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USPshnik [31]
3 years ago
13

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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What current flows through a 2.56-cm-diameter rod of pure silicon that is 20.0 cm long, when 1.00 ✕ 103 V is applied to it? (Suc
vfiekz [6]

Answer:

Current, I = 0.0011 A

Explanation:

It is given that,

Diameter of rod, d = 2.56 cm

Radius of rod, r = 1.28 cm = 0.0128 m

The resistivity of the pure silicon, \rho=2300\ \Omega-m

Length of rod, l = 20 cm = 0.2 m

Voltage, V=1\times 10^3\ V

The resistivity of the rod is given by :

R=\rho\dfrac{L}{A}

R=2300\ \Omega-m\dfrac{0.2\ m}{\pi (0.0128\ m)^2}

R = 893692.30 ohms

Current flowing in the rod is calculated using Ohm's law as :

V = I R

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I=\dfrac{10^3\ V}{893692.30\ \Omega}

I = 0.0011 A

So, the current flowing in the rod is 0.0011 A. Hence, this is the required solution.

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3 years ago
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If a player through a basketball to the target with an initial velocity of 17 m/s making an angle of 30 degrees with the horizon
Svetllana [295]

Answer:

The final position made with the vertical is 2.77 m.

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Given;

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Answer:

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