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
AlekseyPX
3 years ago
15

A high-speed bullet train accelerates and decelerates at the rate of 10 ft/s2. its maximum cruising speed is 120 mi/h. (round yo

ur answers to three decimal places.) (a) what is the maximum distance the train can travel if it accelerates from rest until it reaches its cruising speed and then runs at that speed for 15 minutes?
Physics
1 answer:
valina [46]3 years ago
3 0
What is the maximum distance the train can travel if it accelerates from rest until it reaches its cruising speed and then runs at that speed for 15 minutes?

d = vo*t + 0.5*a*(t**2)  ..........................(vo= initial speed = 0; a= acceleration; t=time, d = distance)

Vf  = vo  + a*t      (final speed, in this case it will be the cruising speed)


Since vo = 0 (starts from rest)

t = Vf/a

d = 0 + 0.5*a*((Vf/a)**2)

d =  (0.5/a)*(Vf)**2

a = 24545 miles/h2 = 10ft/s2


d1 =  (0.5/24545 miles/h2)*(120 mi/h)**2 = 0.293 miles

From cruising speed, distance traveled after 15 minutes (0.25h)

v = d/t ...................> d2 =v*t = <span>120 mi/h (0.25h)</span> = 30 miles

Maximum distance the train can travel,

D = d1 + d2 = 0.293 + 30  miles = 30.293 miles







You might be interested in
Point charges q1 = 14 µC and q2 = −60 µC are fixed at r1 = (5.0î − 4.0ĵ) m and r2 = (9.0î + 7.5ĵ) m. What is the force (in N) of
Lostsunrise [7]

Answer:

The force on q₁ due to q₂ is (0.00973i + 0.02798j) N

Explanation:

F₂₁ = \frac{K|q_1|q_2|}{r^2}.\frac{r_2_1}{|r_2_1|}

Where;

F₂₁ is the vector force on q₁ due to q₂

K is the coulomb's constant = 8.99 X 10⁹ Nm²/C²

r₂₁ is the unit vector

|r₂₁| is the magnitude of the unit vector

|q₁| is the absolute charge on point charge one

|q₂| is the absolute charge on point charge two

r₂₁ = [(9-5)i +(7.4-(-4))j] = (4i + 11.5j)

|r₂₁| = \sqrt{(4^2)+(11.5^2)} = \sqrt{148.25}

(|r₂₁|)² = 148.25

F_2_1=\frac{K|q_1|q_2|}{r^2}.\frac{r_2_1}{|r_2_1|} = \frac{8.99X10^9(14X10^{-6})(60X10^{-6})}{148.25}.\frac{(4i + 11.5j)}{\sqrt{148.25} }

      = 0.050938(0.19107i + 0.54933j) N

      = (0.00973i + 0.02798j) N

Therefore, the force on q₁ due to q₂ is (0.00973i + 0.02798j) N

7 0
3 years ago
What other places in the world use hydro kinetic energy to generate electrical power?
Elina [12.6K]

Answer:

Alaska: Hydrokinetic Energy Campbell CR9000X used for in-stream hydrokinetic device evaluation. Marine hydrokinetic energy power generation is an emerging sector in the renewable energy portfolio. Hydrokinetic devices convert the energy of waves, tidal currents, ocean currents or river currents into electrical power.

3 0
3 years ago
Two forces F1 = -7.90i + 5.40j and F2 = 9.00i + 7.60j are acting on an object with a mass of m = 6.30 kg. The forces are measure
IceJOKER [234]

Answer:

Answer:

Propotionality is important

Explanation:

Explanation:

7 0
2 years ago
Hai tiếp điểm hình trụ bằng đồng có đầu hình cầu bán kính R = 70mm, lực ép tiếp điểm F = 100N, Mô đun đàn hồi của đồng là 11.8 *
lisabon 2012 [21]

Answer:

5dhydydyeze6ese6z7zuezuze6ezyezyezzeze

6 0
3 years ago
Read 2 more answers
Which statement is true regarding coppers ability to conduct electricity
Alecsey [184]
Copper is the second best known electrical conducting substance. The first best one is silver. We almost always use copper because silver costs too much.
6 0
3 years ago
Other questions:
  • Kyle has a mass of 54 kg and is jogging at a velocity of 3 m/s. What is Kyle’s kinetic energy?
    14·2 answers
  • How do you calculate energie
    6·2 answers
  • The path a projectile takes is known as the Question 1 options: vertical component trajectory horizontal component parabola Ques
    10·2 answers
  • A 5-kg block(m1) is released (from rest) from the top of a 3.0-m high, frictionless incline. When the 5-kg block reaches the bot
    14·1 answer
  • I need help on this science
    8·1 answer
  • Im bored help me join this if u want with friends
    5·1 answer
  • Describe nucleus (animal) in your own words(20 points)​
    11·1 answer
  • An airplane flies with a constant speed of 560 miles per hour. How long will it take to travel a distance of 840 miles?​
    8·1 answer
  • Do two magnets create magnetic force fields that allow them to interact without touching? Did the investigation answer the quest
    6·1 answer
  • A single light beam is split into two equal beams, denoted a and b. beam a travels through a medium with a higher index of refra
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!