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emmasim [6.3K]
3 years ago
12

The distance between two subway station is 3 miles if a train travels between the two stations at an average speed of 60 mph how

many minutes does it take for the train to finish the trip between the two stations
Physics
1 answer:
Andreyy893 years ago
6 0

Answer:

It takes 3 minutes.

Explanation:

The distance between the two subways is 3 miles.

The train travels at an average speed of 60mph (miles per hour).

\frac{60miles}{1 hour} * \frac{1hour}{60minutes} = \frac{1mile}{1minute}

We have to convert hours to minutes and we do that by cancelling out the hours and replacing it with minutes.

There are 60 minutes in an hour so we use that, 1 hour/60 minutes and multiply it to the existing speed we have.

The result is 1 mile per minute.

We then multiply the miles by 3 since that is how much we want and we get 3 minutes.

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A team of engineers is working together to design a new airplane. The team members each live in different cities. For which purp
Ierofanga [76]

Answer:

The internet is most useful to them because they use it to communicate.

Explanation:

If I were to send a message to my brother in Florida, through the internet, while I'm in Pennsylvania he would get it in minutes. On the other hand if I were going to meet him and then explain what I wanted to tell him in person it would take a much longer time.  

8 0
3 years ago
A toy rocket launcher can project a toy rocket at a speed as high as 35.0 m/s.
Anestetic [448]

Answer:

(a) 62.5 m

(b) 7.14 s

Explanation:

initial speed, u = 35 m/s

g = 9.8 m/s^2

(a) Let the rocket raises upto height h and at maximum height the speed is zero.

Use third equation of motion

v^{2}=u^{2}+2as

0^{2}=35^{2}- 2 \times 9.8 \times h

h = 62.5 m

Thus, the rocket goes upto a height of 62.5 m.

(b) Let the rocket takes time t to reach to maximum height.

By use of first equation of motion

v = u + at

0 = 35 - 9.8 t

t = 3.57 s

The total time spent by the rocket in air = 2 t = 2 x 3.57 = 7.14 second.

8 0
3 years ago
Differentiate x sin nx
Sedaia [141]

Answer:

x sin nx = x cos nx

same as

theta  / theta x    (xsin (nx)) = sin (nx) + (nx) cos (nx)

7 0
2 years ago
Read 2 more answers
Electrons are emitted from a surface when light of wavelength 500 nm is shone on the surface but electrons are not emitted for l
liberstina [14]

Explanation:

Given: \lambda = 500\:\text{nm} = 5×10^{-7}\:\text{m}

\nu = \dfrac{c}{\lambda} = \dfrac{3×10^8\:\text{m/s}}{5×10^{-7}\:\text{m}}

\:\:\:\:\:= 6×10^{14}\:\text{Hz}

The work function \phi is then

\phi = h\nu = (6.626×10^{-34}\:\text{J-s})(6×10^{14}\:\text{Hz})

\:\:\:\:\:\:\:= 3.98×10^{-19}\:\text{J}

3 0
2 years ago
A 0.245 kg ball is thrown straight up from 2.07 m above the ground. Its initial vertical speed is 8.00 m/s. A short time later,
iris [78.8K]

Answer:

The work done by gravity is 4.975 \: Joules

Explanation:

The data given in the question is :

Mass is 0.245 kg

Height from ground is 2.07 m

As we know , the work done is state function , it depends on initial and final position not on the path followed.

So, work done by gravity = change in potential energy

Work done = Initial potential energy - final potential energy

Insert values from question

Work done = mass \times gravity \times (change \: in \: height)

Work done = 0.245 kg \times 9.81 m/s^{2} \times 2.07 m

So, work done = 4.975 Joules

Hence the work done by gravity is 4.975 \: Joules

3 0
3 years ago
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