A painter (of mass 79 kg) needs to reach out from a scaffolding to paint the side of a building, so he lays a plank across two bars of the scaffolding, and puts a heavy bucket of mass 23 kg directly over one of the bars (see figure). You can assume the plank is massless, and is long enough to reach to the other building. Show answer no attempt if the bars are separated by a distance 2. 9 m, how far, d, from the bar on the the right can the painter walk before the plank starts to fall?

Answer:

B

Explanation:

Answer:

The group one element are called alkali because when they dissolved in water they form alkaline solutions

Answer:

1226.25 N

Explanation:

w = mg = 125 (9.81) = 1226.25 N

The term personality traits has to do with the essentials of a person. One of the five big  personality trait that affects people negatively if they have to much of it is neuroticism.

The term personality traits refers to those traits that characterize an individual. They have the capacity to affect a person positively or negatively.

One of the five big  personality trait that affects people negatively if they have to much of it is neuroticism.

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In a perfectly inelastic collision, where the two bodies stick together after the collision, the percentage of kinetic energy transferred to other forms of energy is 100%.

The mass and velocity of the colliding bodies have a direct relationship with the amount of kinetic energy transferred to other forms of energy. A higher mass will result in a larger amount of kinetic energy being transferred, as more force is required to bring the two bodies to a stop. Similarly, a higher velocity will result in a greater amount of kinetic energy being transferred, as the bodies have more kinetic energy to lose during the collision. Both mass and velocity contribute to the total kinetic energy of the colliding bodies and therefore the amount of kinetic energy that will be transferred to other forms of energy in the collision.

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The satement is true.

This comes from the fact that, according to Einstein:

and since c² is a very large number then, if we find a way to convert all the mass in energy a small amount will produce a large amount of energy.

Answer:

Please find attached, the required wave drawn with MS Excel

Explanation:

Functions that represent waves is given as follows

A general form of the wave equation is A·sin(B·x) + D

Where;

B = 2·π/T

T = The period of the wave = 1/f

D = The vertical shift of the wave = 0

A = The amplitude of the wave = 1 for sine wave

v = The wave velocity

λ = The wavelength of the wave

f = The frequency of the wave

v = f·λ

At constant v, λ ∝ 1/f  

∴ λ ∝ T

Where T = 3, we have;

B = 2·π/T

∴ B = 2·π/3

Therefore, we have the wave with an amplitude of 1 cm, and wavelength, 3 cm, given as follows

y = sin((2·π/3)·x)

Plotting the above wave with MS Excel, we can get the attached wave

Answer:

73.34 mph to 2dp

Explanation:

veolcity = distance/ time

55 / 0.75 = 73.34 mph

False. Two identical counter-propagating traveling waves on a string will produce a standing wave with the same amplitude as the individual traveling waves when they overlap.

When two identical waves with the same amplitude and wavelength move in opposite directions and interfere constructively, they form a standing wave with nodes and antinodes. The nodes are points on the string that do not move, while the antinodes are points on the string that experience the maximum displacement.

The amplitude of the standing wave depends on the amplitude and phase of the two traveling waves, but in general, it is not twice the amplitude of the individual waves. Instead, it can vary from zero at the nodes to a maximum at the antinodes. The specific amplitude of the standing wave depends on the wavelength, frequency, and other properties of the string, as well as the boundary conditions at the ends of the string.

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The reason why the specimen in an electron microscope must be placed in a vacuum within a sealed chamber is to prevent any interference from air molecules or other contaminants. This is essential because electron microscopes use a beam of electrons to illuminate the specimen, and the presence of air molecules could scatter the electrons, leading to a reduction in image quality and resolution.

By creating a vacuum within a sealed chamber, the electron microscope ensures an unobstructed pathway for the electron beam, resulting in a clearer and more detailed image of the specimen. In a vacuum chamber, the vacuum bag is placed inside a sealed chamber with the mouth of the vacuum bag placed between two sealing bars. Air is pumped out of the entire chamber, effectively squeezing the air out of the vacuum bag before it is automatically heat-sealed when a desired pressure is reached. So, the reason why the specimen in an electron microscope must be placed in a vacuum within a sealed chamber is to prevent any interference from air molecules or other contaminants.

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Grating spacing, d, is expressed as d = 1/n, where n is the number of grooves per centimeter. The numerical value of d is 1/2750 cm per groove.

In part (a), the relationship between the grating spacing, d, and the number of grooves per centimeter, n, is established as d = 1/n. This equation allows us to express the grating spacing in terms of the groove density.

In part (b), we convert the given value of n from grooves per centimeter to centimeters per groove. By reciprocating the value, we find that each groove occupies 1/2750 cm of space. Thus, the numerical value of d is determined as 1/2750 cm per groove.

The calculation helps us understand the physical spacing between adjacent grooves on the grating, providing a basis for further analysis in subsequent parts of the question.

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Answer:

The answer Is B.

Explanation:

The cats acceleration is decreased

by air resistance.

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Answer:

1.83 meters

Explanation:

1 meter = 100 cm

183cm/100cm= 1.83 meters

Electromagnetic radiation is a form of energy that travels in waves and includes a wide range of frequencies and energies. Different types of electromagnetic radiation have varying amounts of energy associated with them.

In order of decreasing energy, the types of electromagnetic radiation you provided can be arranged as follows:

So, the correct order from highest to lowest energy is:

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Answer:

0

Explanation:

When water is pumped out of well A, it causes a drop of 7 inches at point C; if water is pumped from well B into well A (at the same rate the water is pumped out of well A), then it will give a rise of 7 inches at well C. Therefore the net drawdown at well C is:

S = 7-7 = 0

Answer:

2000

Explanation:

ddoes rest : add the components

The term used for the amount of heat per unit mass required to raise the temperature of a substance one degree Celsius is specific heat.

Specific heat is the amount of heat energy per unit mass required to raise the temperature of a substance by one degree Celsius. It is measured in units of Joules per kilogram per degree Celsius (J/kg°C). Specific heat is an important factor in the study of thermodynamics and heat transfer, as it describes the amount of energy required to change the temperature of a substance. It is also determined by the type of atoms or molecules that compose the substance, as well as the type of bonds between them. It is also used to calculate the energy required to heat or cool a substance, as well as to determine the power of a given system.

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The  speed describes as :  A scalar quantity with magnitude only. So, option (A) is correct.

Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.

Some more information about speed:

When an object travels the same distance in the same amount of time, it is said to be moving at a uniform speed.

When an object travels a different distance at regular intervals, it is said to have variable speed.

Average speed is the constant speed determined by the ratio of the total distance travelled by an object to the total amount of time it took to travel that distance.

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Answer: To calculate the mass of the helium sample, we can use the ideal gas law equation, which relates the pressure, volume, temperature, and amount of gas for an ideal gas:

PV = nRT

Where:

P = pressure of the gas

V = volume of the gas

n = amount of gas in moles

R = universal gas constant

T = temperature in Kelvin

Given information:

Pressure (P) = constant pressure during the process

Initial temperature (T1) = 283 K

Final temperature (T2) = 393 K

Work done by the gas (W) = 40 J

Universal gas constant (R) = 8.31451 J/mol · K

Since the pressure is constant, we can rearrange the ideal gas law equation to solve for the amount of gas (n) in moles:

n = (PV) / (RT)

Substituting the given values into the equation:

n = (constant pressure during the process * volume) / (universal gas constant * temperature)

Now we can calculate the amount of gas in moles.

Next, we can convert the amount of gas from moles to grams using the molar mass of helium (He), which is approximately 4 g/mol.

Finally, we can multiply the mass in grams by 1000 to convert it to grams.

Let's plug in the numbers and do the calculations:

P = constant pressure during the process

V = volume of the gas (not given in the question, need additional information)

R = universal gas constant = 8.31451 J/mol · K

T1 = initial temperature = 283 K

T2 = final temperature = 393 K

W = work done by the gas = 40 J

Molar mass of helium (He) = 4 g/mol

Please provide the value for the volume (V) of the helium gas in order to complete the calculation.

The rate of heat loss through a window covered with a 0.750 mm-thick layer of paper (thermal conductivity 0.0500 W/m⋅K) can be calculated using the formula:

q = kA (T1 - T2)/d

where q is the rate of heat loss, k is the thermal conductivity of paper (0.0500 W/m⋅K), A is the area of the window, T1 is the temperature inside the room, T2 is the temperature outside, and d is the thickness of paper (0.750 mm).

Assuming that the temperature inside the room is 20°C and outside temperature is 5°C, and that the area of the window is 1 m², we can calculate:

q = (0.0500 W/Mrk) × (1 m²) × (20°C - 5°C) / (0.750 mm)

q = 6.67 W

Therefore, if you cover your window with a 0.750 mm-thick layer of paper with thermal conductivity of 0.0500 W/m⋅K, you can expect to lose heat at a rate of approximately 6.67 W.

The air directly above is warmed by the ground, which is warmed by the Sun. Warm air near the surface enlarges and loses density relative to the ambient air. The lighter air expands at the reduced pressure at higher altitudes, which causes it to climb and cool. When it cools to the same temperature as the surrounding air and reaches that density, it stops rising.

A thermal is connected to a downward flow that surrounds the thermal column. At the top of the thermal, colder air is ejected, which causes the outside to move downward. The troposphere's (lower atmosphere's) characteristics have an impact on the size and power of thermals.

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The average emf induced in the coil is 0. 533 V. The average emf induced in the coil can be calculated using Faraday's law of electromagnetic induction. The formula for the average emf induced in a coil is given by:

E = N * (ΔΦ / Δt)

where E is the average emf, N is the number of turns in the coil, ΔΦ is the change in magnetic flux, and Δt is the time interval.

In this case, the number of turns is 80, and the time interval is 0.0600 s. The change in magnetic flux can be calculated by finding the initial and final flux values.

The initial flux is given by Φ1 = B * A * cos(θ1), where B is the magnetic field, A is the area of the coil, and θ1 is the angle between the coil and the magnetic field.

The final flux is given by Φ2 = B * A * cos(θ2), where θ2 is 90 degrees since the coil is perpendicular to the field.

Substituting the values into the formula, we have:

\(E = 80 * (Φ2 - Φ1) / Δt\)

Calculating the values, we find:

\(Φ1 = (1.10 T) * (0.25 m) * (0.40 m) * cos(37.0°) = 0.536 WbΦ2 = (1.10 T) * (0.25 m) * (0.40 m) * cos(90°) = 0.110 WbΔΦ = Φ2 - Φ1 = 0.110 Wb - 0.536 Wb = -0.426 Wb\)

Substituting the values into the formula, we get:

E = 80 * (-0.426 Wb) / 0.0600 s = -0.568 V

Taking the absolute value, the average emf induced in the coil is 0.568 V or approximately 0.533 V.

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The acceleration due to gravity on the moon, as determined from the given data, is approximately 0.7095 m/s².

To determine the velocity at each time and calculate the acceleration due to gravity on the moon, we can use the kinematic equations. The velocity can be obtained by calculating the change in position over the change in time.

Using the provided data, we can complete the table as follows:

Time (s) Position (m) Velocity (m/s)

0.0000 0.1000 0 (initial velocity)

0.2000 -0.0081 (0.1000 - (-0.0081)) / (0.2000 - 0.0000) ≈ 0.5417

0.3000 -0.0326 (-0.0081 - (-0.0326)) / (0.3000 - 0.2000) ≈ 0.2533

0.4000 -0.0733 (-0.0326 - (-0.0733)) / (0.4000 - 0.3000) ≈ 0.3957

0.5000 -0.1304 (-0.0733 - (-0.1304)) / (0.5000 - 0.4000) ≈ 0.5543

Now, let's calculate the acceleration due to gravity on the moon. We can assume that the object is in free fall, and the only force acting on it is gravity. The acceleration due to gravity on the moon is approximately 1/6th of the acceleration due to gravity on Earth (9.8 m/s²).

Using the velocity values at different times, we can calculate the acceleration using the formula:

Acceleration = (Final Velocity - Initial Velocity) / Time

Acceleration at 0.2 s = (0.5417 - 0) / 0.2 ≈ 2.7085 m/s²

Acceleration at 0.3 s = (0.2533 - 0.5417) / 0.1 ≈ -2.8834 m/s²

Acceleration at 0.4 s = (0.3957 - 0.2533) / 0.1 ≈ 1.424 m/s²

Acceleration at 0.5 s = (0.5543 - 0.3957) / 0.1 ≈ 1.586 m/s²

Since the object is in free fall, the acceleration is equal to the acceleration due to gravity. Taking the average of the calculated accelerations:

Average Acceleration = (2.7085 - 2.8834 + 1.424 + 1.586) / 4 ≈ 0.7095 m/s²

Therefore, the acceleration due to gravity on the moon, as determined from the given data, is approximately 0.7095 m/s².

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Answer:KE

Explanation:

Answer:

\(a=\dfrac{v-u}{t}\)

Explanation:

The acceleration of an object is the rate of change of velocity. The mathematical expression for the acceleration of an object is given by :

\(a=\dfrac{v-u}{t}\)

Where

v and u are final and initial velocities

t is time

or we can write acceleration as :

\(a=\dfrac{\Delta v}{\Delta t}\)

Hence, this is the required solution.

Because of how large Earth is, an ant's exploration of it makes it appear flat. It appears that the Big Bang theory explains how components were created in the first few minutes following the Big Bang.

Contrary to popular belief, Earth doesn't provide an official international name. The word "Terra" is merely a common misunderstanding of the scientific name for the planet. "Earth" is the commonly used English name for the planet, particularly in scientific contexts.

A planet like the Earth revolves around a star called the sun. A star is typically understood to be a mass of gas that is sufficiently massive and dense to enable nuclear fusion to occur at its core.

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Electrons do display wavelike properties, just like photons. This phenomenon is known as wave-particle duality. When an electron gun emits electrons one at a time, and these electrons travel through a double slit to a detector screen, the pattern that appears on the screen is known as an interference pattern.

This pattern is formed due to the wave nature of electrons, which allows them to interfere with themselves.

As electrons pass through the double slit, they form a diffraction pattern, which is similar to the pattern formed by a photon.

This diffraction pattern creates areas of constructive and destructive interference, leading to the formation of an interference pattern on the detector screen.

The interference pattern is a series of light and dark fringes that demonstrate the wave-like nature of electrons.

Therefore, the pattern that would appear on the detector screen after many electrons are emitted would be an interference pattern consisting of bright and dark fringes.

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Under the Big Top elephant, Ella (2500 kg), is attracted to Phant, the 3,000 kg elephant. They are separated by 8