Abucket of water of mass 10 kg is pulled at constant velocity up to a platform 30 meters above the ground. this takes 10 minutes, during which time 4 kg of water drips out at a steady rate through a hole in the bottom. find the work needed to raise the bucket to the platform. (use =9.8m/s2.)

Atotal charge of –6.50 µc is uniformly distributed within a sphere that has a radius of 0.150 m. what is the magnitude and direction of the electric field at 0.300 m from the surface of the sphere? a) 2.89 × 105 n/c, radially inward b) 6.49 × 105 n/c, radially outward c) 4.69 × 105 n/c, radially inward d) 9.38 × 105 n/c, radially outward e) 1.30 × 106 n/c, radially inward

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles

How would a small bar magnet be oriented when placed at position x?