What evidence of a chemical change is observed when rust forms on iron

What weight wb will cause the system to be in equilibrium? neglect all friction, and state any other assumptions.?

Ho Chi Minh led the Communist forces in Indochina and in North Vietnam. a. True b. False Hitler and Mussolini headed two of the Axis powers of World War II. a. True b. False

Juan Formababee runs at a speed of 17 mi/hr. How long will it take him to run 13.6 miles?

Which components of the atom have no charge

If the mass of a material is 114 grams and the volume of the material is 16 cm squared 3, what would the density of the material be?

A 62 pound box is on an incline. Determine the minimum force P that would result in the box starting to slide up the incline. (include units with answer)

During a collision with another car, the occupants of a minivan initially travelling at 4.0 m/s come to a complete stop in 0.5 s. What was the acceleration of the occupants of the minivan? a) 8.0 m/s2 b) - 8.0 m/s2 c) 2.0 m/s2 d) - 2.0 m/s2

A system dissipates 12 J of heat into the surroundings; meanwhile, 28 J of work is done on the system.

Charlotte, a 60.0-kg skin diver, shoots a 2.0-kg spear with a speed of 15 m/s at a fish who darts quickly away without getting hit.

All objects are attracted to each other by the force of a. weight. b. mass. c. inertia. d. gravity.