Which best compares and contrasts how John Newlands and Dmitri Mendeleev organized elements?
A. Both Newlands and Mendeleev arranged elements according to their chemical properties, but only Newlands used atomic
mass as well
B. Both Newlands and Mendeleev arranged elements according to their atomic masses, but only Mendeleev used chemical
properties as well.
C. Both Newlands and Mendeleev organized elements into groups, but only Newlands used a table with rows and columns
D. Both Newlands and Mendeleev organized elements into a table with rows and columns, but only Mendeleev named different
groups of elements.

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.

How are series and parallel circuits simililar? both have multiple paths for electrons to travel. both require resistors in their circuits. both require a switch to complete the circuit. both have at least one path for electrons to travel.

What is a carrier wave and how does it affect what you hear on the radio