November 21, 2009 / Physics
Alex M asked: Space probes communicate with controllers on Earth using radio waves. Suppose a probe has a radiotransmitter that operates at a frequency of 388.0 MHz when at rest relative to the observ
November 12, 2009 / Physics
Ben asked: Like in movies...When traveling in outerspace, If it were possible to reach light's speed in a spaceship, how would they avoid running straight into a blackhole, asteroid, planet, Star, or
October 22, 2009 / Physics
pantera_3_27 asked: A rope of length 3.8 meters has a mass of 1.2 kilograms. The rope is stretched so that the tension in the rope is 3.0 Newtons, and waves of wavelength 5.4 meters are seen traveling
October 16, 2009 / Physics
j88k asked: A string of length L vibrates at its fundamental frequency. The amplitude at a point (1/4) L from one end is 6.00 . What is the amplitude of each of the traveling waves that form this sta
August 23, 2009 / Physics
aaron g asked: I had just read that the closest galaxy to ours is 1.6 million light years away and that there are something like 200 billions galaxies. Is this correct information? Also, about how man
August 5, 2009 / Physics
jaxpilot11 asked: If you started in New York, how fast do you have to travel westbound to stay ahead of nightfall? At what speed does "dark" move across the land? I assume it would be slower at the
July 8, 2009 / Physics
smalltown5 asked: A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to t
April 10, 2009 / Physics
Miguel asked: There is a dome traveling at the speed of light. And a car is inside the dome traveling at a rate of 20 km/hour. What is the speed of the car? It cannot be speed of light+20 km/hr right?
