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3 years ago

15

In one year, a large tree can remove from the air the same amount of carbon dioxide produced by a car travelling 500 miles. If N

ew York City contains approximately 600,000 trees, how many miles of a car traffic can trees clean in a year?

1 answer:

marissa [1.9K]3 years ago

7 0

I am so sure it's 600,000 x 500 so you get 300,000,000

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A parallel-plate air capacitor is made from two plates 0.210 m square, spaced 0.815 cm apart. it is connected to a 120 v battery

GuDViN [60]

Answer:

at the beginning: $2.3\cdot 10^{-10} F$

when the plates are pulled apart: $1.1\cdot 10^{-10} F$

Explanation:

The capacitance of a parallel-plate capacitor is given by

$C=k \epsilon_0 \frac{A}{d}$

where

k is the relative permittivity of the medium (for air, k=1, so we can omit it)

$\epsilon_0 = 8.85\cdot 10^{-12} F/m$ is the permittivity of free space

A is the area of the plates of the capacitor

d is the separation between the plates

In this problem, we have:

$A=0.210 m^2$ is the area of the plates

$d=0.815 cm=8.15\cdot 10^{-3} m$ is the separation between the plates at the beginning

Substituting into the formula, we find

$C=(1)(8.85\cdot 10^{-12}F/m)\frac{0.210 m^2}{8.15\cdot 10^{-3} m}=2.3\cdot 10^{-10} F$

Later, the plates are pulled apart to $d=1.63 cm=0.0163 m$ , so the capacitance becomes

$C=(1)(8.85\cdot 10^{-12}F/m)\frac{0.210 m^2}{0.0163 m}=1.1\cdot 10^{-10} F$

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Answer:

b) q large and m small

Explanation:

q is large and m is small

We'll express it as :

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As we know the formula:

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Bqv = $\frac{mv^{2} }{r}$

or Eq = $\frac{mv^{2} }{r}$

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Answer:

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