What type of cells don't have cell walls.

Answer:

Work Definition in Chemistry

Work Definition . Work is the energy required to move an object against a force. ...

Mechanical Work . Mechanical work is the type of work most commonly dealt with in physicsand chemistry. ...

PV Work . Another common type of work is pressure-volume work. ...

Sign Convention for Work . Work performed by the system on the surroundings has a negativesign. ...

Explanation:

The focal length of the power lens is 54.05 mm.

The focal length of reading glasses found on the rack in a pharmacy depends on its lens power. Lens power can be defined as the ability of the optical device to see. It can be represented by a dioptre unit. The relaxed power formula is

P = 100/f

where P is the power of the lens in dioptre, and f is the focal length.

From the question above, the given parameter is

P = 1.85 d

By substituting the given parameters, we can calculate the focal length

P = 100/f

1.85 = 100/f

f = 54.05 mm

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Answer:

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question we have

momentum = 2000 × 3

We have the final answer as

Hope this helps you

The energy delivered to the eardrum when someone whispers a secret in your ear at 20 dB is approximately 1 picowatt.


The amount of energy delivered to the eardrum is determined by the sound pressure level (SPL) of the sound waves. Whispering produces an SPL of around 20 dB, which is considered to be a soft sound. The energy delivered to the eardrum can be calculated using the formula E=I x t, where E is energy, I is intensity, and t is time.  

Assuming a typical ear canal area of 10 mm², the intensity of the sound would be approximately 0.1 microwatts per square meter. Multiplying this by the ear canal area gives an intensity of 1 nanowatt. As the whispering lasts for about 0.1 seconds, the energy delivered to the eardrum would be approximately 1 picowatt.

This amount of energy is very small compared to the energy levels of normal conversation or loud music, which can cause hearing damage over time. However, it is still enough to stimulate the auditory system and allow us to hear the whispered secret.

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Wavelength affects a wave's energy; the longer its wavelengths, the lesser the energy. Gamma rays therefore have the maximum energy and long radio waves the lowest in the electromagnetic spectrum.

The slowest seismic waves are surface waves. They move at a speed of 1.5 miles per second, or 2.5 km. Surface waves come in two different varieties. Love waves slither from side to side like a snake.

Low-energy photons make up radio waves; microwave photons contain a little more energy as radio waves; infrared photons have much more energy; and the most energetic photons of them are gamma rays.

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Answer:

The ball will continue to travel at 18 m/s horizontally

When the ball hits the ground it will have a horizontal component equal to that of the car window (it continues to move at 18 m/s horizontally)

When physical pendulum is selected, the plus sign results in an improbable value for d(d=1.5>L). A physically significant result is obtained if we use the minus sign: d=0.056m.

A baseball club swinging back and forward on is an illustration of a physical pendulum. A physical pendulum can undergo simple harmonic motion in exactly the same manner that a simple pendulum can under specific circumstances.

The only physical aspect of a basic pendulum that influences its period has been its length. The object's mass has no bearing on the era. The period of a compound pendulum depends on both the mass of the object and whether that mass is distributed.

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The electric in a region surrounding the origin is uniform and along the x-axis. Then, the potential is minimum at A.

Electricity is a form of energy resulting from the presence and flow of electric charge. It is a natural phenomenon that occurs in nature, such as lightning, and can also be produced artificially through the use of electrical devices. It is a fundamental part of the universe, and is used to power almost everything in our lives. Electric energy is created when electrons move from one atom to another. This movement of electrons can be done through a conductor, such as a wire, creating an electric current.

The electric field is uniform and along the x-axis. This means that the electric field is constant along the x-axis, and thus the potential is also constant along the x-axis. Since Point A is located on the x-axis, it has the same potential as the origin, which is the minimum potential of the region. Hence, the potential is minimum at Point A.

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Answer:

Explanation:

theey carry it together

The half power beamwidth for a parabolic reflector is 3.42 degrees.

We know that the directivity (D) of an antenna is given by, D=4π/λ2 × G where λ is the wavelength of the signal in meters and G is the directive power gain of an antenna. In this question, we will calculate the directivity of the antenna, and from that, we will find the half-power beamwidth of the parabolic reflector.

Directivity (D) = 10^(G/10) = 10^(30/10) = 1000

Directivity (D) = 4π/λ^2 × G = 1000λ^2

= 4π/Gλ = 4π/(1000 × D)λ

= 4π/(1000 × 10.^(30/10))λ

= 0.1227 m

Now, the half power beamwidth can be calculated as:

Half power beamwidth = 70(λ/D)^0.5

Half power beamwidth = 70(0.1227/1000)^(0.5)

Half power beamwidth = 3.42 degrees, approximately.

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Explanation:

p = mv ---> let v --> 2v (velocity is doubled) then

p' = m(2v)

= 2(mv)

= 2p

so the momentum also doubled

The wave speed on the string is 82.0m/s. The maximum wavelength for a standing wave is 16.8 m. That wave's frequency is 4.88Hz.

(a) V=\(\sqrt{\frac{T}{\mu} } =\sqrt{\frac{96}{\frac{0.12}{8.4} } }\)  = 82 m/sec

(b) for the lowest possible wavelength,

λ/2=l

λ=2l=2×8.4=16.8m

(c) V=fλ=v/λ=82/16.8=4.38Hz

the separation between the corresponding points of two successive waves is known as the wavelength. Two points or particles that are "corresponding points" are those that have finished the same fractions of their periodic motion and are in the same phase. Ordinarily, the wavelength of transverse waves—those with points vibrating perpendicular to the direction of their advance—is calculated from crest to crest or from trough to trough; for longitudinal waves—those with points vibrating parallel to the direction of their advance—the wavelength is calculated from compression to compression or from rarefaction to rarefaction. The Greek letter lambda () is commonly used to represent a wave's length. Wavelength is defined as the product of the speed (v) and frequency (f) of a wave train in a given medium.

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3. An electronics company is manufacturing circuit boards.They want to use minimum wire to connect the pins in a way that there are exactly two connected components of any size.

The wire needed to connect each pair of pins is given by the distance between them. How should they arrange the pins to minimize the total length of wire needed?

To minimize the total length of wire needed, the electronics company can use a specific arrangement of pins known as a "Minimum Spanning Tree" (MST). A Minimum Spanning Tree is a connected subgraph of the original circuit board graph that includes all the pins while minimizing the total length of the edges (wires) used.

The company can follow these steps to determine the optimal pin arrangement:

1. Create a graph representation of the circuit board, where each pin is represented by a vertex and the distance between two pins is represented by the weight of the edge connecting them.2. Apply a suitable algorithm for finding the Minimum Spanning Tree of the graph, such as Kruskal's algorithm or Prim's algorithm.

3. The resulting Minimum Spanning Tree will provide the arrangement of pins that minimizes the total length of wire needed while ensuring that there are exactly two connected components of any size.

By using this approach, the electronics company can achieve an efficient and optimized wiring configuration for their circuit boards.

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The frequency of oscillation for the spring system of part i is 0.719 Hz.

Explanation: The frequency of a system is a measure of the number of cycles it completes per second, which is proportional to the square root of the ratio of the spring constant to the mass of the system.

In this case, the spring constant is given as k=2.5 N/m and the mass of the system is given as m=0.35 kg. Plugging these values into the equation for frequency, we get frequency (f) = 1/2π * sqrt(k/m) = 1/2π * sqrt(2.5/0.35) = 0.719 Hz. This result can be rounded to three decimal places, giving us 0.719 Hz.

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The Rio Grande is one of the largest river systems in the United States, running over 3,000 kilometers from the mountains of Colorado to the Gulf of Mexico. The river flows from north to south and passes through several states, including Colorado, New Mexico, and Texas.

A comparison of the discharge of the Rio Grande at Albuquerque and at Otowi Bridge (located upstream, near Santa Fe) is as follows: Albuquerque: It is the largest city in New Mexico, situated in the central part of the state. The Rio Grande flows through the city, where it is dammed to form a large lake known as Elephant Butte Reservoir. The discharge of the Rio Grande at Albuquerque is around 100 cubic feet per second (cfs) during normal conditions.

This means that the river has twice the volume of water at Otowi Bridge than at Albuquerque.During times of drought, the river's discharge can drop to dangerously low levels, affecting wildlife and human communities that rely on the river for water. The river's discharge can also increase during periods of heavy rainfall or snowmelt, leading to flooding in downstream communities.

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Different measurement scales, such as ratio scale, equal-interval, rank-order, and nominal, are used in many disciplines, including statistics and the social sciences.

A. Letters of the alphabet:

Nominal: Without any intrinsic order or numerical value, the letters of the alphabet indicate categories or labels.

Discrete: Each letter is unique and cannot be divided into more compact parts.

B. Time of day:

Equal-Interval: A continuous scale with equal gaps between each unit (such as minutes or seconds) is what the term "time of day" represents.

Continuous: Any fractional value between units is possible when measuring time as a continuous variable (for example, 12:15, 12:30, or 12:45).

C. Medals Won in the Olympics:

Rank-Order: Olympic medals can be rated according to level of accomplishment (for example, gold, silver, and bronze).

Discrete: The total number of medals earned cannot be divided further because it is a whole number.

D. Percent score from a memory test:

Ratio Scale: A score of 50% is half of a score of 100%, for example, and percentage scores from memory tests can be compared using ratios because they have a meaningful zero point.

Continuous: Percent scores allow for fractional values and can range from 0 to 100.

E. Number of teen pregnancies in San Clemente:

Ratio Scale: A scale with a meaningful zero point and the capacity to compare ratios can be used to calculate the number of teen pregnancies.

Discrete: Pregnancies are counted as a whole; they cannot be subdivided into smaller numbers.

F. G.P.A.:

Equal-Interval: A continuous scale with equal distances between each unit is represented by the GPA (for example, 2.0, 2.5, and 3.0).

Continuous: Any value within a range, including fractional values (like 3.75), can be used for G.P.A.

G. Food Grades at Restaurants:

Rank-Order: Restaurants may rate their food using a letter grading system (A, B, C, etc.).

Discrete: There is no more subdividing the grades because they are separate groups.

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Answer:

v = 17.68 m/s

Explanation:

Given that,

While standing at a crosswalk, you hear a frequency of 510 Hz from an approaching police car.

After the police car passes, its frequency is 460Hz.

We need to find the speed of the police car.

The formula is as follows :

\(v=\dfrac{v_o(f-f')}{f+f'}\)

Put all the values,

\(v=\dfrac{343(510-460)}{510+460}\\\\=17.68\ m/s\)

So, the speed of the police car is 17.68 m/s.

To determine the number of storage bits required in the controller memory for the twisting joint (type T) of the industrial robot, we need to calculate the repeatability, round the deviations to a reasonable precision, and then calculate the number of addressable positions based on the range of the joint and the chosen accuracy level.

First, let's calculate the repeatability of the joint. Given that the range of rotation is 322°, the repeatability can be calculated as 6 times the standard deviation. Since the standard deviation is a measure of how spread out the data is, multiplying it by 6 ensures that the accuracy of the joint is as close as possible to, but less than, its repeatability.
Next, let's analyze the given data. The 10 samples of deviations from the commanded angles are: 0.176, 0.04, -0.345, 0.079, 0.309, -0.004, -0.102, 0.12, 0.075, and 0.1.
To calculate the standard deviation of these deviations, we need to find the mean and then calculate the differences from the mean. Squaring these differences and taking the average will give us the variance, which we can then take the square root of to obtain the standard deviation.

After calculating the standard deviation, we multiply it by 6 to obtain the repeatability.
Now, to determine the number of storage bits required, we need to consider the accuracy of the joint. The accuracy depends on the precision required for representing the deviations. Assuming a reasonable level of precision, we can round the deviations to, for example, 3 decimal places.
Finally, the number of storage bits required in the controller memory can be calculated by multiplying the range of the joint (322°) by the accuracy (e.g., 0.001°, considering 3 decimal places). This will give us the number of addressable positions, which can be represented by the required number of storage bits.

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Answer:

2. Letter C all those in the list are non living

3. Letter A a skunk is a living organism that shapes its environment

5. Letter A when talking about population it usually refers to a single type of species in that area

6. Letter B Niche (just recently heard of the word in ecology)

The transfer function is Vc(s)/Vs(s) = (R + 1/(sC)) / (sL + R + 1/(sC)), the pole-zero map includes poles at -R/L and zeros at -1/(sC), the response to Vs(t) = u(t)V can be calculated using inverse Laplace transform techniques and the response to Vs(t) = o(t)V can also be determined using inverse Laplace transform techniques.

To find Vc(s)/Vs(s), we need to consider the given electrical system with components R, L, and C. By applying Kirchhoff's laws and solving for the output voltage Vc(s) and input voltage Vs(s) in the Laplace domain, we can derive the transfer function as (R + 1/(sC)) / (sL + R + 1/(sC)).

The pole-zero map provides insights into the stability and behavior of the system. In this case, the transfer function has poles at -R/L, indicating a time constant associated with the system's dynamics. The transfer function also has zeros at -1/(sC), which affect the frequency response characteristics.

To find the response to Vs(t) = u(t)V, where u(t) represents the unit step function, we can apply inverse Laplace transform techniques to the transfer function Vc(s)/Vs(s). This will yield the time-domain response of the system to a step input.

Similarly, to find the response to Vs(t) = o(t)V, where o(t) represents the unit impulse function, we can use inverse Laplace transform techniques on the transfer function Vc(s)/Vs(s). This will give us the time-domain response of the system to an impulse input.

By calculating the inverse Laplace transforms of the transfer functions in cases 3) and 4), we can obtain the time-domain responses of the electrical system to the respective inputs.

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An object that is negatively charged could contain only electrons with no accompanying protons is False.

Define static electricity.

When two or more bodies come into touch and then break apart, static electricity results. The transport of electrons from one atom to another is caused by this interaction between surfaces.

Protons are present in negatively charged things, but their electron count exceeds that of their protons. Positively charged particles include atoms, molecules, and ions that have fewer electrons than protons. On the other hand, a particle is considered to be negatively charged if it has more electrons than protons.

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Answer:

1

Explanation: that is the ratio

The momentum of the 5kg object before the collision is; 50kgm/s.

The momentum of a body is mathematically evaluated as the product of its mass and velocity of motion.

According to the question;

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A. The potential energy of the payload relative to the bottom of the shaft is equal to the product of the payload's mass and the gravitational acceleration, multiplied by the height of the shaft: PE = mgh = (45 kg)(9.81 m/s2)(132 m) = 58,158 J.

Potential energy is the stored energy of an object due to its position or condition. It is the ability of an object to do work, based on its position or state. Potential energy is the energy held by an object because of its position relative to other objects or a force, such as gravity. When an object is held above the ground, it has potential energy because of the force of gravity acting on it. If a book is resting on a shelf, it has potential energy because of its position.

B. The payload's speed at the bottom of the shaft is equal to the square root of 2 times the gravitational acceleration multiplied by the height of the shaft: v = √2gh = √2(9.81 m/s2)(132 m) = 44.7 m/s. This converts to about 101 mph.

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Answer: Exothermic

Explanation:

An exothermic reaction causes an increase in temperature. This is because the energy released when the bonds are broken among the reactants is greater than than the energy absorbed when new bonds are formed among the products. This leftover energy gets passed along to the surroundings, where it produces a measurable increase in heat.

We cannot determine the work required to pump all the water over the top of the sphere without knowing the value of rho. The work is directly proportional to the weight, which depends on the density of the water.

To calculate the work required to pump all the water over the top of the sphere, we can use the concept of potential energy.

First, let's find the volume of the water in the tank. Since the tank is half-filled, the volume of water will be half the volume of the sphere. The formula for the volume of a sphere is \(V = (4/3)πr^3\), where r is the radius. Plugging in the given radius of 2, we find \(V = (4/3)π(2^3)\)= 33.51 cubic units (approximately).

Next, we need to find the weight of the water. The weight of an object can be calculated using the formula weight = mass x acceleration due to gravity. The mass of the water can be found using its density, which is represented by the symbol "rho" in the question. However, the value of rho is not given, so we cannot calculate the weight directly.

Therefore, we cannot determine the work required to pump all the water over the top of the sphere without knowing the value of rho. The work is directly proportional to the weight, which depends on the density of the water.

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The work to pump water over the top of the sphere is the integral of the product of the volume of water in each infinitesimal layer, the height of the layer from the top of the tank, and gravity. This involves calculus, kinetic energy principles, and the concept of work.

The question concerns the calculation of the work required to pump water out of a spherical tank. Since we are dealing with a half-full sphere of radius 2, the volume of water V in the sphere is given by (2/3)πr³. The density, ρ, and height of the water feature in the necessary calculations too.

Work, in this context, is the force of the water times the distance it has to be moved to the top of the sphere. The force involved is the weight of the water being moved, which is the volume of the water times the density, ρ, and gravity, g. On integrating over the volume of water in the tank, we obtain the work required to pump all the water over the top of the sphere.

The integration requires careful choice of limits for cylinder height, h, which makes the integration non-trivial. Note that this is an application of calculating work using notions from calculus and kinetic energy principles.

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The power delivered is 25 Watts (W) because Power = Work/Time = 50 J/2 seconds = 25 W.

Power is the rate at which work is done or energy is transferred. It is expressed as the amount of work done (in joules) divided by the time it takes to do the work (in seconds). Power is measured in units such as watts (W) or joules per second (J/s).

Power is an important concept in physics, engineering, and other sciences, as it allows us to understand the rate at which energy is used or transferred.

Calculation of power

Power = Work/Time

Power = 50 J/2 seconds

Power = 25 W

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Answer:

Below

Explanation:

A few basic equations to use:

Power = V I    

60 W = 240 v * I

   I = .25 A

Power = v^2 / R

  60    =  240^2 / R

           R = 960 ohms