Calvin & Hobbes, 45 kg, are sleigh riding down a hill. The hill they are on is irregular shaped,
slopes up and down and has snow of varying depths and textures. Below is a force vs time graph
of the force acting on their sled. The initial velocity when they hit the part of the hill
depicted on the graph at 11
m
/s.

Iron reacts with sulfur to form iron sulfide. if 60 grams of iron reacts with sulfur to produce 90 grams of iron sulfide, how much sulfur has been used in the chemical reaction?

The desk has a weight of 75 lb and a center of gravity at g. determine the initial acceleration of a desk when the man applies enough force f to overcome the static friction at a and b. also, find the vertical reactions on each of the two legs at a and at b. the coefficients of static and kinetic friction at a and b are ms = 0.5 and mk = 0.2, respectively

How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8