If eclipses occur in repeatable patterns, then explain why an eclipse is not visible from the same place on Earth after one Saros cycle
What will be an ideal response?
Although the eclipse geometry repeats almost exactly, it is not visible from the same place on Earth. The Saros cycle is a third of a day longer than 18 years 11 days. When the eclipse happens again, Earth will have rotated a third of a turn farther east, and the eclipse will occur a third of the way westward around Earth. That means that after three Saros cycles (period of 54 years plus 34 days) the same eclipse occurs in about the same part of Earth.
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Process of Science: The theory of spiral arms explain why short-lived, massive stars are found there but longer-lived, low mass stars should last for many orbits around a galaxy and therefore be much more spread out
How might you test that prediction?
A starship "Alpha" travels at 0.8c past an identical starship, "Beta," which is at rest. Both an engineer on the "Alpha" and a scientist on the "Beta" measure the length of the other ship as it passes by. Who measures the longer length?
A. The scientist B. Both measure the same length C. The engineer D. The measured lengths cannot be compared
Which of these causes a change in the direction of a light ray?
A. reflection B. refraction C. scattering D. All of these are a change in direction of a light ray.
To drive a typical car at 40 mph on a level road for one hour requires about 3.2 × 107 J of energy. Suppose we tried to store this much energy in a spinning, solid, uniform, cylindrical flywheel
A large flywheel cannot be spun too fast or it will fracture. If we used a flywheel of diameter 1.2 m and mass 400 kg, what angular speed would be required to store 3.2 × 107 J? A) 3600 rad/s B) 940 rad/s C) 530 rad/s D) 5500 rad/s E) 1800 rad/s