Old stars are poor in heavy elements because there were very few previous generations of stars before the old stars formed
a. True
b. False
Indicate whether the statement is true or false
True
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Which is the largest planet?
A. Uranus B. Jupiter C. Earth D. Neptune E. Saturn
Almost every solid surface in the Solar System is covered with _______________, most of which formed during a period of heavy bombardment
Fill in the blank(s) with correct word
Three particles are placed in the xy plane. A 30-g particle is located at (3, 4) m, and a 40-g particle is located at (?2, ?2) m. Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?
A. (?3, ?1) m B. (+1, +3) m C. (+3, ?1) m D. (?1, ?3) m E. (?0.5, ?2) m
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The acceleration after starting from rest is 8 m/s2
a. True b. False Indicate whether the statement is true or false