If steam enters a turbine at 600k and is exhausted at 400k, calculate the efficiency of the engine.

At time t=0, a particle is located at the point (3,6,9). it travels in a straight line to the point (5,2,7), has speed 8 at (3,6,9) and constant acceleration 2i−4j−2k. find an equation for the position vector of the particle.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

How do we measure or think of speed in the united states?