Which of the following are relatively unchanged fragments from the early period of planet building in the solar system?
A) the moons of Mars
B) asteroids
C) Kuiper belt comets
D) Oort cloud comets
E) all of the above
E
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Nuclear fusion is the process by which
A) electrons are rearranged inside an atom, releasing energy B) a number of smaller nuclei combine to form a larger nucleus with the release of energy C) an electron is ejected from the nucleus of an atom, releasing energy D) large nuclei break up into smaller nuclei with the release of energy
In a nuclear power plant, the reactor produces 500°C steam that is used to power the steam turbines which generate 1500 MW of electrical power. The cooling tower eliminates the waste heat at 50°C. If the efficiency of the plant were that of a Carnot engine, at what rate would waste heat be vented to the atmosphere?
What will be an ideal response?
Dust particles in a grain elevator frequently have masses of the order of 1.0 × 10-9 kg
If, to a first approximation, we model the dust particles as an ideal gas, what would be the rms speed of such a particle in air at 27°C? The Boltzmann constant is 1.38 × 10-23 J/K . A) 3.5 × 10-6 m/s B) 5.6 × 10-5 m/s C) 7.8 × 10-4 m/s D) 5.2 × 10-3 m/s E) 4.9 × 10-2 m/s
Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the magnetic field midway between the two wires?
A) 1.0 × 10-5 T B) 2.0 × 10-5 T C) 3.0 × 10-5 T D) 4.0 × 10-5 T E) 5.0 × 10-5 T