Which of the following is a technique that can be used to speed up a spacecraft without the need for extra fuel?
A) a gravitational slingshot, in which the spacecraft gains momentum by flying near a planet
B) releasing unnecessary weight after takeoff to make the spacecraft lighter
C) flattening after takeoff to make the spacecraft more aerodynamic
D) landing on a fast-moving asteroid and relaunching at high speed
E) collect material in space that can power the spacecraft
A) a gravitational slingshot, in which the spacecraft gains momentum by flying near a planet
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An atomic model of the atom is
A) a symbolic representation of the atom. B) a stepping stone to further understanding. C) an abstraction enabling predictions. D) all of the above
Will Pluto eventually collide with Neptune?
A) No, because Pluto's orbit is completely inside Neptune's orbit. B) No, because Pluto's orbit is completely outside Neptune's orbit. C) No, because the two planets have an orbital resonance that prevents them from colliding. D) No, because Pluto's orbit never comes anywhere close to Neptune's orbit. E) Yes.
When an unstable nucleus decays by emitting an alpha particle, the atomic mass number A of the nucleus
A) increases by 4. B) increases by 2. C) decreases by 2. D) decreases by 4. E) remains unchanged.
What is the first step in treating raw sewage?
A) filtration of solids B) removal of fine particles by settling C) removal of grit by settling D) removal of sludge E) disinfection