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3 years ago

Devices that allow you to do work in an easier way.

Chemistry

2 answers:

IrinaVladis [17]3 years ago

6 0

Answer:

The most notable of these are known as the "six simple machines": the wheel and axle, the lever, the inclined plane, the pulley, the screw, and the wedge, although the latter three are actually just extensions or combinations of the first three.

romanna [79]3 years ago

6 0

Answer:

The most important devices that made work easier are:

The wheel

The axle

The lever

The inclined plane

The pulley

The screw

The wedge

these are known as the the "six simple machines"

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Please help

Snezhnost [94]

Relatively few hydrogen atoms

5 0

3 years ago

The density of potassium, which has the BCC structure, is 0.855 g/cm3. The atomic weight of potassium is 39.09 g/mol. Calculate

Nimfa-mama [501]

Answer:

lattice parameter = 5.3355x10^-8 cm

atomic radius = 2.3103x10^-8 cm

Explanation:

known data:

p=0.855 g/cm^3

atomic mass = 39.09 g/mol

atoms/cell = 2 atoms

Avogadro number = 6.02x10^23 atom/mol

a) the lattice parameter:

Since potassium has a cubic structure, its volume is equal to:

v = [(atoms/cell)x(atomic mass)/(p)x(Avogadro number)]

substituting values:

v =[(2)x(39.09)/(0.855x6.02x10^23)]=1.5189x10^-22 cm^3

but as the cell volume is

a^3 =v

$a=\sqrt[3]{v}=\sqrt[3]{1.5189x10^{-22} } = 5.3355x10^-8$ cm

for a BCC structure, the atomic radius is equal to

$r=\frac{ax\sqrt{3} }{4}=\frac{5.3355x10^{-8}x\sqrt{3} }{4}=2.3103x10^{-8}cm$

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3 years ago

IF RIGHT I WILL GIVE BRAINLIEST

Yuliya22 [10]

Answer:

80% clay 20% sand

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Claudia and her team of scientists develop a new car battery that recharges electric cars at a fast rate.

Doss [256]

Answer: Waste Operators will handle less hazardous material.

Explanation: Since the electric car is electric it produces hazardous material and now that it doesn't it wont.

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3 years ago

Which descriptions apply to emitted radiation? Check all that apply. measurement in Ci/Bq measurement in conventional rad or the

xxTIMURxx [149]

The correct answer is measurement in Ci/Bq, the amount of radioactive materials released into the environment, and <span>number of disintegrations of radioactive atoms in a radioactive material over a period of time. I hope this helps.</span>

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3 years ago

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Devices that allow you to do work in an easier way.​

Devices that allow you to do work in an easier way.