!!!

Explanation:

Most importantly, time appears to run forward always never backwards. in other words there's perceived arrow of time and there's thermodynamic arrow of time, and they always point in a forward direction

for every system there are more states that seem chaotic then states that seem ordered.

the arrow of time seems to have something to do with that tendency. but to get from one instance to another where things get more entropy, we already need some kind of time, gotta admit that.

some (physicists) believe that time is an illusion, that the whole universe is already set in stone, like a block (the idea is therefore called block universe). from the perspective of a godlike outside observer the universe would be like a book, or a 4D movie. the characters might feel a movement of things in a direction, but rewinding it wouldn't feel different in any instance because the order in wich things happen is already written.

a different idea is that there are infinite many different futures and the further they are away, the less we can know for sure about them in a physical way. and this might also be work for the past, so that different parts could lead to one present.

when macroscopic information is deleted, it might not be reversible, so the past gets ultimately blurry. one example for deletion of macroscopic information this is the Library of Alexandria wich burned down.

all the quantum information is still conserved, but the order of things (like letters on pages) is lost and could have been in different configurations before. we can't ultimately not even see the past, as much as we would try.

personally the idea that the past is written in stone but the future is in flux doesn't make any sense for me. because than I could have free will now, but not from the perspective 10 days later.

the present would be a very special thing than, the stage where the universe likes to play.

maybe we can get a grasp on time if we look at it like rules for a game, like a cardboard game.

To get from one configuration to the next ,we must follow rules. like throwing dice and moving in monopoly.

gravity would be a simple real world example for such a rule, a natural law.

But no one would have a firm clue where this rules came from.

TLDR: I don't know and neither does anyone else for sure, not even top notch scientists.

the hardest questions are easy to formulate, but maybe even impossible for us to answer in a satisfying way. I hope we will understand those hard questions better one day, and maybe even get answers.

If the wall or building were not perpendicular to the ground, it would introduce errors in the measurements and calculations, while using a tape measure introduces uncertainty, and the accuracy of reading a protractor depends on the specific protractor and the observer's skill.

If the wall or building were not perpendicular to the ground, it would affect the accuracy of the measurements and calculations in the previous experiments. The angles and distances involved in the calculations would be different, leading to potential errors in the results.

Using a tape measure to measure the sides of the triangle introduces uncertainty due to potential measurement errors, such as parallax or slight stretching of the tape measure. These errors can affect the accuracy of the triangle's side lengths and consequently the calculated values.

The degree of accuracy when reading a protractor depends on the precision of the protractor and the observer's ability. Protractors typically have markings for every degree and sometimes subdivisions for half or quarter degrees. With careful observation and estimation, it is possible to read a protractor to the nearest degree or even estimate angles within a few degrees of accuracy. However, the exact degree of accuracy would depend on the specific protractor and the skill of the person using it.

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It will now emit at a rate of 160 W.

the proportion of an emitter's energy to that of a blackbody, a perfect emitter with the same temperature, wavelength, and viewing circumstances. It ranges from 0 (for the optimum reflector) to 1 and has no dimensions (for a perfect emitter).

The ability to reliably measure temperature using an infrared temperature sensor or a thermal imaging camera depends critically on emissivity, which measures a material's capacity to radiate infrared energy from its surface.

The type of surface affects a surface's emissivity in addition to the material. A smooth and polished metal surface will have a low emissivity in contrast to a roughened and oxidized metal surface, which will have a high emissivity.

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We measure an object's internal kinetic energy by observing its motion and calculating the kinetic energy ,whereas the thermal energy transferred from one object to another is transferred from one object to another is measured through the process of heat transfer

We measure an object's internal kinetic energy by observing its motion and calculating the kinetic energy using the formula\(1/2 mv^2\), where m is the mass of the object and v is its velocity. Internal kinetic energy refers to the energy associated with the movement of particles within the object itself. This energy is related to the object's temperature and the average kinetic energy of its constituent particles.

On the other hand, thermal energy transferred from one object to another is measured through the process of heat transfer. Heat transfer occurs when there is a temperature difference between objects, causing energy to flow from the object with higher temperature to the object with lower temperature. The amount of thermal energy transferred is typically measured using instruments such as thermometers or calorimeters.

There are different methods of heat transfer: conduction, convection, and radiation. In conduction, heat is transferred through direct contact between objects or through a conductive medium. In convection, heat is transferred through the movement of fluids, such as air or water. Radiation involves the transfer of thermal energy through electromagnetic waves, such as heat radiated from the sun.

It is important to note that internal kinetic energy and thermal energy are related but distinct concepts. Internal kinetic energy refers to the energy associated with the motion of particles within an object, while thermal energy refers to the overall energy associated with the temperature of an object or the transfer of heat. Both quantities are important in understanding the behavior and properties of objects and systems.

In summary, we measure an object's internal kinetic energy by observing its motion and calculating the kinetic energy using appropriate formulas. Thermal energy transferred from one object to another is measured through the process of heat transfer, which can be quantified using various instruments and methods depending on the specific situation.

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