Aman of mass 80.0 kg stands on a platform of mass 40.0 kg. he pulls on a rope that is fastened to the platform and runs over a pulley on the ceiling. with what force does he have to pull in order to give himself and the platform and upward acceleration of 1.0 m/s²?

Which of the following changes will increase the capacitance of a parallel-plate capacitor? (there could be more than one correct choice.) a) increase the charge on the plates b) decrease the poten5al between the plates c) increase the potential between the plates d) introduce a dielectric material between the plates e) decrease the separation between the plates