Example 2-21 depicts the following scenario with the accompanying figures. A hot-air balloon is rising straight upward with a constant speed of 6.5 m/sm/s. When the basket of the balloon is 20.0 mm above the ground, a bag of sand tied to the basket comes loose and reaches a maximum height of 22 mm. (a) If the bag in Example 2-21 had been released at 31.0 mm instead, with everything else remaining the same, would its maximum height be 33 mm, greater than 33 mm, or less than 33 m. 33m
(b) Find the speed of the bag in part A just before it lands when it is released from 31.0 m
(c) Now, suppose the balloon in Example 2-21 is descending with a constant speed of 4.2 m/sm/s when the bag of sand comes loose at a height of 35 mm. What is the amount of time the bag is in the air?
(d) What is the speed of the bag when it is 17 mm above the ground?

-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

hope this

c. newton's third law of motion

b

explanation: