1. a diagram that shows the sun at the center of the solar system is known as a? a) geocentric model. b) heliocentric model. c) universe model. d) earth moon sun model. 2. why do the planets not travel in a straight path? . a) the forces of inertia and gravity cause them to move in a elliptical orbit around the earth. b) the forces of inertia cause the planets to move in curved paths around the sun. c) the forces of inertia cause the planets to move in curved paths around the sun. d) the forces of gravity and inertia combine to produced elliptical orbits around the sun. e) all of above.

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

(a) if the pressure in gas is doubled while its volume is held constant, by what factor do (i) vrms and (ii) change? (b) is it possible to boil water at room temperature (20oc) without heating it? explain.

Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point