There is complete security in their country. neither traveler nor inhabitant in it has anything to fear from robbers or men of violence. they do not confiscate the property of any white man who dies in their country, even if it be uncounted wealth. on the contrary, they give it into the charge of some trustworthy person among the whites, until their rightful heir takes possession of it. they are careful to observe the hours of prayer, and assiduous in attending them in congregations and in bringing up their children to them. - ibn battuta "travels in asia and africa," 1325-1354 using the prompt, which explains why timbuktu became such an important urban center in the mali kingdom? a) advanced weaponry

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.