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  1. First write the force equation For the first 500m F=mg-k1v, take downward as positive After the first 500m F=mg-k2v As F=ma, a= dv/dt, we have mdv/dt=mg-k1v dv/dt=g-(k1/m)v Let v=Ae^(-bt)f(t), where f(t) is a function of t...

  2. ...gt;>"1.1=4(1.2)入/1"來計個wavelength??(因為有180 phase change,so min. order =n),同埋...佢果到講fifth order ..點解個n佢代4??? x = nλD/a 這...

  3. In order to form a final image at infinity, the image formed by the objective must be at...

  4. In order to move a cork floating on water, a student proposes two methods...

  5. ...can be reduced. The disadvantage is: The second order spectrum is wider than the first order spectrum, in which the center...

  6. In order to heat up the water from 20 C to 25 C in an indoor swimming pool...

  7. In order to form a constructive interference, the path difference between waves from the two...

  8. ... is larger (nearly double) than that of the first order , the % of reading error is smaller. Disadvantage...

  9. ...1/605.78x10^-9 wavelengths = 1, 650,764 wavelengths i.e. of order of million. You could refer to the following web-page http://en.wikipedia...

  10. NO as air is a fluid......the convection of air would bring the heat from your body quicky.air is a poor insulator...and goose can trap the air ,in order to prevent convection. therefore.. wearing clothers is better..

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