EjerciciosFyQ

Mass of a volume of ethanol, expressed by pounds (4883)

F_y_Q — 2019-01-03T08:28:18Z

The density of ethanol is 0.79 g/mL. Calculate the mass, expressed in pounds, of 17.4 mL of ethanol, knowing that one pound is equal to 0.45 kg. Express the result using scientific notation.

We will solve this exercise in two steps. First, we will use the definition of density to calculate the mass of ethanol. Second, we will convert the units.

1. Calculate the mass of ethanol:

2. Convert the mass to pounds:

Mass, volume and density in International System of Units (3662)

F_y_Q — 2016-08-09T08:21:32Z

What are the units of mass and volume in SI? What will be the unit of density in SI?

In the International Sytem of Units (SI), mass must be expressed in kilograms (kg) and volume in cubic meters . Density is defined as mass per unit volume:

Therefore, its unit will be kilograms per cubic meter

Converting temperature units (3469)

F_y_Q — 2016-01-31T06:09:43Z

If my temperature is 312 K, do I have a fever?

To determine this, you need to convert the temperature from the absolute scale (Kelvin) to the Celsius scale:

Applying the formula:

As you can see, that temperature indicates a fever.

Converting heat units (3456)

F_y_Q — 2016-01-18T05:38:44Z

Convert to .

The conversion factor between calories and joules is 1 cal = 4.18 J:

Conversion of temperature units (3448)

F_y_Q — 2016-01-10T08:12:59Z

Make the following conversions of temperature units:

a) to .

b) to .

c) to .

d) to .

a)

b)

c)

d)

Convertion of force units (3441)

F_y_Q — 2016-01-03T04:58:22Z

How many newtons of force are represented by ?

Considering Newton's Second Law:

And focusing on the units, you can obtain:

As you can see, 1 newton is equal to . This means that the question is representing 3 newtons or 3 N.

Converting ounces to pounds (3433)

F_y_Q — 2015-12-25T06:26:32Z

Convert 7 678 ounces to pounds.

To convert ounces to pounds, you need to know the conversion factor between ounces and pounds. One pound is equal to 16 ounces.

Magnitudes and units: volume of a cube (3113)

F_y_Q — 2015-04-25T03:59:01Z

The structure of a chemical compound is a cube. If the length of the edge of the cube is 500 pm, what will be the volume of the cube expressed in mL?

1. Convert the length to cm:

2. Formula to calculate the volume of the cube:

Substitute the values and calculate:

Conversion of units (1930)

F_y_Q — 2012-11-08T06:23:14Z

a) The normal body temperature is . Express this value in K.

b) If an object has a temperature of 354 K, what is its temperature in Celsius?

a) The convertion formula form Celsius to Kelvin is:

b) The convertion formula from Kelvin to Celsius is: