Terzaghi's Bearing Capacity Equation Homework 1: Given: Square footing, ϕ=20
∘
,c=200psf,γ=110pcf, D
f
​
=4.0ft,P=500 kips, S.F.=3.0 Find: Area of the footing using Terzaghi's equation (general shear failure)

Answer:

it's true

mark me as brilliant please

Answer:

Einsteinium has 99 atomic number

Answer:

Just a cheerful teen willing to help,

Just a cheerful teen willing to help,stay salty!

Explanation:

Explanation: Einsteinium (Es), synthetic chemical element of the actinoid series of the periodic table, atomic number 99. Not occurring in nature, einsteinium (as the isotope einsteinium-253) was first produced by intense neutron irradiation of uranium-238 during the detonation of nuclear weapons.

Normal hearing falls within the range of 0 to 20 decibels (dB).

Decibels are a unit of measurement used to quantify sound intensity or loudness. In the context of hearing, decibels are used to measure the minimum sound level that a person with normal hearing can perceive across different frequencies.

The range of 0 to 20 dB represents the threshold of normal hearing, where an individual can detect sounds of various frequencies without any difficulty. This range includes the typical everyday sounds we encounter, such as conversations, background noise, and environmental sounds.

Sounds below 0 dB are considered quieter than the threshold of normal hearing, while sounds above 20 dB start to become louder and can potentially cause discomfort or damage to the ears, especially at higher levels.

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The magnitude of the friction force on the box is 36N.

The force applied by the man to push the box of mass 80kg is 180N.

the acceleration of the block is 1.80m/s².

Now, we know,

Acceleration = Net force/mass

A = F/M

Now, the net force will be applied force minus frictional force.

So, if the frictional force is Fr and the applied force is F, then we can write,

a = F-Fr/M

Putting values,

1.80 = 180-Fr/80

Fr = 36N.

So, the frictional force is 36N in magnitude.

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On a cold windy day when the outside air temperature is 10oC and the wind chill factor is -10oC, you feel colder than 10oC because of (c) convection.

Convection is the heat transfer that occurs between a surface and a moving fluid when the two are at different temperatures. When the air temperature is 10oC and the wind chill factor is -10oC, the wind blows cold air over your skin, removing the layer of heat that surrounds your body and making you feel colder than the actual temperature.The high specific heat of air, radiation, and conduction are not the reasons why you feel colder than 10oC. The specific heat of air refers to the amount of energy required to raise the temperature of air by one degree Celsius. Radiation is the transfer of heat through electromagnetic waves, and conduction is the transfer of heat through direct contact. These methods are not relevant in explaining why you feel colder than 10oC in this scenario.

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The maximum electric field strength if the wave is traveling in a medium in which the speed of the wave is 0.75c is 4 × 10^2 V/m.

The electric field strength can be calculated using the formula E = cB, where c is the speed of light and B is the magnetic field strength. Substituting the values, we get E = (3 × 10^8 m/s) × (5 × 10^−6 T) = 1.5 × 10^2 V/m.

However, since the wave is traveling in a medium in which the speed of the wave is 0.75c, the electric field strength will be different. The speed of the wave in the medium affects the relationship between the electric and magnetic fields. When the speed of the wave decreases, the electric field strength increases and vice versa.

To calculate the electric field strength when the speed of the wave is 0.75c, we need to use the formula E = (c/v)B, where v is the speed of the wave in the medium. Substituting the values, we get E = (3 × 10^8 m/s / 0.75c) × (5 × 10^−6 T) = 4 × 10^2 V/m.

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Answer:

\(a=\frac{v^2}{r}\)

\(v=\sqrt{a*r}\)

\(r=\frac{v^2}{a}\)

Explanation:

This is the formula for centripetal acceleration in terms of the tangential velocity (v) and the radius of the circular motion (r).  The expression for the acceleration is already given, so simply type it as shown:

\(a=\frac{v^2}{r}\)

For the velocity (v) multiply by "r" both sides and then use the square root to solve for v:

\(a*r=v^2\\v=\sqrt{a*r}\)

For the radius multiply both sides by r and then divide both sides by the acceleration (a) in order to isolate r completely:

\(a*r=v^2\\r=\frac{v^2}{a}\)

Answer:

B. 3

Explanation:

Based on the information provided, the BEST major for Dev to pursue would be Hospitality.

Force is a physical quantity that describes the interaction between two objects or systems. It is a vector quantity, which means that it has both magnitude and direction. Force can cause an object to accelerate, change direction, or deform. Force is typically measured in units of Newtons (N) in the International System of Units (SI). One Newton is defined as the force required to accelerate a mass of one kilogram at a rate of one meter per second squared. In other systems of measurement, such as the British system, force may be measured in units such as pounds or ounces. Some common examples of forces include gravity, friction, electromagnetic forces, and applied forces such as pushing or pulling. Understanding the concept of force is important in many areas of physics, engineering, and other sciences, as it helps explain how objects interact with each other and how they move and change over time.

Here,

This major would allow him to explore his passion for food and entertaining while also providing opportunities for hands-on experience and creativity. A degree in Hospitality can lead to careers in the food and beverage industry, hotel management, event planning, and more, all of which would offer the chance to work in dynamic, interactive environments rather than being stuck behind a desk all day.

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Debris collecting around pilings is most likely to create a boating hazard around river bridges.

The option (c) is the correct option.

Boating Hazards:

Dams, submerged items, freezing water, rapidly changing weather, sunstroke, and current are just a few of the dangers that boaters may encounter. It's not always easy to see these risks. These risks must be recognized by boaters, and they must always be prepared to prevent hazards.

Operator negligence is the most frequent reason for boating accidents, according to US Coast Guard (USCG) recreational boating statistics from 2019. Inattentiveness on the part of the operator can result in crashes, people falling overboard, and slip-and-fall incidents on board, all of which can result in life-threatening injuries.

The greatest places to find more about any potential local risks are marinas and local boaters. Check any nearby marine charts as well to learn about potential dangers and how to avoid them.

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According to Heisenberg's Uncertainty Principle, it is impossible to determine the position and momentum of a particle with absolute certainty at the same time. The Uncertainty Principle is defined as Δx * Δp ≥ h/4π, where Δx is the uncertainty in position, Δp is the uncertainty in momentum, and h is Planck's constant.
For the given problem, the uncertainty in position of a proton with mass 1.673 x 10-27 kg and kinetic energy 1.2 keV can be calculated as follows:

We know that the momentum p of a particle is given by p = mv, where m is the mass of the particle and v is its velocity.
The kinetic energy of the proton can be converted to momentum using the equation E = p²/2m, where E is the kinetic energy.
1.2 keV = (p²/2m)    (1 eV = 1.6 x 10^-19 J)
p²/2m = 1.92 x 10^-16 J
The momentum p of the proton can be calculated by taking the square root of both sides:
p = √(2mE) = √(2 x 1.673 x 10^-27 x 1.6 x 10^-16) = 7.84 x 10^-22 kg m/s

Using Heisenberg's Uncertainty Principle, we can calculate the uncertainty in position as follows:
Δx * Δp ≥ h/4π
Δx ≥ h/4πΔp
Substituting the values of h, Δp, and solving for Δx:
Δx ≥ (6.626 x 10^-34)/(4π x 7.84 x 10^-22)
Δx ≥ 2.69 x 10^-12 m

Therefore, the uncertainty in position of the proton is 2.69 x 10^-12 m.

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A baseball is thrown at a velocity of 98.4 miles per hour. The speed in m/s is approximately 43.73 m/s.

The velocity or speed means the amount of distance we have travelled per unit time.

The speed given is 98.4 miles/hour

V = 98.4 miles/hour

Since, 1 miles = 1.6 km = 1600 m

          1 hour = 3600 s

So the speed in metre per second is:

V = \(\frac{98.4 \times 1600}{3600} m/s\)

   \(\approx 43.73 \ m/s\)

Hence, the speed in m/s is approximately 43.73 m/s.

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If you were to rank relative frequency of the various forms of light, the rankings for the ones in part A would be different. Due to the direct relationship between energy and frequency, the ranking on frequency would follow the same pattern.

The amount of waves which pass a fixed place in a unit of time is referred to as frequency in physics. It also indicates how many vibrations or cycles a body undergoing periodic motion makes in a given amount of time.

The frequency of a sound pressure wave, also known as pitch, is indeed the amount of times per sec that this really repeats. The frequency of a drum beat is substantially lower than that of a whistle, while the frequency of a bullfrog cry is lower than that of a cricket. The number of oscillations decreases with decreasing frequency.

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Answer:

Fourteen yard (14) yard

Your question has been heard loud and clear.

Gallelio Galei is truly the father of modern sciences. Well I mean he had a cool beard , but he still was intelligent.

Thank you

Answer:

B is the best option but A is also good it's up to you but I'm leaning more towards B

Answer:

momentum after=momentum before

momentum before=Mbullet*Vbullet

Momentum after=(.49+.01)10=Mb*Vb

solve for V bullet

Explanation:

2.23 m/s^2 squared yung 2

Answer:

c.15

FA = Leffort / Llifting

\( \frac{30}{2} \)

=15

The one-dimensional crystal with lattice constant a can be described by the Schrödinger equation given as + V(z) * v(1) = E * v(1), (3.33) 2m d²r² where the crystal potential V(z) is periodic with wavelength a.Let's look at the detailed explanation of the given Schrödinger equation:

Here,E is the energy of the particle (in Joules or electron-volts) m is the mass of the particle (in kg) v is the wave function of the particle in the crystal V(z) is the periodic potential energy function in the crystal (in Joules or electron-volts) d²/dr² is the second-order derivative with respect to distance (r)We can simplify the given equation as:2m * [d²v(1)/dr²] + [V(z) - E] * v(1) = 0Let v(1) = Ae^(ikz).

Substitute the value of v(1) in the above equation, we get:A * {h²k²/2m + [V(z) - E]} * e^(ikz) = 0where h is Planck's constant.We can simplify the above equation as: h²k²/2m + [V(z) - E] = 0This is the expression for energy quantization in the crystal. Here, we see that the energy is quantized for a one-dimensional crystal with lattice constant a, and depends on the wave vector k.

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The four forces acting on the plane are:

• Thrust. The force that makes the plane moves in the direction of the motion.

• Drag: Force that act opposite of the motion.

• Lift: The force that holds the plane in the air.

• Weight.

If the pilot wants the plane to stay stable he needs to make sure that the forces on the plane are balanced. In any other case the plane will be going up or down.

Answer:

Sleeping

Explanation:

Driving in traffic is stressful because you may be late for wherever you are going,

Opening a birthday present is stressful because you don't know what is inside until you open it.

Watching a soap opera is stressful because you do not know what will happen next,

Sleeping is not stressful as long as you don't bring stressful topics to bed.

Answer:

Explanation:

so its half?

________

loading...

The minimum distance that mirror M1 needs to be moved so that no light will be detected at D1 is 180 nm

To find the minimum distance that mirror M1 needs to be moved so that no light will be detected at D1, we need to use the equation for destructive interference:

Δx = (m + 1/2)λ

Where Δx is the minimum distance, m is an integer, and λ is the wavelength of the light. In this case, we want to find the minimum distance for destructive interference, so we will use m = 0:

Δx = (0 + 1/2)(360 nm)

Δx = 180 nm

Therefore, the minimum distance that mirror M1 needs to be moved so that no light will be detected at D1 is 180 nm.

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The notch sensitivity and fatigue stress concentration factors for the bar are calculated to determine the mean and alternating stresses and find the fatigue strength for different cycles.

To calculate the notch sensitivity and fatigue stress concentration factors, we need to consider the presence of the 10 mm hole in the center of the 30 mm side of the bar. The notch sensitivity factor quantifies the effect of the hole on the stress concentration, while the fatigue stress concentration factor determines the increase in stress due to cyclic loading.

The mean stress (σm) is the average of the minimum (F_min) and maximum (F_max) axial loads applied to the bar. The alternating stress (σa) is half the difference between F_max and F_min.

The fatigue strength for a certain number of cycles is determined by applying the appropriate factors to the ultimate tensile strength (S_Ut) or yield strength (S_y) of the material. The fatigue strength is typically given for a specified number of cycles, such as 100, 10,000, 100,000, or 1,000,000 cycles. The fatigue strength for infinite life refers to the stress level below which the material can withstand an unlimited number of cycles without failure.

To provide accurate values for the notch sensitivity, fatigue stress concentration factors, mean and alternating stresses, and fatigue strength for the specified number of cycles, further calculations and data specific to the material properties and geometry of the bar are required.

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The amount of electric charge passing through the starter motor is 17.85 C.

Current = 21.0 A, Diameter of the wire (d) = 4.00 mm = 4.00 × 10⁻³ m, Length of the wire (l) = 1.49 m, Time taken (t) = 0.85 s

We know that the electric charge passing through the starter motor is given by,

Charge (Q) = Current × Time Taken (t)

So, we have

Charge = 21.0 A × 0.85 s

Charge = 17.85 C

Now, we need to find the resistance of the copper wire,Resistance (R) = resistivity × length / Area of cross section (A)

From the formula of the area of cross section of a circle,A = πd²/4∴

A = π × (4.00 × 10⁻³ m)²/4

A = 1.26 × 10⁻⁵ m²

We have to use the resistivity of copper, ρ = 1.72 × 10⁻⁸ Ω m

Resistance = (1.72 × 10⁻⁸ Ω m × 1.49 m) / (1.26 × 10⁻⁵ m²)

Resistance = 2.04 × 10⁻³ Ω

The amount of electric charge passing through the starter motor is 17.85 C.

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The correct answer is option 3)0 j.

Assuming that the crate is being carried at a constant velocity across the 2m room, the net work done on the crate is zero joules. This is because carrying a crate horizontally does not involve any work being done on the crate. Work is only done when a force is applied to an object and the object moves in the direction of the force. In this case, the crate is not moving vertically or horizontally, so no work is being done on it.

In other words, the force that you apply on the crate is in the horizontal direction, while the displacement of the crate is in the vertical direction. Therefore, the work done by the force is zero, and the net work done on the crate is also zero joules.

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Answer:

distance is a scalar quantity, it only has a magnitude, not direction

displacement is a vector quantity, it has both magnitude and direction

for example, 20m North -------> is a vector quantity, it shows direction

20m -----------> is a scalar quantity, it has not direction

Explanation:

a) When voltage drops by 15%, the current remains the same. ; b) If the resistance of the device were reduced by 15% the current is 4.76 A.

(a) The voltage in the first instance is 240 V. Therefore, a voltage drop of 15% means that the new voltage will be

240 V - 15% × 240 V

= 240 V - (15/100) × 240 V

= 204 V.

Since P = VI and assuming that the power (P) remains the same, then the new current is given by:

5.6 A = P/240 V ,

therefore P = 5.6 A × 240 V

= 1344 W.5.6 A

= 1344 W / 240 V,

therefore 5.6 A = 5.6 A.

When voltage drops by 15%, the current remains the same.

(b) If the resistance is reduced by 15%, it implies that the new resistance (R₁) is 85% of the initial resistance (R₀) so that R₁ = 0.85R₀.

Since P = VI and P = V²/R, the new current, I₁ is given by: P = I₁V₁= I₀V₀,

which implies that I₁ = I₀ × V₀/V₁

= I₀ × R₁/R₀.

For the initial condition, the current is given by 5.6 A.

Therefore, the new current, I₁ is given by:

I₁ = I₀ × R₁/R₀

= 5.6 A × (0.85R0 / R₀)I₁

= 4.76 A.

Therefore, the current is 4.76 A.

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A(n) "open system" interacts and has exchanges with elements in its environment.

In the context of systems and their interactions, an open system refers to a system that can exchange matter, energy, or information with its surroundings. This means that an open system can receive inputs from its environment, process them internally, and produce outputs back into the environment.

Examples of open systems in various domains include living organisms, ecosystems, industrial processes, and communication networks. These systems are characterized by their ability to interact, exchange materials or energy, and be influenced by external factors. The concept of an open system is widely used in fields such as physics, biology, ecology, and engineering to understand and analyze the behavior of complex systems that are not isolated from their surroundings.

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