These four motion diagrams show the motion of a particle along the x-axis. Which motion diagrams correspond to a positive acceleration?
a. A and D
b. B and D
c. A, B, C, and D
d. A and C
Answer: d. A and C
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A lobster crawls onto a bathroom scale on the ocean floor. Its weight compared to its weight above the surface is
A) greater. B) less. C) the same.
If we say that a material is opaque to ultraviolet light, we mean that it
A) absorbs ultraviolet light. B) emits ultraviolet light. C) transmits ultraviolet light. D) reflects ultraviolet light.
When did life first appear on Earth?
a. 14 billion years ago b. 400 million years ago c. 4.6 billion years ago d. 65 million years ago e. 3.4 billion years ago
A radar installation operates at 9000 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