Which of the following statements about comets is true? a. comets rarely fall into an orbit around the sun. they usually enter the inner solar system only once and then are gone forever. b. most comets have a circular orbit that keeps them in the space between mars and jupiter. c. comets have very elliptical orbits that usually take them far beyond the orbit of pluto, but also take them closer to the sun than earth. d. comets have very elliptical orbits that usually take them closer to the sun than earth, but rarely do they get further away than pluto.

Asample of a gaseous substance changes into a liquid

Occurs when an energy source transfers heat directly to another subject space; an example would be an object becoming warm by sitting in the sunshine

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?