Crates A and B sit at rest side by side on a frictionless horizontal surface. They have masses mA and mB, respectively. When a horizontal force F S is applied to crate A, the two crates move off to the right. (a) Draw clearly labeled free-body diagrams for crate A and for crate B. Indicate which pairs of forces, if any, are third-law actionreaction pairs. (b) If the magnitude of F S is less than the total weight of the two crates, will it cause the crates to move? Explain
Goals • To understand capacitors and calculate capacitance • To analyze networks of capacitors • To calculate the energy stored in a capacitor • To examine dielectrics and how they affect capacitance Introduction • How does a camera’s flash unit store energy • Capacitors are devices that store electric potential energy. • The energy of a capacitor is actually stored in the electric field. Capacitors and capacitance • Capacitors are devices that store electric potential energy. • The energy of a capacitor is actually stored in the electric field. • Any two conductors separated by an insulator form a capacitor • The definition of capacitance is C = Q/V . ab Parallel-plate capacitor • A parallel-plate ca
