Potassium is a solid phase of potassium still unknown to science. The only difference between it and ordinary potassium is that Potassium forms a crystal with an fcc unit cell and a lattice constant . Calculate the density of Potassium . Round your answer to significant digits.

Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1

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

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?