two small nonconducting spheres have a total charge of q=q1 q2=q=q1 q2= 95.0 μcμc , q1

Answer:

Oxygen, Argon, Carbon

edge2020

Answer:

carbon, oxygen, argon,

Explanation:

:)

1 ft²= 0.09290304m²

so:

43560ft²= 0.09290304m²×43560

= 4,046.8564224 m²

Answer: 4046.9m² (approx.)

Explanation:

An acre is 43560 ft², but the US has two feet, the International foot, and the (old) Survey foot. Since 1983, the answer varies by state according to which foot the State has adopted for surveying. (Previously, it was always the Survey foot).

International: 43560 ft² x (0.3048 m/ft)² = 4046.856 422 m²

Survey: 43560 ft² x (1200/3937 m)² = 4046.872 610 m²

Both round to 4046.9 m² if that’s good enough, but there is a tiny difference.

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245-degree days are accumulated in a seven-day period when the average outside temperature is 30 oF.

To calculate degree days, we need to find the difference between the average outside temperature and the base temperature (usually 65 oF) for each day, and then add up those differences for the period in question.
In this case, let's assume the base temperature is 65 oF. So, for each day, we need to find the difference between 30 oF and 65 oF, which is 35 oF. Then, we add up those differences for the seven-day period:
35 + 35 + 35 + 35 + 35 + 35 + 35 = 245
Therefore, the answer is A) 245.

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245-degree days are accumulated in a seven-day period when the average outside temperature is 30 oF.

To calculate degree days, we first need to determine the base temperature, which is the temperature below which a building needs to be heated.

This value varies depending on the location and building type. For example, a common base temperature for residential buildings in the United States is 65°F.

The degree days for a given day is calculated by subtracting the base temperature from the average temperature for that day.

If the average temperature is below the base temperature, the degree days for that day are considered zero.

For the given problem, the average outside temperature is 30°F. Assuming a base temperature of 65°F, we can calculate the degree days for each of the seven days:

Day 1: 65 - 30 = 35 degree days

Day 2: 65 - 30 = 35 degree days

Day 3: 65 - 30 = 35 degree days

Day 4: 65 - 30 = 35 degree days

Day 5: 65 - 30 = 35 degree days

Day 6: 65 - 30 = 35 degree days

Day 7: 65 - 30 = 35 degree days

To find the total degree days for the seven-day period, we add the degree days for each day:

35 + 35 + 35 + 35 + 35 + 35 + 35 = 245 degree days

Therefore, the answer is A) 245.

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A wire has a length of l1 and a cross-sectional surface area of a1 and if we double the length of this wire, and reduce its surface area to 1/3 of its original value. The resistance change by: 6 times

The resistance change can be calculated using the formula R = ρl / a, where ρ is the resistivity of the wire, l is the length of the wire, and a is the cross-sectional area of the wire. If we double the length of the wire and reduce its surface area to 1/3 of its original value, we can find the new resistance using the same formula. Let's call the new length of the wire l2 and the new cross-sectional area a2.

So, we have:
l2 = 2l1  (double the length)
a2 = (1/3)a1  (reduce the surface area to 1/3 its original value)

Now we can calculate the new resistance:
\(R2 = ρl2 / a2\)
\(R2 = ρ(2l1) / [(1/3)a1]\)
\(R2 = 6ρl1 / a1\)

So the new resistance is 6 times the original resistance. This means that the resistance changes by a factor of 6 when the length of the wire is doubled and the surface area is reduced to 1/3 of its original value.

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The potential energy of a 3 kg ball that is on the ground is zero.

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Answer:

C: it ignores parts of the method within an investigation

With 30,000ml of air left in a used tank, taking in full inspiratory reserve volume with panic breaths, one can inhale around 20 times before the air runs out.

You can breathe normally 20 times until the air runs out after diving into the water, discovering a used air tank with 30,000 ml of air left, and panicking while inhaling the entire inspiratory reserve volume with each breath. The quantity of air that can be breathed more than the tidal volume is known as the inspiratory reserve volume. An adult in good health has an average inspiratory reserve capacity of about 3,000 ml.

As a result, you may take about 10 complete breaths with 30,000 ml of air still in the tank, multiplied by 3,000 ml for every breath. The inspiratory reserve capacity is expected to rise during panic breathing, leading to smaller breaths and more frequent inhalations, allowing for about 20 breaths. In a survival crisis, it's critical to maintain composure and save air.

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A compass needle always points north due to Earth's magnetic field.

The Earth acts as a giant magnet with a magnetic north and south pole. The compass needle is a small magnet that aligns itself with the Earth's magnetic field.

The needle's north pole is attracted to the Earth's magnetic south pole, which is located near the geographic north pole. This alignment causes the needle to point in a northerly direction.

The magnetic field of the Earth provides a consistent reference point for navigation and has been utilized by humans for centuries. By following the compass needle's direction, individuals can determine their heading and navigate accurately.

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Answer:

Speedometer. It's in the name.

Answer:atom one and atom four

Explanation:

Using a saltwater aquarium to model the ocean has limitations, such as showing only a small part of the actual ocean and being unable to replicate the vastness and complexity of the ocean ecosystem.

One limitation of using a saltwater aquarium to model the ocean is that it can only show a small part of the actual ocean. Since an aquarium is confined and limited in size, it cannot realistically replicate the vastness and complexity of the ocean ecosystem. For example, it may not have the space to accommodate large marine animals like whales or the turbulent currents that exist in the open ocean. Therefore, it is important to recognize that while a saltwater aquarium can provide some insights into the ocean, it cannot fully capture the dynamic nature and diverse interactions found within the entire ocean ecosystem.

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Answer:

potential energy

Explanation:

The given statement "Formula for conservation of internal kinetic energy (works for elastic collisions) is: ΣKEi=ΣKEf (use 1/2mv² for each object in the system)" is TRUE because the initial kinetic energy of the system is equal to the final kinetic energy of the system.

The formula for conservation of internal kinetic energy states that the initial kinetic energy of a system is equal to the final kinetic energy of the same system in an elastic collision.

This formula can be expressed as ΣKEi=ΣKEf, where ΣKEi is the sum of the initial kinetic energy of all objects in the system, and ΣKEf is the sum of the final kinetic energy of all objects in the system.

In this formula, the mass and velocity of each object in the system are taken into account using the formula 1/2mv² for kinetic energy.

It is important to note that this formula only works for elastic collisions, where there is no loss of kinetic energy due to friction or other forces.

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The minimum size of branch circuit conductors of an AC non-motor generator arc welder on an individual circuit with a nameplate primary current of 100A and a duty cycle of 70% with THHN copper wires is 3 AWG.

What is an AC non-motor generator arc welder?

How do we calculate the minimum size of conductors for a welder?

For example, for the given nameplate primary current of 100A and duty cycle of 70%, the calculation would be:

100A x 70% = 70A

70A / 0.8 = 87.5A

The minimum conductor size required is 3 AWG copper THHN wires.

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The minimum size of the branch circuit conductors for the AC non motor-generator arc welder with a primary current of 100A and a duty cycle of 70% is 4 AWG THHN copper.

The minimum size of the branch circuit conductors for an AC non motor-generator arc welder with a nameplate primary current of 100A and a duty cycle of 70% can be determined by using the ampacity rating for the primary current. Since the duty cycle is given as 70%, we multiply the primary current by this duty cycle to find the effective current. Therefore, the effective current is 100A * 0.70 = 70A.

To find the minimum size of the branch circuit conductors, we can refer to the American Wire Gauge (AWG) standard, which is commonly used for determining wire sizes. The effective current of 70A falls within the range of common wire sizes. In general, a 70A current can be safely carried by 4 AWG THHN copper conductors. Therefore, the minimum size of the branch circuit conductors should be 4 AWG THHN copper.

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Answer:

An article written by a scientist .

Explanation:

Primary sources information are those that contain first  hand information probably from the place of the activities or by the original contact of the information (source ) .

So primary information is normally contained in artifact , journals , letter , dissertations manuscripts  , videos and audio recordings .

The fact that the article is written by the scientist means he is the one who has the original information hence he is the first person to access the information , meaning he is the original owner .

Answer:

During the evening, the land cools off more quickly than the water. The cooler land cools the air above it, while the warmer water warms the air above it. These differences in air temperature create the convection.

Explanation:

sorry I took forever

Answer:

2.2 s

Explanation:

His vertical initial velocity  u =0

vertical displacement h = 24 m .

vertical acceleration g = 9.8 m /s²

h = ut + 1/2 gt²

24 = 1/2 x 9.8 x t²

t = 2.2 s .

Time of fall = 2.2 s

Answer:

A force is a push or a pull.

Explanation:

Example: A boy is pushing a box. He has to push the box to go forward or pull it to go backwards.

Hope this helped

Answer:

c

Explanation:

diluted means weakened

Another term for weak solutions is dilute solution. Thus, the correct option for this question is C.

A weak solution may be defined as a type of solution that significantly partially dissociates into its ions in an aqueous solution or water. In contrast, a strong solution fully dissociates into its ions in water.

The concentration of the weak solution is found to be lower as compared to the strong solution. The word dilute also symbolizes the presence of less concentration in any solution.  

The main difference between weak and strong solutions is true that for strong solutions we are given a Brownian motion on a given probability space whereas for weak solutions we are free to choose the Brownian motion and the probability space.

Therefore, another term for weak solutions is dilute solution. Thus, the correct option for this question is C.

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The frequency ()of photons to break the O-H bond is 1.1704 ✕ 1015 Hz.

Here, it is given that

The bond energy of O-H per mole=E =467 kJ/mol

Convert the unit of bond energy from kJ to J by using a conversion factor:

1kJ =1000 J

467 kJ/mol = 467 ✕ 103 J /mol

Determine the bond energy for 1 molecule of water (H2O) as:

E = Bond energy per mole / Avogadro’s number (NA)

E = (467 ✕ 103 ) / (6.022 ✕ 1023 )

=  77.55 ✕ 10-20 J

Thereby, the energy required to break 1 molecule of H2O is 77.55 ✕ 10-20 J

Now, determine the frequency in Hz by using a relation:

E=h

Where ‘’ is the frequency of the photon and ‘h’ is the Planck’s constant whose value is 6.626  ✕ 10-34 J/s.

Putting all the values we get,

(77.55 ✕ 10-20 J) = (6.626  ✕ 10-34 J/s) ✕

= (77.55 ✕ 10-20 J) / (6.626  ✕ 10-34 J/s)

= 11.704  ✕ 1014 s-1

= 1.1704 ✕ 1015 s-1

So,  =1.1704 ✕ 1015 Hz

Therefore, the frequency ()of photons to break the O-H bond is 1.1704 ✕ 1015 Hz.

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Answer:

sorry

Explanation:

To calculate the current, we need to find the number of helium nuclei passing through a given point per unit time. The linear density of helium nuclei (denoted by λ) is given as 9.53 × 10^7 m^(-1), which represents the number of nuclei per meter.

Since the helium nuclei are accelerated to a speed of 2.09 × 10^6 m/s, each nucleus takes a time of Δt = 1/v to pass through a given point. Therefore, the number of nuclei passing through that point per unit time is λv.

The charge of each helium nucleus is 2e, where e is the elementary charge. Thus, the total charge passing through the point per unit time is given by Q = 2e × λv.

Finally, the current (I) is defined as the rate of flow of charge, so we can write I = Q/Δt = 2e × λv / (1/v) = 2eλv^2.

Plugging in the given values, we get I = 2 × (1.6 × 10^(-19) C) × (9.53 × 10^7 m^(-1)) × (2.09 × 10^6 m/s)^2 ≈ 4.00 A.

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Answer:

Nice

Explanation:

\(\star\sf \overrightarrow{A}=4N\)

\(\star\sf\overrightarrow{B}=6N\)

\(\boxed{\sf R=\sqrt{A^2+B^2+2ABcos\theta}}\)

\(\\ \sf\longmapsto R=\sqrt{4^2+6^2+2(4)(6)cos160}\)

\(\\ \sf\longmapsto R=\sqrt{16+36+48(-0.93)}\)

\(\\ \sf\longmapsto R=\sqrt{52-44.6}\)

\(\\ \sf\longmapsto R=\sqrt{7.4}\)

\(\\ \sf\longmapsto R=2.7N\)

Answer:

See explanation

Explanation:

It is a common observation that when water drops on a clean glass surface, it appears as little bags of water.

Surface tension makes water surface act like a stretched elastic skin bag.

Surface tension is caused by attractive forces between the molecules at the surface and the molecules in the bulk of a liquid. Remember that the forces of cohesion between water molecules are very strong.

When surfactants such as soap are added to water, the surface tension of water is decreased, hence the experiment.

The main difference between the Bohr model and the electron cloud model is explained as, in Bohr's model, orbital paths around the nucleus are treated as discrete electron energy levels but the electron cloud model is a group of electrons circulating around a nucleus or a molecule. Usually refers to the valence electrons.

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Answer:

d = 4.425 x 10⁻⁶ m = 4.425 μm

Explanation:

The charge on plates can be given as:

\(q = \sigma A=CV\\where,\\\\C = Capacitance\ of\ parallel\ plate\ capacitor = \frac{\epsilon_oA}{d}\\\\therefore,\\\\\sigma A=(\frac{\epsilon_oA}{d})V\\\\d = (\frac{\epsilon_o}{\sigma})V\)

where,

d = spacing between plates = ?

ε₀ = Permitivity of free space  = 8.85 x 10⁻¹² C²/Nm²

σ = surface charge density = (30 nC/cm²)(10⁻⁹ C/1 nC)(1 cm²/10⁻⁴ m²)

σ = 3 x 10⁻⁴ C/m²

V = Potential Difference = 150 V

Therefore,

\(d = \frac{(8.85\ x\ 10^{-12}\ C^2/Nm^2)}{3\ x\ 10^{-4}\ C/m^2}(150\ V)\\\)

d = 4.425 x 10⁻⁶ m = 4.425 μm

Answer:

wdym

Explanation:

Answer:

D. Sulfur hexafluoride.

Explanation: