PLS HELP ME
Secondary waves CANNOT travel through
a.
rock.
b.
liquids.
c.
Earth’s mantle.
d.
Earth’s crust.

Answer:

everyone else does this to me so lol

Explanation:

Answer:

1. 9 m/s/s

2. 33 m/s

3. 5 m/s/s

4. 9.6 m/s

Explanation:

We will have that the factor that determines the direction of the heat flow between objects is the difference in temperature.

Answer:

12.3°C should be the correct answer

Answer:

12.3

Explanation:

Answer:

Rae Young at Bell Labs. They diagrammed a network of wireless towers into what they called a cellular layout. Cellular was the chosen term because each tower and its coverage map looked like a biological cell. Eventually, phones that operated on this type of wireless network were called cellular phones.

Explanation:

The type of energy used by the muscles of larvae and pupae to dive down through water is chemical potential energy from their cells. When the muscles contract, the chemical energy stored in the cells is converted into mechanical work, which allows the larvae and pupae to move through the water. Since Larvae and pupae have muscles that allow them to move through the water. When these muscles contract, they convert the stored chemical energy in their cells into mechanical work, which allows the larvae and pupae to move through the water. This is an example of how chemical potential energy can be converted into kinetic energy, which is the energy of motion. Therefore, the type of energy used by the muscles of larvae and pupae to dive down through water is chemical potential energy from their cells.

I can try and help whats it about?

In the context of forecasting, the term bias refers to the tendency of forecasts to consistently be larger or smaller than the actual values of the time series.

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Answer H2SO4 + B(OH)3  B2(SO4)3 + H2O

Explanation:

just trust me here if it isnt right just tell me

Answer:

H2SO4 + B(OH)3  B2(SO4)3 + H2O

Explanation:

This will help a lot you guys trust me

Answer:

t = 1.659s

Explanation:

We can use the kinematics equations to solve this questions:

v = u + at

\(v^{2} = u^{2} +2as\)

where v = Final Velocity, u = initial velocity, a = acceleration, t = time, s = displacement

a) Given information from the question,

u = \(\frac{70km}{h} =\frac{(70*1000)m}{(1*3600)s} = 19.444m/s\) (Convert km/h to m/s first)

a = \(2m/s^{2}\)

s = 35m

Now we can substitute these values into the 2nd kinematics equation to find v, final velocity.

\(v^{2} =(19.444)^{2} +2(2)(35)\\v=\sqrt{(19.444)^{2} +2(2)(35)} \\v= 22.761m/s (5.sf)\\\)

b) Now we have the final velocity, we can substitute the values into the first kinematics equation to find t , the time taken.

v = u + at

22.761 = 19.444 + 2t

2t = 22.761 - 19.444

t =\(\frac{22.761-19.444}{2}\)

t = 1.659s

#1

W and Y

Y has 6electrons-->2electrons to complete octet.

W has 2electrons-->6electrons to complete octet.

#2

Z and V

V needs 7electrons to complete octet.

Z needs 1 electron to complete octet.

W and Y, Y has 6electrons-->2electrons to complete octet. W has 2 electrons --> 6 electrons to complete the octet. Z and V, V needs 7 electrons to complete the octet. Z needs 1 electron to complete the octet.

A covalent bond is formed when two atoms exchange one or more pairs of electrons. The two atomic nuclei are concurrently drawing these electrons to them. The sharing of electron pairs between atoms occurs in covalent bonds.

In contrast to polar covalent bonds, which are formed when electrons are exchanged between atoms with uneven electronegativity, electron pairs shared between atoms with equal or very similar electronegativity form nonpolar covalent bonds, such as H-H or C-H. (e.g., H–O).

Therefore, when the difference between the electronegativities of two atoms is too tiny for an electron transfer to take place to create ions, a covalent bond is formed.

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Answer:

D

Explanation:

ew

When an object is moving with a constant velocity, you know the magnitude of speed.

Velocity is a vector quantity that has both magnitude and direction. If an object moves with a constant velocity, the magnitude of its velocity does not change, which means that the speed is constant.

The speed of an object moving with constant velocity can be determined using the formula:

v = d/t

where v is the speed, d is the distance traveled, and t is the time taken.

Anytime an object is moving with a constant velocity, it is not accelerating.

This means that the net force acting on the object is zero, or in other words, the forces acting on the object are balanced.

In such a scenario, the object will continue to move in a straight line with the same speed and direction until acted upon by an external force.

If an object is moving with a constant velocity in one direction, it is important to note that the same velocity can also be achieved by an object moving with the same magnitude of velocity but in the opposite direction.

This is because velocity has both magnitude and direction, so two vectors with equal magnitude but opposite direction are considered equal in magnitude but opposite in direction.

This means that velocity is a vector quantity that can be represented graphically using a vector diagram.

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If intensity is energy per unit area per unit time then how kinetic energy of photoelectron is constant with increasing intensity of light and it increases when frequency of light is increased

The amount of energy that a wave may transfer to a unit area of a surface each second is measured as the wave's intensity. (Watts per square metre are used to measure intensity.) A sound wave's frequency is equal to its rate of vibration, and its intensity is determined by its amplitude.

You may have the impression that the greater the frequency, the louder the noise we hear is, yet frequency does not indicate the volume of a sound. The energy of a vibration is quantified in decibels as intensity or loudness (dB). A sound has a high intensity if it is loud.

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Answer:

the time taken for the radioactivity of a specific isotope to fall to half its original value.

the time required for any specific property (e.g. the concentration of a substance in the body) to decrease by half.

Explanation:

I don't know if that's what your looking for

None of the cases violate the second law of thermodynamics or can be perpetual machines of the first or second kind, since all of them involve energy transfer in a closed system and some energy is always lost as heat due to irreversibilities.

Perpetual machines of the first kind violate the first law of thermodynamics by producing more energy than they consume, while perpetual machines of the second kind violate the second law of thermodynamics by converting all heat into work without any heat transfer to a colder reservoir. Let's analyze each of the four cases in Problem 5.34:

a. ˙Q H = 6 kW, ˙QL = 4 kW, ˙W = 2 kW

The energy equation is satisfied since the energy input is equal to the energy output plus the work done:

˙Q H = ˙QL + ˙W

6 kW = 4 kW + 2 kW

This engine does not violate the second law since the efficiency is less than 100%:

η = ˙W/˙QH = 2 kW/6 kW = 1/3

b. ˙Q H = 6 kW, ˙QL = 0 kW, ˙W = 6 kW

The energy equation is satisfied since the energy input is equal to the work done:

˙Q H = ˙W

6 kW = 6 kW

This engine violates the second law since the efficiency is 100% and all heat is converted into work without any heat transfer to a colder reservoir.

c. ˙Q H = 6 kW, ˙QL = 2 kW, ˙W = 5 kW

The energy equation is satisfied since the energy input is equal to the energy output plus the work done:

˙Q H = ˙QL + ˙W

6 kW = 2 kW + 5 kW

This engine does not violate the second law since the efficiency is less than 100%: η = ˙W/˙QH = 5 kW/6 kW = 5/6

d. ˙Q H = 6 kW, ˙QL = 6 kW, ˙W = 0 kW

The energy equation is satisfied since the energy input is equal to the energy output:

˙Q H = ˙QL

6 kW = 6 kW

This engine violates the second law since there is no work done and all heat is transferred from a hotter to a colder reservoir without any compensation.

Therefore, none of the four cases are perpetual machines of the first kind, but case b is a perpetual machine of the second kind.

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So that neither the patient nor the researchers can subconsciously alter the results.

Answer:

Total resistance in parallel is 1.2703136679494.

Total resistance in series is 155.Total resistance in series is 155.

Explanation:

Answer:

P = I V = I^2 R

R = 150 + 300 = 450 Ω

I = 150 / 450 = .333 amps

P(150) = .333^2 * 150 = 16.7 W

Answer:

Initial velocity, u = 23.33 m/s

Explanation:

Given the following data;

Acceleration = 2.5 m/s²

Distance = 4 km to meters = 4000 meters

Time = 0.8 mins to seconds = 0.8 * 60 = 48 seconds.

To find the initial velocity, we would use the second equation of motion;

\( S = ut + \frac {1}{2}at^{2}\)

Where;

S represents the displacement or height measured in meters.

u represents the initial velocity measured in meters per seconds.

t represents the time measured in seconds.

a represents acceleration measured in meters per seconds square.

Substituting into the equation, we have;

4000 = u*48 + ½*2.5*48²

4000 = 48u + 1.25*2304

4000 = 48u + 2880

48u = 4000 - 2880

48u = 1120

Initial velocity, u = 1120/48

Initial velocity, u = 23.33 m/s

Answer:

Give them assignment on the pandemic.

Explanation:

If you wish, each student can talk about some other aspect of the pandemic that seems important and interesting then you have to give them the assignment of presentation and give reward on them. The students will definitely make the presentation on other aspects of the pandemic and when they present it in the class it enhance the knowledge of other students as well.

Answer:

16Hz

Explanation:

Given parameters:

Speed of sound  = 400m/s

Wavelength  = 25m

Unknown:

Frequency of the wave  = ?

Solution:

To solve this problem;

      V  = F ∧  

V is the velocity

F is the frequency

∧ is the wavelength

      400  = F x 25

        F  = 16Hz

Answer:

16 hertz... I got it right on study-island

Explanation:

Answer: im so sorry i forget the answer

Explanation:

No work is being done on a block travelling vertically if an 84 N force has been applied to the right side of the block horizontally. Work is described as the result of applied force and object movement in the force's direction.

There is no change in the force's direction in this situation since the block is travelling vertically and the force is exerting itself horizontally. Therefore, there has been no work done on the block.

This situation might appear strange, but it serves to illustrate the notion that labour can only be accomplished when the applied force and displacement are in harmony.

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Answer: There is two event that needs to be made: 1. blue eyes, and 2. brown eyes. A spinner is made with a circle. A full circle has 360 degrees and it would be divided based on the probability of the event.

Blue eyes have 25% chance, so the angle of the spinner would be 25%*360°= 90°

Brown eyes have 75% chance, so the angle of the spinner would be 25%*360°= 270°

So, the 90° of the circle would be written as 1(blue eyes) and 270° of the circle will be written as 2(brown eyes).

Explanation: u welcome

Answer: I have no clue

Explanation: I don’t know

Answer:

longitudinal wave

OK hope this will help you

The mass of 1.2 x 10²⁴ molecules of F₂ is 75.62 g.

The question can be calculated by using Avogadro's number and the molar mass of F₂.
First, we need to find the number of moles of F₂ in 1.2 x 10²⁴ molecules. We can do this by dividing the number of molecules by Avogadro's number (6.02 x 10²³ molecules/mol):

moles of F₂ = 1.2 x 10²⁴/6.02 x 10²³

moles of F₂ = 1.99 mol

Next, we need to find the molar mass of F₂. The atomic mass of fluorine is 19.00g/mol, so the molar mass of F₂ is:

Molar mass of F₂ = 2 x 19.00 g/mol

Molar mass of F₂ = 38.00 g/mol

Finally, we can calculate the mass of 1.2 x 10²⁴ molecules of F₂ by multiplying the number of moles by the molar mass:
mass of F₂ = 1.99 x 38.00

mass of F₂ = 75.62 g
Therefore, the mass of FF₂ is 75.62 g.

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The angle in radians through which the wheel rotates can be determined using the formula:

Angle (in radians) = (Number of revolutions) × (2π)

Given that the wheel is rotating at a rate of 16 rev/s for a time interval of 9 seconds, we can calculate the number of revolutions by multiplying the rate by the time:

Number of revolutions = (16 rev/s) × (9 s) = 144 rev

Substituting this value into the formula, we can find the angle in radians:

Angle (in radians) = (144 rev) × (2π) = 288π radians

Therefore, in a time interval of 9 seconds, the wheel rotates through an angle of 288π radians.

To understand why we use the formula Angle (in radians) = (Number of revolutions) × (2π), it's important to note that one revolution corresponds to an angle of 360 degrees or 2π radians. In this case, the wheel is rotating at a given rate, so multiplying the rate by the time gives us the number of revolutions. Multiplying the number of revolutions by 2π gives us the angle in radians.

By performing the calculations without using the listed phrases, we arrive at the result of 288π radians for the angle through which the wheel rotates in a time interval of 9 seconds.

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