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3 years ago

What is the relationship between the electric force and each one of the charges?

1 answer:

3 0

Explanation: Electrostatic force is directly related to the charge of each object. So if the charge of one object is doubled, then the force will become two times greater.

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Learning Goal: To review the concept of conservative forces and to understand that electrostatic forces are, in fact, conservati

CaHeK987 [17]

Explanation:

The electrostatic forces are conservative forces!

The mainly property of the conservative fields is $\vec{\nabla} \times \vec E=\vec 0$

In spherical coordinates the field's expression is:

$\vec E=\frac{Q}{4\pi \epsilon _0 r^2} .\^r$

and the curl expression is:

$\nabla\times \vec E=\frac{1}{r^2{\sin}\,\theta}\left|\begin{matrix}\hat{r} & r\,\hat{\theta} & r\,{\sin}\,\theta\,\hat{\varphi} \\& & \\\frac{\partial}{\partial r} & \frac{\partial}{\partial \theta} & \frac{\partial}{\partial \varphi}\\ & & \\E_r & rE_\theta & r{\sin}\,\theta\, E_\varphi\end{matrix}\right|=(0, 0, 0)$

to find the expression for the potential function associated:

$\vec E=\vec \nabla . V, \Delta V= V_b-V_a=-\int _c \vec E.d\vec l=-\int _c E\^r.dr\^r=-\int _c Edr=\int \limits^a_b \frac{Q}{4\pi \epsilon _0 r^2} dr= \frac{Q}{4\pi \epsilon _0}.(\frac{1}{r}|^b_a)= \frac{Q}{4\pi \epsilon _0}.(\frac{1}{b}-\frac{1}{a})$

5 0

3 years ago

For a birthday gift, you and some friends take a hot-air balloon ride. One friend is late, so the balloon floats a couple of fee

LuckyWell [14K]

Answer:60 kg

Explanation:

Given

mass of people =1140 kg

and balloon is neutral when 1140 kg is loaded in the balloon .

when another person come balloon started descending at the rate of 0.49 $m/s^2$

For initial condition

$F_b=mg$

$F_b=1140\times 9.8=11.172 KN$

For second case

$(1140+m)\times 9.8-F_b=(1140+m)\times 0.49$

$(1140+m)\times (9.8-0.49)=11.172 \times 10^3$

$1140+m=1200$

$m=60 kg$

5 0

3 years ago

a test tube has a diameter of 3cm . how many turns would a piece of thread of length 90.42 make round test tube

nadya68 [22]

Answer:

4.8 turns would be made around the tube

Explanation:

You need the circumference of the tube since it's just a lifted circle

2×pi×3=18.85

90.42/18.85=4.79

And round that to 4.8

6 0

3 years ago

Why is upthrust directly proportinal to acceleration due to gravity

kati45 [8]

Answer:The force of buoyancy equals density of liquid times acceleration due to gravity times volume of liquid replaced. So buoyancy is directly proportional to gravity, and you would float just as well in 5G as 1G. ... A simpler way to look at it is: you float because gravity attracts water more than it attracts your body.

Explanation: i dont know if this helps i hope it does have a nice day.

4 0

3 years ago

Mechanical waves are classified according to

eimsori [14]

Answer:

Mechanical waves are classified by how they move.

Explanation:

3 0

3 years ago