Why cant halleys comet be seen from earth only for about one year of its 76-year orbit

How would doubling the made of an object change the objects potential energy

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Aparticle moves in the xy plane with constant acceleration. at time zero, the particle is at x = 6 m, y = 8.5 m, and has velocity ~vo = (9 m/s) ˆı + (−2.5 m/s) ˆ . the acceleration is given by ~a = (4.5 m/s 2 ) ˆı + (3 m/s 2 ) ˆ . what is the x component of velocity after 3.5 s? answer in units of m/s.