Are energy transformations always efficient

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 cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?