A thin copper rod 1.5 m long has a mass of 0.070 kg and is in a magnetic field of 0.20 T. What minimum current in the rod is needed in order for the magnetic force to balance the weight of the rod

The crank oa rotates in the vertical plane with a constant clockwise angular velocity ω0 of 5.6 rad/s. for the position where oa is horizontal, calculate the force under the light roller b of the 10.6-kg slender bar ab.

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?