27. if you throw a 1.0 kg ball straight up at 40 m/s off the ground, what is its velocity at the highest point? use
conservation of energy to determine how high does the ball go?

The height of the ball, h = 81.63 m

The velocity of the ball at the highest point is zero

Explanation:

Given data,

The mass of the ball, m = 1 kg

The initial velocity of the ball, u = 40 m/s

Using the conservation of energy, the total mechanical energy of the ball initially at u = 40 m/s

              E = P.E + K.E

               E = 0 + ½ mv²

                   = ½ x 1 x 40²

                   = 800 J

The maximum height the ball reaches with the energy E = 20 J

The K.E of the ball is zero at the maximum height

                      E = mgh

                       h = E / mg

                          = 800 / (1 x 9.8)

                           = 81.63 m

The height of the ball, h = 81.63 m

The velocity of the ball at the highest point is zero.

-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

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table