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sweet-ann [11.9K]
4 years ago
6

Two trains leave the same station at the same time. The first train travels north at 60 mph. The second train travels west at 45

mph. Find how fast the distance between the trains is changing two hours after the trains have left.
Physics
1 answer:
Marizza181 [45]4 years ago
8 0

Answer:

15 mph

Explanation:

Velocity = Distance/time

Distance, D = velocity * time

After 2 hours, the first train would have covered a distance of:

D1 = 60 * 2 = 120 miles

The second train would have covered a distance of:

D2 = 45 * 2 = 90

The difference in the distance covered by the two trains after 2 hours is:

ΔD = D1 - D2

ΔD = 120 -90

ΔD = 30 miles

The rate at which the distance is changing, Rate = ΔD/Δt

Rate = 30/2

Rate = 15 mph

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Answer:

The velocity of the other fragment immediately following the explosion is v .

Explanation:

Given :

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Since , no eternal force is applied in the particle .

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So , Final momentum = Initial momentum

mv=\dfrac{mv}{2}+\dfrac{mu}{2}\\\\u=v

The velocity of the other fragment immediately following the explosion is v .

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3 years ago
Class characteristics serve as corroboration for other, more subjective pieces of evidence in a courtroom (like witness testimon
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Explanation:

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8 0
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3 0
1 year ago
Solve:40KMEN
Oksanka [162]

The spider will cross the driveway <u>25.71 in seconds</u>.

Why?

It's a conversion problem, so, in order to solve it, we need to convert the units of the given information.

Let's convert the given speed (in cm/s) to m/s.

We know that:

1m=100cm

So, converting we have:

14\frac{cm}{s}*\frac{1m}{100cm}=0.14\frac{m}{s}

Then, calculating the time, we have:

distance=speed*time\\\\3.6m=0.14\frac{m}{s}*time\\\\time=\frac{3.6m}{0.14\frac{m}{s}}=25.71s

We have that the spider will cross the driveway in 25.71 seconds.

Have a nice day!

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4 years ago
Radioactive isotopes of an atom are:
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Radioactive isotopes of an atom aren't as stable as you would think, so the correct answer is: C. Less Stable

(I can verify this because I took the test.)

Hope this helps! Have a wonderfully wonderful day!

Cheers mate!

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