I really need a hand here! A boat has a displacement of 4 km.

If north is taken as the positive direction, which option correctly describes the displacement of the boat?

1. The boat is north of its starting position but is moving toward the south.
2. The boat is south of its starting position but is moving toward the north.
3. The boat is north of its starting position.
4. The boat is south of its starting position.

Along, straight wire with 3.0 a current flowing through it produces magnetic field strength 1.0 t at its surface. if the wire has a radius r, where within the wire is the field strength equal to 36.0% of the field strength at the surface of the wire? assume that the current density is uniform throughout the wire

The act of moving from one place to another. a. locomotor b. aerobic c. stationary d. static

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)