Part A: Which TWO of the following best identify the central ideas of this speech?

Improvements Made to

stiks02 [169]

Answer:

The correct answer is D

Explanation:

Because I just did the USA Test

6 0

3 years ago

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"Among our ancestors, those who feared animals, darkness, and heights were more likely to survive long enough to reproduce." The

aleksandr82 [10.1K]

Answer:

Evolutionary

Explanation:

Since the early days, human has managed to learn and adjust to his environment, worked on developing and nurture the greatest feasible habits and mechanisms for survival. Survival was of the greatest priority, as prehistoric cavemen were living in a multitude of dangers, varying from infections to wild, starving animals, etc. As per the evolutionary psychology, our ancestors had psychological upsides, transferred these behavioral traits to subsequent generations, culminating in a generation that then had these adaptive behaviors phobias.

7 0

3 years ago

Consider that the capacitor is initially not charged and the voltage of the battery is 3.00 V. The switch is closed at ????????

EastWind [94]

Your question has some difficulties in symbols and variables to read. That's why I am re-writing (re-arranged) the Question's statement again which is:

Question:

For the R-C circuit shown in figure 1 on page 3, R= 100 ohms and C=1.00F.

A)What is the time constant of the R-C circuit?

B) consider that the capacitor is initially not charged and the voltage of the battery is 3.00 V. The switch is closed at t=0. Using the appropriate formulas, write down the voltage Vc(t) on the capacitor and the current I(t) in the circuit.

C) consider that the capacitor is initially fully charged to 3.00 V. The switch is open at t=0. Using the appropriate formulas, write down the voltage Vc(t) on the capacitor and current I(t) in the circuit.

Your Question is missing the figure as well, which is attached below, please find it in the attached file.

Answer:

Part.A

100 seconds

Part.B

Vc(t)=0V

I(t)=30mA

Part.C

Vc(t)=3.0V

I(t)=0A

Explanation:

Given Data:

Resistance=R=100 ohms

Capacitance=C=100F

Part.A: Time constant=T=?

Time constant:

Time required to charge the capacitor upto 63.23% of the applied voltage is called a Time constant.

As we know that time constant for the RC (circuit having only resistor and capacitor) is equal to product of resistance and capacitance

$T=R*C$

so $T=100*1$

$T=100seconds$

Part.B: Vc(t) and I(t)=? If switch is closed

Given Data:

Voltage of the battery=Vs=3.0V

Capacitor is not charged initially and switch is closed at t=0 means that the circuit will become short (because capacitor is charging) in which current I(t) exist and voltage Vc(t) is zero.

Short circuit:

The circuit in which current is maximum and voltage is zero.

Thus voltage on the capacitor is Vc(t)=0V

Now we can find I(t) as follow:

Thus, Applying Kirchoff's Law (sum of all voltages is zero) on the circuit in the figure attached below, we get

$V_{s}-V_{R}-V_{c}(t) =0$

putting values, we get

$3.0-I(t)*R-0=0$

$I(t)*100=3$

$I(t)=\frac{3}{100}$

Current in the circuit is $I(t)=0.03A\ OR\ 30mA$

Part.c: Vc(t) and I(t)=? if switch is opened

If switch is opened and capacitor is fully charged then the capacitor will act as a battery and will supply will voltage as it has stored the charge. The switch is open it means the circuit is open.

So current I(t) in the circuit is zero=0A

and voltage Vc(t) exist which can be found as:

Applying Kirchoff's law, we get

$V_{s} -V_{c}(t)=0 \\V_{R}\ does\ not\ exist\ because\ current\ in\ the\ circuit\ or\ through\ resistor\ is\ zero$

$V_{s}=V_{c}(t)$

thus voltage on the capacitor is $V_{c}(t)=3.0V$

6 0

3 years ago

When asked a question during a trivia game, sylvia is certain that her answer is correct, even though her teammates disagree. Sy

Leto [7]

I believe the answer is: overconfidence barrier

overconfidence barrier refers to the barrier that exist due to having too much confidence in our personal selfes,which make it impossible for us to be influenced by others to re-consider our opinion. This barrier often exist when we constantly put ourselves only to the people with similar opinion or have inherent need to please us

6 0

3 years ago

Draw the compass rose.

NikAS [45]

Its a star basically ya just go on g00gle “compass rose”

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3 years ago

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