In a common but dangerous prank, a chair is pulled away as a person is moving downward to sit on it, causing the victim to land hard on the floor. suppose the victim falls by 0.40 m, the mass that moves downward is 61.0 kg, and the collision on the floor lasts 0.0820 s. what are the magnitudes of the (a) impulse and (b) average force acting on the victim from the floor during the collision?

Given the relationships,

Given the energy conservation equation,

Since this is the initial speed and according to the problem, the final is zero,

\vec{J}=m(\vec{v}_f-\vec{v}_i)

B) The average force would be given by the change that exists at the time during the change of time,

answer; (d) spontaneous processes are characterized by the overall conversion of order to disorder;

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.