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3 years ago

14

Tala wants to create a sound echo. She can create the echo using a pane of glass or a carpet square. Which one does she choose?

Explain.

1 answer:

Alisiya [41]3 years ago

7 0

Carpet asorbs sound, so glass should make it echo.

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How does the evolutionary process contradict the second law of thermodynamics?

dlinn [17]

Evolution, the argument goes, is a decrease of entropy, because it involves things getting more organized over time, while the second law says that things get more disordered over time. So evolution violates the second law.

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3 years ago

The electric field strength in the space between two closely spaced parallel disks is 1.0 105 N/C. This field is the result of t

balu736 [363]

Answer:

$D=2.996\times 10^{-2} m$

Explanation:

*Assume the parallel disks have equal diameters.

Given the electric strength as $1.0\times 10^5 N/C.$ transferring $3.9\times 10^9$ electrons, the disk's Area can be calculated using the formula:

$E=\frac{\eta}{\epsilon_o}=\frac{Q}{A\epsilon_o}\\\\A=\frac{Q}{E\epsilon_o}\\\\=\frac{(3.9\times 10^9)\times (1.6\times10^{-19})}{(1.0\times 10^5 )\times (8.85\times10^{-12})}\\\\A=7.0508\times 10^{-4} \ m^2$

#We now calculate the disks diameter:

$A=\pi(D/2)^2\\\\2\sqrt{\frac{A}{\pi}}=D\\\\=2\sqrt{7.0508\times 10^{-4}/\pi}\\\\D=2.996\times 10^{-2} \ m$

Hence, the diameter of the disks is $D=2.996\times 10^{-2} m$

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4 years ago

What voltage is needed to cause a 2A current flow through a 102 resistor?

Harman [31]

Answer:

204 V

Explanation:

V=IR

V= (2A)(102Ω)

V=204 V

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3 years ago

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Use barrier island in a sentence

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A car traveling at 45 miles per hour is brought to a stop, at constant deceleration, 132 feet from where the brakes are applied.

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Answer:

c

Explanation:

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