The number of comets in the Oort cloud is probably about
A) a thousand.
B) a million.
C) a billion.
D) a trillion.
E) a quintillion.
D
You might also like to view...
The type of radiation that fogged Becquerel’s photographic plates was probably
A. Alpha radiation. B. Beta radiation. C. Gamma radiation. D. Either alpha or beta radiation. E. Either beta or gamma radiation.
In the context of the mass-luminosity relation, a star with a mass of 2 solar masses on the main sequence would have a luminosity of approximately _____ solar luminosities
A) 2.5 B) 4 C) 11 D) 0.5
A very light ideal spring of spring constant (force constant) 2.5 N/cm is 15 cm long when nothing is attached to it. It is now used to pull horizontally on a 12.5-kg box on a perfectly smooth horizontal floor
You observe that the box starts from rest and moves 96 cm during the first 1.6 s of its motion with constant acceleration. How long is the spring during this motion?
A coil lies flat on a tabletop in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?
A) There is no induced current in this coil. B) The induced current flows clockwise. C) The induced current flows counterclockwise. D) The current flows clockwise initially, and then it flows counterclockwise before stopping.