Early in the history of the universe, the universe was
A) colder.
B) the same temperature it is now.
C) hotter.
C
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A(n) ____________________ is a cool, dense cloud of dust and gas that is undergoing gravitational contraction
Fill in the blank(s) with correct word
Most of our knowledge of evolutionary tracks comes from stars found in ________
Fill in the blank(s) with correct word
A car enters a level, unbanked semi-circular hairpin turn of 300 m radius at a speed of 40 m/s. The coefficient of friction between the tires and the road is ? = 0.25. If the car maintains a constant speed of 40 m/s, it will
A. attempt to dig into the road surface. B. tend to veer toward the center of the semicircle. C. arrive safely at the end of the semicircle. D. tend to veer toward the outside of the circle. E. veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.
In Figure 7.7, a 5.00-kg block is moving at 5.00 m/s along a horizontal frictionless surface toward an ideal spring that is attached to a wall. After the block collides with the spring, the spring is compressed a maximum distance of 0.68 m
What is the speed of the block when the spring is compressed to only one-half of the maximum distance?