James asks…
How do astronomers know/think that the universe extends infinitely in all directions?
It is also thought that time is infinite in both directions, right? Always has been, always will be. How are these two conclusions arrived at?
Nagesh answers:
Astronomers know things are moving in certain directions by viewing the shift in their visible light spectrums under the Doppler effect. The problem with the “infinite universe” theory is that astronomers believe the universe is infinite simply because they don’t see the end of it. Anyone that has been on a boat in the middle of the ocean, looking for land on the horizon knows this is faulty logic. Just because you can’t see the end of something doesn’t mean it is there.
Lizzie asks…
Why is it important to follow standardized directions? Looking for an activity that would demonstrate this?
I’m giving an inservice on CBM procedures and want to stress the importance of using the standardized directions. People don’t seem to see the importance of this and when you give them statistics and whatnot they fall asleep. If I had an activity where different people recieved different directions it might make the point. I’ve been thinking but haven’t come up with anything yet.
Nagesh answers:
OK, here, draw a road on A HUGE piece of paper. With 2 roads with lots of twists and turns, make road “a” lead to the campsite for say, and make road “b” lead to oncoming traffic in the opposite lane.
Choose 4-6 people
give each person an individual piece of paper with directions on it.
Example: (1.) look at the road, and find 2 possible ways to get to the campsite. (2). Turn right onto route 66. (3) turn right
(4) keep following traffic until you get to the intersection (7) keep going.
These directions should lead to the campsite.
Now have the 5 people give u the directions, then have then retake this activity, making sure they take the road that looks to be faster, a.k.a the one that will end them up in oncoming traffic
the point of this being not taking the standardized directions will get u in a load of shit.
Hope it helped
Mary asks…
Two people pull a sled in opposite directions on frictionless ice. What is the sled’s acceleration magnitude
Two people pull with a 90 N and 92 N in opposite directions on a 25 kg sled on frictionless ice. What is the sled’s acceleration magnitude? Show your work and good luck 🙂
Nagesh answers:
As the forces are in opposite directions, the resultant force will be eqal to the difference of forces and takes place in the direction of the larger force.
92N-90N=2N
F = ma
a =F/m=2/25= .08 m/s^2
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Thomas asks…
How did some astrologers succesfully predict their own death?Did they use Primary Directions?
I know that primary directions is a very old method,in which you direct the Hyleg to a malefic planet to see the date of death,but are there any more details about this?
Nagesh answers:
I think many use the primary directions, but also don’t dismiss the solids, like progressions, returns, and transits. Usually there will be a continuous statement in all the charts. Some like to use solar arcs, but I don’t personally find they work well on their own, but certainly with other charts.
Mark asks…
How many different directions in space am I travelling in?
Sitting on my sofa at home… How many different directions would I be moving in, relative to the nearest galaxy?
And what kind of speeds are we traveling at?
Thanks… 🙂
Nagesh answers:
By defining “relative to the nearest galaxy”, I will assume you mean Andromeda (the nearest large spiral galaxy), not one of our satellite galaxies.
If we isolate your motion into separate vectors, there are 3:
1. The Earth is rotating at 465 m/sec – this is counter-clockwise (looking down over the north pole)
2. The Earth is orbiting the sun at an average of 29,783 m/sec (again, counter-clockwise)
3. The sun is orbiting the galactic centre at 220,000 m/sec (this motion is in the direction of the star Vega in the constellation Lyra, which is away from constellation Andromeda and the Andromeda Galaxy)
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