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IceJOKER [234]
4 years ago
10

Someone help in physics half life

Physics
1 answer:
saveliy_v [14]4 years ago
4 0
To get the number of unstable atoms:
Column 3:  take 900 - 90 = 810  The numbers from column 2

To get the Number of decayed atoms:
take the 810 * 10% = 810 * .1 = 81

Follow the pattern for the rest of the table.
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goldenfox [79]

Answer:

<em>Well, I think the best answer will be is </em><em>B) Gravity. Good luck!</em>

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3 years ago
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What makes a planet different from other celestial bodies?.
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Answer:

It's more habitable.

Explanation:

The atmosphere, calculated to equations, are a lot more pulled down.

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3 years ago
Which object below would likely show the largest effort of air resistance when falling
blsea [12.9K]
The correct answer is C.) a leaf
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3 years ago
A cannon tilted upward at 30° fires a cannonball with a speed of 100 m/s. At that instant, what is the component of the cannonba
Sonja [21]

Answer:

the cannonball’s velocity parallel to the ground is 86.6m/S

Explanation:

Hello! To solve this problem remember that in a parabolic movement the horizontal component X of the velocity of the cannonball is constant while the vertical one varies with constant acceleration.

For this case we must draw the velocity triangle and find the component in X(see atached image).

V= Initial velocity=100M/S

cos30=\frac{Vx}{V}

V= Initial velocity=100M/S

Vx=cannonball’s velocity parallel to the ground

Solving for Vx

Vx=Vcos30

Vx=(100m/S)(cos30)=86.6m/s

the cannonball’s velocity parallel to the ground is 86.6m/S

6 0
3 years ago
A light-emitting diode (LED) connected to a 3.0 V power supply emits 440 nm blue light. The current in the LED is 11 mA , and th
zimovet [89]

Answer:

3.73 * 10^16   photons/sec

Explanation:

power supply = 3.0 V

Emits 440 nm blue light

current in LED = 11 mA

efficiency of LED = 51%

<u>Calculate the number of photons per second the LED will emit </u>

first step : calculate the energy of the Photon

E = hc / λ

   =(  6.62 * 10^-34 * 3 * 10^8 )  / 440 * 10^-9

   = 0.0451 * 10^-17  J

Next :

Number of Photon =( power supply * efficiency * current ) / energy of photon

= ( 3 * 0.51 * 11 * 10^-3 ) / 0.0451 * 10^-17

= 3.73 * 10^16 photons/sec

3 0
3 years ago
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