Oil flows upward in the wick of a lantern because of the liquid property called
a. density.
b. meniscusity.
c. viscosity.
d. capillarity.

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.

Explain why electric current cannot exist if a current doesn't have a voltage source.

The energy released by a nuclear fusion reaction is produced when