The composition of sedimentary rock shows the source of sediment that makes up rock. Which of the following is a type of sedimentary rock that forms from once-living plants and animals? * A. Sandstone
B. limestone
C. calcite
D. quartz

Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.