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4 years ago

Approximately how much of Earth’s water is freshwater?

Physics

2 answers:

marishachu [46]4 years ago

8 0

50% water is fresh into Earth

wolverine [178]4 years ago

5 0

It's like 2.5 percent. That's closer to 3 so go with that.

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In a material for which o=5.0 S/m and e, =1 the electric field intensity is E- 250 sin 10" (V/m). Find the conduction and displa

Elodia [21]

Answer:

Explanation:

Given that:

The conductivity of the material $\sigma$ = 5.0 s/m

$The \ relative \ permittivity \ of \ the \ material$ ${\varepsilon_r} = 1$ ; &

The electric field intensity of the material E = 250 sin(10¹⁰ t) V/m

(a) The conduction current density $( J_c) = \sigma E$

$= 5.0 \times 250 \ sin ( 10^{10} \ t )$

$\mathbf{ = 1250 \ sin (10 ^{10} t ) \ A/m^2 }$

(b) Displacement current density $(J_d) = \varepsilon _d * \dfrac{\delta E}{\delta t}$

Recall that:

$\varepsilon _o = 8.854 \times 10^{-12}$

∴

$(J_d) = 8.854 \times 10^{-12} \times \dfrac{d}{dt} \times (250 \ sin \ (10^{10} \ t))$

$(J_d) = 8.854 \times 10^{-12} \times 250 \times 10^{10} \times \ cos \ (10^{10} \ t)$

$(J_d) = 22.135 \ cos \ 10^{10} \ t \ A/m^2$

$f = \dfrac{\sigma}{2 \pi \varepsilon_o \varepsilon_r}$

By substitution

$f = 18 \times 10^9 \times \dfrac{\sigma }{\varepsilon_r}$

$f = 18\times 10^9 \times \dfrac{5}{1 }$

f = 90 GHz

5 0

3 years ago

A 12 v battery is connected across two parallel metal plates separated by 0.30 cm. find the magnitude of the electric field.

jolli1 [7]

The electric field between two parallel metal plates is given by
$E= \frac{V}{d}$
where
E is the electric field
V is the voltage across the two plates
d is the separation between the two plates.

In our problem, the voltage is $V=12 V$ while the separation between the plates is $d=0.30 cm=0.003 m$ , therefore the magnitude of the electric field is
$E= \frac{V}{d}= \frac{12 V}{0.003 m}=4000 V/m$

3 0

3 years ago

In a science demonstration, a teacher mixed zinc (Zn) with hydrogen chloride (HCl) in a flask and quickly attached a balloon ove

Juliette [100K]

Answer:

Combustion reaction resulted in formation of Hydrogen gas.

Explanation:

When zinc and Hydrogen Chloride (HCl) are mixed together, it is a oxidation reduction process. To be specific, a combustion reaction takes place. It is an exothermic reaction. Exothermic reactions involve oxygen and generate . Here, due to this exothermic reaction, Hydrogen gas is being produced which results in the formation of bubble and inflation of balloon.

6 0

3 years ago

Read 2 more answers

The acceleration of The Munster’s car is 9.71 m/s2 when he applies 5050 N of net force (by way of the engine). What is the mass

Ainat [17]

Given that,

Acceleration, a = 9.71 m/s²

Force, F = 5050 N

mass, m = ?

Since, we know that

F=ma

m= F/a

m= 5050/9.71

m= 520.08 kg

The mass of hi car is 520.08 kilograms.

4 0

3 years ago

A ball rolls horizontally off an incline, at velocity of 8.00m/s l. If the incline is 3.50m above the ground below determine:

Nesterboy [21]

Answer:

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3 years ago