PHYSICS MIDDLE SCHOOL

A graduated cylinder is filled to an initial volume of 12.7 ml. A rock Is dropped into the graduated cylinder. The final volume of the graduated cylinder is 18.2ml. What is the Rocks volume in both ml and cm3? What method was used to determine this?

Answers

Answer 1

Answer:

Answer:

V = 5.5 mL

Explanation:

The volume filled in the graduated cylinder is 12.7 mL

now when a stone is dropped into the cylinder then the volume of liquid is raised to final level of 18.2 mL

so as per the theory of given by Archimidies we can say that the volume of the object is exactly same as the volume displaced by the object

So here the volume displaced by the object is given as

$V_(displaced) = V_f - V_i$

$V_(displaced) = 18.2 mL - 12.7 mL$

$V_(displaced) = 5.5 mL$

so the volume of the object is given as

$V = V_(displaced)$

$V = 5.5 mL$

Answer 2

Answer: First of all, ml and cm^3 are equal. The volume of the rock is 5.5 ml. This is found by subtracting the volume of just the water from the combined volume of the rock and the water leaving you with just the volume of the rock. This is method is using water displacement.

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If light intensity obeyed an inverse square law you would expect to find the intensity of light to decrease as the square of the distance increases? True or false

Answers

Inverse square law: $(I_(2) )/(I_(1))= (\frac{d{2} }{d_(1)})^2$
where
$I_(1)$ is the intensity at distance 1
$I_(2)$ is the intensity at distance 2
$d_(1)$ is distance 1
$d_(2)$ is distance 2

The inverse squared law state that intensity decreases in inverse proportion to the distance squared. So if light obeyed that rule, it will decreases its intensity as the square of the distance increases.

We can conclude that the correct answer is: true.

this is a true statement

What is the difference between chemical change and a physical change?

Answers

Answer:

chemical change through chemical process .

physical change means change in dimension.

Final answer:

A chemical change involves a change in the substance's composition, creating new substances with different properties, typically through reactions such as rusting or combustion. In contrast, a physical change alters a substance's form without affecting its composition, as in melting or condensation processes. The processes can also be classified as exothermic (releasing heat) or endothermic (absorbing heat).

Explanation:

The difference between a chemical change and a physical change pertains to the composition of the substance in question. A chemical change always results in the production of a new substance with different properties from the original matter. For example, the formation of rust from iron, or the combustion process in burning, are chemical changes. These result in the creation of substances distinct from the original matter.

On the other hand, physical changes do not affect the composition of the substance, but alter its state or form, such as the melting of ice into water or the condensation of steam into liquid water. These changes, while observable, do not produce new substances, hence maintaining the original properties of the matter.

Physical and chemical changes can also be differentiated based on whether they release or absorb heat, with exothermic processes releasing heat and endothermic processes absorbing heat. For example, the burning of a fuel is an exothermic process, while the operation of a cold pack is an endothermic process.

Learn more about Chemical vs Physical Change here:

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A circuit has a known resistance of 5 Ohms. An ammeter in the circuit gives a reading of 5 Amps. What is the Voltage of the circuit?

Answers

E = I R

Voltage = (current)×(resistance).

V = 5A x 5 ohms = 25 volts.

The speedometer in a car gives gives the car's ____ speed

Answers

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Oxidation in a sentence

Answers

Oxidation is the loss of electrons.

Which scientific principle states that specific groups of organisms have followed, or succeeded, one another in a definite sequence through Earth history? A.
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B.
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C.
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D.
geological succession

Answers

I think the answer is D. Geological succession.

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