Why are nuclear engineers concerned about neutron embrittlement in fission power plants?
What will be an ideal response?
Steel is used extensively in reactors to withstand the high pressures internal to the
reactor. Embrittled steel cracks more easily. High pressures and cracks are a combination
that can give an engineer nightmares.
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Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. What is their separation after the heavier astronaut has moved 12 m?
A) 9.0 m B) 16 m C) 21 m D) 24 m E) 28 m
The Oort Cloud is believed to have been formed by:
A) planetesimals that were flung far from the Sun in gravitational encounters with the jovian planets. B) icy bodies formed between stars that have been captured by our solar system's gravity. C) moons that escaped from the jovian planets. D) debris from an icy planet that broke apart early in the solar system's history. E) debris from impacts of planetesimals, asteroids and comets with the jovian planets.
If 480 C pass through a 4.0-? resistor in 10 min, what is the potential difference across the resistor?
a. 3.6 V b. 2.8 V c. 2.4 V d. 3.2 V e. 5.0 V
Solenoid: An ideal solenoid 20 cm long is wound with 5000 turns of very thin wire. What strength magnetic field is produced at the center of the solenoid when a current of 10 A flows through it? (?0 = 4? × 10-7 T ? m/A)
A. 0.0063 T B. 0.20 T C. 3.2 T D. 4.8 T E. 0.31 T