« previous next »

Author Question: A radar pulse sent out to an airplane at a distance of 20.0 km will return as an echo to the source ... (Read 84 times)

Sportsfan2111

  • Hero Member
  • *****
  • Posts: 585
on: Jul 28, 2018
A radar pulse sent out to an airplane at a distance of 20.0 km will return as an echo to the source in what time interval? (c = 3.00  108 m/s)
 a. 33.3  10-6 s
  c. 66.7  10-6 s
  b. 133  10-6 s
  d. 0.0333  10-6 s

Question 2

A 500-Hz whistle is moved toward a listener at a speed of 10.0 m/s. At the same time, the listener moves at a speed of 20.0 m/s in a direction toward the whistle. What is the apparent frequency heard by the listener? (The speed of sound is 340 m/s.)
 a. 473 Hz
  c. 533 Hz
  b. 485 Hz
  d. 545 Hz


alexisweber49

  • Sr. Member
  • ****
  • Posts: 311
Reply #1 on: Jul 28, 2018
Answer to Question 1

B

Answer to Question 2

D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

Sportsfan2111

  • Hero Member
  • *****
  • Posts: 585
Reply #2 on: Jul 28, 2018
TY


alexisweber49

  • Sr. Member
  • ****
  • Posts: 311
Reply #3 on: Jul 28, 2018
You're welcome


« previous next »
 

Did you know?

Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.

Did you know?

Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

Did you know?

The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.

Did you know?

Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.

Did you know?

Approximately 500,000 babies are born each year in the United States to teenage mothers.

Lithotripsy. The direction of a sound pulse crushes the stones into smaller fragments that can be pa Lithotripsy. The direction of a sound pulse crushes the stones into smaller fragments that can be pa
Ultrasound stethoscope in position on the pedal pulse Ultrasound stethoscope in position on the pedal pulse
The proportion of men and women with elevated blood pressure or taking hypertension medication incre The proportion of men and women with elevated blood pressure or taking hypertension medication incre
Major Findings of the High Scope Preschool Study High Scope participants showed better academic per Major Findings of the High Scope Preschool Study High Scope participants showed better academic per
Milk is essential source of calcium Milk is essential source of calcium
Body sites where the peripheral pulse is most easily palpated Body sites where the peripheral pulse is most easily palpated
Video: Ventilation - phases and driving forces

For a complete list of videos, visit our video library