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sveta [45]
3 years ago
12

A train leaves the station heading south on the tracks. It takes 5 seconds to reach 50 miles per hour. It completes the entire 1

00 mile trip in 2 hours. Calculate the trains average speed and velocity over the two hour trip. Show your work. Identify each of the measurements are a ascalr or vector.
Physics
2 answers:
Musya8 [376]3 years ago
8 0
Well, in order to figure out the answer is to divide until you figure out how many miles they went per second. If it takes 5 seconds to reach 50 miles per hour it took 10 seconds per every 10 miles meaning each mile took 1 second. (Not actually possible but the answer) So, If it finished a 100 mile trip in 2 hours it took an hour for 50 miles. If it took 1 hour for 50 miles divide 60/50 which gets you 1.2 so it took 1.2 miles per minute meaning the car went 120 miles per hour I believe. I hope this helps :)
PilotLPTM [1.2K]3 years ago
4 0

Answer:

Average speed is 50 mph

Average velocity is -50 mph . It is negative since it is towards south.

Explanation:

Distance is a scalar quantity and velocity is a vector. So for a vector, both magnitude and direction should be specified.

Average speed is the total distance over total time taken . So it is 100 miles over 2 hours which gives 50 mph.

Average velocity has the same magnitude and is also 100miles over 2 hours but it is negative since velocity is a vector and it is directed towards south.

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Dafna11 [192]
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3 0
3 years ago
An assumption central to all scientific inquiry is causality, which means that
zavuch27 [327]
<h2>Answer</h2>

Causality means reason behind the process

<h2>Explanation</h2>

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7 0
3 years ago
Suppose that the space shuttle Columbia accelerates at 14.0 m/s2 for 8.50 minutes after takeoff.
givi [52]

Answer:

A. speed = 7.14 Km/s

B. distance = 1820.7 Km

Explanation:

Given that: a = 14.0 m/s^{2}, t = 8.50 minutes.

But,

t = 8.50 = 8.50 x 60

  = 510 seconds

A. By applying the first equation of motion, the speed of the shuttle at the end of 8.50 minutes can be determined by;

v = u + at

where: v is the final velocity, u is the initial velocity, a is the acceleration and t is the time.

u = 0

So that,

v = 14 x 510

 = 7140 m/s

The speed of the shuttle at the end of 8.50 minute is 7.14 Km/s.

B. the distance traveled can be determined by applying second equation of motion.

s = ut + \frac{1}{2}at^{2}

where: s is the distance, u is the initial velocity, a is the acceleration and t is the time.

u = 0

s = \frac{1}{2}at^{2}

  = \frac{1}{2} x 14 x (510)^{2}

 = 7 x 260100

 = 1820700 m

The distance that the shuttle has traveled during the given time is  1820.7 Km.

5 0
3 years ago
A volumetric flask made of Pyrex is calibrated at 20.0°C. It is filled to the 285-mL mark with 40.5°C glycerin. After the flask
Charra [1.4K]

Answer:

V_f = 287.04 mL

Explanation:

We are given the initial/original volume of the glycerine as 285 mL.

Now, after it is finally cooled back to 20.0 °C , its volume is given by the formula;

V_f = V_i (1 + βΔT)

Where;

V_f is the final volume

V_i is the original volume = 285 mL

β is the coefficient of expansion of glycerine and from online tables, it has a value of 5.97 × 10^(-4) °C^(−1)

Δt is change in temperature = final temperature - initial temperature = 32 - 20 = 12 °C

Thus, plugging in relevant values;

V_f = 285(1 + (5.97 × 10^(-4) × 12))

V_f = 287.04 mL

7 0
3 years ago
1 point
White raven [17]

Answer:

Waves transfer energy, not motion

8 0
3 years ago
Read 2 more answers
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