Q. Three astronauts, propelled by jet backpacks, push and guide a 120 kg asteroid toward a processing dock, exerting the forces shown in the figure, with F1 = 32 N, F2 = 55 N, F3 = 41 N, θ1 = 30°, and θ3 = 60°. What is the (a) magnitude and (b) angle (measured relative to the positive direction of the x axis) of the asteroid's acceleration?
Q. What must the charge (sign and magnitude) of a particle of mass 1.40 be for it to remain stationary when placed in a downward-directed electric field of magnitude 670?
Use 9.81 for the magnitude of the acceleration due to gravity.