During a high-altitude low opening (HALO) parachute jump, the skydiver achieves a terminal velocity of 213 km/h and waits to open his chute at an altitude of 688 m, accelerates uniformly (with a negative acceleration), and lands with a speed of 20.7 km/h. (Assume the negative direction is downward.) a) What is the acceleration of the skydiver (in m/s2) after the parachute is opened? (Indicate the direction with the sign of your answer.)
b) How much time (in s) elapses between the opening of the chute and the landing?
c) Originally developed for the military, HALO jumps are now part of the burgeoning sport of speed skydiving, in which the skydiver attempts to achieve a very high terminal velocity by diving head-first instead of the traditional belly-to-earth posture. Skydivers have been known to reach a terminal velocity of 462 km/h in this manner. If 5g is the greatest magnitude of acceleration for which the skydiver can remain conscious, what is the minimum altitude (in m) at which the chute must be opened in such a jump, if the skydiver wants to land on the ground at 20.7 km/h?

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

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igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods