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4 years ago

(PLEASE HELP) Georgia dropped a glass in the kitchen and it shattered. What happened?

Physics

2 answers:

Orlov [11]4 years ago

5 0

Answer: physical change

Explanation: if you break glass it is still glass it did not change to another substance so it is just a physical change.

liubo4ka [24]4 years ago

5 0

Answer:

A physical change

Explanation:

This is a chemical change because, the glass only changed in its form, not its composition. The glass is glass but in a form a shattered pieces of glass. This is not a chemical change because the glass did not change in its composition; this is not a chemical reaction because no other substance caused the glass to break. And, this is not the destruction of matter because matter cannot be destroyed.

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3 years ago

Read 2 more answers

The temperature of air changes from 0 to 10°C while its velocity changes from zero to a final velocity, and its elevation change

aliya0001 [1]

Answer:

Final velocity = 119.83 m/s

Final elevation = 731.9 m

Explanation:

We are told that temperature of air changes from 0 to 10°C

Thus;

Change in temperature; ΔT = 10 - 0 = 10°C

Also, its velocity changes from zero to a final velocity. Thus;

v1 = 0 m/s

v2 is unknown

Also, its elevation changes from zero to a final elevation.

So, z1 = 0 and z2 is unknown

Now, we want to find v2 and z2 when the internal, kinetic and potential energy are equal.

Thus Equating the formula for both kinetic and internal energy gives;

½m(v2² - v1²) = mc_v•ΔT

m will cancel out and v1 is zero to give;

v2² = 2c_v•ΔT

v2 = √(2c_v•ΔT)

Where c_v is specific heat of constant volume of air with a constant value of 718 J/Kg.K

Thus;

v2 = √(2 × 718 × 10)

v2 = √14360

v2 = 119.83 m/s

To find z2, we will equate potential energy formula to that of the internal energy.

Thus;

mg(z2 - z1) = mc_v•ΔT

m will cancel out and since z1 is zero, then we have;

z2 = (c_v•ΔT)/g

z2 = 718 × 10/9.81

z2 = 731.9 m

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