A 40.0-kg boy, riding a 2.50-kg skateboard at a velocity of 15.30 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boys velocity relative to the sidewalk is 6.00 m/s, 9.508 above the horizontal. Ignore any friction between the skateboard and the sidewalk. What is the skateboards velocity relative to the sidewalk at this instant? Be sure to include the correct algebraic sign with your answer.
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
