3 years ago

Is the melting of an ice cube considered a physical change or a chemical change? Explain your reasoning.

Physics

1 answer:

Kisachek [45]3 years ago

8 0

The melting of an ice cube is considered a physical change.

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4 years ago

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You drive in a straight line at 22 m/s for 12 miles, then at 30 m/s for another 12 miles. (a) How does your average speed sav co

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Explanation:One method of calculating average speed is to divide the total distance by the total time spent

d1=d2= 12 miles

d1=d2= 19312.1 m

$t1=\frac{d1}{u1} \\t1=19312.1/22\\t1=877.8 secs$

$t2=\frac{d2}{u2} \\t2=19312.1/30\\t2=673.7 secs$

$u_a=\frac{d1+d2}{t1+t2} \\u_a=25.385 m/s$

There is slight difference between the average speeds due to the reason that average speed is not just the midpoint of the speed but is the total distance traveled by total time.

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3 years ago

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Speaking bout mass,
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4 years ago

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agasfer [191]

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If a train going 60 m/s hits the breaks, and it takes the train 85 seconds to stop, what is the train´s acceleration

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Acceleration is change in velocity over time --> $a = \frac{Δv}{t}$

Δv or change in velocity equals the Final velocity minus the initial velocity

Our initial velocity here is 60m/s while our final velocity is 0 m/s

The time interval is 85 seconds so...

$a = \frac{0-60}{85}$

$a = \frac{-60}{85}$

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The negative is there to indicate that the train in slowing down or decelerating

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4 years ago