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3 years ago

3. How many elements are found naturally on the Farth? *

Physics

1 answer:

valentinak56 [21]3 years ago

6 0

Answer:

Fir wat glasss

Explanation:

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A property unique to a conducting substance that determines its resistance is called:

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Answer:

B. Resistivity

Explanation:

Resistance offered by a substance of unit area per unit length.

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3 years ago

Iron ball sinks in water but not in mercury. Why?

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Answer:

mercury is more dense

Explanation:

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3 years ago

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Generally, what will happen to most liquids if the temperature is increased?

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Temperature doesn't really affect solubility on liquids so it can only be D besides it's already a liquid....

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3 years ago

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A bungee jumper of mass m = 65 kg jumps from a bridge.

yawa3891 [41]

To solve the problem it is necessary to apply energy conservation.

By definition we know that kinetic energy is equal to potential energy, therefore

PE = KE

$mgh = \frac{1}{2}mv^2$

Where,

m = mass

g = gravitaty constat

v = velocity

h = height

Re-arrange to find h,

$h=\frac{v^2}{2g}$

Replacing with our values

$h=\frac{26^2}{2*9.8}$

$h = 34.498\approx 34.5m$

Therefore the correct answer is C.

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2 years ago

Find the total electric charge of 2.5 kg of electrons. Express your answer using two significant figures.

zimovet [89]

Answer : The total electric charge of electrons is, $-4.4\times 10^{11}C$

Explanation:

Answer : The number of electrons transferred are, $4.68\times 10^{20}$

Explanation :

First we have to calculate the number of electrons.

Number of electrons = $\frac{\text{Total mass of electrons}}{\text{Mass of one electron}}$

Mass of 1 electron = $9.1\times 10^{-31}kg$

Total mass of electron = 2.5 kg

Number of electrons = $\frac{2.5kg}{9.1\times 10^{-31}kg}$

Number of electrons = $2.75\times 10^{30}$

Now we have to calculate the total electric charge of electrons.

Formula used :

$Q=ne\\\\n=\frac{Q}{e}$

where,

n = number of electrons transferred = $2.75\times 10^{30}$

Q = charge on electrons = ?

e = charge on 1 electron = $-1.602\times 10^{-19}C$

Now put all the given values in the above formula, we get:

$2.75\times 10^{30}=\frac{Q}{-1.602\times 10^{-19}C}$

$Q=-4.4\times 10^{11}C$

Thus, the total electric charge of electrons is, $-4.4\times 10^{11}C$

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3 years ago