2007 Invitational B

[nsguy1350]

I have a few questions:

44. How is this any different from [unparseable or potentially dangerous latex formula]?

46, 48: Moment of inertia questions. I still don't know how to use moment of inertia, so I will study them. A brief explanation would be appreciated.

53. How do you work out that circuit? I did a circuit like that before, but I have forgotten how to break down weird circuits like that.

55. Time dilation: initially, I got Mary was older by 1.41 years, and I realized I had flipped something. Now, I get that Mary is older by about 1.78 years. Help please?

60. Thermal expansion is always uniform?

[darksaber21]

For number 60, thermal expansion occurs throughout the object. In physics, we assume that heat of an object is distributed throughout, and as such the object will expand (or shrink in this case) uniformly when heat is added (or lost) from the object.

[darksaber21]

For 46, as we are dealing with rotation about a point, the moment of inertia is the sum of all points of mass from the rotation point. As such:

[unparseable or potentially dangerous latex formula]

So for 46:
[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]

[nsguy1350]

[101dalmatians]

IMPOSSIBLE :O::O:O:O:O:O

nsguy1350,
I am crying :'(
YOU HAVE QUESTIONS??????????????????