Doppler Effect: A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in the air is 343 m/s.
A. 68 Hz
B. 69 Hz
C. 70 Hz
D. 71 Hz
E. 72 Hz
Answer: C
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Terrestrial planets, like Earth, are made up of rock and metal
a. True b. False Indicate whether the statement is true or false
A steel hanger with solid cross section has horizontal force P 5 5.5 kN applied at free end D. Dimension variable b 5 175 mm and allowable normal stress is 150 MPa. Neglect self-weight of the hanger. The required diameter of the hanger is approximately:
(A) 5 cm
(B) 7 cm
(C) 10 cm
(D) 13 cm
The energy density of an electromagnetic wave in free space is
A) entirely in the electric field. B) entirely in the magnetic field. C) 1/4 in the electric field and 3/4 in the magnetic field. D) 1/4 in the magnetic field and 3/4 in the electric field. E) equally divided between the magnetic and the electric fields.
Large fractures in Earth's surface that are associated with movement of lithospheric plates are called ______________
Fill in the blank(s) with correct word