A bird sitting on a bare high voltage wire is not electrocuted because
a. of the high resistance of its body
b. there is no electrical potential difference across its body
c. its body is at a low electrical potential compared to the wire
d. the high voltage across its feet produced a small current
b
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Interference: Two beams of coherent light start out at the same point in phase and travel different paths to arrive at point P. If the maximum destructive interference is to occur at point P, the two beams must travel paths that differ by
A. a whole number of wavelengths. B. an odd number of half-wavelengths. C. a whole number of half-wavelengths.
According to current evidence, Pluto is best described as
A) a large member of the Kuiper belt. B) a terrestrial planet that is surprisingly far from the Sun. C) a small jovian planet. D) an escaped moon of Jupiter or Saturn.
An unknown resistor is wired in series and an ammeter and a voltmeter are placed in parallel across both the resistor and the ammeter. This network is then placed across a battery
If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained A) is the true resistance. B) is greater than the true resistance. C) is less than the true resistance. D) could be anything. It depends on other factors.
A block of wood has specific gravity 0.80 . When placed in water, what percent of the volume of the wood is above the surface?
a. 0, the block sinks. b. 20% c. 80% d. 50% e. 100%