Virtual image created by the magnifying glass
A magnifying glass creates a virtual image of the observed object. Explain how it is possible, that humans can see the virtual images. The virtual image created by the magnifying glass is one example of such images.
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A piston cylinder system stores 15 kg of water that is initially at 120 degrees Celsius, with 0.25 quality. A two step process occurs, such that the final state has a pressure of 300 KPa.
In order to improve sharpness of pictures, photographers sometimes decrease lens's aperture (i.e. cover part of the lens). Explain why this procedure leads to a sharper image.
A fenced enclosure consists of a rectangle of length L and width 2R, and a semicircle of radius R, as shown in Figure P20. The enclosure is to be built to have an area A of 1600 ft^2. The cost of the fence is $40/ft for the curved portion and $30/
To test the effectiveness of a new drug designed to relieve pain, 250 patients were randomly selected and divided into two equal groups. One group of 125 patients was given a pill containing the drug while the other group of 125 was given a placeb
Oil "A" has a viscosity of 80Cst at 40C and 8Cst at 100C. Oil "B" has a viscosity of 90Cst at 40C and 15Cst at 100C. Which oil has the higher viscosity index?
Assuming all conditions are met, test the claim that there is a difference in mean assembly time for each machine using a 3% level of significance. Use the P-value approach.
A cylindrical specimen of some metal alloy having an elastic modulus of 108 GPa and an original cross-sectional diameter of 3.9 mm will experience only elastic deformation when a tensile load of 1690 N is applied.
How much work is done to bring this wheel from rest to a speed of 120 rpm in a time interval of 34.2 s?
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