Stars that are visible in the local sky on any clear night of the year, at any time of the night, are called ________
A) seasonal B) bright C) celestial D) circumpolar
D
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Electrons are used to produce X-rays by allowing a beam of electrons to strike a heavy metal surface. When the speeds of the electrons in the beam is increased, this results in:
A. X-rays being produced having higher energies B. X-rays having longer wavelengths being produced C. Faster X-rays being produced D. More X-rays being produced per unit time
The astronomical object in our sky which is directly connected to the tides is the
A) Sun B) Moon C) nearest star D) most massive planet in our solar system, Jupiter
Which of the following is TRUE?
A. We see distant galaxies as they were billions or even tens of billions of years ago. B. We measure a redshift for roughly half of the galaxies that we observe, and for the others we measure a blueshift. C. It is possible for galaxies that are very distant to actually move through space at a speed several times the speed of light. D. A redshift occurs when a photon loses energy and slows down as it moves through space. E. The center of the universe is located at a point about 200 Mpc from us in the center of a cluster of galaxies.
Suppose that a Ferrari and a Porsche begin a race with a moving start, and each moves with constant speed. One lap of the track is 2 km. The Ferrari laps the Porsche after the Porsche has completed 9 laps
If the speed of the Ferrari had been 10 km/h less, the Porsche would have traveled 18 laps before being overtaken. What were the speeds of the two cars?