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2 years ago

15

Describe an experiment that can be used to determine the resistance of a metallic conductor

1 answer:

raketka [301]2 years ago

7 0

Answer:

resistance of the metal conductor at different temperature

Explanation:

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Joseph is sitting in the family van. His mother is driving him from their house to the library. Joseph waves as he passes his fr

zubka84 [21]

I think it is maria but i am more sure than wondering

4 0

3 years ago

A falling object is said to reach a constant velocity (terminal velocity)..

Lana71 [14]

C

Terminal velocity is the maximum velocity attainable by an object as it falls through a fluid (air is the most common example). It occurs when the sum of the drag force (Fd) and the buoyancy is equal to the downward force of gravity (FG) acting on the object.(Wikipedia)

3 0

3 years ago

A spherical balloon is made from a material whose mass is 3.00 kg. The thickness of the material is negligible compared to the 1

vesna_86 [32]

To solve the problem it is necessary to apply the definition of Newton's second Law and the definition of density.

Density means the relationship between volume and mass:

$\rho = \frac{m}{V}$

While Newton's second law expresses that force is given by

F = ma

Where,

m = mass

a= acceleration (gravity at this case)

In the case of the given data we have to,

$m_b = 3Kg$

$r = 1.5m\\V = \frac{4}{3}\pi r^3 \\V = \frac{4}{3} \pi 1.5^3\\V = 14.13m^3$

In equilibrium, the entire system is equal to zero, therefore

$\sum F = 0$

$F_g +F_h-F_b = 0$

Where,

$F_g =$ Weight of balloon

$F_h =$ Weight of helium gas

$F_b =$ Bouyant force

Then we have,

$mg+V\rho g -V\rho_a g = 0$

$\rho = \rho_0-\frac{m}{V}$

Replacing the values we have that

$\rho = 1.19kg/m^3 -\frac{3Kg}{14.13m^3}$

$\rho = 0.978kg/m^3$

Now by ideal gas law we have that

$PV=nRT$

$P\frac{\rho}{m} = nRT$

$P = \rho \frac{n}{m}RT$

But the relation \frac{n}{m} is equal to the inverse of molar mass, that is

$P = \frac{\rho}{M_0} RT$

$P = \frac{0.978kg/m^3}{0.04kg/mol}*8.314J/K.Mol * 305K$

$P = 619995.7Pa$

Therefore the pressure of the helium gas assuming it is ideal is 0.61Mpa

5 0

3 years ago

DaniilM [7]

Explanation:

F = m a

F= 4.0×4.0

F= 16 N

......................................................................................................

F= ma

25= m × 4.998

m= 25/4.998

m= 5.002 kg

......................................................................................................

F=ma

53= 3 × a

a= 53/3

a= 17.666 m/s

5 0

3 years ago

What is the source of all mechanical waves?

igor_vitrenko [27]

The answer is vibration

6 0

3 years ago

Read 2 more answers