Meters: In order to construct a voltmeter from a galvanometer, one normally would
A. use a very small shunt resistor.
B. use a very large shunt resistor.
C. use a very small series resistor.
D. use a very large series resistor.
Answer: D
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Consider two blinking warning lights 3000 m apart along a railroad track. These lights flash simultaneously in the ground frame. Let W be the event of the west light blinking, and let E be the event of the east light blinking. A train moves eastward along the track at a relativistic speed ?. Suppose an observer in the train passes the west light just as event W happens. By carefully measuring when the light from event E arrives and calculating the distance between the two lights (by observing how long it takes to travel between the lights at the known speed ?), the observer is able to infer when event E actually happened in the train frame. The observer concludes that
A. Event W happened before event E in the train frame. B. Events W and E were simultaneous in the train frame. C. Event E happened before event W in the train frame. D. One cannot determine unambiguously which event occurs first in the train frame.
In people who are nearsighted the lens in their eye focuses the image in front of the retina. Do nearsighted people need glasses with converging lenses or diverging lenses?
A. converging B. diverging C. depends on the person
Based on the given right ascensions and declinations, which of the following stars appears nearest to the south celestial pole?
A) Spica: RA = 13hr 25m, dec = -11°09' B) Deneb: RA = 20hr 41m, dec = +45°16' C) Sirius: RA = 6hr 45m, dec = -16°42' D) Alpha Centauri: RA = 14hr 40m, dec = -60°50' E) Vega: RA = 18hr 37m, dec = +38°47'
Sunspots usually come in pairs of north and south magnetic poles
Indicate whether the statement is true or false