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4 years ago

5

When solid surfaces slide over each other, the kind of friction that occurs is called sliding friction.

1 answer:

LekaFEV [45]4 years ago

6 0

Answer:

True

Explanation:

A sled sliding across snow or ice. Skis sliding against snow. A person sliding down a slide is an example of sliding friction. A coaster sliding against a table. Two cards in a deck sliding against each other. All of these are examples of sliding friction.

Hope this helps! :)

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The mass of a copper atom is 1.06 10-25 kg, and the density of copper is 8 920 kg/m3 . (a) determine the number of atoms in 1 cm

Andreyy89

Mass of copper atom is $1.06\times 10^{-25}kg$ and density of copper atom is $8920 kg/m^{3}$ .

First calculate the volume from density and mass as follows:

$V=\frac{m}{d}=\frac{1.06\times 10^{-25} kg}{8920 kg/m^{3}}=1.188\times 10^{-29}m^{3}$

Now, convert $m^{3}$ to $cm^{3}$ ,

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Thus,

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or,

m=8.92 g

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$n=\frac{m}{M}=\frac{8.92 g}{63.54 g/mol}=0.1403 mol$

Now, in 1 mol of Cu there are $6.023\times 10^{23}$ atoms, number of atoms in 0.1403 mol will be:

$N=0.1403\times 6.023\times 10^{23}=8.45\times 10^{22} atoms$

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