What technology do astronomers use to search for extraterrestrial life??
a. space observatories
b. radio telescopes
c. refracting telescopes
d. reflecting telescopes
e. FM radio and televisions
Answer: b. radio telescopes
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A sled of mass 10. kg slides down a flat hill that makes an angle of 10.° with the horizontal. If friction is negligible, what is the resultant force on the sled?
What will be an ideal response?
Which of the following statements about an ellipse is not true?
A) The semimajor axis of an ellipse is half the length of the longest line that you can draw across an ellipse. B) An ellipse with a large eccentricity looks much more elongated (stretched out) than an ellipse with a small eccentricity. C) A circle is considered to be a special type of ellipse. D) The focus of an ellipse is always located precisely at the center of the ellipse.
The colors you see with a prism result because of __________
Fill in the blank(s) with correct word
As a projectile thrown upward at a non-vertical angle moves in a parabolic path, at what point along its path are the velocity and acceleration vectors for the projectile parallel to each other?