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Fireflies emit flashes of light to communicate, directly converting chemical energy into the energy of visible-light photons. A firefly emits a 0.14-s-long pulse of light with an average wavelength of 600nm . During the flash, the emitted power is 40uW.Assume that all photons have the average wavelength. How many photons does the firefly emit during each flash?
What is the approximate mass of an object whose weight equals the force in part (b).
A dentist wants a small mirror that, when 3.00 cm from a tooth, will produce a 4.5X upright image. What must its radius of curvature be
Suppose you are at the earth's equator and observe a satellite passing directly overhead and moving from west to east in the sky. How far above the earth's surface is the satellite's orbit
Two children carry a lightweight 2.4m -long horizontal pole with a water bucket hanging from it. How far is the bucket from the older child
A 990 g block oscillates on the end of a spring whose force constant is k = 66 N/m. What is the fractional decrease in amplitude per cycle
Electromagnetic waves propagate through what? What is oscillating? What determines the velocity c in free space
A 4.80-m clothesline is hung between two poles that are 4.76 m apart
An experimentalist wishes to probe the nucleus which can be approximated as a hard sphere having a radius of 10^-13 cm. How large must the probe beam intesity be if the target consists of 10^10 nuclei
question1a cube of ice is taken from freezer at -8.3degc and placed in a 100 g aluminium calorimeter filled with 289 g
An object with a mass of 5.10 kg is attached to the free end of the lightstring wrapped around a reel radius R=0.25 m and mass 3kg the reel is a solid disk, free to rotate in a vertical plane about the horizontal axis paasing through its center th..
What is the internal resistance of a 12.0-V car battery whose terminal voltage drops to 9.5V when the starter motor draws 77A
find out the escape speed from Jupiter's moon Callisto
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