A 3.50kN piano is lifted by 3 workers at a constant speed to an apartment 25.0m above the street, using a pulley system fastened to the roof of the building. Each worker can deliver 165 W of power, and the pulley system is 75% efficient. Neglecting the mass of the pulley and ropes, find the time for the workers to lift the piano from the street to the apartment window.

no sign of dia of fuel cell

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

answer

a 75kg dining table

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.