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2 years ago

Which of the following is not a fluid?

Physics

2 answers:

Alinara [238K]2 years ago

4 0

The choices are confusing. Air, oil, and alcohol are fluids at any reasonable temperature. Dry cement is not.

Amanda [17]2 years ago

4 0

Answer:

Dry cement

Explanation:

Matter can be in three different states: solids, liquids or gases. Liquids or gases are also called 'fluids'. The main difference between solids and fluids is:

- in solids, the molecules are bond together, and so they cannot move freely inside the substance, but they can only vibrate around their position. For this reason, solids have a well-defined shape and they occupy a well-defined volume.

- in fluids, the molecules are NOT bond together, and so they are free to move. For this reason, fluids do not have a well defined shape or volume, but they tend to occupy the volume of their conteiner.

Among the choices given, we see that air, oil and alcohol respect the conditions listed for fluids, so they are fluids; on the contrary, dry cement respects the conditions listed for solids, so it is a solid.

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ASAPP PLS HELP MEE

Anastasy [175]

Answer:

B) 2.7 g of aluminium has a volume of 1 cm^3

Explanation:

Density can be defined as mass all over the volume of an object.

Simply stated, density is mass per unit volume of an object.

Mathematically, density is given by the equation;

$Density = \frac{mass}{volume}$

If the density of aluminum is 2.7 g/cm³, it simply means that 2.7 g of aluminium has a volume of 1 cm³

Check:

Given the following data;

Mass = 2.7 grams

Volume = 1 cm³

Substituting into the formula, we have;

$Density = \frac{2.7}{1}$

Density = 2.7 g/cm³

7 0

2 years ago

A car starts from rest and accelerates uniformly over a time of 18 seconds for a distance of 390 m. Determine the acceleration o

Sergeeva-Olga [200]

Answer:

$a=2.4\ m/s^2$

Explanation:

Given that,

The initial speed of a car, u = 0

Time, t = 18 s

Distance, d = 390 m

We need to find the acceleration of the car. Let it is a. Using the second equation of motion to find it.

$d=ut+\dfrac{1}{2}at^2$

$d=\dfrac{1}{2}at^2\\\\a=\dfrac{2d}{t^2}\\\\a=\dfrac{2\times 390}{(18)^2}\\\\a=2.4\ m/s^2$

So, the acceleration of the car is $2.4\ m/s^2$ .

5 0

2 years ago

Determine the change in velocity of a car that starts at rest and has a final velocity of 20 miles per second North

Katen [24]

Answer: The change in velocity is 20mph

Explanation: The change in velocity is the difference between the final velocity and the initial velocity.

The initial velocity is 0 and the final velocity is 20mph.

Using the formula dV=Vf-Vi

dV=20-0

dV=20mph North

5 0

3 years ago

Which of the following must be true about the object labeled X in the circuit below?

Alex787 [66]

the answer is c and if I help you thank me

4 0

2 years ago

A cylindrical wire has a length of 2.80 m and a radius of 1.03 mm. It carries a current of current of 1.35 A, when a a voltage o

aleksley [76]

Answer:

0.023 Ohms

Explanation:

Given data

Length= 2.8m

radius= 1.03mm

current I= 1.35 A

voltage V= 0.032V

We know that from Ohm's law

V= IR

Now R= V/I

Substitute

R= 0.032/1.35

R= 0.023 Ohms

Hence the resistance is 0.023 Ohms

5 0

2 years ago