Contrast the densities and compositions of the four Galilean moons
What will be an ideal response?
Closer to Jupiter and dried out by its tides and radiation, Io and Europa are about as dense as our own Moon and made chiefly of rock. But larger Ganymede and Callisto are less stressed, less dense, and have extensive mantles of water and ice above their rock cores.
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Reflecting telescope objectives here on Earth do not have a problem with
a. "seeing". b. diffraction. c. color fringes on the image. d. All of the other choices are correct.
A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared with the force that stops the car, the force needed to stop the truck is
A) greater. B) smaller. C) the same.
Briefly explain how an impact event 65 million years ago could have caused the extinction of the dinosaurs
What will be an ideal response?
Two beams of coherent light start out at the same point in phase and travel different paths to arrive at point P. If the maximum constructive interference is to occur at point P, the two beams must travel paths that differ by
A) an odd number of half-wavelengths. B) a whole number of half-wavelengths. C) a whole number of wavelengths.