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2 years ago

What is the meaning of the reference point in electric potential?.

Physics

1 answer:

mrs_skeptik [129]2 years ago

4 0

Answer:

<h3><u>ELECTRIC POTENTIAL</u></h3>

• the amount of work needed to move a unit charge from a reference point to a specific point against an electric field.

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If position vector r = bt^2i + ct^3j, where b and c are positive constants, when does the velocity vector make an angle of 450 w

vazorg [7]

$\vec r(t)=bt^2\,\vec\imath+ct^3\,\vec\jmath$

The velocity at time $t$ is

$\dfrac{\mathrm d\vec r(t)}{\mathrm dt}=2bt\,\vec\imath+3ct^2\,\vec\jmath$

Take two vectors that point in the positive $x$ and positive $y$ directions, such as $\vec\imath$ and $\vec\jmath$ . The dot products of the velocity vector with $\vec\imath$ and $\vec\jmath$ are

$\dfrac{\mathrm d\vec r(t)}{\mathrm dt}\cdot\vec\imath=2bt=\sqrt{4b^2t^2+9c^2t^4}\cos\theta$

and

$\dfrac{\mathrm d\vec r(t)}{\mathrm dt}\cdot\vec\jmath=3ct^2=\sqrt{4b^2t^2+9c^2t^4}\cos\theta$

We want the angles between these vectors to be 45º, for which we have $\cos45^\circ=\frac1{\sqrt2}$ . So

$\begin{cases}2\sqrt2\,bt=\sqrt{4b^2t^2+9c^2t^4}\\3\sqrt2\,ct^2=\sqrt{4b^2t^2+9c^2t^4}\end{cases}\implies3\sqrt2\,ct^2-2\sqrt2\,bt=0$

$\implies t(3ct-2b)=0$

$\implies t=0\text{ or }t=\dfrac{2b}{3c}$

When $t=0$ , the velocity vector is equal to the zero vector, which technically has no direction/doesn't make an angle with any other vector. So the only time this happens is for

$\boxed{t=\dfrac{2b}{3c}}$

7 0

3 years ago

HELP ME IM IN 3TH GRADE AND ONLINE SCHOOL IS POOP

snow_lady [41]

Answer:

1. evaporation

2. sublimation

3. melting

4. freezing

5. deposition

3. condensation

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3 years ago

Elsa has three metal blocks that look the same.

9966 [12]

Answer:

Aluminium is lightweight

Iron is magnetic

and one is not magnetic

4 0

3 years ago

If a person weighs 160 Newtons on Earth, what is their weight in pounds on Earth?

Levart [38]

Answer:

B. 36 lb

Explanation:

m = 160/9.8 = 16.3 kg

16.3 kg ( 2.205 lb/kg) = 36 lb

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3 years ago

In a reverse fault, the fault part that lies below the other part is called the _____.

jeyben [28]

Answer:

Explanation:

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3 years ago