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When a 3-dimensional (solid) object is cut by a plane, the 2-dimensional shape made where the solid object and the plane meet is the cross section.
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What four things can determine an object's resistance?
nature of material(resistivity),length of material,area of crosssection&temprature
What do control rods in a reactor contain?
The 2 most common materials are cadmium or boron, due to their large neutron absorption crosssection.
What is the crosssection perpendicular to the base of a triangle?
A triangle does not have a cross-section but the perpendicular line of a right angle triangle meets the base at 90 degrees.
Why Fluid Speed Increases in the Divergent Portion of a Convergent-Divergent nozzle?
Because the fluid is allowed to expand in the nozzle it increases velocity to fill in the voids created by the shape of the nozzle. The convergent point of the nozzle acts like a bottleneck trying to slow the fluid and compress it into the reduced crosssection of the nozzle. As it leaves the minimum crosssection it expands into the divergent spaces of the nozzle increasing in velocity as it expands. ++_+ No: it gains velocity through the convergence but in the diverging section, trades velocity for pressure.
How can the radioactive nuclide plutonium 239 be prepared using nuclear equations?
U238 + n --> U239 : capture, crosssection 2.73 barnsU239 --> Np239 + e- : beta decay, half-life 23.5 min.Np239 --> Pu239 + e- : beta decay, half-life 2.33 days
What is the current carrying capacity amps of CAT6 cable?
It is around 12.5 Amps, assuming the crosssection of one strand of cat 6 is of .5 sq mm and four strands are twidted together.
How does a sponge's body plan show that it is a very primitive animal?
It has a single layer of cell. Lay a paper on a flat surface. With your hands on the surface, push two sides together until you make something that looks like a polyp. Voila! Something similar to a crosssection of a sponge. Think of the paper as cells in a single line.
What part of the reactor is used to control the speed of the nuclear reaction how does it work?
Boron and/or Cadmium control rods. They are inserted into the core to slow the reaction and withdrawn from the core to speed up the reaction. Both elements have a very high neutron capture crosssection, the more in the core the more excess neutrons they remove from the chain reaction.
How can the rate of reaction be slowed down in a nuclear fission reactor?
By inserting the control rods which absorb neutrons using boron, cadmium, or other material with a large neutron capture crosssection. If the reactor should begin to run out of control the SCRAM system will suddenly insert large amounts of neutron absorbing material, instantly stopping the neutron chain reaction.
How does EU affect businesses?
Recent economic analysis in both Europe and the United States has shown that potential competitiveness impacts are in reality likely to be small in the short term . This report presents qualitative evidence that backs up the analysis in these studies, based on interviews with a crosssection of leading, trade-exposed companies . Most of the respondents are energy-intensive companies with significant emissions in Europe covered by the European Union Emissions Trading System.
Why are sponges considered to be more primitive than cnidarians?
It has a single layer of cell. Lay a paper on a flat surface. With your hands on the surface, push two sides together until you make something that looks like a polyp. Voila! Something similar to a crosssection of a sponge. Think of the paper as cells in a single line.
What are solid electrical cables and there applications?
A given crosssection or diameter of the conductor can be obtained by a single strand wire or with many smaller diameter wires put together. For example a 4 sqmm wire can be one solid wire of 4sqmm or can comprise many smaller diameter wires twined together. A solid wire is more rigid whereas multistrand wire is flexible. A solid wire may not need a terminating lug, whereas a multistrand wire needs a terminal lug for termination / connection to a terminal block
