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4 years ago

Why is salt water a better conductor of electricity than river water?

1 answer:

6 0

Answer: The conductivity of water depends on the concentration of dissolved ions in solution. ... This is because the Sodium Chloride salt dissociates into ions. Hence sea water is about a million times more conductive than fresh water.

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In the attached position versus time graph what is the magnitude of average velocity for the entire 19 seconds of the motion. An

evablogger [386]

According to the plot, the positions at time t = 0 s and t = 19 s are -1 m and -2 m, respectively. So the average velocity for the 19-s interval is

$v_{\rm ave} = \dfrac{-2\,\mathrm m - (-1\,\mathrm m)}{19\,\mathrm s} = -\dfrac1{19}\dfrac{\rm m}{\rm s}\approx \boxed{-0.05\dfrac{\rm m}{\rm s}}$

8 0

3 years ago

What conditions are required for a solar eclipse?

IgorLugansk [536]

The phase of the Moon must be new, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun.

5 0

3 years ago

How much energy is needed to heat and melt 3.0 kg of copper initially at 83°C?

Ne4ueva [31]

As we know that in order to melt the copper we need to take the temperature of copper to its melting point

So here heat required to raise the temperature of copper is given as

$Q = ms\Delta T$

We know that

melting temperature of copper = 1085 degree C

Specific heat capacity of copper = 385 J/kg C

now we have

$Q = 3(385)(1085 - 83)$

$Q = 1157310 J$

$Q = 1157.3 kJ$

now in order to melt the copper we know the heat required is

$Q = mL$

here we know that

L = 205 kJ/kg

now from above formula

$Q = 3(205) kJ$

$Q = 615 kJ$

now total heat required will be

$Q = 1157.3 kJ + 615 kJ$

$Q = 1772.3 kJ$

As we know that

$1 Cal = 4.18 kJ$

now we have

$Q = \frac{1772.3}{4.18} = 430 KCal$

6 0

3 years ago

What is a moon node? have a great day

RideAnS [48]

Answer:

lunar node in other words is either of the two orbital nodes of the Moon, that is, the two points at which the orbit of the Moon intersects the ecliptic. The ascending node is where the Moon moves into the northern ecliptic hemisphere, while the descending node is where the Moon enters the southern ecliptic hemisphere

3 0

3 years ago

Read 2 more answers

A water strider bug is supported on the surface of a pond by surface tension acting along the interface between the water and th

Alik [6]

Answer:

minimum interface length = 1.36 mm

Explanation:

given data

weight of the bug = $10^{-4}$ N

solution

we will apply here Surface Tension formula that is

Surface Tension ,σ = Force ÷ length ........................1

and we consider here surface tension for water is 7.34 × $10^{-2}$ N/m

so that here minimum interface length needed to support the bug is

minimum interface length = Force ÷ σ

minimum interface length = $10^{-4}$ ÷ 7.34 × $10^{-2}$

minimum interface length = 1.36 mm

4 0

3 years ago