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?
17. N
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What color are the star clusters in the spiral arms and what does that mean?
A.) Red and that means they are old. B.) Red and that means they have just formed recently. C.) Blue and that means they are old. D.) Blue and that means they have just formed recently. E.) Black and that means they are covered by dust.
Which of the following is true of the signs of the zodiac?
A) They have a huge impact on the seasons. B) They are no longer important in astronomy. C) They determine the course of Earth's orbit. D) They are no longer important in astrology.
A heat engine operates between a high temperature reservoir at TH and a low temperature reservoir at TL. Its efficiency is given by 1 ? TL/TH :
A. only if the working substance is an ideal gas B. only if the engine is reversible C. only if the engine is quasi-static D. only if the engine operates on a Stirling cycle E. no matter what characteristics the engine has
Conversion of Units: An oak tree was planted 22 years ago. How many seconds does this correspond to? (Do not take leap days into account.)
A. 6.9 × 108 B. 1.2 × 107 C. 2.9 × 107 D. 2.8 × 108