Asian astronomers ________.
A. devised ways to predict eclipses
B. recorded the existence of sunspots
C. kept detailed records of unusual celestial events
D. All of these choices are correct.
Answer: D
You might also like to view...
Waves on a String: A 15-m rope is pulled taut with a tension of 140 N. It takes 0.545 s for a wave to propagate along the rope. What is the mass of the rope?
A. 1.7 kg B. 2.1 kg C. 2.8 kg D. 5.1 kg E. 3.2 kg
Quantum uncertainties are most predominant for simultaneously measuring the speed and location of
A) a baseball. B) a spitball. C) an electron. D) none of the above
A water wave is an example of a transverse wave
Indicate whether the statement is true or false
What is the net force on a 10-kg solid steel sphere falling in air at terminal speed?
A. 980 N B. 200 N C. 98 N D. 49 N E. Some value other than those given above.