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2 years ago

What is the SI unit of pressure? A. g/cm3 B. the pascal C. the newton D. m/s2

Physics

2 answers:

sesenic [268]2 years ago

6 0

The basic definition of pressure is force/area and the scientific community defined that as the Pascal (Pa).

Mekhanik [1.2K]2 years ago

5 0

N/m2 ............. may also be the answer youre looking for

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Slick and smooth surfaces mediate friction to a low, allowing an object to speed across it with low resistance.

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2 years ago

How do we find work from a force-displacement graph when the force exerted<br> is not constant?

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Answer:

Explanation:

Read forces directly from the graph.

Read displacements directly from the graph.

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2 years ago

A girl is bouncing on a trampoline where is her gravitational potential energy a maximum and where is her kinetic energy maximum

Stella [2.4K]

Answer:

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2 years ago

An expensive vacuum system can achieve a pressure as low as 1.00×10^{-7} N/m^2 at 20ºC . How many atoms are there in a cubic cen

marta [7]

Answer:

$24.70818432141\times 10^7\ atoms$

Explanation:

P = Pressure = $1\times 10^{-7}\ N/m^2$

V = Volume = 1 cm³

n = Amount of substance

N = Number of atoms

$N_A$ = Avogadro's constant = $6.022\times 10^{23}\ /mol$

R = Gas constant = 8.314 J/k mol

T = Temperature = 273.15+20 = 293.15 K

From the ideal gas law

$PV=nRT\\\Rightarrow n=\frac{PV}{RT}$

$n=\frac{N}{N_A}$

$\frac{N}{N_A}=\frac{PV}{RT}\\\Rightarrow N=N_A\times \frac{PV}{RT}\\\Rightarrow N=\frac{1\times 10^{-7}\times 1\times 10^{-6}}{8.314\times 293.15}\times 6.022\times 10^{23}\\\Rightarrow N=24708184.32141\ atoms=24.70818432141\times 10^7\ atoms$

The number of atoms is $24.70818432141\times 10^7\ atoms$

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2 years ago

4. Suppose the observed motion of a moving airplane, illustrated by a distance vs. time graph, is nearly a straight line with ze

jekas [21]

It shows that the airplane covers equal distance in equal time interval, that's it has a straight line from the origin.

The plane is moving at uniform speed.

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2 years ago