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
Temka [501]
3 years ago
14

Two trains are traveling on the same track and in the same direction. The first train, which is behind the second train, blows a

horn whose frequency is 269 Hz. The second train detects a frequency of 290 Hz. If the speed of the second train is 13.7 m/s, what is the speed of the first train?
Physics
1 answer:
Andrews [41]3 years ago
5 0

Answer:

37.545 m/s

Explanation:

f' = Actual frequency of horn = 269 Hz

f = Observed frequency of horn = 290 Hz

v = Speed of sound in air = 343 m/s

v_0 = Speed of second train = 13.7 m/s

v_s = Speed of first train

From Doppler effect we have

f=f'\dfrac{v-v_0}{v-v_s}\\\Rightarrow v_s=v-\dfrac{f'}{f}(v-v_0)\\\Rightarrow v_s=343-\dfrac{269}{290}(343-13.7)\\\Rightarrow v_s=37.545\ m/s

The speed of the first train is 37.545 m/s

You might be interested in
Which situation is the best example of translational motion?.
AleksAgata [21]

Answer:

 a block sliding down a ramp,a leaf blowing across a field

8 0
2 years ago
"A 78-year-old woman has a mean arterial pressure of 120 mm Hg and a heart rate of 60 beats/min. She has a stroke volume of 50 m
aivan3 [116]

Answer:

0.04 mm Hg / mL / min .

Explanation:

Arterial pressure = 120 mm Hg

right atrial pressure = 0 mm Hg

Drop in pressure due to peripheral resistance = 120 mm Hg

volume of cardiac output per minute = 3000 mL/min

total  peripheral resistance

= 120 / 3000 mm Hg / mL / min

= 0.04 mm Hg / mL / min .

8 0
3 years ago
An aircraft travels 1000. km west and then travels 500. km west. what is its total displacement?
UkoKoshka [18]
1000-500=500 km. to the west.
5 0
3 years ago
The current through two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resista
Rus_ich [418]

The resistance of a single light bulb is 220 ohms per bulb.

<h3>What is Ohm's Law?</h3>

Ohm's Law is a formula used to determine how voltage, current, and resistance in an electrical circuit relate to one another.

Ohm's Law (E = IR) is as basic to students of electronics as Einstein's Relativity equation (E = mc2) is to physicists.

E = I x R

The formula reads voltage = current x resistance, or V = A xΩ., or volts = amps x ohms.

110volts divided by .25amps = 440 ohms. 440 divided by 2 =220 ohms per bulb.

R = 110/(2*0.25) = 220 ohms

to learn more about Ohms law go to - brainly.com/question/14296509

#SPJ4

4 0
2 years ago
Why does conduction occur more slowly in gases than in solids?​
Nataly [62]
Onduction in gas is slower than in liquids and solids because the particles in a gas collide less often. Conduction in metals is faster because the electrons are free to move about
4 0
3 years ago
Other questions:
  • What is a good analogy for potential energy in a circuit?
    14·1 answer
  • A square metal block with mass (m) is suspended by five wires with the same length. One of these wires is made of iron at the ce
    15·1 answer
  • A basketball star covers 2.70 m horizontally in a jump to dunk the ball (see figure). His motion through space can be modeled pr
    7·1 answer
  • A free positive charge released in an electric field will _____
    15·1 answer
  • Problems with solar energy include ____.
    14·2 answers
  • I mostly know how to do these vector problems i’m just confused on how many decimal places i use
    15·2 answers
  • A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. Wha
    10·1 answer
  • Which statement is true:
    11·1 answer
  • Season and date for this person
    11·2 answers
  • What is the electric current if a resistance of 100 Q and voltage of 12.0 V?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!