George is trying to move a heavy bookshelf across the classroom. He pushes on the bookshelf with a force of 57 N to the right. Friction is resisting his movement with a force of 78 N. The bookshelf
does not move. A friend comes to help George. The friend pushes the bookshelf in the same
direction as George with a force of 25 N. What will happen to the bookshelf?
The bookshelf will move to the left with a force of 25 N
The bookshelf will not move.
The bookshelf will move to the right with a force of 82 N
The bookshelf will move to the right with a force of 4 N.

3 hours because it is a decent distance.

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of carbon is as shown here in the image.

c) should be the answer.

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.