With the information from exercise 8.25, you can calculate the average age of the ocean floor. first, find the total area of the ocean floor (equal to about 60% of the surface area of earth). then compare this with the area created (or destroyed) each year. the average lifetime is the ratio of these numbers: the total area of ocean crust compared to the amount created (or destroyed) each year.

Two carts, one of mass 2m and one of mass m, approach each other with the same speed, v. when the carts collide, they hook together. assume that positive momentum is to the right. which graph best represents the momentum of both carts over time, before and after the collision?

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.

The ability to make things happen is also called a. heat b. force c. matter d. energy