A radar installation operates at 9 000 MHz with an antenna (dish) that is 15 meters across. Determine the maximum distance (in kilometers) for which this system can distinguish two aircraft 100 meters apart
a. 7.4 km
b. 370 km
c. 3700 m
d. 37 km
e. 740 km
D
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Which of the following is the smallest distance?
A) diameter of a typical planet B) 1 light-second C) 1 AU D) diameter of a typical star
A ball thrown upward reaches its maximum height and then falls back. If air resistance is negligible, its acceleration is
A. the same at all points in the motion. B. less on the way up than on the way down. C. the same up and down but zero at the top. D. less on the way down than on the way up.
Stan argues that momentum cannot be conserved when a collision is not a head-on collision. Rachel insists it is conserved because each body receives an impulse of equal magnitude. Rachel is correct because
a. each body exerts an equal and opposite force on the other during the collision. b. the forces act during equal time intervals. c. the law of conservation of momentum for an isolated system is a vector equation. d. of all of the above. e. of only (a) and (b) above.
The y component of the electric field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation
Ey = (375 N/C) cos[kx - (2.20 × 1014 rad/s)t]. What is the wavelength of this electromagnetic wave? (c = 3.0 x 108 m/s) A) 0.272 µm B) 17.1 µm C) 2.72 µm D) 1.36 µm E) 8.57 µm