Some two-phase metal alloy is known to be composed of α and β phases; mass fractions of these phases are 0.77 and 0.23, respectively. room-temperature electrical resistivity and density data for these phases are tabulated below. using this information, calculate the electrical resistivity (in ω-m) of the alloy at room temperature.

If steel is more dense that lake water, why can a boat float

Anybody wanna ? (picture included? )

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.