A set of pulleys is used to lift a piano weighing 2,155 newtons. The piano is lifted 22.6meters in 103 seconds. How much power was used to lift the piano? A.
5.02 x 10^6 W

B.
4.63 x 10^3 W

C.
9.82 x10^3 W

D.
4.73 x 10^2 W

catya your not at all which answer i've seen you do this on another question!

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.