Which element has a complete valence electron shell?


a selenium (Se)

b oxygen (O)

c fluorine (F)

d argon (Ar)



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As a joint is moved through its range of motion when strength training with free weights, such as doing the arm curl, the moment arm for the muscle crossing the joint will get :

The correct answer is a. longer.

As the joint is moved through its range of motion, the moment arm for the muscle crossing the joint will increase, resulting in a longer moment arm. This will increase the torque generated by the muscle, making the exercise more challenging and effective for building strength. This is because the moment arm length changes as the joint angle changes throughout the range of motion.

The moment arm refers to the distance between the joint axis and the line of force acting on the joint. As the joint angle changes during a lift, the moment arm for the muscle changes as well. At the beginning of the lift, the moment arm is relatively long, which allows the muscle to generate more torque.

In the case of the arm curl, as the lifter approaches the top of the curl, the moment arm for the biceps muscle gets shorter, which makes it more difficult to continue lifting the weight.

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Answer:

Climate scientists compare the tree growth records to local weather records. For locations where a good statistical match exists between tree growth and temperature or precipitation during the period of overlap, the ring widths can be used to estimate past temperature or precipitation over the lifetime of the tree.

Answer:

di ko po alam ang sagot baka

po pang grade 9 po yan

Explanation:

sana po magets nyo po

Answer:

what are the answer choices

Explanation:

i dont know the choices so i say count the stuff they recycle, and add the score to the days before.

The potential energy of the person mass 95 Kg sitting on top of a slid 3 m high is 2795.85 J

The following data were obtained from the question:

The potential energy of the person can be obtained as follow:

PE = mgh

Inputting the given parameters, we have:

= 95 × 9.81 × 3

= 2795.85 J

Thus, the  potential energy of the person is 2795.85 J

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Answer:

The correct answer is;

3450 N

Explanation:

The given parameters are;

The mass of the block = 345 kg

The location of the block = Earth

The weight, W, of an object on Earth is given by the mass of the object × The acceleration due to gravity

The acceleration due to gravity on Earth ≈ 10 m/s²

Therefore, we have;

The weight of the block on Earth = The mass of the block × The acceleration due to gravity of the block = 345 kg × 10 m/s²

∴ The weight of the block on Earth = 3450 kg·m/s² = 3450 N

A 350 kg block has a weight of 3450 N

(Therefore, a 34.5 kg block has a weight of 345 N)

This motion of the balloon is an example of buoyancy, which is the upward force exerted by a fluid on an object immersed in it.

When the balloon is neutrally buoyant, it means that the weight of the balloon and the weights attached to it is equal to the weight of the water displaced by the balloon.

If you push the balloon down to a greater depth and then release it, the balloon will rise back up to its original position.

This is because the balloon is still partially inflated and contains air, which is less dense than water. When you push the balloon down, the water pressure compresses the air in the balloon, causing it to become smaller in size.

When you release the balloon, the compressed air expands and pushes the balloon upwards towards the surface of the water.

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According to the statement the speed of the water at the point where the radius is 0.120 m is 2.88 m/s.

To calculate the speed of water at a point in the pipe where the radius is 0.120 m, we can use the continuity equation, which states that the mass flow rate is constant for an incompressible fluid flowing through a pipe. The continuity equation is expressed as A1V1 = A2V2, where A is the cross-sectional area of the pipe, and V is the velocity of the fluid. We can assume that the water is incompressible, which means that the mass flow rate is constant.
Since the water is flowing into the pipe at a steady rate of 1.60 m3/s, we can use the formula Q = AV to find the cross-sectional area of the pipe. Q represents the volumetric flow rate, which is 1.60 m3/s. A is the cross-sectional area, and V is the velocity of the fluid. Solving for A, we get A = Q/V. Substituting the given values, we get A = (1.60 m3/s) / V.
At the point where the radius is 0.120 m, the cross-sectional area of the pipe can be calculated using the formula A = πr2, where r is the radius. Substituting the given value, we get A = π(0.120 m)2 = 0.0452 m2.
Now we can use the continuity equation to find the velocity of the water at this point. A1V1 = A2V2, where A1 is the cross-sectional area at the inlet of the pipe, which is equal to the cross-sectional area of the pipe where the water is flowing at a steady rate of 1.60 m3/s. Therefore, A1 = (1.60 m3/s) / V. Substituting the values, we get A1 = 0.0452 m2.
Using the formula A1V1 = A2V2, we can solve for V2, which is the velocity of the water at the point where the radius is 0.120 m. Substituting the values, we get (0.0452 m2) V1 = (π(0.120 m)2) V2. Solving for V2, we get V2 = (0.0452 m2)(1.60 m3/s) / (π(0.120 m)2) = 2.88 m/s.

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The wavelength of the sinusoidal wave traveling along the rope is approximately 10.8 cm. To determine the wavelength, we utilize the formula wavelength = velocity / frequency.

To find the wavelength of the wave, we need to use the formula: wavelength = velocity / frequency. We are given the frequency (f) as 37.0 vibrations in 29.0 s. To find the velocity, we need to determine the distance traveled by the wave in a given time period. From the information provided, we know that a crest of the wave travels 400 cm in 12.0 s.

Frequency (f) = 37.0 vibrations / 29.0 s = 1.276 Hz

Velocity (v) = Distance / Time = 400 cm / 12.0 s = 33.33 cm/s

Wavelength (λ) = v / f = 33.33 cm/s / 1.276 Hz ≈ 26.11 cm

To find the wavelength, we first calculate the frequency using the given information that the oscillator completes 37.0 vibrations in 29.0 s. Dividing the number of vibrations by the time gives us the frequency of the wave, which is approximately 1.276 Hz.

Next, we calculate the velocity of the wave by dividing the distance traveled by the wave by the time it takes. The distance traveled by a given crest is 400 cm, and the time taken is 12.0 s. Dividing 400 cm by 12.0 s gives us a velocity of approximately 33.33 cm/s.

Finally, we can calculate the wavelength by dividing the velocity by the frequency. Dividing 33.33 cm/s by 1.276 Hz gives us a wavelength of approximately 10.8 cm.

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In a Zigbee device, the layer responsible for detecting the presence of an RF (Radio Frequency) signal in the currently selected channel is the Physical Layer (PHY).

The PHY layer in Zigbee is responsible for managing the transmission and reception of RF signals. It handles functions such as channel selection, modulation, demodulation, and signal detection. When a Zigbee device is operating in a specific channel, the PHY layer continuously monitors that channel for incoming RF signals. It performs energy detection, which involves measuring the power level of the received signal. By analyzing the received signal strength, the PHY layer can detect the presence of an RF signal in the selected channel.

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Answer:

Energy required = 3169.34 Joules.

Explanation:

The quantity of energy (Q) required can be determined by;

Q = mcΔθ

Where: m is the mass, c is the specific heat and Δθ is the change in temperature.

But, m = 96.7 kg, c = 0.874 J/(kg\(^{o} C\)), \(T_{2}\) = \(69.2^{o}\) and \(T_{1}\) = \(31.7^{o}\).

So that,

Q = mc(\(T_{2}\) - \(T_{1}\))

   = 96.7 x 0.874 x (\(69.2^{o}\) - \(31.7^{o}\))

  = 96.7 x 0.874 x 37.5

  = 3169.3425

Q = 3169.34

   = 3.2 KJ

The amount of energy required is 3169.34 Joules.

C. Positively and negatively charged objects both experience equal magnitude forces due to the electric field, but in opposite directions.

Electric fields produce a force on charged objects. According to Coulomb's law, the magnitude of the electric force is directly proportional to the magnitude of the charge on the object and inversely proportional to the square of the distance from the charge to the object.

When a charged object is placed in an electric field, it experiences a force in the direction of the electric field. If the charge on the object is positive, the force acts in the direction of the electric field. If the charge on the object is negative, the force acts against the direction of the electric field.

Therefore, both positively and negatively charged objects experience equal magnitude forces due to the electric field, but in opposite directions. The force on a positively charged object is in the direction of the electric field, while the force on a negatively charged object is against the direction of the electric field.

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The statement that only hard scientists has the essential skill set to respond in times of crisis is True.

adjective. absolutely necessary; indispensable: Discipline is essential in an army. pertaining to or constituting the essence of a thing. noting or containing an essence of a plant, drug, etc. being such by its very nature or in the highest sense natural; spontaneous: essential happiness.

meanings of essential and nature all the animals, plants, rocks, etc. in the world and all the features, forces, and processes that happen or exist independently of people, such as the weather, the sea, mountains, the production of young animals or plants,  See more at nature.

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Hi there!

We can use a summation of torques to solve.

Recall the equation for torque:
\(\large\boxed{\Sigma \tau = rF}\)

r = distance from fulcrum (balance point)

F = force (in this instance, weight, N)

We can set the fulcrum to be the balance point of 30 cm.

Thus:
Meter ruler:

Center of mass at 48 cm ⇒ 48 - 30 = 18 cm

Object:
At 6cm ⇒ 30 - 6 = 24 cm

For the ruler to be balanced:
\(\large\boxed{\Sigma \tau_{cc} = \Sigma \tau_{ccw}}\)

Thus:
\(M_Rg(18) = 60g(24)\\M_R = \frac{60(24)}{18} = \boxed{80 g}\)

The mass of the ruler is 80 grams.

If the body were moved to 13 cm:
B (balance point) - 13 = distance of object

48 - B = distance from ruler center of mass to balance point

\(80g(48 - B) = 60g(B - 13)\\\\3840 - 80B = 60B - 780\\\\4620 = 140B\\\boxed{B = 33 cm}\)

The new balance point would be 33cm from the zero end.

The wavelength of the radiation produced by a microwave oven operating at 2.10 GHz is approximately 14.3 centimeters, which is equivalent to 143 millimeters.

The wavelength of an electromagnetic wave can be calculated using the formula: wavelength = speed of light/frequency. In this case, the frequency is given as 2.10 GHz, which can be converted to hertz by multiplying by 10^9 (since 1 gigahertz = 10^9 hertz). So, the frequency becomes 2.10 × 10^9 Hz. The speed of light in a vacuum is approximately 3.00 × 10^8 meters per second. Using the formula mentioned earlier, we can calculate the wavelength as follows: wavelength = (3.00 × 10^8 m/s) / (2.10 × 10^9 Hz) Simplifying the equation, we find: wavelength ≈ 0.143 meters. To convert this to nanometers, we multiply by 10^9 since 1 meter is equal to 10^9 nanometers: wavelength ≈ 0.143 × 10^9 nanometers. These yields: wavelength ≈ 143 nanometers.

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Answer:

so, why we have to find here..

Encoding information in molecules is more higher than encoding information in bits.

Thus, for these reasons, the cost of reproducing information encoded in molecules is higher than reproducing information encoded in bits.

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The sound pressure level produced within the roof void as a result of the plant room noise is calculated to be 48 dB.

To determine the sound pressure level in the roof void, we utilize the sound reduction index of the plant room wall and the sound pressure level in the plant room. The formula used for this calculation is L2 = L1 - R, where L2 represents the sound pressure level in the roof void, L1 denotes the sound pressure level in the plant room, and R signifies the sound reduction index of the plant room wall adjoining the roof void. Given that the sound pressure level in the plant room is 61 dB and the sound reduction index of the plant room wall is 13 dB, we substitute these values into the formula to find the sound pressure level in the roof void:

L2 = 61 dB - 13 dB

L2 = 48 dB

Hence, the sound pressure level produced within the roof void as a result of the plant room noise is determined to be 48 dB. To further reduce the sound pressure level from the plant room to the adjacent rooms, there are several recommended strategies. One approach is to improve the sound insulation of the common wall between the plant room and the adjacent rooms. This can involve increasing the sound reduction index of the wall by adding sound-absorbing materials or panels, or enhancing the sealing of any gaps or openings to minimize sound leakage.

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Two conducting cylindrical wires are made out of the same material. Wire X has twice the length and twice the diameter of wire Y. The ratio of their resistances Rx/Ry is 1/2.

The resistance of a cylindrical wire depends on its length and cross-sectional area, and is given by the formula: R = (ρL) / A, where ρ is the resistivity of the material, L is the length of the wire, and A is the cross-sectional area. Since both wires are made of the same material, they have the same resistivity ρ.

Wire X has twice the length and twice the diameter of wire Y. The length of wire Y is L and its cross-sectional area is A. Therefore, the length of wire X is 2L and its cross-sectional area is 4A (since the diameter is doubled, the area is quadrupled).
Using the formula for resistance, the ratio of the resistances of the two wires is:

Rx/Ry = [(ρ x 2L) / (4A)] / [(ρ x L) / A] = 1/2

Therefore, the answer is A) 1/2.

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If a pitcher wants to throw two balls requiring the same amount of work to throw, the ball without spin (Ball B) will travel faster toward home plate.

(a) Ball A, which is spinning rapidly, has more total mechanical energy because rotational kinetic energy is added to its translational kinetic energy. The spin contributes to the overall energy of the ball.

(b) Ball A, which is spinning rapidly, requires more work to throw because the rotational motion adds an additional component of kinetic energy that needs to be provided by the pitcher.

(c) If a pitcher wants to throw two balls requiring the same amount of work to throw, the ball without spin (Ball B) will travel faster toward home plate. This is because the absence of spin allows for better aerodynamic efficiency, reducing air resistance and allowing the ball to maintain higher translational speed.

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Answer:

If I read this correctly the main scale reads 49 mm = 4.9 cm

The vernier divides each mm into 10 parts and the vernier indicates that the final reading is 8/10 ths between 49 mm and 50 mm

Thus the final reading is 49.8 mm = 4.98 cm

Answer:

1) To find the volume of the wood block, divide the mass by the density:

Volume = 583.3 g / 2.7 g/cm³

Volume = 216.24 cm³

2) To find the density of the butter, divide the mass by the volume:

Density = 319 g / 350 cm³

Density = 0.9114 g/cm³

Explanation:

In the Bohr model of the hydrogen atom, the energy levels are given by the formula E = -13.6 eV / n^2, where n is the principal quantum number. The largest possible angular momentum for a hydrogen atom with an energy 12.09 eV above its ground state is 4h/2π, where h is Planck's constant.

In the Bohr model of the hydrogen atom, the energy levels are given by the formula E = -13.6 eV / n^2, where n is the principal quantum number. The ground state corresponds to n = 1, with an energy of -13.6 eV. If an atom has an energy of 12.09 eV above its ground state, we can find the corresponding value of n by equating the energy equation with the given energy:

-13.6 eV / n^2 = 12.09 eV

Solving this equation, we find n ≈ 2. Thus, the hydrogen atom is in the n = 2 energy level. The angular momentum of an electron in the hydrogen atom is quantized and given by the formula L = nh/2π, where L is the angular momentum and h is Planck's constant. The largest possible angular momentum for the given energy level (n = 2) is when n = 2. Therefore, the largest angular momentum is 2h/2π, which simplifies to h/π or 2h/2π. Thus, the largest angular momentum that the hydrogen atom could have is 2h/2π, where h is Planck's constant.

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Answer:

yes I think

Explanation:

because lamp is connected to eac other

Answer:

Av = 12.9 [km/h]

Explanation:

We must remember that the average speed is defined as the relationship between the space traveled over a certain time.

\(Av = x/t\)

where:

Av = average speed [km/h]

x = distance [km]

t = time [hr]

For when he was on the bus

The distance can be calculated by clearing the equation, for the term of the distance

\(x_{1}= A_{v}*t\\x_{1}= 15*1.6\\x_{1}=24[km]\)

For when Andy was walking

\(x_{2}=A_{v}*t\\x_{2}=4.5*0.4\\x_{2}=1.8 [km]\)

Now the total time is the sum of 1.6 + 0.4 = 2 [hr], and the total distance is the sum of the distances calculated above.

\(x = 24 + 1.8\\x = 25.8 [km]\)

The average speed is calculated using the ratio of space to time.

\(Av = 25.8/2\\Av = 12.9 [km/h]\)

Answer:

I would say D. All terrestrial planets are made up of rock and minerals and the other planets are made up of that do not have a solid surface.

Answer D.

Explanation:

While many stars can produce elements such as gold, neutron stars are the most likely to have created the atoms found in our jewelry and electronics through their unique properties and ability to undergo r-process nucleosynthesis.

The most likely star to have made the atoms of gold in your jewelry or electronics is a neutron star. Neutron stars are the densest objects in the universe, formed when a massive star collapses in a supernova explosion. During this process, the core of the star is compressed to such a high density that protons and electrons merge, forming neutrons.

Neutron stars also have extremely strong gravitational and magnetic fields, which can create the conditions necessary for the production of heavy elements such as gold through a process called r-process nucleosynthesis. In this process, neutrons are rapidly captured by atomic nuclei, leading to the creation of heavier elements.

When a neutron star collides with another neutron star or a black hole, it can produce an intense burst of energy and radiation that can be detected by telescopes on Earth. In 2017, such a collision was observed by the Laser Interferometer Gravitational-Wave Observatory (LIGO), providing direct evidence for the formation of heavy elements in neutron star mergers.

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Object distance, u = 26.0 cm

Focal length, f = -14.0 cm

Image distance, v = ?

The relationship between object distance, image distance, and focal length is:

Magnigication is calculated as:

The magnification of the object = 0.35

True, an applied force to one mass can distribute a force impact to other forces. When a force is applied to an object, it can cause the object to accelerate, change its shape, or transfer the force to other objects in contact with it.

This phenomenon is based on Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. When a force is applied to one mass, it creates an action force. As a result, the mass reacts with an equal and opposite reaction force. This reaction force can then be transferred to other masses or objects that are in contact with the first mass. The force distribution can occur through direct contact or through connected systems, like ropes, pulleys, or springs.


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