True or false A physical change occurs when matter changes state as from a liquid to a gas Becuase

Physics

2 answers:

Alina [70]3 years ago

7 0

The answer will be false

Luden [163]3 years ago

6 0

False.

During chemical changes, atoms are rearranged and different kids of matter form. Liquids and gases are not solid, solid is a whole other phase. It cannot be a physical change, because it would have to involve a solid. An example of a physical change is ice melting. This would not be a physical change, but it would qualify as a chemical change.

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An object of mass 2.0 kg is attached to the top of a vertical spring that is anchored to the floor. The unstressed length of the

poizon [28]

Answer:

The value is $A = 0.014 \ m$

Explanation:

From the question we are told that

The mass of the object is $m = 2.0 \ kg$

The unstressed length of the string is $l = 0.08 \ m$

The length of the spring when it is at equilibrium is $l_e = 5.9 \ cm = 0.059 \ m$

The initial speed (maximum speed)of the spring when given a downward blow $v = 0.30 \ m/s$

Generally the maximum speed of the spring is mathematically represented as

$u = A * w$

Here A is maximum height above the floor (i.e the maximum amplitude)

and $w$ is the angular frequency which is mathematically represented as

$w = \sqrt{\frac{k}{m} }$

$u = A * \sqrt{\frac{k}{m} }$

=> $A = u * \sqrt{\frac{m}{k} }$

Gnerally the length of the compression(Here an assumption that the spring was compressed to the ground by the hammer is made) by the hammer is mathematically represented as

$b = l -l_e$