At the Three Mile Island reactor
A) meltdown occurred accompanied by a large-scale release of deadly radiation and many deaths.
B) although there was considerable damage, there was never much risk of harm to the nearby population.
C) the reactor melted down but this was accompanied by only a small release of radiation and no immediate deaths.
D) there was only a minor accident.
E) Actually nothing occurred--it was all a hoax.
C
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Which was the last part of the planet-forming process?
A. formation of the planetesimals B. formation of the planets' core C. formation of the atmosphere of the planets D. formation of the Sun
A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
a. -0.64 kJ b. -0.40 kJ c. -0.52 kJ d. -0.28 kJ e. -0.76 kJ
Dark energy is the term used to describe ____
a. the pressure inflating "voids" in the distribution of galaxies b. radiation from antimatter and non-baryonic matter c. a component of the cosmic microwave background radiation d. an effect that works with gravity to decelerate the expansion of the Universe e. an effect that works against gravity to accelerate the expansion of the Universe
Mass Sprectrometer: In a mass spectrometer, a single-charged particle has a speed of 1.00 × 106 m/s and enters a uniform magnetic field of 0.200 T at a right angle to the field. The radius of the resulting circular orbit is 20.75 cm. What is the mass of the particle? (e = 1.60 × 10-19 C)
A. 3.20 × 10-27 kg B. 6.64 × 10-27 kg C. 1.67 × 10-27 kg D. 9.11 × 10-31 kg