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4 years ago

If told to determine whether or an unknown substance is either salt or sugar what do you do to determine which it is explain?

1 answer:

3 0

If you were allowed to taste it sugar will be more sweeter whereas salt wouldnt. But if you were to touch it then sugar is more tinnier than salt.

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The block in this illustration is floating in water, which has a density of 1.00 g/cm3 .What is a good estimate of the density o

miss Akunina [59]

Answer : The density of the block is estimated to be, $0.30g/cm^3$ .

Explanation :

Density of the water, $\rho_w=1.0 g/cm^3$

As we know that,

Buoyant force = $\rho\times volume\times g$

where,

g = gravitational acceleration

volume of the block = v

density of the block = $\rho_o$

Weight of the Block = Buoyant force exerted by water

$\rho_o\times v\times g=\rho_w\times 30\%\text{ of volume of block}\times g$

$\rho_o\times v\times g=\rho_w\times 0.30v\times g$

$\rho_o\times v\times 9.8 m/s^2=1 g/cm^3\times 0.30v\times 9.8 m/s^2$

$\rho_o=0.30 g/cm^3$

Thus, the density of the block is estimated to be, $0.30g/cm^3$ .

6 0

3 years ago

The first five questions refer to the following problem:

MariettaO [177]

The Acceleration of a model rocket = 4 m/s²

<h3>Further explanation </h3>

Newton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object

∑F = m. a

$\large{\boxed{\bold{a=\frac{\sum F}{m}}}$

F = force, N

m = mass = kg

a = acceleration due to gravity, m / s²

An upward thrust of 35 N

A model rocket has a mass of 2.5 kg(weight = 25 N)

so resultant force :

$\tt \sum F=F~upward~thrust-F~weight\\\\\sum F=35-25\\\\\sum F=10~N$

The acceleration :

$\tt a=\dfrac{\sum F}{m}\\\\a=\dfrac{10}{2.5}\\\\a=4~m/s^2$

3 0

3 years ago

Explain how thermal energy is transferred in convection.

Tpy6a [65]

Answer:

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection. Liquids and gases expand when they are heated. ... As a result, the particles take up more volume.

4 0

3 years ago

Why nucleus of an atom is negatively charged?

Igoryamba

Answer:

An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. ... The nucleus of an atom contains protons and neutrons

Explanation:

5 0

3 years ago

k0ka [10]

Answer:

Chemical reactions takes place

Explanation:

Chemical energy stored in bonds of chemical compound are released when chemical reactions takes place.

Chemical energy is a form of potential energy that is found in chemical bonds.

When chemical reactions occur, bonds are broken and formed again.
The process of breaking and forming new bonds releases chemical energy.
In this manner most chemical reactions are often accompanied by energy changes
The energy changes is due to the formation of new bonds.

7 0

3 years ago