Physics, 01.07.2019 23:50 maddylucas

Explain the law of conservation of mass. when wood burns, it releases heat and turns into ashes. when the ashes are weighed, they are significantly lower than that of the wood. how is this possible in terms of the law of conservation of mass?

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Well, you'd probably heard about the 3 state of matter wh9ch are obviously gas, liquid and solid . The thing is when the wood was burned it was a chemical change , meaning it changes into something new or something else . For instance in this case wood changed to ashes probably some part of it changed to gas , so if we are weigh the ashes and the gas it will give you the initial weight of the wood

Answer from: Quest

Iwould sure like to answer your question but i honestly just don’t know

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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Explain the law of conservation of mass. when wood burns, it releases heat and turns into ashes. whe...

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