3 years ago

Which is the SI base unit for mass?

Physics

2 answers:

Pavlova-9 [17]3 years ago

4 0

Answer:

kilogram

Explanation:

Sedbober [7]3 years ago

4 0

Answer:

SI base units of mass=KG

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Lead atoms occupy a volume of 3 x 10-29 m3. Each atom contributes two free electrons. Calculate the Fermi velocity of lead.

Juliette [100K]

Answer: The Fermi velocity of lead is 64.4 km/s.

Explanation:

To calculate the Fermi velocity, we use the equation:

$V_f=\frac{h}{2\pi m_e}(\frac{3\pi^2N}{V})^{1/3}$

where,

h = Planck's constant = $6.62\times 10^{-34}Js$

$m_e$ = mass of electron = $9.1\times 10^{-31}kg$

N = Number of atoms present in per volume of atom multiplied by number of electrons present in given atom = $\frac{2\times N_A\times V}{M}$

$N_A$ = Avogadro's number = $6.022\times 10^{26}mol^{-1}$ (When the mass is in kilograms)

V = Volume = $3\times 10^{-29}m^3$

M = molecular weight of lead = 207.2 g/mol

Putting values in above equation, we get:

$V_f=\frac{6.62\times 10^{-34}}{2\times 3.14\times (9.1\times 10^{-31})}(\frac{3\times (3.14)^2\times (2\times 6.022\times 10^{23}\times 3\times 10^{-29})}{3\times 10^{-29}\times 207.2})^{1/3}$

$V_f=0.0644\times 10^6m/s=64.4km/s$ (Conversion factor: 1 km = 1000 m)

Hence, the Fermi velocity of lead is 64.4 km/s

4 0

3 years ago

An aluminum bar has a mass of 9 kg in the air. Calculate its volume. Now imagine that you submerge the aluminum bar in water han

yan [13]

Answer:

55.7 N

Explanation:

The density of aluminum is 2710 kg/m³. So its volume is:

V = (9 kg) / (2710 kg/m³)

V = 0.00332 m³

The apparent weight is the actual weight minus the buoyant force.

N = mg − B

N = mg − ρVg

N = g (m − ρV)

N = (9.8 m/s²) (9 kg − (1000 kg/m³) (0.0332 m³))

N = 55.7 N

7 0

3 years ago

A current of 3.60A flows for 15.3s through a conductor. Calculate the number of electrons that pass through a point in the condu

Artyom0805 [142]

3.60 A = 3.60 coulombs of charge per second

(3.60 Coul/sec) x (15.3 sec) = 55.08 coulombs of charge

1 coulomb of charge is carried by 6.25 x 10^18 electrons

Number of electrons =

(55.08 Coul) x (6.25 x 10^18 e/coul) = 3.4425 x 10^20 electrons

7 0

4 years ago

This is a type of symbiotic relationship where both organisms benefit. A) commensalism B) competition C) mutualism D) parasitism

Verdich [7]

Mutualism is the correct answer

7 0

4 years ago

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As best you can, describe how we can tell the age of the Earth and rocks found on it.

Viktor [21]

Answer:

We can determine the age of the Earth and the rocks found on Earth with techniques such as measuring ice cores and digging and analysing fossils.

Explanation:

Hopefully this helped!

4 0

3 years ago