The boat that will sail fastest in the intended direction is
1) 1,
2) 2,
3) 3,
4) 4,
and the boat that responds least to the wind is
5) 1.
6) 2.
7) 3.
8) 4.
Answer: 2, 5
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A high fountain of water is in the center of a circular pool of water. You walk the circumference of the pool and measure it to be 170 meters. You then stand at the edge of the pool and use a protractor to gauge the angle of elevation of the top of the fountain. It is 51°. How high is the fountain?
a. 17 m c. 30 m b. 23 m d. 33 m
Generally speaking, activity on the surface of the Sun is primarily driven by
A. electromagnetism. B. gravity. C. nuclear reactions. D. thermodynamics.
As a helium-filled dirigible rises in the atmosphere, the buoyancy force is expected to
A) increase. B) remain constant. C) decrease.
Why do we need new forms of technology to make it possible to journey to the nearest stars within a human lifetime?
What will be an ideal response?