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nikklg [1K]
3 years ago
15

which element are you most likely to find as a free element rather than a compound lead or calcium, explain?

Physics
1 answer:
TEA [102]3 years ago
8 0
Pb, if compared to Ca it is less reactive and it is a transition metal, and is highly stable alone.
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Which is an example of reflection
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Common examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. Mirrors exhibit specular reflection.

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2 years ago
A silver wire has a cross sectional area a = 2.0 mm2. a total of 9.4 × 1018 electrons pass through the wire in 3.0 s. the conduc
marta [7]
This problem uses the relationships among current I, current density J, and drift speed vd. We are given the total of electrons that pass through the wire in t = 3s and the area A, so we use the following equation to to find vd, from J and the known electron density n, so: 

v_{d} =  \frac{J}{n\left | q \right |}

<span>The current I is any motion of charge from one region to another, so this is given by:

</span>I = \frac{\Delta Q}{\Delta t} = \frac{9.4x1018electrons}{3s} = 3189.73(A)

The magnitude of the current density is:

J = \frac{I}{A} = \frac{3189.73}{2x10^{-6}} = 1594.86(A/m^{2})

Being:

A=2mm^{2} = 2x10^{-6}m^{2}
<span>
Finally, for the drift velocity magnitude vd, we find:

</span>v_{d} = \frac{1594.86}{5.8x1028\left |1.60x10^{-19}|\right } = 1.67x10^{18}(m/s)

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6 0
2 years ago
How many molecules are there in 39 grams of water
Llana [10]

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39 g H2O contains 1.3 ×1024molecules H2O.

Explanation:

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3 years ago
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h = 187 m

Learn more about work done: brainly.com/question/13662169?

7 0
2 years ago
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