Current is the opposition to the flow of charge
a. True
b. False
Indicate whether the statement is true or false
False
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A rock is thrown at a window that is located 18.0 m above the ground. The rock is thrown at an angle of 40.0° above horizontal. The rock is released from a height of 2.00 m above the ground with a speed of 30.0 m/s
If the rock strikes the window on its upward trajectory, from what horizontal distance from the window was it released? A) 53.2 m B) 48.7 m C) 71.6 m D) 29.8 m E) 27.3 m
During each cycle, the compressor in a certain ideal Carnot refrigerator performs 480 J of work to remove 150 J of heat from the interior of the refrigerator. How much heat do the coils behind the refrigerator discharge into the kitchen each cycle?
A) 110 J B) 150 J C) 330 J D) 480 J E) 630 J
Barbara travels 20. km Northward, then travels 40. km Eastward, then continues for 50. km in a Southward direction. What displacement will now take her back to her initial position?
A) 30. km Westward + 40. km Northward B) 50. km Northwest C) 40. km Westward + 30. km Northward D) 30. km Northward + 30. km Westward E) 40. km Eastward + 30. km Southward
Answer the following statement(s) true (T) or false (F)
1. Two blinking warning lights are 3000 m apart along a railroad track. Suppose that in the ground frame the west light blinks (event W ) 5 ?s before the east light blinks (event E). Now imagine that both lights are observed by a passenger on the train who passes the west light just as it blinks. It is possible for the train to be moving fast enough that the two blinks are observed (not necessarily seen) by the passenger to be simultaneous
2. Suppose an explosion occurs at x = 0 in the Home Frame (event A). Light from the explosion is detected by a detector at position x = –100 ns (event B) and by a detector at position x = +50 ns (event C). Events B and C are causally connected
3. If the space time interval between two events is time like, then the temporal order of the two events is the same in every inertial reference frame.
4. If the space time interval between two events A and B is spacelike and event A occurs before event B in some Home Frame, then it is always possible to find an Other Frame where the events occur in the other order
5. An unidentified spaceship cruises past Outpost 11, a space station floating in deep space, at a speed of 
, without acknowledging requests for identification. Ten seconds after the ship passes (according to Outpost 11 clocks), Outpost 11 sends a message to the departing ship, warning that it will commence firing if the ship does not respond. Fifteen seconds after that, Outpost 11 sensors indicate that the ship has raised its shields. This is clearly a response to the warning