3. A 120 g piece of aluminum (Caluminum =9 J/gºC) is at 70°C. It is placed in a 100 g beaker of water at 15°C. The final temperature of the mixture is 26.3°C.
a. What was the thermal energy gained by the water?

You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a × b = 98k. what is the y-component of vector b?

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.

How can you measure the amplitude of a longitudinal wave?