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3 years ago

What conclusions can be drawn about the existence of carbon-12, carbon-13, and carbon-14?

2 answers:

7 0

These are isotopes of carbon and they all contain 6 protons and 6 electrons but each contains a difference number of neutrons - 6, 7, and 8 respectively.

^ This is the answer because an isotope changes the atomic mass, NOT atomic number. That means that the neutrons are changed, not the protons.

mars1129 [50]3 years ago

3 0

Answer: These are isotopes of carbon and they all contain 6 protons and 6 electrons but each contains a difference number of neutrons - 6, 7, and 8 respectively.

Explanation: Isotopes of an element have similar number of protons but different number of neutrons.

General representation of an element is given as: $_Z^A\textrm{X}$ where,

Z represents Atomic number (for neutral atom) = number of protons= no of electrons

A represents Mass number = number of protons + number of neutrons

X represents the symbol of an element

Thus $_6^{12}\textrm{C}$ , $_6^{13}\textrm{C}$ and $_6^{14}\textrm{X}$ all contain same number of protons i.e 6 but contain (12-6) =6, (13-6)=7 and (14-6)=8 neutrons respectively.

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A 405 Hz tuning fork and a piano key are struck together, and no beats are heard. When a 402 Hz tuning fork and the same piano k

NeX [460]

The difference between the frequencies of the piano key and the tuning fork gives the frequency of the beats.

When the tuning fork is 405 Hz, and no beats are heard, then the piano key is also 405 Hz.

When the piano key is 405 Hz and the tuning fork is 402 Hz, then 405 - 402 = 3 beats are heard.

The piano key is 405 Hz.

4 0

4 years ago

A rolling (without slipping) hoop with a radius of 0.27 m and a mass of 1.80 kg climbs an incline. At the bottom of the incline,

Irina-Kira [14]

Answer:

Explanation:

Angular speed of hoop ω = v / r

= 8.90 / .27

= 32.96 rad / s

Translational kinetic energy = 1/2 mv²

= .5 x 1.8 x 8.9²

= 71.29 J

Rotational kinetic energy = 1/2 Iω²

= 1/2 mR²x ω²

= 1/2 mv²

= 71.29 J

Total kinetic energy

= 2 x 71.29

= 142.58 J

This energy will be used to attain height

If h be the height attained

mgh = 142.58

h = 142.58 / mg

= 142.58 / 1.8 x 9.8

= 8.08 m .

6 0

3 years ago

Which of the following statements are true of the horizontal motion of projectiles? List all that apply.a. A projectile does not

r-ruslan [8.4K]

Answer:

d. A projectile with a horizontal component of motion will have a constant horizontal velocity.

f. The horizontal velocity of a projectile is unaffected by the vertical velocity; these two components of motion are independent of each other.

g. The horizontal displacement of a projectile is dependent upon the time of flight and the initial horizontal velocity.

h. The final horizontal velocity of a projectile is always equal to the initial horizontal velocity.

Explanation:

When we are dealing with parabolic motion, the x-component of the velocity remains the same (hence, in the case of the horizontal component, the acceleration will always be zero), while the y-component always change because it is affected by the acceleration due gravity that acts verticaly.

On the other hand, the horizontal displacement $x$ of the projectile is mathematically expressed as:

$x=V_{ox} t$

Where:

$V_{ox}$ is the projectile's horizontal component of the initial velocity

$t$ is the time the parabolic motion lasts

This means the projectile's horizontal displacement is directly proportional to the horizontal component of the initial velocity and the total time the projectile describes the parabolic motion.

Of course, all of this considerations are assuming this is an ideal parabolic path and there is no air resistance.

5 0

4 years ago

Explain the difference between science usage and common usage for the term resistance

san4es73 [151]

Keremiad is a long literary work, usually in prose, but sometimes in verse, in which the author bitterly laments the state of society and its morals in a serious tone of sustained invective, and always contains a prophecy of society's imminent downfall.

3 0

3 years ago

You are given four resistors, 2 ohms, 3 ohms, 5 ohms, and 10 ohms. Your friend say you can connect them so you obtain an equival

AlexFokin [52]

If we will connect the resistors 2ohms, 3ohms, 5ohms in series and the 10ohms resistance parallel then we get equivalent resistance of 5 ohms.

The equivalent circuit is,

R equivalent for the series connection is,

$\begin{gathered} Req(S)=2+3+5=10ohms \\ Now,\text{ } \\ Req\text{ }for\text{ }10\text{ }ohms\text{ }and\text{ }10\text{ }ohms\text{ }is, \\ \frac{1}{Req}=\frac{1}{10}+\frac{1}{10}=\frac{2}{10}=\frac{1}{5} \\ So, \\ Req=5\text{ ohms} \end{gathered}$

The equivalent resistance is 5 ohms.

So your friend is saying true.

6 0

1 year ago