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ale4655 [162]
3 years ago
7

The engineer of a passenger train traveling at 25.0m/s sights a freight train whose caboose is 200m ahead on the same track. The

freight train is traveling at 15.0 m/s in the same direction as the passenger train. The engineer of the passenger train immediatly applies the brakes causing a constant acceleration of .100m/s^2 in a direction opposite to the trains velocity, while the freight train continues with constant speed. will there be a collision?
Physics
1 answer:
Vika [28.1K]3 years ago
5 0

Answer:

No, there won't be a collision.

Explanation:

We will use the constant acceleration formulas to calculate,

v = u + a*t

0 = 25 + (-0.1)*t

t = 250 seconds (the time taken for the passenger train to stop)

v^2 = u^2 + 2*a*s

0 = (25)^2  + 2*(-0.1)*s

s = 3125 m (distance traveled by passenger train to stop)

If the distance traveled by freight train in 250 seconds is less than (3125-200=2925 m) than the collision will occur

Speed*time = distance

Distance = (15)*(250)

Distance = 3750 m

As the distance is way more, there won’t be a collision

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The white dwarf that remains when our sun dies will be mostly made of
expeople1 [14]

Answer:

Carbon and oxygen

Explanation:

White dwarfs are the stars which have used all their hydrogen and helium fuel and now exists with only carbon and oxygen in their core. Their size reduces up to one hundredth times of the size of their sun in early stages and yet they possess the same mass.  

Due to loss of fuels and impact of gravity, a young star collapses on itself leading to formation of dwarf star.

 

7 0
3 years ago
Jeremy ran a race at a speed of 15 m/s in a time of 8 seconds. Calculate the distance he ran.
Masja [62]

Answer:

120 m/s if m/s means miles per second than

Explanation:

15 × 8

8 0
3 years ago
Read 2 more answers
What is the net work done<br> on the object over the distance shown?
enyata [817]

Answer:

0

Explanation:

the positive cancels out the negative area

3 0
2 years ago
In which direction would the circle go if it was in between a positive and negative charge
evablogger [386]
It would go to the positive charge im like 99% sure of that
7 0
3 years ago
7. A roller coaster’s velocity at the top of a hill is 10 m/s. Two seconds later it reaches the bottom ofthe hill with a velocit
zheka24 [161]

Answer:

7) a=8m/s^2

8) a=-5m/s^2

9) a=-1.5m/s^2

10) v=29.4m/s

Explanation:

For the problems 7, 8 and 9 we just apply the definition of acceleration, since no more information is given, which is:

a=\frac{\Delta v}{\Delta t}=\frac{v_f-v_i}{t_f-t_i}

So for each problem we will have:

7) a=\frac{26m/s-10m/s}{2s}=8m/s^2

8) a=\frac{10m/s-25m/s}{3s}=-5m/s^2

9) a=\frac{0m/s-15m/s}{10s}=-1.5m/s^2

For the problem 10, we use the equation of velocity in accelerated motion:

v=v_0+at

Since the ball starts from rest and the acceleration is that of gravity (we take the downward direction positive), we have:

v=(0m/s)+(9.8m/s)(3s)=29.4m/s

5 0
3 years ago
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