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
Diano4ka-milaya [45]
3 years ago
14

Find the time taken if the speed of a train increased rom 72km/h to 90km/h for 234km

Physics
2 answers:
bagirrra123 [75]3 years ago
8 0

Answer:

Explanation:

s = s₀ + v₀t + ½at²

Let s₀ = 0 be the position in km where acceleration starts,

Let t be in hours

a = (90 - 72) / t = 18/t  km/hr²

234 = 0 + 72t + ½(18/t)t²

234 = 72t + 9t

234 = 81t

t = 2.88888... ≈ 2.89 hr

Katarina [22]3 years ago
7 0

Answer:

2.89 hours

Explanation:

given :

Vo = 72 km/h

Vt = 90 km/h

S = 234 km

find : the time taken (t) = ?

solution :

2.a.s = Vt² - Vo²

2.a.(234) = 90²- 72²

468.a = 8100 - 5184

= 2916

a = 2916/468 = 6.23 km/h²

so,

t = (Vt-Vo) /a

= (90-72)/ 6.23

= 18/ 6.23

= 2.89 hours

You might be interested in
What conclusion can be draw about the heat of fusion of water from the heating curve?
PtichkaEL [24]

Answer: C) The kinetic energy and the entropy of the water molecules increases through fusion.

Explanation:

7 0
3 years ago
Read 2 more answers
Wood, plastic, rubber and glass are ________, which are materials that electricity cannot easily flow through.
irina [24]

Answer:

Insulators

Explanation:

7 0
3 years ago
Why does carpet tend to produce differences in static electricity more that hardwood or tile floors
Makovka662 [10]

Answer:

This is because the rubbing releases negative charges, called electrons, which can build up on one object to produce a static charge. For example, when you shuffle your feet across a carpet, electrons can transfer onto you, building up a static charge on your skin.

Explanation:

This is because the rubbing releases negative charges

4 0
4 years ago
calculate the work done by 2N force directed at 30 degree to the vertical to move a 500g box a horizontal distance of 400 cm acr
sattari [20]

Answer:

there is no picture :o?

Explanation:

:oo

3 0
3 years ago
Substances X and Y are both nonpolar. If the volatility of X is higher than that of Y, what is the best explanation?
lesya692 [45]
I believe the correct answer from the choices listed above is the last option.  If the volatility of X is higher than that of Y, then  <span>Y’s molecules experience stronger London dispersion forces than X’s molecules. All molecules has london dispersion forces. Also,  the stronger the bond, the harder it is to volatilize. Hope this answers the question.</span>
4 0
3 years ago
Read 2 more answers
Other questions:
  • Which two men developed the steam engine?
    10·1 answer
  • Muscles convert chemical energy into A) light energy. B) nuclear energy. C) mechanical energy. D) electromagnetic energy.
    15·2 answers
  • Spiral galaxy rotation curves are generally fairly flat out to large distances. Suppose that spiral galaxies did not contain dar
    5·1 answer
  • I have attached the question
    11·1 answer
  • .Please explain to me how to find the momentum
    11·1 answer
  • Why do you think silicon is used in electronic components
    14·2 answers
  • Gravitational potential energy = the energy due to an objects
    8·1 answer
  • A 1500 kg car has an applied forward force of 5000 N and experiences an air resistance of 1250 N. What is the car's acceleration
    6·1 answer
  • Discuss the importance of frequency, wavelength and energy in
    13·1 answer
  • A plane flies with an average velocity of -98 m/s for 45.0 s. What was its displacement
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!