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The colors of peacocks and hummingbirds are the result not of pigments but of ridges in the surface layers of their feathers. By what physical principle do these ridges produce colors?
An AC generator supplies 15 amps at 440V to a 50,000V power line through a step-up transformer. how much money would the energy supplier save per month if electricity costs $0.12/kWh by stepping up the voltage
a two 69 g ice cubes are dropped into 234 g of water in a thermally insulated container. if the water is initially at
An air-filled parallel-plate capacitor has plates of area 2.80 cm2 separated by 3.00 mm. The capacitor is connected to a 18.0 V battery. What is the charge on the capacitor
What speed would Michelson have computed for Earth's motion through the ether had the experiment seen a shift of one fringe
A steel ball is dropped from a building's roof and passes a window, taking 0.13 s to fall from the top to the bottom of the window, a distance of 1.20 m. How tall is the building
a metal surface has a photoelectric cut-off wavelength of 325.6 nm. it is illuminated with light of 259.8nm. what is
A man weighing 720 N lies on a bed of nails. Calculate the pressure exerted on the skin by an acupuncture needle of radius 0.100 mm applied with a force of 5.20 N
two objects m1=5.10 kg and m2=3.25 kg connected by light spring passing over a light frictionless pulley. determine the speed of each object when the two pass each other
A film of soapy water (n = 1.33) on top of a sheet of Plexiglas has a thickness of 206 nm. What wavelength is most strongly reflected if it is illuminated perpendicular to its surface? (This is the apparent color of the soapy film.)
Consider the system of capacitors shown in the figure below (C1= 2.00 uF, C2= 3.00 uF). Find the total energy stored by the group
An alpha particle (m = 6.7 ´ 10-27 kg, q = +3.2 ´ 10-19 C) has a speed of 20 km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle throughout this motion. Find out an electric potential difference V..
A heating element of resistance (at its operating temperature) 209ohms is connected to a battery of emf 120V and unknown internal resistance r. What must be the total (combined equivalent) resistance for the current
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