At the same time that the first arrow is dropped, a
second arrow is shot from a height of 5 ft with an
initial vertical velocity of o ft/s, but a horizontal
velocity of 100 ft/s. when does the second arrow
hit the ground, assuming it does not hit anything
else first? ignore the effects of air resitance.

Asystem containing an ideal gas at a constant pressure of 1.22×10^5 pa gains 2140 j of heat. during the process, the internal energy of the system increases by 2320 j. what is the change in volume of the gas?

What component of earth’s atmosphere exists entirely as a result of photosynthesis?

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?