What is the formula of iron(III) oxide?

Protons and electrons are the two equally abundant particles in an atom.

The atom's nucleus contains protons, which are subatomic particles with a positive charge. A +1 positive electric charge permeates each proton.

An atom's nucleus is surrounded by electrons, which are subatomic particles with a negative charge. An electric charge of -1 is carried by each electron.

The number of protons in the nucleus of a neutral atom is equal to the number of electrons encircling the nucleus. The atom becomes electrically neutral when the balance of positive and negative charges results in a net electric charge of zero.

An atom with the atomic number 6 for carbon, for instance, contains six protons and six electrons. Similar to this, an atom of sodium, which has an atomic number of 11, contains 11 protons and 11 electrons.

An atom is stable and maintains its distinctive chemical properties because it has an equal number of protons and electrons.

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The frequency and wavelength of the sound wave with the given time period and speed are 500Hz and 0.688m respectively.

What is Period and Wavelength?

Period is simply the time taken for a complete cycle of vibration to pass a given point. Frequency is expressed as;

f = 1/T

Where f is frequency and T is period of time.

Given that;

• Period T = 0.002s
• Frequency f = ?

f = 1/0.002s

f = 500s⁻¹

f = 500Hz

Wavelength is simply the distance over which the shapes of waves are repeated. It is the spatial period of a periodic wave.

From the wavelength, frequency and speed relation,

λ = s ÷ f

Where λ is wavelength, s is speed and f is frequency.

Given that;

• Speed c = 344m/s
• Frequency f = 500Hz
• Wavelength λ = ?

λ = s ÷ f

λ = 344m/s ÷ 500s⁻¹

λ = 0.688m

Therefore, the frequency and wavelength of the sound wave with the given time period and speed are 500Hz and 0.688m respectively.

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Answer:

Given

Time (T) = 0.002 sec

Velocity(V) = 344 m/s

Frequency (f) = ?

Wavelength (w) = ?

Explanation:

We know that

Frequency (f) = 1/ t

= 1/ 0.002

= 500 hertz

Now

wavelength = V/f

= 344/500

= 0.688 m

Answer:

option "c" is correct

Explanation:

Physical science or Physics is the study of matter, energy and their mutual relationship.

Answer: C

Explanation:

Calculate EkA -kinetic energy of car A

m=1000kg

Va=16.66 m/s

EkA=m*Va²/2

Eka=(1000kg*277.556m²/s²)/2

Eka=138 777.8 J

Calculate kinetic energy of CarB:

m=2000 kg

Vb=8.33 m/s

Ekb=(m*Vb²)/2

Ekb=(2000kg*69.39m²/s²)/2

Ekb=69 388.9 J

compare Eka with EkB

Eka/Ekb=138 777.8 J/69 388.9

Eka/Ekb=2

Final answer:

The kinetic energy of car A is twice as much as that of car B. This is calculated using the formula for kinetic energy, which is 1/2 * mass * (velocity)^2.

Explanation:

To compare the kinetic energy of car A with that of car B, we first need to understand the mathematical formula for kinetic energy, which is 1/2 * mass * (velocity)^2.

Let's calculate for each car:

• For car A: kinetic energy = 1/2 * 1000 kg * (60 km/hr)^2 = 1800000 Joules
• For car B: kinetic energy = 1/2 * 2000 kg * (30 km/hr)^2 = 900000 Joules

Therefore, car A has twice as much kinetic energy as car B.

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