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3 years ago

What are some examples of uses of minerals? Select 3 choices.

Physics

2 answers:

julia-pushkina [17]3 years ago

5 0

Answer:

salt, toothpaste, and applesauce

Explanation:

All of these have minerals in them. Hope this helps! :)

never [62]3 years ago

4 0

I would also agree ^^^

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Bricks and insulation are used to construct the walls of a house. The

ira [324]

Answer:

$\dot Q=350.438\ W$

Explanation:

Given:

<u>the thermal resistance in the form of </u>

$R_1=\frac{x_1}{k_1} =0.095\ m^2.^{\circ}C.W^{-1}$

$R_2=\frac{x_2}{k_2} =0.704\ m^2.^{\circ}C.W^{-1}$

where:

$x_1\ \&\ x_2$ are the thickness of the respective bricks

$k_1\ \&\ k_2$ are the respective coefficient of conductivity

temperature inside the house, $T_h=24\ ^{\circ}C$

temperature outside the house, $\ T_c=10^{\circ}C$

area of the wall, $A=20\ m^2$

Since the bricks and insulation are used to construct a wall then they must be used in series for better shielding.

<u>Using Fourier's law:</u>

$\dot Q=k.A.\frac{dT}{x}$

$\dot Q={dT}\div {\frac{x}{k.A} }$

in series the resistances get add up

$\dot Q=dT\div (\frac{x_1}{k_1.A}+\frac{x_2}{k_2.A} )$

$\dot Q=(24-10)\div (\frac{0.095 }{20}+ \frac{0.704 }{20} )$

$\dot Q=350.438\ W$

7 0

4 years ago

Thermal energy is transferred between objects when they have?

Oliga [24]

The answer is B I had to answer this question one time

8 0

2 years ago

Read 2 more answers

The neurons of giant squids, for example, consist of axons with very large radii, which allows the squid to react very quickly w

Alinara [238K]

Answer:

100

Explanation:

$\rho_m$ = Resistivity of axon

r = Radius of axon

t = Thickness of the membrane

$\rho_a$ = Resistivity of the axoplasm

Speed of pulse is given by

$v=\sqrt{\dfrac{\rho_mrt}{2\rho_a}}$

So, radius is given by

$r=\dfrac{2\rho_a}{\rho_mt}v^2$

If radius is increased by a factor of 10 new radius will be

$r_2=\dfrac{2\rho_a}{\rho_mt}(10v)^2\\\Rightarrow r_2=100\dfrac{2\rho_a}{\rho_mt}v^2\\\Rightarrow r_2=100r$

So, The radius will increase by a factor of 100.

5 0

4 years ago

(BRAINLIEST)

UkoKoshka [18]

Answer:

Gravity

because it's factorised by mass of a body.

For other forces, they deal with charges of negligible mass and weights

4 0

3 years ago

Read 2 more answers

What is the reaction force of the table with a weight of 558N

Delicious77 [7]

Answer: reaction force = -558N

Explanation:

w = f = 558N

since action force and reaction force are equal in magnitude and opposite in direction,

reaction force = -(f)

reaction force = -558N

if that helps.

8 0

3 years ago