Diameter Definition and 508 Threads

hey guys, I'm new to physics .. and to be frank it seems scary. :-p anyways i was wondering if anyone could help me with this: The diameter of milky way is 1.0 *10^5 lightyears (ly). The distance to Andromeda is about 2.0 million ly. If a scale model represents the milky ways and andromeda...

I'm having trouble with this problem below: 1000 cm^3 of oil is spilled onto a smooth lake. If the oil spreads out uniformly until it makes an oil slick just one molecule thick, with adjacent molecules just touching, estimate the diameter of the oil slick. The diameter of the oil molecules...

I would like to calculate the new diameter and thickness of a steel pipe filled with water. At 20oC the pipe ID is 0.1016m and thickness is 0.0127m. Coef vol th exp water 21e-5/oC coef lin th exp steel 1.2e-6 The pipe can be assumed 1m in length. I calculated that the water would expand...

i found this in a quarry, it is round approx 3 inches diameter 1.25 inches thick, concave both faces and has raised dimples on the side 180% apart, any ideas? i also found a smaller one identical description but only .75 inches diameter.

Simple Question: Volume --> Diameter I know how to find volume using diameter, but how do you find diameter using volume?

Tried this problem for about 2 hrs and no dice... A spy satellite orbiting at 150 km above the Earth's surface has a lens with a focal length of 3.5 m and can resolve objects on the ground as small as 36 cm; it can easily measure the size of an aircraft's air intake. What is the effective...

I can understand that given a star's mass, composition, age, temperature, etc. it could be relatively straightforward to calculate it's size. But do the big telescopes have enough resolution to directly measure a star's size? Or does it have to be calculated from distance, spectrum, and...

How many revolutions per minute would a 15m diameter Ferris wheel need to make for the passengers to feel weightless at the topmost point?