Identify the chemical change below a) a piece of wood burns in a fire b) two pieces of paper are stapled together c) water is removed by drying wet clothes on a laundry line d) a large log is cut into boards

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

A2000 kg car is rounding a curve of radius 200 m on a level road. the maximum frictional force the road can exert on the tires of the car is 4000 n. what is the highest speed at which the car can round the curve?

Which branches of natural science include the study of an organism that lived 10 million years ago