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3h
comment Radiation from home heaters
Are you asking whether the radiation from home heating units causes radioactive contamination to build up in your house?
Jul
1
comment Reduction of Earth's Rotation due to increase in humidity
But the atmosphere is not a rigid body. If the atmosphere rotates more slowly than the earth, then the earth's rotation might have to actually increase to conserve angular momentum.
Jun
25
comment How to design a stable table?
You need to define what constraints you want to place on the design. For example, a round tabletop with no leg and no base would be extremely stable. Or, if your base is larger than your tabletop, that will be extremely stable.
Jun
23
comment Good way to compute the force of a hammer blow?
What about pressure? Are you interested in measuring the difference between a hammer with a large striking area vs a hammer with a small area?
Jun
8
comment What is the voltage at every pair of points along a ideal wire that is connecting the two terminals of a battery?
For any segment of idealized wire, consider the voltage anywhere along the segment to be constant. In your game, you will need to separately handle the edge case where a wire shorts out a battery.
May
28
awarded  Yearling
May
27
awarded  Editor
May
27
revised Is there a huge difference between centrifugal and centripetal forces?
added 1 character in body
Apr
30
answered Is there a huge difference between centrifugal and centripetal forces?
Apr
29
comment Does a truck stop faster if the stack on the back of truck is stable or if it moves forward?
This analysis assumes that the moving haystack eventually stops due to friction. If instead the haystack stops due to colliding with the cab of the truck, does that change the answer? Also, would the timing of the collision matter (whether the haystack hits the cab before or after the truck comes to a stop)?
Mar
31
comment In circular motion, with a constant distance, why does the mass of the orbitting object have no effect on its revolution at all?
FYI - the orbiting object's mass does have an effect on the shape of the orbit. For example, if you increased the mass of the moon such that it had the same mass as the earth, the moon would no longer follow a circular path with the earth near its center. Instead, the moon and earth would both orbit around a point halfway between them. See barycentric coordinates.
Feb
16
comment Why does it take a projectile as long to get to its apex as it does to hit the ground?
This is probably the easiest way to explain it to someone in an intro to physics class, as long as you are able to convince the student that v(final) = -1 * v(initial).
Sep
24
comment Did the Big Bang happen at a point?
"The simple answer is that no, the Big Bang did not happen at a point. Instead it happened everywhere in the universe at the same time." By this, do you mean 1) that only the spacial dimensions were collapsed, but time was not, so the Bing Bang occurred at one moment in time, or 2) was all of spacetime collapsed, and the Big Bang occurred everywhere and every time.?
Sep
21
comment If a body is floating in a static fluid, then the volume of the displaced fluid equal to the volume of the inmerse part of the object (proof)
You can't mathematically prove this without first making certain assumptions, and making rigorous mathematical definitions of the physical concepts. Math doesn't know what a "static fluid" is, for example. Another example of where assumptions matter is the fact that not all volumes are additive.
Sep
10
awarded  Teacher
Sep
10
answered If gravitation causes constant acceleration why moon does not fall into earth?
Sep
9
comment Should I abandon my thought experiment about time?
@brightmagus - " the light coming from the clock must travel a longer distance to reach my eye as it moves away. This would make time appear to slow down? If, on the other hand, the clock is moving towards me, the distance the light must travel to reach my eye becomes shorter and shorter, thus time would appear to speed up?" The OP seemed to be concentrating on the distance being the cause, not the relative velocity. But we'll never know unless the OP comes back to comment.
Sep
9
comment Should I abandon my thought experiment about time?
@brightmagus - According to your own example, the clock ticks are observed at 2s, 4s, 6s, etc. So the time interval between each observed tick is a constant 2 seconds, no matter how far away the clock moves. Everyone agrees that the clock appears to be ticking slower than 1 tick per second. What I was saying is that it doesn't slow down more and more as the distance increases - the time between ticks is constant when the velocity is constant.
Sep
9
comment Should I abandon my thought experiment about time?
@brightmagus - Assuming 1 tick per second (in clock's reference frame), between each click the clock moves v * 1 second further away than where it was at the last click. So, the time difference between the two clicks is (1 second + v/c), which is constant.
Sep
9
comment Should I abandon my thought experiment about time?
Your intuition is about the doppler shifting of the clock ticks is incorrect. I believe that you think the perceived interval between ticks will increase as the clock moves further away, but it won't. The interval will increase as the velocity increases, but once the final velocity is reached, the interval will remain constant.