Liz and Justin both look for the luster of the same mineral. Liz examines the samples under the reading light in her bedroom, while Justin takes his sample and a flashlight into a dark room. What statement best explains why the two got different results? None of Liz's samples had luster. Liz's light was too bright to see luster. They used different procedures to test for luster. Justin wore glasses that helped him see more details.

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.