How many dots belong in the electron dot diagram of a boron (B) atom?

three
five
eight
thirteen
BTW ITS SCEINCE

The distance for the first image is 22 ft for the second image is 44 ft, and for the third image is 66 ft.

The distance from the person to the first three images in the left-hand mirror can be found by using the equation of the image distance in a mirror:

Image distance = 2 x Object distance.

The object distance is 11.0 ft for the left-hand mirror and 4.00 ft for the right-hand mirror.

Therefore, the distance to the first image in the left-hand mirror is,

22 ft (11.0 ft x 2 = 22 ft),

the second image is,

44 ft (11.0 ft x 2 + 4.00 ft x 2 = 44 ft),

The third image is,

66 ft (11.0 ft x 2 + 4.00 ft x  2 + 4.00 ft x 2 = 66 ft).

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Answer:

3.2 hours

Explanation:

96÷30=3.2

so it should take 3.2 hours

Answer:

27.9617 mi/h

Explanation:

Speed= distance/time

S= 15000/1200

A ball when is projected horizontally from the top of a vertical cliff 40m high with a velocity of 20m/s, the vertical component of the velocity on getting to the ground​ is 28.3 m/s.

When any object moves, it can be said to be in motion under gravity because gravity has an impact on the object’s vertical motion. Gravity is also called as the force that pulls things downward. In actuality, gravity pulls objects toward the Earth’s center.

The particle’s initial velocity is 0 during free fall. Consequently, this v=gt is the equation of motion.

An object launched into the air may also experience a shift in upward velocity due to gravity, which causes it to slow down and return to Earth’s surface. The Moon is kept in orbit by the force of Earth’s gravity, which also causes the Moon to rotate constantly.

Initial horizontal velocity = 20\(ms^{-1}\)

Initial vertical velocity = 0

Vy= Uy + gt

Vy= gt {Uy= 0}

Vy= 10 × 2.83= 28.3m/s

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Answer:

measure what

Explanation:

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Answer:

B. Mass

Explanation:

An image recorded with a CCD (charge-coupled device) is better for astronomers than an image recorded on photographic film or plates. This is because: CCDs have a higher sensitivity

CCDs are more reliable, can capture a wider range of wavelengths, and are easier to work with. The following are the reasons why CCDs are better than photographic film or plates:

Sensitivity: CCDs are more sensitive to light than photographic film or plates. This means they can capture more light in a shorter amount of time, allowing astronomers to take images faster and with greater precision.

Reliability: CCDs are more reliable than photographic film or plates. They are not affected by temperature changes or chemical deterioration, which means they can last longer and produce more consistent results over time.

Wavelength range: CCDs can capture a wider range of wavelengths than photographic film or plates. This means they can be used to observe different types of objects, such as galaxies and quasars, that emit light at different wavelengths.

Ease of use: CCDs are easier to work with than photographic film or plates. They are smaller, lighter, and can be used with digital cameras, making it easier to store and share images.

Overall, CCDs are better for astronomers than photographic film or plates because they are more sensitive, reliable, can capture a wider range of wavelengths, and are easier to work with.

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The function of sleep theory supported by the illustration is sleep conserves and protects.

From the first sentence, bats sleep a lot because they face little danger from predators and as such, they have a high-calorie diet of insects.

From the second sentence, cows sleep less, because they face more danger from predators and as such, they have a low-calorie diet of insects.

We can conclude that sleep helps to keep animal safe. Therefore, the correct option will be, "Sleep conserves and protects".

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Answer:

mass 3.67 kg, density 600 kg/m3) is fitted

with lead (density 1.14 * 10^4 kg/m3) so that it floats in water with

0.900 of its volume submerged. Find the lead mass if the lead is fitted

to the block’s (a) top and (b) bottom.

Answer:

hydrochlorine +12÷B to the power of 4 -× y reapeated zminus 2 to the power of 9

Advanced LIGO (Laser Interferometer Gravitational-Wave Observatory), Advanced Virgo, and KAGRA (Kamioka Gravitational Wave Detector) are three state-of-the-art ground-based gravitational-wave detectors. These detectors are designed to observe and localize gravitational-wave transients, which are sudden bursts of gravitational waves resulting from cataclysmic astrophysical events.

The prospects for observing and localizing gravitational-wave transients have significantly improved with the upgrades made to these detectors.

Advanced LIGO, Advanced Virgo, and KAGRA have undergone substantial upgrades to enhance their sensitivity to gravitational waves. These improvements allow them to detect weaker signals and observe events at larger distances in the universe.

These detectors form a global network, enabling the joint observation and analysis of gravitational-wave signals. By combining the data from multiple detectors, scientists can precisely determine the direction and properties of the detected sources. The more detectors in the network, the better the localization of the transient events.

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The complete question will be:

What types of events have scientists so far been able to detect with gravitational wave observatories, such as LIGO prospects for observing and localizing gravitational-wave transients with advanced ligo, advanced virgo and kagra

Answer:

You've probably noticed that static electricity is more noticeable during the winter months. This is because the air is very dry. In the summer, the humidity and moisture in the air help electrons move more quickly, which makes it harder to build up a big static charge.

Explanation:

Kinetic energy is energy of motion. If the object is sitting still, then it has no kinetic energy. It doesn't matter what its mass is, or how high the shelf is.

KE = 0

Answer:

The current through all of the resistors will add up to 10 A.

Explanation:

The values of the density, volume and masses are:

Density is defined as the ratio of mass and volume of  a substance.

The given data is as follows:

Mass of empty density bottle = 43.2 g

Mass of density bottle full of water = 66.4 g

Mass of density bottle with some sand = 67.5 g

Mass of density bottle with the sand

filled up with water = 82.3 g:

(a) mass of water that completely filled the bottle = 66.4 - 43.2

mass of water that completely filled the bottle = 23.2 g

(b) volume of water that completely filled the bottle = mass/density

density of water = 1 g/cm³

volume of water that completely filled the bottle = 23.3 g/1 g/cm³

volume of water that completely filled the bottle = 23.2 cm³

(c) volume of the density bottle = 23.2 cm³

(d) mass of sand = 67.5 g - 43.2 g = 24.4 g

(e) mass of water that filled the space above the sand = 82.3 - 67.5 = 14.8 g

(f) volume of sand = volume of bottle - volume of water

volume of water = 14.8 cm³

volume of sand = 23.2 cm³ - 14.8 cm³

volume of sand = 8.4 cm³

(g) density of sand = 24.4 g/8.4 cm³ = 2.9 g/cm³

Therefore, the density of sand is obtained by taking the ratio of the mass of the sand and the volume if the sand.

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a) To find the velocity at a time t, we need to integrate the acceleration function with respect to time. Using the given acceleration function a(t) = 2t + 3, we integrate it to obtain the velocity function v(t):

v(t) = ∫(2t + 3) dt

v(t) = t^2 + 3t + C

To find the constant of integration (C), we use the initial velocity v(0) = -4:

-4 = (0)^2 + 3(0) + C

C = -4

Therefore, the velocity at time t is given by:

v(t) = t^2 + 3t - 4

b) To find the distance traveled over the time interval 0 ≤ t ≤ 3, we need to integrate the velocity function v(t) with respect to time and evaluate it within the given time interval. The distance traveled (d) is given by:

d = ∫[0,3] (t^2 + 3t - 4) dt

Evaluating the integral within the limits:

d = [(1/3)t^3 + (3/2)t^2 - 4t] [0,3]

d = [(1/3)(3)^3 + (3/2)(3)^2 - 4(3)] - [(1/3)(0)^3 + (3/2)(0)^2 - 4(0)]

d = 9 + 13.5 - 12 - 0

d = 10.5

Therefore, the particle traveled a distance of 10.5 units over the time interval 0 ≤ t ≤ 3.

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Answer:

Explanation:

We shall represent the point of destination and point of new starting point in vector form .

i and j will represent east and north .

point of destination = 123 j

starting point = 112 i

distance between the two

D = 123 j - 112 i

magnitude of D = √ ( 123² + 112² )

= 166.35 km

Direction of D

Tanθ = -  123 / 112

= - 1.09

θ = 132.54 degree from east in positive angle .

The dispersion relation of a simple cubic tight-binding band is given by E(k) = E_0 - 2t(cos(k_xa) + cos(k_ya) + cos(k_za)).

The dispersion relation of a simple cubic tight-binding band is given by E(k) = E_0 - 2t(cos(k_xa) + cos(k_ya) + cos(k_za)), where E_0 is the on-site energy and t is the hopping parameter.

To calculate the effective mass tensor (Mij), we need to determine the second derivative of the energy with respect to the wavevector (k). For each point in the Brillouin zone, we differentiate the dispersion relation twice with respect to each component of k, resulting in a 3x3 tensor.

At the center of the Brillouin zone (k = (0,0,0) = T), the effective mass tensor is diagonal with all elements equal to m_0 = 1/(2t*a^2).

At the face center (k = (0,1,1) = X), the effective mass tensor has m_xx = m_yy = m_0 and m_zz = m_0/2. At the corner (k = (1,1,1) = L), the tensor has m_xx = m_yy = m_zz = m_0/2.

The effective mass concept provides information about the curvature of the energy bands near specific points in the Brillouin zone. It is useful for characterizing charge transport properties, such as electron mobility, as it relates to the response of electrons to an external electric field.

At the face center (k = (0,1,1)), the effective mass tensor indicates anisotropy in the electron mobility, as the m_zz component is smaller than m_xx and m_yy.

This anisotropy implies that electrons exhibit different mobilities along different crystallographic directions, which can have implications for device design and material engineering in specific applications.

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Answer:

Ask with your Science teacher

Explanation:

i do not know the ans

Answer:

The electrical energy consumed in boiling the water is 0.0788 kWh

Explanation:

Given;

mass of the water, m = 600 g = 0.6 kg

power rating of the kettle, P = 1500 W = 1.5 kW

specific heat capacity of water, c = 4,200 J/kg⁰C

density of water, = 1000 kg/m³

time taken to boil the water, t = 3 mins + 9 s = (3 x 60s) + 9 s = 180 s + 9 s = 189 s = \(189 \ s \times \frac{1 hr}{3.600 \ s} = 0.0525 \ hr\)

The electrical energy consumed in boiling the water is calculated as;

E = P x t

E = 1.5 kW  x 0.0525 hr

E = 0.0788 kWh

Therefore, the electrical energy consumed in boiling the water is 0.0788 kWh

Answer:

do what your.heart tells you to answer.

Amphibians retain a set of gills their whole lives that help them to breathe in the water. So, the correct option is D.

Amphibians are defined as the class of cold-blooded vertebrates which is made up of frogs, toads, salamanders, newts, and caecilians. All amphibians that spend part of their lives in water and part of their lives on land.

Amphibians are born with gills, and some outgrow them when they become adults while others retain them for their entire lives.

Thus, the correct option is D.

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Answer:

don't know sorry for the irreverent answer..

Answer:

The index of refraction varies with frequency, it doesn't change as light travels from one medium to another, As violet colour has the shortest wavelength and so the refractive index is maximum for it.

If a vertical pendulum is hung from an elevator that is accelerating upwards, the period of the pendulum will increase.

This is because the acceleration of the elevator will also affect the pendulum, causing it to experience a force that pushes it in the same direction as the elevator's acceleration.

As a result, the effective length of the pendulum will increase, causing its period to lengthen. This phenomenon is known as the "equivalence principle," which states that the effects of gravity and acceleration are indistinguishable.
If a vertical pendulum is hanging from an elevator that is accelerating upwards, the period of the pendulum will increase.

This occurs because the effective gravitational force acting on the pendulum becomes greater due to the acceleration, causing the pendulum to take more time to complete one oscillation.

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Beta radiations consist of positrons or electrons. These radiations have higher energy than alpha particles but lower energy than gamma particles. A piece of paper will not be enough to stop a beta particle. It can be stopped by a few inches of glass or thin aluminum sheets.

Thus the beta radiation requires glass to be stopped.

Answer:

Both technicians are correct.

Explanation:

Exhaust gas recirculation (EGR) contributes to limit the production of polluted gas mixture during internal engine combustion via an EGR valve. With the help of Exhaust gas recirculation (EGR), nitrogen oxides production is reduced drastically especially when the engine runs on diesel. Black smoke, engines making knocking sounds could be a clear indication of a bad EGR valve especially when the valve passage is blocked due to carbon deposits, or dirt from fuel blocking the valve opening thereby decreasing the power output, or in the case of the knock sounds, the fuel gets ignited early when the machine's operation at a given time is low. So, the Technicians are correct with the statements they made.

Answer:

The weight of the wrench on the Moon is approximately 0.8555 N

Explanation:

On Earth, the acceleration of gravity at sea level is 9.8 m/s^2

then if the wrench weights 5.24 N that means that its mass according to Newton's second law is:

\(F = m \, a\\m=\frac{F}{a} \\m=\frac{5.24}{9.8} \, kg\\m=0.5347\)

Now we can use the wrench's mass to find its weight on the Moon, knowing that the acceleration due to gravity there is 1.6 m/s^2:

\(W=m\,g\\W=(0.5347) \,(1.6) \,N\\W=0.8555\,\,N\)

Answer:

Explanation:

0.8555

Voltage measures the electric potential difference between two points in an electric circuit. It is often referred to as electric potential and is measured in volts (V).

The voltage of a battery is an indication of the amount of electrical energy that the battery can provide to a circuit. The output voltage of a battery can be calculated using the formula: V = E/Q; where V is the output voltage, E is the energy expended, and Q is the amount of charge moved. Plugging in the values given in the question, we get:

V = 3 J / 0.4 C

V = 7.5 V

Therefore, the battery's output voltage is 7.5 volts when 3 joules of energy are expended in moving 0.4 coulombs of charge. Rounded to one decimal place, the answer is 7.5 volts.

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