3,351 reputation
1713
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location San Mateo, CA
age 59
visits member for 3 years, 3 months
seen 3 hours ago

6h
comment Could two identical stars revolve around each other in a common orbit if we only account for Newtonian physics?
You are being ill-served by the remark that the earth revolves around the sun. That implies that there has to be something there to revolve around. In fact, all bodies of the solar system revolve around the common center of mass. Since the sun is so massive, it approximates the center of mass, which is where the remark comes from. Jupiter is about $1/1000$ the mass of the sun, so the sun-Jupiter CM is $1/2$ million miles from the center of the sun, which is slightly outside the sun. Does that meet your "observed?
12h
comment Calculate the current in mA which will be flowing through the two resistors
You only list three resistors. There is no mention of a resistor in series. You are asked to calculate the current in the "other two resistors", the $3 \Omega$ and $5 \Omega$ ones.
12h
answered Calculate the current in mA which will be flowing through the two resistors
12h
comment can we get electrical energy from gravitational energy?
Note that a retrograde orbit does not have any higher orbital speed than a standard orbit. It will have a higher speed relative to the surface or the ambient magnetic field, but not a whole lot for a low orbit satellite. It is probably not worth the extra work of getting to a retrograde orbit.
1d
revised How do heated showers/faucets work?
correct typo
1d
comment How do heated showers/faucets work?
Yes, there is a water heater with a tank that keeps the water heated. Typical US home ones are 30-50 gallons (120-200 litres). Typical temperatures are 120-140F (49-60C). When you turn on the hot water, it takes a while to get hot because the water stored in the pipe between the heater and the shower has cooled.
1d
answered How do heated showers/faucets work?
2d
comment How to measure rainfall? And how is it determined for a specific location?
50 miles is an enormous distance. Near San Jose, CA, we have places within 20 miles that average 10 and 80 inches per year. Think Kauai, HI, which has Mount Waialeale, the "wettest place on earth" averaging 462 inches per year, while Poipu averages 30-40 inches per year. To my eye they are about 15 miles apart.
Jul
22
comment Potential Energy and Kinetic Energy
What are your thoughts? Have you looked in your book or done a search? You should find equations for some of these. Where are you stuck?
Jul
22
revised Why do bubbles make a sound?
add info
Jul
22
answered Why do bubbles make a sound?
Jul
21
answered Momentum acceleration in space?
Jul
19
comment Possible intergalactic celestial objects
My point is that I think all of these can be ejected from galaxies, but some will be hard to see at long distance. For weakly bound ones, you need to make sure that the tidal forces do not disrupt the system. When you do that, you may lose the outer reaches, but you may eject enough to count as whatever category you are interested in. Certainly we can't see asteroids outside the galaxy.
Jul
19
answered Possible intergalactic celestial objects
Jul
18
comment How to measure rainfall? And how is it determined for a specific location?
It varies a lot. In general, a heavy storm will be heavy over a wide region. In some places rain is quite localized-you should see what happens where you are interested. Even once you get a rain gauge there are issues-trees, overhanging roofs, etc. I have no clear spot in my yard to set one up. You also have to worry about the effects of rain not falling vertically-it often doesn't.
Jul
18
answered How to measure rainfall? And how is it determined for a specific location?
Jul
15
comment About star groupings and there apparent positions in the sky
@user128932: this is a question without any content. We make constellations based on how the sky appears today. The boundaries were roughly established thousands of years ago, then were carefully codified much later. If one star disappears, we won't redraw the boundaries, we will just write papers about the disappearance.
Jul
13
answered Is it possible to change units in order to simplify the value of an exponential?
Jul
13
revised Calculate vertical distance using acceleration
add info
Jul
13
answered Calculate vertical distance using acceleration