The Truss Diagonal That Carried More Than the Support Reaction
An inclined truss member can carry more axial force than the vertical reaction component it provides.
Archives: Case Files
The Beam Reactions That Refused to Split 50-50
Support reactions depend on where the loads act. Force balance alone cannot determine the distribution.
The Two Cables That Each Carried 10 kN
Equal load sharing does not mean the inclined cable tension equals half the vertical load.
The Router That Ignored the Shorter-Looking Route
A router can match more than one route. The winner is the most specific matching prefix, not simply the first or broadest entry.
The 1500-Byte Packet That Did Not Arrive in 12 Microseconds
A fast bit rate reduces serialization time, but it does not remove the physical travel time across the link.
The /27 Network That Could Not Fit 40 Devices
A /27 contains 32 addresses, but not all 32 can be assigned to ordinary hosts in a conventional IPv4 subnet.
The Four-Channel FDM Link That Needed 95 kHz
FDM channel bandwidths are not the whole spectrum plan. Guard bands between channels also consume frequency space.
The PCM Link That Needed 64 kbps, Not 32
Analog bandwidth is not the same as sampling rate. A 4 kHz voice signal can produce a 64 kbps PCM stream.
The AM Signal Whose Envelope Pinched Shut
A stronger message signal can break conventional AM envelope detection when the modulation index exceeds 1.
The Higher-Gain Loop That Crossed Into Instability
Higher controller gain can reduce error and still destabilize a feedback loop. The characteristic equation sets the allowable range.