The distance from earth surface to moon surface is 3.8x10^5 km. Calculate areal spread and angular spread for a laser of wavelength 632.8 nm and aperture 0.5 mm when it reaches moon.
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Suppose i am hanging on the gym bar. The force on the bar is only my weight other than its own weight. Now if I try to pull up, as people do in gym, will the force on the bar increases? Since i am pulling up my weight, will the weight or force on the bar doubles?How can we add comments to the changes made?
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