a 2.61 kg block is at the top of a 10.2 m long incline, tilted at 15.0°, with uk = 0.220. what is the block's final velocity when it reaches the bottom of the incline?

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?