Which semiconductors are used in each of the three parts of a pnp transistor?
the base and the emitter are p-type, and the collector is n-type.
the emitter and the collector are n-type, and the base is p-type.
the base and the collector are p-type, and the emitter is n-type.
the collector and the emitter are p-type, and the base is n-type.

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

Frank just graduated from eighth grade. assuming exactly four years from now he will graduate from high school how many seconds does he have until his high school graduation

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.