Heavy rope, 60 ft long, weighs 0.7 lb/ft and hangs over the edge of a building 130 ft high. (Let x be the distance in feet below the top of the building. Enter xi* as xi.) How much work W is done in pulling the rope to the top of the building?

(a) In ascending order of reactivity:

1. Cesium(Cs)

2. Potassium(K)

3. Lithium(Li)

(b) (i) Reaction of Cesium with water produces:

Colorless basic solution of Cesium hydroxide and hydrogen gas.

(ii) Cesium+Water—>Cesium Hydroxide+Hydrogen

•2Cs + 2H²O —> 2CsOH + H²

(iii) a) toxic and violent reaction

b) catch fire

c) release of a large amount of hydrogen gas

(c) Alkali Metals