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3 years ago

6

Which of the five themes of geography would a person most likely use to study the importation of Chinese goods into the United S

tates?
A.
places and regions
B.
movement
C.
human systems
D.
physical systems

1 answer:

Morgarella [4.7K]3 years ago

7 0

B. Movement would be the correct answer.

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lidiya [134]

I suppose it's C. All the other answers are everything but accurate to me

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3 years ago

Calculate the noise voltage spectrum Su(f) on a paraller RC circuit with R=1 kOhm and C=1 nF. (Don't forget to provide the unit!

ladessa [460]

Answer: 10^-3 V^2/Hz

Explanation:

1 Hz:

Su(f) = No * |H(f)|^2

= 10^-3 * 1/(1+(2*pi*f*R*C)^2)

= 10^-3 V^2/Hz

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3 years ago

The hydrocarbon used to manufacture foam plastics is called styrene. Analysis shows composition to be 92.25% C and 7.75% H. Anal

zhannawk [14.2K]

Answer:

molecular formula = $C_{8} H_{8}$

Explanation:

Given data

c = 92.25%

H = 7.75%

molar mass = 104 g/mol

to find out

the empirical and molecular formula for styrene

solution

we know that

styrene 1 g contain = 0.9225 g C and 0.0775 g H

so

C = 104 × 0.9225 g / 12 g/mol

C = 7.995 mol = approx 8 mol

and

H = 104 × 0.0775 g / 1 g/mol

H = 8.06 mol = approx 8 mol

so we say that 1 mole of styrene have 8 mole of C and H

so

molecular formula = $C_{8} H_{8}$

8 0

3 years ago

Para proteger un computador de sobrecargas eléctricas, Juan coloca un filamento delgado de cobre llamado fusible en su circuito,

Verdich [7]

Answer:

Los fusibles están diseñados de tal forma que estos se "rompen" o se funden, cuando la demanda eléctrica supera un dado valor (cuando demasiada electricidad pasa a través de el).

Una vez el filamento se rompe, la corriente ya no puede circular por el (podes pensar en esta situación como un cable roto, la electricidad no puede circular por este cable)

Entonces, al romperse el filamento, en caso de una sobrecarga eléctrica, el flujo de electricidad se corta, y de esta forma se protege al computador de posibles sobrecargas.

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3 years ago

Consider a simple harmonic oscillator made from a block of mass m attached to a ng constant k. What changes could you make that

faust18 [17]

Answer:

energy would become four times

Explanation:

Kinetic energy K= 0.5mv^2

⇒ $v=\sqrt{\frac{2m}{K} }$

now, v'= 2v

$2v=v'=2\sqrt{\frac{2m}{K} }$

v'= $\sqrt{\frac{2\times4E}{m} }$

hence, speed can be doubled by four folding the energy or by decreasing mass to one fourth.

8 0

3 years ago