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
joja [24]
3 years ago
9

A passenger train travels 392 mi in the same time that it takes a freight train to travel 322 mi. If the passenger train travels

20 mi/h faster than the freight train, find the speed of each train.
Physics
1 answer:
Yuri [45]3 years ago
6 0

Answer:

Explanation:

Given

distance traveled by  Passenger train is d_1=392\ mi

distance traveled by  Freight train is d_2=322\ mi

Both take same time to travel

suppose speed of freight train is x mph

so speed of passenger train is 20+x mph

we know time=\frac{distance}{speed}

t=\frac{392}{20+x}=\frac{322}{x}

392x=322x+322\times 20

70x=322\times 20

x=92\ mph

speed of passenger train x+20=112\ mph  

You might be interested in
The process of conversion of solid into gas and again gas into solid is known as
pantera1 [17]
Sublimation is when a solid becomes a gas.  And gas to solid is deposition.
6 0
3 years ago
The temperature of a superconductor is gradually lowered. At the critical temperature, how does the resistivity of the supercond
san4es73 [151]

At critical temperature, the resistivity of the superconductor

B. It suddenly drops to zero

Explanation:

Materials can be classified into three different types depending on their resistance:

  • Conductors: these materials have generally low resistance and allow electricity to pass through easily. The resistance of a conductor increases linearly with the temperature
  • Insulators: these materials do not allow electricity to pass through - so they have very high resistance
  • Semi-conductors: these are materials that are insulators are room temperature, however they becomes conductors when heated. Therefore, the resistance of a semiconductor decreases when the temperature increases
  • Superconductors: these are special materials that are normally conductors; however, at very low temperatures (we are talking about temperature very near to 0 K), their resistance becomes suddenly zero.

Therefore, the correct answer is:

B. It suddenly drops to zero

Learn more about current and resistance:

brainly.com/question/4438943

brainly.com/question/10597501

brainly.com/question/12246020

#LearnwithBrainly

8 0
3 years ago
Hi hi someone talk to meeeee
Elina [12.6K]
Hi I’ll talk to you!
4 0
3 years ago
5. The condition of the road surface affects total stopping distance.<br>A. true<br>B. false​
Tom [10]

Answer:

A true

Explanation:

Can you please give me brainiest.

7 0
3 years ago
Which of the following objects most likely has a constant speed?
Pachacha [2.7K]
A car that makes a u turn
8 0
3 years ago
Read 2 more answers
Other questions:
  • The force of repulsion between two like-charged particles will increase if
    12·2 answers
  • Please help
    10·1 answer
  • What is in the boron family with 3 valence electrons
    13·1 answer
  • Q3. A bridge is built without expansion gaps.
    8·1 answer
  • If an object on a horizontal frictionless surface is attached to a spring, displaced, and then released, it will oscillate. If i
    8·2 answers
  • Can the resistors in an "unbalanced" Wheatstone bridge circuit be treated as a combination of series and/or parallel resistors?
    9·1 answer
  • At the Indianapolis 500, you can measure the speed of cars just by listening to the difference in pitch of the engine noise betw
    9·1 answer
  • The time required to produce one cycle of a wave is known as the waves
    13·1 answer
  • Why is tornadoes hitting the east coast of the USA?
    14·1 answer
  • A 10 g bullet moving horizontally with a speed of 2000 m/s strikes and passes through a 4.0 kg block moving with a speed of 4.2
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!