Recent content by racshot65

Homework Statement Show that set S = {(x , y, z ) | x + 2y − z = 0} is a subspace of Real Numbers^3. Homework Equations A subspace needs to be closed under addition and scalar multiplication The Attempt at a Solution S = { (x, y, x+2y) | x, y are elements of Real Numbers }...

Hi, I'm reading about the discovery of the cosmic microwave background radiation and don't understand this part ... What power does a source called with liquid helium produce and how is it related to the amplifier circuits ? I don't get what they did and why ? Thanks !

Hi, I'm slightly confused about how we see other galaxies in the night sky ... Looking at this image of the milky way and our position Why does the milky way look like a streak across the night sky like this http://en.wikipedia.org/wiki/File:Milkyway_pan1.jpg" If we...

Hi, I'm struggling to understand how to approach set theory equality questions for example: True or false? (A n B) is a subset of (A u B) Is quite simple as its obvious the intersection will contain everything that is in the union But what about a more complex question like ...

So just to confirm my understanding ... At the initial moment it starts moving at a right angle to us sideways it has no velocity in that direction, hence it is no further away so there is no Doppler shift However later on in time it gets further away from its initial position and is no...

I don't see how this is, consider this example If the star moves sideways 2cm it gets 0.4cm further away from us ? What am I not understanding ? Thanks :)

Hi, I'm reading "The First Three Minutes" by Steven Weinberg And am confused about this paragraph... "Astronomers are able to measure the motion of a luminous body in a direction directly along the line of sight much more accurately than they can measure its motion at right angles to...