Log question The diagram shows a log being pulled up an earth slope from X to y. How much work is done against friction, the answer I get is not among the 4 choices.. also the part messed up by the scanner says 1000N force due to friction The diagram shows a boy doing homework. He has a difficulty reading his book under the small light bulb. Draw a ray diagram to show the shadow produced by his head on the table. What difference would it make to the shadow if the light bulb were replaced by a long fluroescent bulb? Draw a diagram to illustrate this case. my attempt... the darker part is the umbra and the strokes are the penumbra does that drawing make any sense? Please respond.