In your job in a police lab, you must design an apparatus to measure the muzzle velocities of bullets fired from handguns. your solution is to attach a wood block of 1 mass m that rests on a horizontal surface to a light horizontal spring. the other end of the spring is attached to a wall. initially the spring is at its equilibrium length. a bullet is fired horizontally into the block and remains embedded in it. after the bullet strikes the block, the block compresses the spring a maximum distance d. you have measured that the coefficient of kinetic friction between the block and the horizontal surface is μk. you want the maximum compression of the spring to be xmax. what must be the force constant of the spring?

less than one you can't create energy

-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

dang that balls went far

i think it would be 5