Determine whether the velocity field V=2ti + xzj + 4ty2k is incompressible irritations, both or neither

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

How many molecules are present in 3 mols of silicon dioxide (sio2)?

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