A jet aircraft, in level flight at constant speed, is observed directly overhead. A sonic boom is heard 13.0 s later, at which time the line of sight to the aircraft forms a 51° angle with respect to the horizontal. The speed of sound is 325 m/s
The altitude of the aircraft is closest to A) 6700 m.
B) 5400 m.
C) 8300 m.
D) 2700 m.
E) 13,000 m.
A
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The mass enclosed in any orbit can be estimated from the equation M( A) The mass is spread out over large radius.
B) The mass is concentrated in the center.
C) The mass is distributed like a doughnut, with a hole in the center.
D) Cannot be determined from the information given.
A silicon rod 20 cm in diameter and 30 cm long is exposed to a high temperature at one end so that the end is at 400ºC whereas the remaining surfaces are at 60ºC. Estimate the centerline temperature distribution through the rod.
What will be an ideal response?
According to special relativity, what is the speed of light measured in a space ship traveling at 0.40 c?
A. 0.60 c B. 1.4 c C. 0.86 c D. 1.0 c E. None of these choices are correct.
Conduction electrons move to the right in a certain wire. This indicates that:
A) the current density points left but the direction of the electric field is unknown B) the current density and electric field both point right C) the current density and electric field both point left D) the current density points right and the electric field points left E) the current density points left and the electric field points right