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Andrej [43]
3 years ago
12

Photochemical smog, lowered air quality, and increased greenhouse gas release is much more common in urban areas compared to rur

al areas. What explains the lowered air quality association with urban areas?
A. Rural areas have more green spaces that filter the air through plants.

B. More fossil fuels are used for combustion in industry and cars, which are more concentrated in urban areas.

C. Urban areas have higher levels of litter and solid waste from population dense neighborhoods.

D. Urban areas have less water recharge zones, causing particulates and pollutants to evaporate into the air rather than infiltrate into the ground.
Physics
2 answers:
Ann [662]3 years ago
8 0

Answer:

B

Explanation:

harina [27]3 years ago
5 0

Answer:

C

Explanation:

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What is the total energy q released in a single fusion reaction event for the equation given in the problem introduction? use c2
kkurt [141]

Answer:

4.3\cdot 10^{-12} J

Explanation:

The fusion reaction in this problem is

4^1_1H \rightarrow ^4_2He +2e^+

The total energy released in the fusion reaction is given by

\Delta E = c^2 \Delta m

where

c=3.0\cdot 10^8 m/s is the speed of light

\Delta m is the mass defect, which is the mass difference between the mass of the reactants and the mass of the products

For this fusion reaction we have:

m(^1_1H)=1.007825u is the mass of one nucleus of hydrogen

m(^4_2 He)=4.002603u is the mass of one nucleus of helium

So the mass defect is:

\Delta m =4m(^1_1 H)-m(^4_2 He)=4(1.007825u)-4.002603u=0.028697u

The conversion factor between atomic mass units and kilograms is

1u=1.66054\cdot 10^{-27}kg

So the mass defect is

\Delta m =(0.028697)(1.66054\cdot 10^{-27})=4.765\cdot 10^{-29}kg

And so, the energy released is:

\Delta E=(3.0\cdot 10^8)^2(4.765\cdot 10^{-29})=4.3\cdot 10^{-12} J

6 0
3 years ago
A car going 22 m/s increases its speed to pass a truck. Five seconds later the car is going 35 m/s. Calculate the acceleration o
jonny [76]

Answer:

I don't know

Explanation:

4 0
3 years ago
Read 2 more answers
Shows a few energy levels of the mercury atom. one valence electron is always in the 6s state; the other electron changes states
Sever21 [200]
Give me some answer choices and i will be happy to help
5 0
3 years ago
The mass of an object does not depend on its shape - it stays the same. Give an example that would prove this to be true.
lianna [129]

Answer:

it depends on the density.

an object can be small but way more.

Explanation:

8 0
3 years ago
The voltage between the cathode and the screen of a television set is 22 kV. If we assume a speed of zero for an electron as it
il63 [147K]

Answer:

v= 8.8*10⁷ m/s

Explanation:

  • Assuming no friction present, the change in electrical potential energy, must be equal in magnitude, to the change in kinetic energy of the electron.
  • The change in the electrical potential energy, can be expressed as follows:

       \Delta U = (-e)*\Delta V

  • The change in kinetic energy, assuming that the electron started from rest, can be written as follows:

       \Delta K = \frac{1}{2} *m*v^{2}

       ⇒\Delta K = -\Delta U

  • From the equation above, replacing by ΔK and ΔU, we have:

       -\Delta U =- (-e)*\Delta V =\Delta K = \frac{1}{2} *m*v^{2}

  • Solving for v:

        v=\sqrt{\frac{2*e*\Delta V}{m_{e}} } =\sqrt{\frac{2*1.6e-19C*22e3V}{9.1e-31kg}} }\\ v= 8.8e7 m/s

4 0
3 years ago
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