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hichkok12 [17]
3 years ago
10

Communities with cold winters often spread salt on roadways. Salt lowers the melting point of water, which means slippery snow a

nd ice will melt instead of building up on roads. While this does prevent car accidents, it poses certain problems. What is the most serious problem that could occur to local ecosystems due to road salt?
A
flooding from too much melting ice and snow

B
overpopulation because of fewer fatal accidents

C
damage to plant life because of excess salt in the soil

D
accidents involving deer and other animals that lick salt

Why are construction sites considered major sources of water pollution?
A
They introduce high levels of salt into local water sources.

B
Soil erosion rates accelerate dramatically, impacting water quality in streams and rivers.

C
They cause sinkholes to form, which pollute local water sources.

D
Sawdust leaches into the soil, causing the water that runs into rivers and streams to be cloudy and full of particles.
Physics
2 answers:
Sav [38]3 years ago
5 0

Answer:

The first question is C. The second question is B or A.

Hope I answered your question, have a nice day/night.

kipiarov [429]3 years ago
3 0

Answer:

First:

C

Second:

Not 100% sure but I think it's B

Explanation:

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Which best explains how fiber-optic technology has improved communication?
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When a surface is illuminated with electromagnetic radiation of wavelength 480 nm, the maximum kinetic energy of the emitted ele
algol [13]

Answer:

Max kinetic energy for 340 nm wavelength will be 2.238\times 10^{-19}j

Explanation:

In first case wavelength of electromagnetic radiation \lambda =480nm=480\times 10^{-9}m

Plank's constant h=6.6\times 10^{-34}J-s

Maximum kinetic energy = 0.54 eV

Energy is given by E=\frac{hc}{\lambda }=\frac{6.6\times 10^{-34}\times 3\times 10^8}{480\times 10^{-9}}=4.125\times 10^{-19}J

We know that energy is given

E=K_{MAX}+\Phi, here \Phi is work function

So 4.125\times 10^{-19}=0.54\times 10^{-19}+\Phi

\Phi =3.585\times 10^{-19}J

Now wavelength of second radiation = 340 nm

So energy E=\frac{hc}{\lambda }=\frac{6.6\times 10^{-34}\times 3\times 10^8}{340\times 10^{-9}}=5.823\times 10^{-19}J

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6 0
4 years ago
Suppose that an object undergoes simple harmonic motion, and its displacement has an amplitude A = 15.0 cm and a frequency f = 1
cestrela7 [59]

Answer:

Maximum speed ( v ) = 10.4 m/s (Approx)

Explanation:

Given:

Amplitude A = 15.0 cm = 0.15 m

Frequency f = 11.0 cycles/s (Hz)

Find:

Maximum speed ( v )

Computation:

Angular frequency = 2πf

Angular frequency = 2π(11)

Angular frequency = 69.14

Maximum speed ( v ) = WA

Maximum speed ( v ) = 69.14 x 0.15

Maximum speed ( v ) = 10.371

Maximum speed ( v ) = 10.4 m/s (Approx)

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3 years ago
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