Roland writes a story in which boaters become stranded on a sandy island. in the story, they set about collecting materials to create semiconductors to repair computer components in their radio. which problem is likely to be the most difficult for roland’s characters to overcome? a) there are no semiconductor elements on the island. b) any substances they find are too impure. c) they lack materials to make a p-type semiconductor. d) no conductors are available to connect the components.

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.

In which of the following would the particles move most rapidly? a. ice at -20 °c b. water at 20 °c c. steam at 110 °c d. boiling water e. ice at 0 °c

Heterogeneous mixture with larger particles that never settle is