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Iridescence is the phenomenon that gives shining colours to the feathers of peacocks, hummingbirds, Morpho butterflies, mother-of-pearl in abalone shells and some flies. Iridescent colours change as you turn an object. The colours are not due to dyes, but rather are produced by a wide variety of intricate structures in di erent species. These structures were all unknown until the invention of the electron microscope. Explain why light microscopes cannot reveal them.
A converging lens of focal lenght 0.184 m forms a virtualimage of an object. What is the distancebetween the object and the lens
A wooden dowel (cylinder) has a diameter of 2.20 cm. Determine the density of the dowel
The proper length of one spaceship is three times that of another. The two spaceships are traveling in the same direction, determine the speed of the faster spaceship
An astronaut stands on the steps of her spaceship that is resting on the surface of planet x and drops a rock from a height of 4.5 metres. The rock hits the surface in 0.83 s. Determine the magnitude of the acceleration due to gravity on the surfa..
Water is pumped steadily out of a flooded basement at a speedof 5.5 m/s through a uniform hose of radius 1.1 cm. What is the power of the pump
Red light of wavelength 673.0 nm produces photoelectrons from a certain photoemissive material. Green light of wavelength 515.0 nm produces photoelectrons from the same material with 1.50 times the maximum kinetic energy. What is the material's work ..
A rifle with a mass of 1.76 kg fires a bullet with a mass of 5 g (0.005 kg). The bullet moves with a muzzle velocity of 401 m/s after the rifle is fired. what is the recoil velocity of the rifle
the galactic magnetic field in some region of the interstellar space has a magnitude of 1.00 x 10-9 t. a particle of
Oasis B is located 25 km east from oasis A. A camel starts from oasis A and travels 19.6 km in the direction 14.7 degrees south of east. Then it walks 8 km directly to the north. How far is the camel from oasis B?
In civil aviation, a “standard turn” for level flight of a propeller-driven airplane is one in which the airplane makes acomplete circular turn in 2 min. If the plane’s speed is 151m/s, what is the radius of the circle?
A suitcase falls out of an airplane which is 400 meters above the ground. What is the time it takes for the suitcase to reach the ground
Four identical springs support equally tghe weight of a 1300 kg car. the car driver goes over a speed bump, find the oscillation period
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