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3 years ago

A pond changes into a field through the process of

2 answers:

8 0

Evaporation because the water from the pond will evaporate and transform into a field. To evaporate is when water molecules go up and there is no more water.

strojnjashka [21]3 years ago

4 0

The process of evaporation

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A 20 cm-radius ball is uniformly charged to 71 nC.

artcher [175]

Answer:

Part a)

$\rho = 2.12\mu C/m^3$

Part b)

$q_1 = 1.11 nC$

$q_2 = 8.88 nC$

$q_3 = 71 nC$

Part c)

$E_1 = 3996 N/C$

$E_2 = 7992 N/C$

$E_3 = 15975 N/C$

Explanation:

Part a)

As we know that charge density is the ratio of total charge and total volume

So here the volume of the charge ball is given as

$V = \frac{4}{3}\pi R^3$

$V = \frac{4}{3}\pi(0.20)^3$

$V = 0.0335 m^3$

now the charge density of the ball is given as

$\rho = \frac{71 nC}{0.0335} = 2.12\mu C/m^3$

Part b)

Now the charge enclosed by the surface is given as

$q = \rho V$

at radius of 5 cm

$q = (2.12 \mu C/m^3)(\frac{4}{3}\pi(0.05)^3$

$q = 1.11 nC$

at radius of 10 cm

$q = (2.12 \mu C/m^3)(\frac{4}{3}\pi(0.10)^3$

$q = 8.88 nC$

at radius of 20 cm

$q = 71 nC$

Part c)

As we know that electric field is given as

$E = \frac{kq}{r^2}$

so we have electric field at r = 5 cm

$E_1 = \frac{(9\times 10^9)(1.11 nC)}{0.05^2}$

$E_1 = 3996 N/C$

electric field at r = 10 cm

$E_2 = \frac{(9\times 10^9)(8.88 nC)}{0.10^2}$

$E_2 = 7992 N/C$

electric field at r = 20 cm

$E_3 = \frac{(9\times 10^9)(71 nC)}{0.20^2}$

$E_3 = 15975 N/C$

3 0

2 years ago

Smoking and your health help!!!!

Luden [163]

Ill give you 7-12. 7.f 8.e 9. b 10.c 11.d 12. a

4 0

3 years ago

An object is lifted upward at a constant speed. The gain in potential energy of the object is due to the

Ann [662]

Answer:

Explanation:

7 0

2 years ago

A fisherman sees his boat moving up and down, owing to waves on the water. It takes 2.5 s for the boat to travel from its highes

nata0808 [166]

Answer:

The waves are traveling in a speed of

v=1.20 m/s

Explanation:

The fisherman see a wave at 6m apart so that's the wavelength

$L=6m$

Now the period is the time between two successive waves so

$t=2*2.5s=5s$

The velocity of the waves is describe by:

$v=f*L$

$f=\frac{1}{t}=\frac{1}{5s}=20s^{-1}$

$v=0.20s^{-1}*6m$

$v=1.20 \frac{m}{s}$

7 0

3 years ago

A soccer ball is kicked from the top of one building with a height of H1 = 30.2 m to another building with a height of H2 = 12.0

salantis [7]

The amount of energy lost to air friction, given the data is 37.71 J

<h3>How to obtain the initial energy</h3>

Initial velocity (u) = 15.1 m/s
Mass (m) = 450 g = 450 / 1000 = 0.45 Kg
Initial Energy (E₁) = ?

E₁ = ½mu²

E₁ = ½ × 0.45 × 15.1²

E₁ = 51.3 J

<h3>How to obtain the final energy</h3>

Final velocity (u) = 19.89 m/s
Mass (m) = 450 g = 450 / 1000 = 0.45 Kg
Final Energy (E₂) = ?

E₂ = ½mv²

E₂ = ½ × 0.45 × 19.89²

E₂ = 89.01 J

<h3>How to determine the energy lost</h3>

Initial Energy (E₁) = 51.3 J
Final Energy (E₂) = 89.01 J
Energy lost =?

Energy lost = E₂ - E₁

Energy lost = 89.01 - 51.3

Energy lost = 37.71 J

Learn more about energy:

brainly.com/question/10703928

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8 0

1 year ago