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3 years ago

HELP WITH SCIENCE STAAR QUESTIONS

Physics

1 answer:

nikdorinn [45]3 years ago

5 0

Answer:

EASY PEASY LEMON-SQUEEZY.

Explanation:

Mark Brainliest.

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An uncharged 30.0-µF capacitor is connected in series with a 25.0-Ω resistor, a DC battery, and an open switch. The battery has

kolezko [41]

Answer:

(a) Maximum current through resistor is 1.43 A

(b) Maximum charge capacitor receives is $1.50\times 10^{-3}\text{ C}$ .

Explanation:

(a)

In an RC (resistor-capacitor) DC circuit, when charging, the current at any time, t, is given by

$I(t) = I_0e^{-t/\tau}$

Here, $I_0$ is the maximum current and τ represents time constant which is given by RC (the product of the resistance and capacitance).

The maximum current is given by

$I = \dfrac{V}{R_\text{eff}}$

V is the emf of the battery and $R_\text{eff}$ is the effective resistance.

In this question, $R_\text{eff}$ = 10.0 Ω + 25.0 Ω = 35.0 Ω

$I = \dfrac{50.0\text{ V}}{35.0\ \Omega} = 1.43\text{ A}$

(b) The maximum charge is given

Q = CV

where C is the capacitance of the capacitor

$Q = (30.0\times10^{-6}\text{ F})(50.0\text{ V}) = 1.50\times 10^{-3}\text{ C}$

3 0

4 years ago

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Consider two displacements, one of magnitude 3 m and another of magnitude 4 m. Show how the displacement vectors may be combined

Rufina [12.5K]

Answer:

Explanation:

A = 3m

B = 4 m

let the angle between the two vectors is θ.

the resultant of two vectors is given by

$R=\sqrt{A^{2}+B^{2}+2ABCos\theta }$

(a) R = 7 m

So, $7=\sqrt{3^{2}+4^{2}+2\times 3\times 4 Cos\theta }$

49 = 9 + 16 + 24 Cosθ

Cosθ = 1

θ = 0°

Thus, the two vectors are inclined at 0°.

(b) R = 1 m

So, $1=\sqrt{3^{2}+4^{2}+2\times 3\times 4 Cos\theta }$

1 = 9 + 16 + 24 Cosθ

Cosθ = - 1

θ = 180°

Thus, the two vectors are inclined at 180°.

So, $5=\sqrt{3^{2}+4^{2}+2\times 3\times 4 Cos\theta }$

25 = 9 + 16 + 24 Cosθ

Cosθ = 0

θ = 90°

Thus, the two vectors are inclined at 90°.

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3 years ago

When light passes through a convex lens, it does this.....

Tpy6a [65]

Explanation:

6. Converge or come together

7. convex

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3 years ago

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2. An electrical heater 200mm long and 15mm in diameter is inserted into a drilled hole normal to the surface of a large block o

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Answer:

The final temperature is 50.8degrees celcius

Explanation:

Pls refer to attached handwritten document

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4 years ago

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Which nucleus completes the following equation?

Archy [21]

Answer:

I think B but I could be wrong

Explanation:

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3 years ago