3 years ago

Which process is a physical change?

Physics

1 answer:

zlopas [31]3 years ago

7 0

Water boiling, no cheamical bonds have been altered.

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The engine of a locomotive exerts a constant force of 8.1*10^5 N to accelerate a train to 68 km/h. Determine the time (in min) t

Bumek [7]

Answer:443.1 s

Explanation:

Given

Engine of a locomotive exerts a force of $8.1\times 10^5 N$

Mass of train $=1.9\times 10^7$

Final speed (v) $=68 km/h \approx 18.88 m/s$

F=ma

so $acceleration(a) =\frac{F}{m}=\frac{8.1\times 10^5}{1.9\times 10^7}$

$a=0.042631 m/s^2$

and acceleration is

$a=\frac{v-u}{t}$

$0.042631=\frac{18.88-0}{t}$

$t=443.089 \approx 443.1 s$

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3 years ago

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CAN YOU PLS CHECK IF ITS CORRECT I'LL MARK YOU BRAINLIST

Alexus [3.1K]

i think it looks good

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BTW yw if it's right

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3 years ago

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Which ball (if either) has the greatest speed at the moment of impact

Ierofanga [76]

Are there any options??

I would have to say metal of course but without options I can't assume anything

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a light-year is ____ A. the amount of time it takes light to get to the nearest star B. the distance light travels in a day C. t

Vinil7 [7]

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A snail travels 300 cm in 4 minutes.calculate speed of snail in m/s

LekaFEV [45]

Answer:

$\frac{0.0125m}{s}$

Explanation:

In order to solve this question we need to know that $speed = \frac{distance}{time}$ . Then we need to convert 4 minutes into seconds and cm into m. We can do that by multiplying the number of minutes by 60 (because there is 60 seconds in one minute) and dividing the number of cm by 100 (because there is 100 cm in one m). So.......

4min = 4 x 60s = 240s

300cm = 300/100 m = 3m

Now we know that distance = 300m, and that the time = 4min = 240s ⇒

⇒ $speed=\frac{distance}{time} = \frac{3m}{240s} = \frac{0.0125m}{s}$

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3 years ago