Author Question: A train is traveling away from you at 120 km/h. It blows its whistle, and you hear a tone of 0.400 ... (Read 84 times)

Melani1276

  • Hero Member
  • *****
  • Posts: 516
A train is traveling away from you at 120 km/h. It blows its whistle, and you hear a tone of 0.400 kHz. Take the speed of sound to be 340 m/s. What frequency does the whistle actually produce?
 
  A) 444 Hz
  B) 439 Hz
  C) 364 Hz
  D) 361 Hz

Question 2

A conductor is placed in a steady external electric field. Which of the following statements are correct for this situation? (There could be more than one correct choice.)
 
  A) The electric field is zero inside the conductor.
  B) All the free electrons go to the surface of the conductor.
  C) The surface of the conductor is neutral.
  D) The electric field just outside the surface of the conductor is perpendicular to the surface.
  E) None of the above statements are correct.


joewallace

  • Sr. Member
  • ****
  • Posts: 337
Answer to Question 1

B

Answer to Question 2

A, B, D



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

Did you know?

Signs and symptoms that may signify an eye tumor include general blurred vision, bulging eye(s), double vision, a sensation of a foreign body in the eye(s), iris defects, limited ability to move the eyelid(s), limited ability to move the eye(s), pain or discomfort in or around the eyes or eyelids, red or pink eyes, white or cloud spots on the eye(s), colored spots on the eyelid(s), swelling around the eyes, swollen eyelid(s), and general vision loss.

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Did you know?

About 60% of newborn infants in the United States are jaundiced; that is, they look yellow. Kernicterus is a form of brain damage caused by excessive jaundice. When babies begin to be affected by excessive jaundice and begin to have brain damage, they become excessively lethargic.

Did you know?

About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

For a complete list of videos, visit our video library