What is the mass number of the missing daughter nuclei?

Answer:

v = 72.54 m/s

Explanation:

We have,

Length of a guitar string is 0.62 m

Frequency of a guitar string is 234 Hz

For guitar string,

[tex]L=2\lambda\\\\\lambda=\dfrac{L}{2}\\\\\lambda=\dfrac{0.62}{2}\\\\\lambda=0.31\ m[/tex]

The velocity of the wave in the string is given by :

[tex]v=f\lambda\\\\v=234\times 0.31\\\\v=72.54\ m/s[/tex]

So, the velocity of the waves in the string is 72.54 m/s.

Answer:

290.16

Explanation:

i got it right

Answer:

The answer is C. X:north Y: north

Explanation:

Just took the test

Based on the field lines poles of the magnets X=North and Y=south

Every magnet has the two poles that is north and the south. similarly earth also have two poles north and south and acts as a magnet.

just from that concepts the filed lines near the poles X and Y of the two magnets have north poles.

Hence based on the field lines poles of the magnets X=North and Y=south

To know more about Magnet and magnetic field follow

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Answer:

Explanation:

Answer:

b

Explanation:

Answer:

Gypsum

Explanation:

Gypsum is a soft sulfate mineral composed of Calcium Sulfate di-hydrate. It is widely used in composition of fertilizer. It is also known as land plaster. On adding gypsum to soil, the quality of soil is improved. It conditions the soil and adds nutrients. The properties of soil is improved. Hence, the correct answer is Gypsum.

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Answer:

Period T = 0.5 s

Frequency F = 2 Hz

Wave speed V = 4 m/s

Explanation:

Given that the

Number of oscillations = 30

Time taken = 15 seconds

The distance between two consecutive crests is called wavelength

Wavelength = 2m

Period is the ratio of time and the number of oscillations

Period T = 15/30 = 0.5 seconds

Frequency F is the reciprocal of period. That is,

F = 1/T

F = 1/0.5 = 2Hz

Wave speed V is the product of frequency and wavelength

V = 2 × 2 = 4m/s

Answer:

Answer:

Period T = 0.5 s

Frequency F = 2 Hz

Wave speed V = 4 m/s

Explanation:

Answer: The answer is b

Answer:

Option A. ⅓V

Explanation:

We'll begin by calculating the total resistance in the circuit. This is illustrated below:

R1 = 1Ω

R2 = 2Ω

R3 = 3Ω

RT =..?

Since all three resistor are in series connections, the total resistance can obtain as follow:

RT = R1 + R2 + R3

RT = 1 + 2 + 3

RT = 6Ω

Next we shall determine the current flowing through the circuit.

Voltage (V) = 2V

Resistor (R) = 6Ω

Current (I) =..?

V = IR

2 = I x 6

Divide both side by 6

I = 2/6

I = ⅓A

Finally, we can obtain the voltage across the 1Ω resistor as follow:

Resistor (R) = 1Ω

Current (I) = ⅓A

Voltage (V) =?

V = IR

V = ⅓ × 1

V = ⅓V

Therefore, the potential difference across the 1Ω resistor is ⅓V

Answer:

X,W,Y,Z

Explanation:

It is what it is. and i took the edge test

Answer:

or b on edge 2021

Explanation:

Answer:

calendar

Explanation:

Answer:

The correct option is (A).

Explanation:

The direction of electric force is in the direction of electric field. The electric force acting on a charged particle is given by :

F = qE, q is magnitude of charge

We have, a negative test charge experiences a force to the right as a result of an electric field. It would mean that the electric field points to the left because the force on a negative charge is opposite to the direction of the field.

Answer: 3

Wavelength = 0.76m

Explanation:

When sound wave is travelling at standard temperature and pressure ( STP), its speed will be equal to normal speed of sound which is equal to 331 m/s

Given that the period of the wave is 0.0023 seconds.

Wave speed = wavelength/period

Substitute the wave speed and the period to obtain wavelength

331 = wavelength/0.0023

Cross multiply

Wavelength = 331 × 0.0023

Wavelength = 0.7613 metre

The wavelength of this sound is closest to 0.76 m

Answer: a flow of electric charge

Explanation:

Answer: Metals

Explanation:

The metals are the conductors of electricity. These are made up of atoms which conducts electricity in the form of electrons in the outer shell that can move freely. These take away the electric charge on the entire metallic system. This way the metal conducts electricity and can also pass electricity to other surfaces if come in their contact. Thus the metals are used for creating equipment of technological importance.

Answer:

Metals

Explanation:

Answer:

true

Explanation:

iron or steel tools can be dangerous ignition source

Answer:

(A) True...

Explanation:

Answer:

Family

Explanation:

The groups of elements are called families

Answer:

60 ohms

Explanation:

From Ohm's Law:

V = IR

Where V = 120volts

I = 2A

R = ?

Note that R,V and I represents resistance, voltage and current respectively.

Substituting the above values into the formula.

V = IR

120v = 2×R

120= 2R

Making R the subject

R =120/2

R = 60 ohms

Hence the resistance of the toaster will be 60 ohms.

Answer: Number of valence electrons determine how fast or easy for an atom to gain stability. Either by gaining electrons or by losing electrons.

Group one and seven elements react fast because they only have one electron to gain or lose.

Explanation:

Number of valence electrons tell us the number of electrons an atom will gain or lose in order to attain stability in electron configuration.

All the elements in a particular group will have the same number of valence electrons as follows:

Group one - 1 valence electron

Group two - 2 valence electrons

Group three - 3 valence electrons

Group four - 4 valence electrons

Group five - 3 valence electrons

Group six - 2 valence electrons

Group seven - 1 valence electron

Group eight - 0 valence electron

Some elements are more reactive than the others because of the electron affinity, oxidation state and electronegativity of the atoms

For instance, elements in group 7 are more reactive than others because of their oxidation state and they have very high electronegativity.

Also, group one elements are more reactive because they only have one electron to loose.

Answer: The charge in the middle sphere will be distributed by induction.

Explanation: The charge in the middle sphere will be distributed through induction. The ends of the two uncharged bodies develop same charges and mutual attraction occurs. The positive charged body pushes the positive charged of the two uncharged bodies farther away and attracts the negative electrons in them.

Answer:

Its C.

Explanation:

When the two forces of gravity and force resistance become the same, the object no longer speeds up , and it doesn't slow down either. This is called terminal velocity .

So ,C is the correct answer .

Hope it works out !!

When the force of air resistance equals the force of gravity, the  falling object  reaches terminal velocity. Hence, option (C) is correct.

The maximum velocity attained by an object as it falls through a fluid is known as terminal velocity. It occurs when the sum of the drag and buoyancy forces acting on the object equals the downward force of gravity. Because the object's net force is zero, it has no acceleration.

An object is moving at its terminal velocity in fluid dynamics if its speed is constant due to the restraining force exerted by the fluid through which it is moving.

As an object's speed increases, so does the drag force acting on it, which is also affected by the substance it is passing through. The drag or force of resistance will equal the gravitational pull on the object at some speed.

Learn more about terminal velocity here:

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The larger the paper airplane the more it will weigh, the more it weighs the more lift will be needed to keep it flying. Eventually weight will become greater than lift and the paper airplane will decend to the ground. In adition the larger the paper airplane the larger its wings can be.

Answer:

thermal

Explanation:

when an object's atoms move it causes friction, when friction happens, it heats ups causing thermal energy

Answer:

Thermal

Explanation:

you have to use friction to make thermal energy that's why when you rub your hands together it gets hotter and hotter. When you are playing tug of war and you get a rope burn it is because your hand is getting in contact with the rope that is slipping out of your hand

PLS CORRECT ME IF IM WRONG

Answer: No

Explanation:

Laser can cut many things,

its cutting is so popular largely because of its versatility.  Laser cutterscan cut a wide variety of materials – anything from paper, wood, cork, acrylic and foam to different types of metals. Still, there are some materials that would  seemingly fit well into this list but should never be cut using a laser cutter.

Answer:

Current, I = 0.48 A

Explanation:

We have,

Resistance of a circuit is 250 ohms

Voltage of the battery is 120 V

It is required to find the current flowing in the circuit. Let I is the electric current. Ohm's law is given by :

[tex]V=IR\\\\I=\dfrac{V}{R}\\\\I=\dfrac{120}{250}\\\\I=0.48\ A[/tex]

So, the current in the circuit is 0.48 A.

Answer:

1.2 Hz

Explanation:

Frequency: This can be defined as the number of cycles completed in one seconds. The unit of frequency is Hertz (Hz)

From the question above,

f = N/t.................... Equation 1

Where f = frequency, N = number of wave or cycle completed by Johnny, t = time take to complete the waves.

Given: N = 12 waves, t = 10 s

Substitute into equation 1

f = 12/10

f = 1.2 Hz

Answer: Find the answer in the explanation

Explanation:

The earth wire act as a protective conductor in which current flows to the earth. Whenever there is a faulty flow of current, the earth wire will protect an iPad with a metal casing from letting you get shocked by allowing the faulty current to flow directly to the earth.

With the use of fuse, the wire break when it detects a faulty flow of current and the device will automatically switch off because of break in circuit.

These are to protect you from electric shock from the iPad metal casing.

Answer:

D:

Explanation:

Conduction because the heat energy is transferring directly from the separate metals convection involves "currents" like in a liquid or a gas. When you turn on the stove with a pot of water on the burner the water at the bottom of the pot gets heated first almost immediately this water rises and cooler water falls. Basically the water is "stirring" or shifting, exchanging the heat energy this is why water heats so evenly.

Answer:

D

Explanation:

The heat transfer that we'll have will be:

- At first, the metal bar will emanate heat through radiation, to the atmosphere, and to the second metal, through conduction.

- Because of this, the second bar will start to increase it's temperature, up to the fusion point, spending the energy received on the fusion, and also radiating heat to the atmosphere. It won't emit heat in any other form, since heat transmission can happen only from a hot body to a cooler one, and the only things in contact are the two bars.