1. At ignition ( t o ), explosive fuel combustion carries the rocket from its stationary position near the space outpost by producing a ~steady thrust F over the t seconds of the brief burn. t o t o +t Select the best graphical representation of the ship’s speed: t o t o +t

2. At time t = t o seconds, when the capacitor is fully charged, the switch is toggled as shown. Select the graph best representing the charge, Q, remaining on the capacitor. toto toto toto toto toto toto

3. A simple circuit consists of a resistor R, a capacitor C charged to a potential V, and a switch that is initially open but then closed. The moment the switch is closed, the current in the circuit is V / R 1) V / R zero 2) zero need more information 3) need more information

4. A simple circuit consists of a resistor R, a capacitor C charged to a potential V, and a switch that is initially open but then closed. The moment the switch is closed, the current in the circuit is V / R 1) V / R zero 2) zero need more information 3) need more information A long time after the switch is closed, the current in the circuit is V / R 1) V / R zero 2) zero need more information 3) need more information

5. Three different capacitors are charged up and then allowed to discharge through the same resistor. The voltage versus time across each capacitor during discharge is shown below. Which capacitor has the largest capacitance? 1) A 2) B 3) C 4)all the same V t A B C

6. Three different capacitors are charged up and then allowed to discharge through the same resistor. The voltage versus time across each capacitor during discharge is shown below. Which capacitor has the largest capacitance? 1) A 2) B 3) C 4)all the same V t A B C Since the voltage falls 63% of the way to 0 V in time t =  Slower fall off means greater  Since  = RC  C =  / R Greater   greater C

7. In the circuits below, all EMF s are the same, all resistors are the same and all capacitors are the same. In which of the circuits will the capacitor charge up the fastest? 1) A 2) B 3) C 4) all the same

8. In the circuits below, all EMF s are the same, all resistors are the same and all capacitors are the same. In which of the circuits will the capacitor charge up the fastest? 1) A 2) B 3) C 4) all the same In which circuits will the capacitor have the greatest charge? 1) A 2) B 3) C 4) all the same

9. In the circuits below, all EMF s are the same, all resistors are the same and all capacitors are the same. In which of the circuits will the capacitor charge up the fastest? 1) A 2) B 3) C 4) all the same In which circuits will the capacitor have the greatest charge? 1) A 2) B 3) C 4) all the same Q = CV When capacitor charged, I = 0, so  V across resistor = 0 Loop rule says V across capacitor is  for each capacitor  = RC Equivalent R smallest in circuit 1