The direction of the force on a current carrying wire located in an external magnetic field is which of the following?
a. perpendicular to the field
c. Both choices A and B are valid. b. perpendicular to the current
d. None of the above are valid.
C
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Which of the following combinations of circuit components can be used to make a tuner for a radio, to select the desired frequency?
a. fixed inductor, variable resistor b. fixed resistor, variable inductor c. fixed inductor, variable capacitor d. fixed capacitor, variable resistor
If you were caught in freezing weather with only a candle for warmth, you would be warmer in
A) an igloo. B) a tent. C) a wooden house.
Astronauts in a space shuttle that orbits the Earth are in a state of "free fall" that makes them appear to be weightless. If an astronaut brings a helium balloon to a pressurized room of a space shuttle while it is in orbit, what would the helium balloon do?
1.It would float to the top of the cabin. 2.It would sink slowly to the bottom of the cabin. 3.It would remain wherever it is placed. 4.It would remain at whatever height it is placed, but it would move horizontally to one side of the cabin.
What spectacular development in organisms marks the beginning of the Paleozoic era?
What will be an ideal response?