The rectangular plate rotates about its fixed z-axis. At the instant considered its angular velocity is ω = 3.8 rad/s and is decreasing at the rate of 5.8 rad/s per second. For this instant write the vector expressions for the velocity of P and its normal and tangential components of acceleration.

The chemical reactions lab we did is typically called a "copper plating lab,  because the acid solution cleaned the pennies and made the copper look shinier;   the acid solution cleaned the paperclips and made them look like pennies;   &   the copper from the pennies was removed, and then added to the paperclips. 

All u need to do is see how 50cm work with each other