This is a "thought" question. Why are few galaxies outside our own galaxy seen by our eyes in the circle around the sky where the Milky Way is located? This is because
a. there aren't any galaxies in those directions.
b. dust in the Milky Way blots out our view of galaxies in those directions.
c. the missing mass is in those directions.
d. a massive explosion has blown galaxies away from those directions.
b
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Experienced players can throw a Frisbee so it skips off the ground (the Frisbee’s front edge actually tips upward after the Frisbee hits, enabling it to climb back into the air). If a right-handed player throws a Frisbee in the usual way, it rotates counterclockwise when viewed from above. To skip the Frisbee, which edge has to hit the ground (as seen by the thrower)? (Hint: The Frisbee’s angular momentum vector, and thus its rotation axis, changes in the direction of the external torque that the strike applies to the Frisbee.)
A. The back edge B. The front edge C. The right edge D. The left edge E. The entire rim must hit the ground simultaneously.
Self-Inductance: A coil with a self-inductance of 6.0 H is connected to a dc battery through a switch. As soon as the switch is closed, the rate of change of current is 2.0 A/s. What is the emf induced in this coil at this instant?
A. 6.0 V B. 3.0 V C. 12 V D. 0.33 V E. 0.0 V
Two instruments produce a beat frequency of 5 Hz. If one has a frequency of 264 Hz, what could be the frequency of the other instrument?
a. 269 Hz b. 254 Hz c. 264 Hz d. 5 Hz e. 274 Hz
Two very small plastic balls of equal mass are released from rest. One of them carries +10 µC of excess charge and the other one carries +1µC of charge
No other charges or fields are present. Which of the following statements are true about them as they move away from each other? (There may be more than one correct choice.) A) The acceleration of the 10-µC ball is 10 times that of the 1-µC ball. B) The balls always have accelerations of equal magnitude. C) The speed of the balls keeps increasing. D) The acceleration of the balls keeps increasing. E) The acceleration of the 1-µC ball is 10 times that of the 10-µC ball.