There appears to be a correlation between the 22-year solar cycle and:
A) droughts in North America.
B) asteroid impacts on Earth.
C) change of which political party has the majority in the U.S. Congress.
D) the length of Mercury's day.
E) the length of Saturn's year.
A
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The Galactic Year is the time for our solar system to orbit the Galaxy; it is about
A) 15 million years. B) 225 million years. C) 4.5 billion years. D) 9.6 billion years. E) 13.5 billion years.
The lowest energy level in an atom is its __________
Fill in the blank(s) with correct word
A rod attached to the shaft of a motor at the center of the rod so that the rod is perpendicular to the shaft, as in figure a. The motor is turned on and performs work W on the rod, accelerating it to an angular speed ?. The system is brought to rest and the attachment to the rod is then moved along the shaft such that the rod is spun from its end instead, as in figure b. If the controls of the
motor are adjusted such that the rod is accelerated from rest to the same angular speed of ? in this new configuration, how much work does the motor do on the rod in this case?
In the absence of air resistance, a projectile launched at the same speed at any angle will attain the greatest range when projected at
1) 30°. 2) 45°. 3) 60°. 4) 90°. In the case of throwing a heavy spear, not at the same speed but with the same force, the greatest range is attained more likely when thrown at 5) 30°. 6) 45°. 7) 60°. 8) 90°.