What is the magnitude of the acceleration of a speck of clay on the edge of a potter's wheel turning at 50 rpm (revolutions per minute) if the wheel's diameter is 38 cm ?

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2. a. 9.5 m b. 11.9 m c. 15.2 m d. 23.8 m