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A 10cm-diameter disk emits light uniformly from its surface. 20rm cm from this disk, along its axis, is an 8.0cm-diameter opaque black disk; the faces of the two disks are parallel. 20cm beyond the black disk is a white viewing screen. The lighted disk illuminates the screen, but there's a shadow in the center due to the black disk. What is the diameter of the completely dark part of this shadow?
ow does this change in amplitude affect the wave's frequency.
A homemade capacitor is assembled by placing two 10in pie pans 6cm apart, Estimate the electric field halfway between the plates
A blow-dryer and a vacuum cleaner each operate with a voltage of 120 V. The current rating of the blow-dryer is 12 A, find the power consumed by the vacuum cleaner
A thin, horizontal copper rod is 1.10 m long and has a mass of 203 g. What is the minimum current in the rod
A certain lens focuses light from an object 1.25maway as an image 41.8cm on the other side of the lens. What type of lens is it
Two objects each have a positive charge. The total charge on both objects is 390 µC. When the objects are placed a distance of 1.20 m apart, each exerts an electrostatic force of 21.3 N on the other. What is the charge on each object? (Round the a..
How does the frequency of harmonic motion change if we take a spring of seven times the modulus, increases or decreases by a factor of how much
A 130-g baseball, moving along the x-axis with speed 29.0 m/s strikes a fence at a 45 degree angle and rebounds along the y-axis with unchanged speed. Give x and y components of its change in momentum.
An ideal heat engine absorbs 81.2 kJ of heat and exhausts 66.1 kJ of heat in each cycle, How much work is done in a cycle
What is its velocity when it reaches the maximum height.
You push on the chair with a force of = 35.0 directed at an angle of 43.0 below the horizontal and the chair slides along the floor.Using Newton's laws, compute the magnitude of the normal force that the floor exerts on the chair.
A drop of water on a countertop reflects light from a flower held 3.10 cm directly above it. What is the focal length of the water drop
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