Free Fall: A laser is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is 1.5 m/s2 and there is no atmosphere. What is the maximum height reached by the laser?
A. 8.0 m
B. 18 m
C. 48 m
D. 144 m
Answer: C
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The sound from a single source can reach point O by two different paths. One path has a length 20.0 m and the second path has a length 21.0 m. The sound destructively interferes at point O
What is the minimum frequency of the source if the speed of sound is 340 m/s? A) 340 Hz B) 6800 Hz C) 520 Hz D) 680 Hz E) 170 Hz
The reason we don't have solar and lunar eclipses monthly is because of the
A) relatively close distance of the Moon and Earth. B) relatively long distance to the Sun. C) tapering of the Sun's rays. D) different orbital planes for Earth and the Moon. E) 23° tilt of the Earth's axis.
Which portion of the electromagnetic spectrum is used in aircraft navigation?
a. infrared waves b. microwaves c. radio waves d. ultraviolet light
The electric field at the surface of a conductor is
A) always zero. B) perpendicular to the surface. C) parallel to the surface. D) never zero.