1. In the sport of curling, teams try to slide a 20kg stone as close as possible to the center of a target. They do this by first pushing the stone, releasing it, and then allowing it to slide to a stop
(or hit another stone). If the ice has a coefficient of friction of 0.02, what is the acceleration of
the stone as it is sliding (after it is released)? ( -0.196m/s2)
show work.

The us government wants to allocate billions of dollars in the next 10 years to assure our future energy security. the funds will be spread among a variety of possible energy resources. where do you think the government should put the greatest support: solar energy, wind energy, clean coal, oil exploration, gas exploration, or a combination of sources? are there other efforts that should be explored? support your position with cited information for both questions.

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?