A person jogs toward a plane mirror at a speed of 3 m/s. How fast is he approaching his image in the mirror?
A) 1 5 m/s
B) 3 m/s
C) 4 m/s
D) 5 m/s
E) 6 m/s
E
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Vector = 6.0 m and points 30° north of east. Vector = 4.0 m and points 30° south of west. The resultant vector + is given by
A) 2.0 m at an angle 30° north of east. B) 2.0 m at an angle 60° north of east. C) 10.0 m at an angle 60° east of north. D) 10.0 m at an angle 30° north of east. E) 10.0 m at an angle 60° north of east.
Traveling at their current speeds, how long would it take the Pioneer and Voyager probes to travel the distance to the nearest stars?
A) at least 100,000 years B) several billion years C) around 4.4 years D) about a 1,000 years
A Geiger counter placed 1 meter from a point source of radiation registers 100 counts per minute. If the Geiger counter is moved closer, half-way to the source, the counting rate will be
A) 25 counts/min. B) 50 counts/min. C) 100 counts/min. D) 200 counts/min. E) 400 counts/min.
The characteristic rotational energy, h2/8?2I, for O2 is 2.9 × 10-23 J. Calculate the O2 bond length
A) 3.6 × 10-10 m B) 0.60 × 10-11 m C) 1.2 × 10-10 m D) 0.30 × 10-11 m E) 2.4 × 10-10 m