Derive the magnitude of the upward force, F at distance L, necessary to hold the plank as in the diagram at the top right. Express answers I’m terms of M, m1, m2, and g.

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 a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;

answer: the potential energy decreases from 379 j to 243 j

explanation:

for the law of conservation of energy, the total energy in a system must be conserved. the total energy of the system is given by the sum of kinetic (k) and potential (u) energy:

e = k + u

the total energy is e=675 j, and this does not change.

initially, the kinetic energy is k=296 j, so the potential energy is

at the end, the kinetic energy is k=432 j, so the potential energy is

so, we see that the potential energy has decreased from 379 j to 243 j.