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PIT_PIT [208]
3 years ago
14

Help me with my physics, please

Physics
1 answer:
Readme [11.4K]3 years ago
7 0
The right answer would be

-20t+ 80
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According to Newton's Law of Cooling, if a body with temperature T 1 is placed in surroundings with temperature T 0, different f
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We can substitute the given values into the equation for T, given the surrounding temperature T0 = 0, initial temperature T1 = 140, constant k = -0.0815, and time t = 15 minutes.

T = 0 + (140 - 0)e^(-0.0815*15) = 140e^(-1.2225) = 41.23°F

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Would a bond between potassium and iodine most likely be covalent or ionic? Explain your answer
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3 years ago
The measure of an acute angle is between 0 degrees and 180 degrees. true false
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________ is possible given our increased use of fertilizers and technology for agriculture
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Explanation:

Farmers ' overuse of fertilizers and pesticides to improve crop yields is harmful to the environment and people's health. The use of fertilizers and pesticides has contributed to climate, water, and soil pollution problems. The nitrous oxide (N2O) formed by microbial activity on inorganic soil fertilizers allows ozone layer layer to deplete, and serves as a barrier against damaging UV rays emanating from the light.

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6 0
3 years ago
The work function (energy needed to remove an electron) of gold is 5.1 eV. Two pieces of gold (at the same potential) are separa
scoundrel [369]

Answer:

The value of L is 0.3 nm.

Explanation:

Given that,

Energy \phi= 5.1 eV

Transmission probability = 10⁻³

We need to calculate the value of L

We know that,

Formula of tunneling probability

T=Ge^{-2kL}....(I)

Where,

k=\dfrac{\sqrt{2m(E-U)}}{\hbar}....(II)

Where, m = mass of electron

E = \phi+U

\phi = E-U

Put the value in equation (II)

k=\dfrac{\sqrt{2\times9.1\times10^{-31}\times5.1\times1.6\times10^{-19}}}{1.055\times10^{-34}}

k=1.155\times10^{10} m^{-1}

From equation (I)

ln T=-2kLG

L=\dfrac{ln T}{-2kG}

L=\dfrac{ln 10^{-3}}{-2\times1.155\times10^{10}\times1}

L=2.99\times10^{-10}\ m

L=0.299\times10^{-9}\ m

L=0.3\ nm

Hence, The value of L is 0.3 nm.

7 0
3 years ago
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