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3 years ago

What is resistivity?

Physics

1 answer:

Rom4ik [11]3 years ago

3 0

Answer:

Resistivity, electrical resistance of a conductor of unit cross-sectional area and unit length.

Explanation:

A characteristic property of each material, resistivity is useful in comparing various materials on the basis of their ability to conduct electric currents. High resistivity designates poor conductors.

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In an engine, an almost ideal gas is compressed adiabatically to half its volume. In doing so, 1850 J of work is done on the gas

hammer [34]

Answer:

The value of change in internal energy of the gas = + 1850 J

Explanation:

Work done on the gas (W) = - 1850 J

Negative sign is due to work done on the system.

From the first law we know that Q = Δ U + W ------------- (1)

Where Q = Heat transfer to the gas

Δ U = Change in internal energy of the gas

W = work done on the gas

Since it is adiabatic compression of the gas so heat transfer to the gas is zero.

⇒ Q = 0

So from equation (1)

⇒ Δ U = - W ----------------- (2)

⇒ W = - 1850 J (Given)

⇒ Δ U = - (- 1850)

⇒ Δ U = + 1850 J

This is the value of change in internal energy of the gas.

7 0

3 years ago

Which items are matter?

Mumz [18]

Without being provided a list of items, I would have to generally say that everything around you is matter. There are a few exceptions to this list, but a general rule of thumb is anything you can touch, taste, smell or hold would be considered matter. Sound, light, time (Dr. Who may disagree) and heat would be considered non-matter items.

3 0

3 years ago

A 5.0 kg box is sliding across a waxed floor by the application of a 15 N east force. If the force of friction is 2.5 N west, wh

coldgirl [10]

1) 12.5 N east

There are two forces acting on the box along the horizontal direction:

- The applied force of 15 N east, we indicate it with F

- The force of friction of 2.5 N west, we indicate it with $F_f$

Taking east as positive direction, we can write the two forces has

$F=+15 N\\F_f = -2.5 N$

Therefore, the net force on the box will be:

$F_{net} = F + F_f = 15 + (-2.5) = +12.5 N$

And the positive sign means the direction is east.

2) $2.5 m/s^2$

We can solve this part by using Newton's second law:

$F_{net}=ma$

where

$F_{net}$ is the net force on the box

m is its mass

a is the acceleration

For the box in this problem,

$F_{net} = 12.5 m/s^2$ (east)

m = 5.0 kg

Solving for a, we find the acceleration:

$a=\frac{F_{net}}{m}=\frac{12.5}{5.0}=2.5 m/s^2$

And the direction is the same as the net force (east)

6 0

3 years ago

A piston uses 32 J of energy to do work as 68 J of heat are added to the cylinder of the piston. The change in internal energy o

enyata [817]

Internal energy is defined as the energy associated with the random, disordered motion of molecules. It is denoted by U and calculated by the expression:

ΔU = Q - W

We calculate as follows:

ΔU = 68 J - 32 J
ΔU = 36 J

3 0

3 years ago

Read 2 more answers

What is the change in air pressure a good indicator of a change in temperature be a change in the weather I decrease in humidity

Elza [17]

Answer:

Explanation:

warm air rises creating low presure

cold air sinks creating high presure

so this means that temprature is realated to presure.

3 0

3 years ago

What is resistivity?​

What is resistivity?