Write two characteristics each from white phos-phorus and red phosphorus. How one form can be converted to another?

Write main differences between the properties of white phosphorus and red phosphorus.

Write two important ores each from iron & copper.

Two inclined frictioniess tracks, one gradual and the other steep meet at A from where two stones are allowed to slide down from rest, one on each track (Fig. 6.16). Will the stones reach the bottom at the sam time? Will they reach there with the same speed? Explain. Given 0?t = 30°, 0_2 = 60°, and h = 10 m, what are the speeds and times taken by the two stones?

Several electric bulbs designed to be used on a 220V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220V line if the maximum allowable current is 5A?