The geocentric equatorial position vectors, in km, of a satellite at three separate sightings are: r1 = 2800 i + 6000 j + 9000 k r2 = ‒ 3500 i + 227 j + 12400 k r3 = ‒ 13000 i ‒ 7000 j + 9200 k using gibbs method, a) determine the orbit eccentricity b) is the orbit retrograde or prograde? c) what is the perigee altitude of the satellite?

In the sport of parasailing, a person is attached to a rope being pulled by a boat while hanging from a parachute-like sail. a rider is towed at a constant speed by a rope that is at an angle of 15 ∘ from horizontal. the tension in the rope is 1900 n. the force of the sail on the rider is 30∘ from horizontal. what is the weight of the rider? express your answer with the appropriate units.

Which configuration would produce an electric current? a) rotate a coil of copper wire between two magnets. b) connect a wire between a copper and zinc strip sitting in a beaker of water. c) connect a wire to the (+) positive end of a battery and the other end to a light bulb. d) connect a wire to the negative end of a battery and the other end to a light bulb.

The energy of a photon was found to be 3.38 × 10–19 j. planck’s constant is 6.63 × 10–34 j • s. which color of light corresponds to this photon?