Which of the following materials has the largest conductivity (at 20°C)?
A) copper
B) platinum
C) silver
D) iron
E) glass
C
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A 2000. kg car, traveling to the right at 30. m/s, collides with a brick wall and comes to rest in 0.20 s. The average force the car exerts on the wall is
A) 60. kN. B) 300 kN. C) 600 kN. D) 12. kN. E) 30. kN.
The atomic number and mass number for calcium-39 are 20 and 39, respectively. How many neutrons are in one atom?
A) 1 B) 19 C) 20 D) 39 E) 59
Why do scientists think tiny quantum ripples should have been present in the very early universe?
A) The shock wave of the Big Bang caused ripples that expanded outward with time. B) The energy released when the strong force froze out of the GUT force caused shock waves that produced ripples in the universe. C) Matter and antimatter particles that spontaneously formed from high-energy photons caused disruptions in the radiation field. D) The annihilation of matter and antimatter particles caused tiny explosions that disrupted the radiation field. E) Quantum mechanics tells us that the energy fields at any point in space be continually fluctuating as a result of the uncertainty principle.
Why might the Cassini-Huygens probe to Titan be considered disappointing to exobiologists?
What will be an ideal response?