A1800-kg spacecraft is in a 700x1200 km altitude earth orbit. a spacecraft has a re-startable onboard propulsion system with a thrust of 12kn and specific impulse of 275s. assuming the thrust vector remains aligned with the velocity vector and that the burn time is 75 seconds, determine: a) mass of propellant expended b) eccentricity of the new orbit c) the new apogee altitude

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

Asher cycles 12 miles in 16 hours. what is his speed?

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?