1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
jek_recluse [69]
3 years ago
15

A train travels 225 kilometers in 2.5 hours. What is the train’s average speed?

Physics
2 answers:
ella [17]3 years ago
7 0
The train travells at he speed of 225 km/2.5h
now
225km=225000m
2.5 hr=150min=9000s
=>avg sp of train is=225000/9000s=25m/s
satela [25.4K]3 years ago
7 0

Answer:

562.5

Explanation:

You might be interested in
A street light is on top of a 8 foot pole. Joe,
zubka84 [21]
8/4 = y/y-x

8y - 8x  = 4y

y = 2x

y = 2 x 4

y = 8

Hope this helps
5 0
3 years ago
A particular balloon can be stretched to a maximum surface area of 1257 cm2. The balloon is filled with 3.1 L of helium gas at a
chubhunter [2.5K]

Answer:

The ballon will brust at

<em>Pmax = 518 Torr ≈ 0.687 Atm </em>

<em />

<em />

Explanation:

Hello!

To solve this problem we are going to use the ideal gass law

PV = nRT

Where n (number of moles) and R are constants (in the present case)

Therefore, we can relate to thermodynamic states with their respective pressure, volume and temperature.

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2} --- (*)

Our initial state is:

P1 = 754 torr

V1 = 3.1 L

T1 = 294 K

If we consider the final state at which the ballon will explode, then:

P2 = Pmax

V2 = Vmax

T2 = 273 K

We also know that the maximum surface area is: 1257 cm^2

If we consider a spherical ballon, we can obtain the maximum radius:

R_{max} = \sqrt{\frac{A_{max}}{4 \pi}}

Rmax = 10.001 cm

Therefore, the max volume will be:

V_{max} = \frac{4}{3} \pi R_{max}^3

Vmax = 4 190.05 cm^3 = 4.19 L

Now, from (*)

P_{max} = P_1 \frac{V_1T_2}{V_2T_1}

Therefore:

Pmax= P1 * (0.687)

That is:

Pmax = 518 Torr

6 0
3 years ago
Which of the following are not conditions for producing work?
TEA [102]

Answer:D

Explanation:

6 0
3 years ago
Read 2 more answers
(b) Two containers made of insulating material contain the same volume of water at room
masha68 [24]

Answer:

the volume of liquid decreased due to evaporation from the exposed free surface of water so molecules got evaporated .

evaporation occurs at room temperature.

5 0
2 years ago
A duck with a mass of 0.90 kilograms flies at a rate of 12.0 m/s. What is the kinetic energy of the duck?
bija089 [108]
It should be at about 65J. Not sure, hope I helped.
6 0
3 years ago
Read 2 more answers
Other questions:
  • If the distance between two objects is decreased to 1/10 of the original
    10·2 answers
  • 0.013*30A 340 g bird flying along at 6.0 m/s sees a 13 g insect heading straight toward it with a speed of 30 m/s. The bird open
    13·1 answer
  • 4 meters and the frequency is 3 hz what’s the wave speed
    5·2 answers
  • On a warm, balmy summer day you decide to relax by watching the latest building renovation in your neighborhood. You notice that
    13·1 answer
  • What is the variable that is manipulated by the experimenter during an experiment called
    14·1 answer
  • An electric fan is running on HIGH. After fan has been running for 1.1 minutes, the LOW button is pushed. The fan slows down to
    15·1 answer
  • If the forces acting on an object are balanced, what must be true about the motion of this object?
    10·2 answers
  • An object is projected from the ground with an upward speed of ų m/s has a speed of 23m/s when it is at a height of 5m above the
    13·1 answer
  • 1. Choose the statement that does not accurately describe observations
    12·2 answers
  • What happens to the atomic number of an atom when the number of neutrons in the nucleus of that atom increases? a It decreases b
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!