A scientific theory must produce testable predictions that are then evaluated when data are available. Describe at least two predictions of the nebular theory that can be tested through observations of other planetary systems.
What will be an ideal response?
Answer: Possible answers include: Planets should be common around other stars; most or all planets should orbit in the same direction and nearly the same plane around their star; rocky worlds should be closer to their stars and icy worlds farther away; all planetary systems should have "leftovers" like asteroids and comets.
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In the formula E = mc2, what does E represent?
A) the mass-energy, or potential energy stored in an object's mass B) the kinetic energy of a moving object C) the radiative energy carried by light D) the gravitational potential energy of an object held above the ground E) the electric field produced by a charge
In Figure 6-1, the block of mass m is at rest on an inclined plane that makes an angle ? with the horizontal. The force of static friction f must be such that
A) f > mg. B) f > mg cos?. C) f > mg sin?. D) f = mg cos?. E) f = mg sin?
An automobile of mass 2000 kg moving at 20 m/s is braked suddenly with a constant braking force of 10,000 N. How far does the car travel before stopping?
a. 40 m c. 120 m b. 80 m d. 160 m
Which of the above molecules is a phenol?
A) a B) b C) c D) d E) a and d