Two spheres. labeled I and B. lave identical masses, but are made of different substances. The specific heat capacity of sphere is 140 J/(kg . Cº) and that of sphere B is 160 J/(kg. C). The
spheres are initially at 21 C: and the same quantity of heat is added to cach sphere. If the final
temperature of sphere I is 72 C. what is the final temperature of sphere B?

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Name two kinds of practical electric pumps.

Aprisoner is forced to go into one of three rooms, but he can choose which room. the first room is ablaze with fire. the second one is rigged with explosives that will go off as soon as he enters. the third contains a pair of lions who haven't eaten in years. which room should he choose to survive?