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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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.
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
Large fractures in Earth's surface that are associated with movement of lithospheric plates are called ______________
Fill in the blank(s) with correct word
Terrestrial planets, like Earth, are made up of rock and metal
a. True b. False Indicate whether the statement is true or false