2) Consider the floor beam given in Figure 4−2 below. Due to spacing issues, this beam cannot be laterally braced against lateral-torsional buckling between the supports. Therefore, it must remain in Zone 1 where L
b
​
p
​
. In this case, L
b
​
= the beam's total span length. a. First, determine the minimum ry (radius of gyration, found in Table 1-1 of AISC) required considering that L
p
​
=1.76r
y
​

F
y
​

E
​

​
, where E=29000ksi and F
y
​
=50ksi. (hint: set L
p
​
= the unbraced length of the beam, L
b
​
) b. Choose the lightest possible W-shape section, designing as if the beam is in Zone 1 and meets the minimum ry requirement from part (a). Check moment, shear, and deflection. Figure 4-2. Simply supported floor beam supporting a distributed dead load of 1k/t, distributed live load 1.2k/h, and two equal concentrated live loads of 6 kips.

The required temperature for the helium in the balloon, inflated with 0.2494g of helium to a pressure of 1.26atm, to achieve the desired volume is approximately -24.84 °C.

To find the temperature of the helium in the balloon in Celsius, we can use the Ideal Gas Law, which is represented by the formula:

PV = nRT

where P is pressure, V is volume, n is the amount of substance in moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the given mass of helium (0.2494 g) to moles using its molar mass (4.0026 g/mol):

n = (0.2494 g) / (4.0026 g/mol) = 0.0623 mol

Next, we'll use the Ideal Gas Law to find the temperature in Kelvin. We are given P = 1.26 atm, V = 1.25 L, and R = 0.0821 L atm/mol K (the ideal gas constant). So,

1.26 atm * 1.25 L = 0.0623 mol * 0.0821 L atm/mol K * T

Now we solve for T:

T = (1.26 * 1.25) / (0.0623 * 0.0821) ≈ 248.31 K

To convert this temperature to Celsius, we use the formula:

Temperature in Celsius = Temperature in Kelvin - 273.15

Temperature in Celsius = 248.31 K - 273.15 ≈ -24.84 °C

So, the required temperature for the helium in the balloon to achieve the desired volume is approximately -24.84 °C.

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In the complete description of a force vector, type is usually not necessary. Thus, the correct option is C.

A force vector is a representation which has both the magnitude and direction of the force. Such a vector is typically represented through an arrow in the direction of the force applied and with a length which is proportional to the magnitude of the force.

If a force is applied on an object, this causes movement of the object in a given direction and the wind applies a force on it at an angle, and the new motion will be as that of a force which was applied in that direction.

Therefore, the correct option is C.

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AnswerShe uses force and air

Explanation:

n bhvygvg gv

Answer:

1.875 joules

Explanation:

K.E=1/2 mv²

K.E=1/2 0.15×5²

K.E=1.875 joules

Answer:

392.4

Explanation:

40*9.81=392.4

ushi wygunu geygo sieta?

Answer: It was on between 7 and 7.30 and also between 8 and 8.30 (when the line on the graph goes up only). So it was on for an hour or 60 minutes

Answer:

13.8 billion years ago

Explanation:

It is warmer in the winter and cooler in the summer in cities because water has high specific heat and therefore changes temperature more slowly than most other substances. The correct option is C.

Climate is the average weather over a longer period of time in a particular area. A description of a climate includes details such as the typical temperature in each season, the amount of rainfall, and the amount of sunshine.

Coastal weather tends to be more moderate than continental weather, with fewer hot and cold extremes, because the ocean warms and cools more slowly than the atmosphere.

The majority of rain clouds are produced by ocean evaporation, particularly in the tropics, which affects where wet and dry regions on land are located.

Therefore, the correct option is C. Water has a high specific heat and therefore changes temperature more slowly than most other substances.

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The heat rate dissipated in one fin is approximately 13.8 W, and the total heat rate dissipated by the all-finned surface is approximately 138 W.

To calculate the heat rate dissipated in one fin, we can use the formula for heat transfer through a rectangular fin:

q = (k * A * ΔT) / L

where q is the heat rate, k is the thermal conductivity, A is the cross-sectional area, ΔT is the temperature difference, and L is the length of the fin.

Substituting the given values, we have:

q = (50 W/(m·K) * 20 cm * 1 cm * (53 ºC - 25 ºC)) / 10 cm

q = 520 W

However, since there are ten fins, we divide the heat rate by ten to obtain the heat rate dissipated in one fin:

q = 520 W / 10 = 52 W

To calculate the total heat rate dissipated by the all-finned surface, we multiply the heat rate dissipated in one fin by the total number of fins:

total heat rate = 52 W * 10 = 520 W

Therefore, the heat rate dissipated in one fin is approximately 13.8 W, and the total heat rate dissipated by the all-finned surface is approximately 138 W.

It is important to note that this calculation assumes uniform heat distribution and neglects any losses due to radiation, which are typically small in comparison to convective heat transfer in such systems.

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The effective nuclear charge (Zeff) for the 3d level of sodium is 10.3.

Zeff refers to the effective nuclear charge. In a multi-electron atom, the effective nuclear charge acting on a specific electron is not just equal to the atomic number of the element.

Because of the electron-electron repulsion, the effective nuclear charge experienced by an electron in an atom is lesser than the actual nuclear charge. Therefore, Zeff is smaller than Z, which is the atomic number.

The formula for effective nuclear charge is Zeff=Z-S, where Z is the atomic number, and S is the screening constant.

The 3p level of sodium has an energy of -3.0 eV, and the 3d level has an energy of -1.5 eV.(a) Determine Zeff for each of these states.

To determine the effective nuclear charge (Zeff), we need the electron configuration of the atom. The electron configuration of sodium (Na) is 1s²2s²2p⁶3s¹.

The 3p level of sodium has one electron, and the 3d level of sodium has no electrons because it is unoccupied. (a) Zeff for the 3p level:

For a p orbital, the screening constant is given by S = 0.35n, where n is the principal quantum number of the shell containing the orbital. For the 3p level, the value of n is 3.

Therefore:

S = 0.35 × 3 = 1.05

Zeff = Z - S = 11 - 1.05 = 9.95

The effective nuclear charge (Zeff) for the 3p level of sodium is 9.95.(b) Zeff for the 3d level:

For a d orbital, the screening constant is given by S = 0.35(n-1), where n is the principal quantum number of the shell containing the orbital.

For the 3d level, the value of n is 3.S = 0.35 × 2 = 0.7Zeff = Z - S = 11 - 0.7 = 10.3

The effective nuclear charge (Zeff) for the 3d level of sodium is 10.3.

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The ball remains in the air for approximately 3.44 seconds.

When a ball is tossed upwards with an initial velocity (v₀) of 33.8 m/s and experiences an acceleration due to gravity (g) of -9.81 m/s², we can calculate its maximum height using the formula:

\(\[ y = \frac{{v₀²}}{{2g}} \]\)

Substituting the given values:

\(\[ y = \frac{{33.8²}}{{2 \times 9.81}} = 58.09 \text{ meters} \]\)

Hence, the maximum height reached by the ball is 58.09 meters.

To determine the time the ball stays in the air, we can utilize the following equation:

\(\[ v = u + gt \]\)

Where v represents the final velocity, u is the initial velocity, g is the acceleration due to gravity, and t denotes the time taken for the ball to reach the maximum height.

In this scenario, the initial velocity (u) is 33.8 m/s, the acceleration due to gravity (g) is -9.81 m/s², and the final velocity (v) is 0 m/s. Therefore, we have:

\(\[ 0 = 33.8 + (-9.81)t \]\)

Solving for t:

\(\[ t = 3.44 \text{ seconds} \]\)

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I think because water gives pressure and if u go even deeper theres more pressure

The fact that the item is approaching you explains why the waves are closer together.

The Doppler Effect can be used to both sound and light sources. For instance, the sound waves' frequency rises when a sound object approaches you, raising their pitch. The frequency of the sound waves increases as it moves toward you, but the pitch falls as it moves away from you.

The difference in PITCH between a sound's source and listener due to motional interaction. The perceived pitch changes depending on how close or far the listener and sound source are to one another. As they draw closer, it is higher than the source's stationary pitch.

The fact that the item is approaching you explains why the waves are closer together.

Therefore, the correct answer is option 3.The waves are closer together because the object is approaching.

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The waves become closer together because the thing is coming towards you. Hence  option 3 is correct.

The Doppler Effect can be used to both sound and light sources. For instance, the sound waves' frequency rises when a sound object approaches you, raising their pitch. The frequency of the sound waves increases as it moves toward you, but the pitch falls as it moves away from you.

The difference in PITCH between a sound's source and listener due to motional interaction. The perceived pitch changes depending on how close or far the listener and sound source are to one another. As they draw closer, it is higher than the source's stationary pitch.

The fact that the item is approaching you explains why the waves are closer together.

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The electric field at the place where the charge is located is 30 N/C.

Physically, electrically charged particles are surrounded by an electric field, which acts to either attract or repel all the other charged particles in the vicinity. A system of charged particles' physical field is also mentioned.

The electric field at the place where the charge is located can be found using the formula E = F/q, where E is the electric field, F is the electrical force, and q is the charge.

In this case, the electrical force F is given as 60 N and the charge q is given as 2 C.

Plugging these values into the formula, we get:

E = 60 N / 2 C

Simplifying the equation, we get:

E = 30 N/C

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The net electric force on the blue sphere has a magnitude F and is directed in the  y direction, the sign of the charge on the yellow sphere will be negative.

Electric force is described as the repulsive or attractive interaction between any two charged bodies. Electric force just like any other  force, its impact and effects on the given body are described by Newton's laws of motion.

The distance between the two spheres, the magnitude of the charges, and the direction of the force between them would be factors that will help us determine the the sign of the charge on the yellow sphere.

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Answer:B. NET force: 2 resultant motion: left

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C. Net force: 3 Resultant motion: Left

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D. Net Force: 7 Resultant motion: right

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E. Net Force:0 resultant motion: NO MOTION

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F. NET Force: 3 resultant motion: Down

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G. NET FORCE: 10 resultant motion: up

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H. Net force: 3 Resultant motion: left

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I. Net force: 50 Resultant motion: right

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J. NET FORCE: 75 Resultant motion: down

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K. Net force :200 Resultant motion: Right

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L. Net force: 0 resultant motion:No motion

Explanation:

The test statistic (Z-score) is approximately 4.95.

To calculate the test statistic (Z-score) for this hypothesis test, we can use the formula:

Z = (sample mean - hypothesized population mean) / (standard deviation / sqrt(sample size))

Sample mean (X-bar) = 37

Hypothesized population mean (μ) = 30

Standard deviation (σ) = 8

Sample size (n) = 50

Substituting these values into the formula, we get:

Z = (37 - 30) / (8 / sqrt(50))

Z = 7 / (8 / 7.071)

Z = 7 / 1.414

Z = 4.95 (rounded to two decimal places)

A statistical hypothesis test is a technique for determining if the available data are sufficient to support a certain hypothesis. We can make probabilistic claims regarding population parameters using hypothesis testing.

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The horizontal distance travelled by the football is 3.1 m.

The angle of projection of the football is calculated as follows;

tan ( θ ) = Vy / Vx

where;

tan ( θ ) = 5 / 3

tan ( θ ) = 1.667

θ = arc tan (1.667)

θ = 59⁰

The resultant velocity of the ball is calculated as follows;

v = √ (Vx² + Vy²)

v = √ (3² + 5²)

v = 5.83 m/s

The horizontal distance travelled by the football is calculated as follows;

x = v² sin(2θ) /g

where;

x = [ (5.83)² sin(2 x 59) /9.8 ]

x = 3.1 m

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2mv is the magnitude of the impulse delivered by the wall to the ball.

What is Velocity ?

Velocity is a vector quantity that describes the rate of change of an object's position. It is equal to the displacement of an object divided by the time interval over which the displacement occurred. Velocity has both magnitude and direction, and its units are typically meters per second (m/s). The velocity of an object can change over time due to acceleration, and if an object is moving in a circular path, it also has a component of velocity perpendicular to its direction of motion, known as centripetal velocity.

Impulse = change in momentum

J = m(v - u)

  = m(v-(-v))

J = 2mv

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Answer:

Its 5 single cell batteries cannected in series

Explanation:

The specific heat of a substance is often compared to the specific heat capacity of water.

Water is commonly used as a reference substance for comparing the specific heat of other materials. The specific heat capacity of a substance refers to the amount of heat energy required to raise the temperature of a given mass of the substance by a certain amount. Water has a relatively high specific heat capacity compared to many other substances, making it a useful benchmark for comparison.

The specific heat capacity of water is approximately 4.18 joules per gram per degree Celsius (J/g°C) or 1 calorie per gram per degree Celsius (cal/g°C). This means that it takes 4.18 J (or 1 calorie) of energy to raise the temperature of 1 gram of water by 1 degree Celsius.

By comparing the specific heat of other substances to that of water, we can understand how different materials respond to heat and their ability to store or release thermal energy. Materials with a higher specific heat than water can absorb more heat energy for a given change in temperature, while those with a lower specific heat can heat up or cool down more quickly.

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Answer:

Force = Mass x Acceleration. Since the acceleration of gravity is always constant at 9.81 m/s2, the force of gravity is constant as well, according to Newton. If the object is sitting motionless on the ground, then the net force (sum of all forces) acting on it is zero

Explanation:

sorry if it doesn't help

Answer:

b. between 2 s and 4 s

Explanation:

2-4 was both 3m/s

The direction of the particle and the potential difference through which it moves from point a to point b are unknown.

If a particle initially at rest is acted on by only an electric force, it moves from point a to point b on the x-axis, increasing its kinetic energy by 8.00 x 10-19 J.In this situation, the potential difference is equal to the amount of work done by the electric field on the particle while it travels from point a to point b. Because no energy is expended in the x-direction, the work done on the particle must be equal to the increase in kinetic energy. Because the charge on the particle is q, the potential difference between point a and point b is Vb - Va.

As a result, 8.00 x 10-19 J equals the electric work done on the particle, which is equal to q (Vb - Va).q (Vb - Va) = 8.00 x 10-19 JAs a result, Vb - Va = (8.00 x 10-19 J) / q, where q is the charge on the particle. The direction of motion, as previously stated, is unknown.

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