Calculate the light intensity 1.45 m from a light bulb that radiates 100 W equally in all directions
A) 3.78 W/m2
B) 4.36 W/m2
C) 47.6 W/m2
D) 54.7 W/m2
A
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When we speak of the large-scale structure of the universe, we mean
A) the overall arrangement of galaxies, clusters of galaxies, and superclusters in the universe. B) the structure of any large galaxy. C) the structure of any individual cluster of galaxies. D) the overall shape of the observable universe.
The most numerous life on Earth is
A) insects B) plants C) human beings D) microbes
A truck moves 80.0 m east, then moves 140.0 m west, and finally moves east again a distance of 80.0 m. If east is chosen as the positive direction, what is the truck's resultant displacement?
a. 20.0 m b. –20.0 m c. 300.0 m d. –300.0 m e. 140.0 m
A coin has been dropped inadvertently into a bucket full of cleaning fluid (n=1.13). The bottom of the bucket is 15cm beneath the top – how far beneath the surface does the washer therefore APPEAR to be?
A. 17.0cm B. 13.3cm C. More information is needed D. 7.5cm